WO2021228259A1

WO2021228259A1 - Light-emitting diode lamp illumination system, and dimmer and light-emitting diode lamp thereof

Info

Publication number: WO2021228259A1
Application number: PCT/CN2021/094123
Authority: WO
Inventors: 熊爱明; 周林; 陈俊仁
Original assignee: 嘉兴山蒲照明电器有限公司
Priority date: 2020-05-15
Filing date: 2021-05-17
Publication date: 2021-11-18
Also published as: CN216531846U

Abstract

Provided in the disclosure are an LED lamp illumination system, and a dimmer and LED lamp thereof. The dimmer is used to adjust an LED lamp, and said system is characterized in that the LED lamp supplies power by means of the dimmer. The dimmer comprises: a dimming signal generation module, which receives a dimming instruction and is used for outputting a dimming signal on the basis of the received dimming instruction; and a signal synthesis module, which is coupled to the dimming signal generation module, is electrically connected to the output end of the dimmer, and is used for adjusting, on the basis of the dimming signal, a power supply signal generated by the dimmer so as to output a modulation power source synthesized with the dimming instruction. An alternating-current component in a waveform of the modulation power source is used to describe the dimming instruction.

Description

Light-emitting diode lamp lighting system and its dimmer and light-emitting diode lamp

Technical field

The present disclosure relates to the field of lighting appliances, in particular to an LED lamp lighting system and its dimmer and LED lamp.

Background technique

LED lighting technology is rapidly developing to replace traditional incandescent lamps and fluorescent lamps. Compared with fluorescent lamps filled with inert gas and mercury, LED straight tube lamps do not need to be filled with mercury. Therefore, in various home or workplace lighting systems dominated by lighting options such as traditional fluorescent bulbs and tubes, various LED lamps, such as LED straight tube lamps, LED bulbs, LED filament lamps, and high-power LED lights or integrated LED lights, etc., have gradually become highly anticipated lighting options without accident. The advantages of LED lights include improved durability and lifespan and lower energy consumption. Therefore, after considering all factors, LED lights will be the best lighting option.

In general LED lighting solutions, how to achieve dimming control is a widely discussed topic. In the existing dimming technology, there is a dimming method that adjusts the effective value of the input voltage in a phase-cutting/chopping manner, thereby realizing the dimming effect. However, since this dimming control method significantly affects the integrity of the voltage waveform, it will inevitably cause various problems such as reduced luminous efficiency and flicker of the LED lamp. Another way is to send the dimming signal to the driving circuit in the lamp through an independent signal line, so that the driving circuit adjusts the output voltage/current according to the received dimming signal, and then controls the brightness of the LED lamp. However, in the application scenario of multi-lamp setting, because each LED lamp needs to pull out the signal line to receive the dimming signal, the complexity of the LED lamp layout will be greatly increased, which is not conducive to the multi-lamp dimming control. accomplish.

Traditional incandescent lamps can adjust the brightness of the lamp through a silicon controlled rectifier (TRIAC), but when the thyristor is used in an LED lamp, although there is no need to connect a dimming signal line, due to the non-linear characteristics of the LED, under low brightness , There will be the problem of LED lights flickering, and the efficiency of LED lights adjusted by thyristors is poor.

There are many types of LED lights on the market, and current thyristor dimmers cannot be 100% compatible with LED lights.

The DLT (Digital Load Side Transmission) digital wired dimming solution based on the power line carrier communication protocol bypasses the thyristor from the physical mechanism, thereby solving the compatibility problem of LED lamps and dimmer switches (or dimmers). The compatibility between LED DLT dimming lamps and DLT dimming switches of different brands can reach 100%, and there is no flicker at all, dimming is smooth and noise-free, and the minimum dimming depth can be 1%, which is cost-effective and thyristor. The plan is completely comparable, and the market development potential is worth looking forward to.

Although DLT has great market potential, since the disclosure of the DLT agreement, due to the difficulty in the development of DLT dimming lamps, no mature solutions have appeared on the market. There are some resistances to the real large-scale promotion and application of DLT dimming technology.

Ordinary circuit sensors (such as human body sensors, light sensors, etc.) generally use resistance-capacitance step-down methods for power supply. The entire circuit sensor presents a capacitive impedance, and the capacitive impedance will interfere with the power signal and affect the signal transmission on the power line, eventually causing the DLT dimming system to fail to work normally. In addition, the resistance-capacitance step-down power supply circuit is prone to failure when used in a wide-voltage power grid environment. Therefore, the circuit sensor needs to be improved to be compatible with the DLT dimming system.

In addition, when the lighting system contains multiple lamps and one or more of the lamps in the system fails and the entire lighting system is paralyzed, it is impossible to perform efficient maintenance by simply replacing the lamps.

In addition, there is a kind of dimmer that can only add a signal line to complete the dimming in addition to the power line. This kind of dimmer adds a switch to the signal line and uses the switch signal for two-stage dimming. The cost is low, but it cannot Realize continuous dimming.

Among the existing wireless signal control technologies, infrared technology is relatively mature and low in cost, and can be used as a wireless control solution.

However, because of the directional transmission of infrared rays, and the signal attenuation as the distance increases, when the lamp cluster needs to be controlled, some lamps cannot receive the control signal normally and cannot be controlled synchronously. When there is an obstacle between the remote control and the lamp, the lamp cannot be controlled normally.

In view of the above problems, the present disclosure and its embodiments are presented below.

Summary of the invention

This summary describes many embodiments of the "present disclosure". However, the term "this disclosure" is only used to describe certain embodiments disclosed in this specification (regardless of whether they are in the claims), rather than a complete description of all possible embodiments. Certain embodiments described below as various features or aspects of the "present disclosure" can be combined in different ways to form an LED straight tube lamp or a part thereof.

An embodiment of the present disclosure provides an LED lamp lighting system, which is characterized by comprising: a dimmer whose input terminal is electrically connected to a first external power input terminal for receiving an external power signal and generating a dimming signal; and an LED lamp , Electrically connected to the first output terminal, the second output terminal and the second external power input terminal of the dimmer for receiving the dimming signal and adjusting the brightness or color temperature of the LED lamp.

In an embodiment of the present disclosure, the LED lamp includes: a demodulation module, electrically connected to the dimmer, for receiving the dimming signal and converting the dimming signal into a dimming control signal; an LED driving module , Electrically connected to the external power supply and the demodulation module, used to perform power conversion on the external power signal to generate a driving power supply and adjust the driving power supply according to the received dimming control signal; and the LED module, electrically connected to all The LED driving module is used to receive the driving power to light up.

In an embodiment of the present disclosure, the dimmer includes a first switch and a second switch, the first pin of the first switch is electrically connected to the first external power input terminal, and the second pin of the first switch is electrically connected The first pin of the second switch is electrically connected to the second pin of the first switch, and the second lead of the second switch is electrically connected to the LED drive module. The pin is electrically connected to the demodulation module for generating a dimming signal.

In an embodiment of the present disclosure, the first switch is a normally open switch; the second switch is an inching switch and is set to be normally open.

In an embodiment of the present disclosure, the dimmer includes a first switch, a third switch, and a fourth switch. The first pin of the first switch is electrically connected to the first external power input terminal. The first pin of the third switch and the first pin of the fourth switch are electrically connected and electrically connected to the second pin of the first switch, and the second pin of the third switch is electrically connected to The LED drive module and the demodulation module, and the second pin of the fourth switch is electrically connected to the LED drive module and the demodulation module.

In an embodiment of the present disclosure, the third switch and the fourth switch are inching switches and are set to be normally closed.

In an embodiment of the present disclosure, the third switch and the fourth switch are configured to be unable to be turned off at the same time.

An embodiment of the present disclosure provides an LED lamp lighting system, which is characterized by comprising: a dimmer, the input terminal of which is electrically connected to the first external power input terminal for converting the received external power signal into A dimming power signal, the dimming power signal contains dimming information; and an LED lamp, which is electrically connected to the output terminal of the dimmer and the second external power input terminal, and is used to respond to the received dimming Light power signal for dimming.

In an embodiment of the present disclosure, the external power signal is a commercial AC signal, and the dimmer performs phase-cut processing on the external power signal according to the dimming instruction to generate the dimming power signal.

In an embodiment of the present disclosure, the tangent angle of the phase-cutting process is less than 90 degrees, and the size of the tangent angle corresponds to the brightness of the LED lamp.

In an embodiment of the present disclosure, when the phase cut angle is a certain value, when the amplitude of the external power signal changes, the brightness of the LED lamp does not change.

In an embodiment of the present disclosure, the dimmer includes: a dimming signal generating module for generating a dimming signal according to the received dimming command; a zero-crossing detection module electrically connected to the first external power source The input terminal and the second external power input terminal are used to detect the zero-crossing point of the external power signal and generate a zero-crossing signal; the data modulation module is electrically connected to the first external power input terminal for matching The external power signal is rectified and the dimming signal is loaded on the external power signal to generate the dimming power signal; a filter circuit is electrically connected to the data modulation module for rectifying the received rectified signal Filtering to generate a filtered signal; a power supply module electrically connected to the filter circuit for power conversion of the filtered signal to generate a power supply signal for the dimmer; and a control module electrically connected to the filter circuit The zero detection module is configured to receive the zero-crossing signal, start data modulation at a specific time after the zero-crossing, and load the dimming signal on the external power signal to generate the dimming power signal.

In an embodiment of the present disclosure, the dimming signal generation module includes a wireless remote control and a signal receiving module, the wireless remote control is used to convert the dimming command into a wireless dimming signal, and the signal receiver module is used to The wireless dimming signal is converted into the dimming signal.

In an embodiment of the disclosure, the dimming signal generating module includes a light sensing module, and the light sensing module generates the dimming signal according to the intensity of ambient light.

In an embodiment of the present disclosure, the data modulation module includes a first diode, a second diode, a first Zener diode, a first transistor, a second transistor, and a third transistor; the anode of the first diode Is electrically connected to the external power input terminal and the first pin of the first transistor, and its cathode is electrically connected to the cathode of the second diode and the cathode of the first Zener diode; The second pin is electrically connected to the second pin of the second transistor and is electrically connected to the first circuit node, and the third pin is electrically connected to the control module; the first pin of the second transistor The pin is electrically connected to the anode of the second diode and is electrically connected to the output terminal of the dimmer, and the third pin is electrically connected to the control module; the third pin of the third transistor One pin is electrically connected to the anode of the first Zener diode, the second pin is electrically connected to the third pin of the second transistor, and the third pin is electrically connected to the control module .

In an embodiment of the present disclosure, the external power signal is commercial AC power, which is characterized in that, within an AC half-wave (within half an AC cycle), the data modulation module includes three working phases: power supply phase, power Phase and data phase.

In an embodiment of the present disclosure, during the power supply phase, the external power signal provides power for the dimmer, during the power phase, the external power signal provides power for the LED lights, and during the data phase The dimmer loads the dimming signal onto the external power signal to generate the dimming power signal.

In an embodiment of the present disclosure, during the power supply phase, the first transistor and the second transistor are in an off state.

In an embodiment of the present disclosure, during the power phase, the first transistor and the second transistor are in a conducting state.

In an embodiment of the present disclosure, in the data phase, the first transistor and the second transistor work in the amplifying region, and the third transistor is turned on intermittently.

In an embodiment of the present disclosure, the LED lamp lighting system further includes a fault detection module, which is electrically connected to the dimmer, for fault detection by bypassing the dimmer.

In an embodiment of the present disclosure, the fault detection module includes a first switch, and the first switch is electrically connected to the input terminal and the output terminal of the dimmer.

In an embodiment of the present disclosure, the LED lamp lighting system further includes a sensor electrically connected to the dimmer and the LED lamp for changing the circuit state of the sensor based on environmental variables.

In an embodiment of the present disclosure, the environmental variable is the intensity of ambient light, whether a human body or environmental sound is detected, and so on.

In an embodiment of the present disclosure, the sensor includes: a rectifier circuit electrically connected to an external power source for rectifying the received external power signal to generate a rectified signal; a filter circuit electrically connected to the rectifier circuit, Used to filter the rectified signal to generate a filtered signal; a power conversion circuit, electrically connected to the filter circuit, to perform power conversion on the filtered signal to generate a low-voltage DC signal; a switching device, electrical The power supply circuit connected to the LED lamp is connected in series with the LED lamp to switch on and off the power supply circuit; and a sensor control module, which is electrically connected to the power conversion circuit and the switching device, for use The low-voltage direct current signal works, and controls the on-off of the switching device according to environmental variables;

In an embodiment of the present disclosure, the rectifier circuit is a full-bridge rectifier circuit.

In an embodiment of the present disclosure, the filter circuit includes at least one capacitor.

In an embodiment of the present disclosure, the power conversion circuit is a DC step-down power conversion circuit.

In an embodiment of the present disclosure, the switching device is a field effect transistor or a relay.

An embodiment of the disclosure provides an infrared repeater, which is characterized by comprising: an infrared signal receiving module for receiving infrared control signals; an infrared signal amplifying module, electrically connected to the infrared signal receiving module, for The infrared control signal is amplified; and the infrared signal transmitting module is electrically connected to the infrared signal amplifying module for transmitting the amplified infrared control signal.

In an embodiment of the present disclosure, the infrared signal emitting module includes a plurality of infrared emitting components, and the infrared emitting components are arranged in an array.

In an embodiment of the disclosure, the infrared signal receiving module includes a plurality of infrared receiving components, and the infrared emitting components are arranged in an array.

In an embodiment of the present disclosure, the infrared repeater uses a battery or city power for power supply.

In an embodiment of the disclosure, the infrared signal receiving module includes an infrared receiving probe, the first pin of the infrared receiving probe is electrically connected to a power terminal, and the third pin is electrically connected to a common ground terminal; The infrared emission module includes a first infrared light-emitting diode; the infrared amplification module includes a first capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor. The triode, the third triode, and the first field effect transistor, the second pin of the first capacitor is electrically connected to the common ground terminal, the first resistor and the first capacitor are connected in parallel, and the second resistor of the second resistor One pin is electrically connected to the first pin of the first capacitor, the second pin is electrically connected to the first pin of the first transistor, and the second pin of the first transistor is electrically connected to The second pin of the third resistor, the third pin of which is electrically connected to the common ground terminal, the first pin of the third resistor is electrically connected to the power terminal, and the first pin of the second triode The pin is electrically connected to the first pin of the third transistor and is electrically connected to the second pin of the first transistor and the first pin of the fourth resistor, and the second pin of the fourth resistor is electrically connected. The second pin of the second transistor is electrically connected to the power terminal, and the third pin of the second transistor is electrically connected to the second pin of the third transistor. The third pin of the tube is electrically connected to the common ground terminal G, the first pin of the fifth resistor is electrically connected to the third pin of the second transistor, and the second pin is electrically connected to the field The first pin of the first effect transistor, the second pin of the first field effect transistor is electrically connected to the cathode of the first infrared light emitting diode, the third pin is electrically connected to the common ground terminal, and the sixth resistor The first pin is electrically connected to the power supply terminal, and the second pin is electrically connected to the anode of the first infrared light emitting diode.

The embodiment of the present disclosure provides an LED lamp, which is characterized by comprising a driving circuit, an LED module, and a demodulation module. The demodulation module is electrically connected to an external power source for generating an LED lamp according to the dimming information contained in the external power signal. The dimming control signal; the driving circuit is electrically connected to the external power supply and the demodulation module, and is used to perform power conversion on the received external power signal to generate a driving power supply, and adjust the driving according to the dimming control signal Power; The LED module is electrically connected to the drive circuit for receiving the drive power to light up.

In an embodiment of the present disclosure, the external power signal is a DC signal.

In an embodiment of the present disclosure, the LED lamp further includes a rectifier circuit and a filter circuit, the rectifier circuit is electrically connected to an external power source for rectifying the external power signal to generate a rectified signal; the filter circuit is electrically connected The rectifier circuit is used to filter the rectified signal to generate a filtered signal; the filtered signal is used to provide the driving circuit.

In an embodiment of the present disclosure, the driving circuit is a step-down DC conversion circuit.

Description of the drawings

1A, 1B, and 1C are schematic diagrams of functional modules of the LED lighting system according to some embodiments of the present disclosure;

FIG. 1D is a circuit block diagram of a fault detection module according to an embodiment of the disclosure;

1E is a schematic diagram of functional modules of an LED lighting system according to another embodiment of the disclosure;

1F is a schematic diagram of functional modules of an LED lighting system according to another embodiment of the disclosure;

FIG. 2 is a schematic diagram of functional modules of a power adapter according to some embodiments of the present disclosure;

FIG. 3 is a schematic diagram of a circuit structure of a signal adjustment module according to some embodiments of the present disclosure;

4A is a schematic diagram of functional modules of a switching power supply module according to some embodiments of the disclosure;

4B is a schematic diagram of a circuit structure of a power conversion circuit according to some embodiments of the disclosure;

4C is a schematic diagram of the circuit structure of the power factor circuit according to some embodiments of the disclosure;

4D is a schematic diagram of the circuit structure of a power factor correction circuit according to another embodiment of the disclosure;

4E is a schematic diagram of the circuit structure of a power factor correction circuit according to another embodiment of the disclosure;

5A is a schematic diagram of functional modules of a dimmer according to some embodiments of the disclosure;

FIG. 5B is a schematic diagram of the circuit structure of the dimmer according to some embodiments of the disclosure;

5C is a schematic diagram of a circuit structure of a dimmer according to another embodiment of the disclosure;

5D is a schematic diagram of a circuit structure of a dimmer according to another embodiment of the disclosure;

5E is a schematic diagram of a circuit structure of a dimmer according to another embodiment of the disclosure;

5F is a circuit block diagram of a dimmer according to another embodiment of the disclosure;

6A and 6B are schematic diagrams of functional modules of LED lighting devices according to some embodiments of the present disclosure;

6C is a schematic diagram of functional modules of the driving circuit of some embodiments of the disclosure;

FIG. 7A is a schematic diagram of functional modules of a demodulation module according to some embodiments of the disclosure;

7B and 7C are schematic diagrams of the circuit architecture of the LED lighting device according to some embodiments of the disclosure;

FIG. 7D is a schematic diagram of functional modules of the demodulation module according to some embodiments of the present disclosure;

FIG. 7E is a schematic diagram of waveforms of the demodulation module of some embodiments of the present disclosure;

FIG. 7F is a schematic circuit diagram of a demodulation module according to an embodiment of the present disclosure;

7G is a schematic circuit diagram of a demodulation module according to another embodiment of the disclosure;

8A and 8B are schematic diagrams of signal waveforms of dimmers according to some embodiments of the disclosure;

8C is a schematic diagram of dimming waveforms of an LED lighting system disclosed in the present disclosure;

FIG. 8D is a schematic diagram of dimming waveforms according to an embodiment of the present disclosure;

FIG. 8E is a schematic diagram of dimming waveforms according to another embodiment of the present disclosure;

FIG. 8F and FIG. 8G are schematic diagrams of the correspondence between the phase cut angle, the demodulation signal, and the brightness of the LED module in some embodiments of the disclosure;

8H is a schematic diagram of input power waveforms of the LED lighting devices of some embodiments of the disclosure under different grid voltages;

8I is a schematic diagram of a waveform of a dimming power signal of an LED lighting system according to an embodiment of the disclosure;

9A-9D are schematic diagrams of signal waveforms of LED lighting devices according to some embodiments of the disclosure;

10A and 10B are a flowchart of steps of a dimming control method of an LED lighting device according to some embodiments of the present disclosure;

10C and 10D are a flowchart of steps of a dimming control method of an LED lighting system according to some embodiments of the present disclosure;

FIG. 11A is a schematic circuit diagram of a zero-crossing detection module according to an embodiment of the present disclosure;

FIG. 11B is a schematic circuit diagram of a data modulation module according to an embodiment of the disclosure;

12A is a schematic diagram of the circuit structure of a rectifier circuit according to an embodiment of the disclosure;

12B is a schematic diagram of the circuit structure of a rectifier circuit according to another embodiment of the disclosure;

12C is a schematic diagram of the circuit structure of a filter circuit according to an embodiment of the disclosure;

12D is a schematic diagram of the circuit structure of a filter circuit according to another embodiment of the disclosure

12E is a schematic circuit diagram of a dimming signal generating module according to an embodiment of the disclosure;

13A and 13B are schematic diagrams of circuit structures of LED modules according to some embodiments of the disclosure;

14A is a schematic diagram of a circuit structure of a fault detection module according to an embodiment of the disclosure;

14B is a schematic diagram of a circuit structure of a fault detection module according to another embodiment of the disclosure;

15A is a schematic circuit diagram of a dimmer according to an embodiment of the disclosure;

15B is a schematic circuit diagram of a dimmer according to another embodiment of the disclosure;

16A is a schematic diagram of a waveform of a dimming signal according to an embodiment of the disclosure;

16B is a schematic diagram of a waveform of a dimming signal according to another embodiment of the disclosure;

16C is a schematic diagram of a waveform of a dimming signal according to another embodiment of the disclosure;

FIG. 17 is a schematic diagram of a framework of a lighting system according to another embodiment of the present disclosure;

18A is a schematic diagram of a framework of a lighting system according to another embodiment of the present disclosure;

18B is a schematic structural diagram of a lighting system according to another embodiment of the present disclosure;

18C is a schematic diagram of a framework of a lighting system according to another embodiment of the present disclosure;

19A is a schematic diagram of the circuit structure of an infrared repeater according to an embodiment of the disclosure;

19B is a schematic diagram of the circuit structure of an infrared repeater according to an embodiment of the disclosure;

20 is a schematic diagram of working waveforms of an infrared repeater according to an embodiment of the present disclosure;

21 is a schematic diagram of signal coverage of an infrared repeater according to an embodiment of the disclosure;

22A is a schematic diagram of a circuit structure of a sensor according to an embodiment of the disclosure;

22B is a schematic diagram of a circuit structure of a sensor power supply module according to an embodiment of the disclosure;

FIG. 22C is a schematic diagram of an equivalent circuit of the circuit structure shown in FIG. 22B of the present disclosure; and

FIG. 22D is a schematic diagram of a circuit structure of a sensor according to another embodiment of the disclosure.

Detailed ways

This disclosure proposes an LED lighting system, an LED dimmer, an LED lighting device, and a dimming control method to solve the problems mentioned in the background art and the above problems. In order to make the above objectives, features and advantages of the present disclosure more obvious and understandable, specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The following descriptions of the embodiments of the present disclosure are merely examples for illustration, and do not represent all the embodiments of the present disclosure or limit the present disclosure to specific embodiments.

In addition, it should be noted that, in order to clarify the various disclosed features of the present disclosure, this article uses multiple embodiments to describe each embodiment as follows. However, it does not mean that each embodiment can only be implemented separately. Those skilled in the art can collocation and design feasible implementation examples according to requirements, or replace replaceable components/modules in different embodiments according to design requirements. In other words, the implementation mode taught in this case is not limited to the aspects described in the following examples, but also includes substitution, permutation and combination of various embodiments/components/modules where feasible, which is described here first. .

FIG. 1A is a schematic block diagram of an LED lighting system according to some embodiments of the present disclosure. 1A, the LED lighting system 10 of this embodiment includes a dimmer 80 and an LED lighting device 100, where the LED lighting device 100 further includes a power module PM and an LED module LM. In other embodiments, the LED lighting system may also be referred to as an LED lamp lighting system.

In the LED lighting system 10, the input end of the dimmer 80 is electrically connected to the external power grid EP to receive the input power Pin from the external power grid EP. The output end of the dimmer 80 is electrically connected to the LED lighting device 100 through the first connection terminal T1 and the second connection terminal T2 of the LED lighting device 100, so as to provide the modulated power Pin_C after dimming processing to the LED lighting device 100 . In other words, the external power grid EP is electrically connected to the LED lighting device 100 through the dimmer 80 to supply power to the LED lighting device 100 for use. Wherein, the input power source Pin or the modulated power source Pin_C may be an AC power source, and may refer to at least any one of input voltage, input current, and input power. The external power grid EP can be a mains or a ballast. In addition, in the LED lighting system 10, the power supply loop formed between the external power grid EP and the LED lighting device 100 can be defined as a bus.

The LED lighting device 100 may include one or more LED lighting devices 100_1-100_n (represented by n, where n is a positive integer greater than or equal to 1), wherein each LED lighting device 100_1-100_n has a similar or identical configuration. The following uses the LED lighting device 100_1 as a representative to illustrate the electrical connection relationship of the LED lighting device 100 in the LED lighting system 10. The LED lighting device 100_1 receives the modulated power Pin_C from the first connection terminal T1 and the second connection terminal T2, wherein the power module PM generates a driving power Sdrv based on the modulated power Pin_C and provides it to the LED module LM, so that the LED module LM responds to the driving power Sdrv is lit. In an embodiment where there are multiple LED lighting devices 100_1-100_n (ie, n≧2), each LED lighting device 100_1-100_n may be configured in parallel with each other, that is, the first connection terminal T1 of each LED lighting device 100_1-100_n Will be electrically connected together, and the second connection ends T2 of each LED lighting device 100_1-100_n will be electrically connected together. In other embodiments, the driving power Sdrv may also be referred to as a driving signal.

In some embodiments, the LED lighting device 100 may be any type of LED lights driven by AC power, such as LED spotlights, LED downlights, LED bulb lights, LED track lights, LED panel lights, LED ceiling lights, and LED straight lights. This disclosure does not impose restrictions on tube lamps or LED filament lamps. In the embodiment where the LED lighting device 100 is an LED straight tube lamp, the LED lighting device 100 may be a built-in driving type LED straight tube lamp, such as a ballast compatible (Type-A) straight tube lamp or a ballast bypass type. (Type-B) Straight tube lamp.

From the overall operation of the LED lighting system 10, the dimmer 80 will perform dimming processing on the input power Pin according to a dimming command DIM, and generate the processed modulated power Pin_C accordingly. The user can give the corresponding dimming command DIM to the dimmer 80 through a control interface 50. The control interface 50 can be implemented in various forms such as a switch, a knob, a touch panel, or a wireless signal receiver, which is not limited in this disclosure. In addition, depending on the selected dimming mode, the dimming processing may be to change the signal characteristics of the conduction angle, frequency, amplitude, phase or combination of the input power Pin. The dimmer 80 includes at least one controllable electronic component (not shown) that is electrically connected to the bus or can affect the current/voltage of the bus, such as a thyristor, a single-chip microcomputer, and a transistor. The controllable electronic component can adjust the signal characteristics of the input power Pin in response to the dimming command DIM, so that the input power Pin is converted into the adjusted modulated power Pin_C. In the configuration of the LED lighting system 10 of this embodiment, the dimmer 80 can be regarded as adjusting the signal characteristics of the AC input power Pin to generate an AC modulating power supply Pin_C with a dimming signal, that is, the dimmer of this embodiment The modulated power supply Pin_C after dimming processing is composed of at least an AC component and a dimming signal component. Subsequent embodiments will further describe the configuration of the dimmer 80.

When the LED lighting device 100 receives the modulated power Pin_C, on the one hand, the power module PM will further convert the modulated power Pin_C into a stable driving power Sdrv for the LED module LM. On the other hand, the power module PM will be based on different modulations. The signal characteristics of the power supply Pin_C are changed to generate a driving power Sdrv with different voltages (may be called driving voltages), currents (may be called driving currents) and/or pulse widths. After the driving power Sdrv is generated, the LED module LM will be lit and emit light in response to the driving power Sdrv. Among them, the brightness of the LED module LM will be related to the driving voltage, driving current and/or pulse width. The driving voltage and/or driving current will be adjusted based on the signal characteristics of the modulated power supply Pin_C, and the signal of the power supply Pin_C will be modulated. The feature is controlled by the dimming command DIM. In other words, the dimming command DIM is directly related to the luminous brightness of the LED module LM. The operation of the power module PM to convert the modulated power Pin_C into the driving power Sdrv may include, but is not limited to, signal processing such as rectification, filtering, and DC-to-DC conversion. Another subsequent embodiment will further describe this part.

Under the configuration of a plurality of LED lighting devices 100_1-100_n (n≧2), the modulated power Pin_C will be provided to the LED lighting devices 100_1-100_n at the same time, so that the LED lighting devices 100_1-100_n will be lit at the same time. Therefore, in some embodiments, when the dimming command DIM is applied/adjusted, the light-emitting brightness of the LED lighting devices 100_1-100_n will be changed synchronously. Since the LED lighting system 10 realizes dimming control by adjusting the signal characteristics of the input power Pin, there is no need to pull out an independent signal line on each LED lighting device 100_1-100_n to receive the dimming signal, which greatly simplifies Wiring and installation complexity in a multi-lamp control application environment.

FIG. 1B is a schematic block diagram of an LED lighting system according to other embodiments of the present disclosure. This embodiment is a system configuration diagram in which the dimmer is included in a power adapter. 1B, the LED lighting system 20 of this embodiment includes a power adapter PA and an LED lighting device 200. In the LED lighting system 20, the power adapter PA is provided outside the LED lighting device 200 and can be used to convert the AC input power Pin into a power supply signal. The power adapter PA includes a dimmer 80 which can be based on the dimming command DIM Perform dimming processing on the power supply signal converted by the power adapter PA, and generate the processed modulated power Pin_C accordingly. Compared with the embodiment of FIG. 1A, in the configuration of the LED lighting system 20 of this embodiment, the dimmer 80 can be regarded as adjusting the signal characteristics of the rectified input power Pin to generate a dimming signal. The DC modulated power supply Pin_C, that is, the modulated power supply Pin_C after dimming processing in this embodiment at least consists of a DC component and a dimming signal component. Subsequent embodiments will also further describe the configuration of the dimmer 80. In some embodiments, the input power source may also be referred to as an external power source, which has the same meaning, and the present invention is not limited thereto.

Similar to the embodiment of FIG. 1A, the LED lighting device 200 of this embodiment may also include one or more LED lighting devices 200_1-200_n (represented by n, where n is a positive integer greater than or equal to 1), wherein each LED The lighting devices 200_1-200_n have similar or identical configurations, and are similar to the aforementioned LED lighting devices 100_1-100_n. Therefore, regarding the configuration and operation of the power module PM and the LED module LM of each LED lighting device 200_1-200_n, please refer to the foregoing embodiment, and will not be repeated here. It is also mentioned here that, since the modulating power Pin_C provided by the dimmer 80 to the LED lighting device 100 in the embodiment of FIG. 1A is an AC power source, the power adapter PA in the implementation of FIG. The variable power Pin_C is a power supply signal, so the power modules PM in the

LED lighting devices

100 and 200 may have different configurations according to different types of power received. For example, the power module PM in the LED lighting device 100 may include a rectifier circuit, a filter circuit, and a DC-to-DC conversion circuit, etc.; the power module PM in the ED lighting device 200 may only include a filter circuit and a DC-to-DC conversion circuit, It does not include the rectifier circuit.

In some embodiments, the LED lighting device 200 may be any type of LED light driven by a power supply signal, such as an LED spotlight, LED downlight, LED bulb light, LED track light, and LED panel light used with an external power adapter. , LED ceiling lamps, LED straight tube lamps or LED filament lamps, etc. This disclosure does not impose restrictions on this. In the embodiment where the LED lighting device 200 is an LED straight tube lamp, the LED lighting device 200 may be an externally driven (Type-C) LED straight tube lamp.

FIG. 2 is a schematic diagram of functional modules of a power adapter according to some embodiments of the disclosure. Please refer to FIG. 2, in some embodiments, the power adapter PA includes a signal adjustment module 60, a switching power supply module 70 and a dimmer 80.

The signal adjustment module 60 receives the input power Pin, and is used to perform signal adjustments such as rectification and filtering of the AC input power Pin. The switching power supply module 70 is electrically connected to the signal adjustment module 60, and is used to perform power conversion on the signal-adjusted input power Pin to generate and output a stable power supply signal. The dimmer 80 is electrically connected to the switching power supply module 70, and is used to modulate the power supply signal output by the switching power supply module 70 to convert the dimming command DIM into a specific form/signal feature and load the output of the switching power supply module 70 On the power supply signal, the modulated power supply Pin_C after dimming processing is generated. Below, FIGS. 3 to 5B are used to illustrate some configuration embodiments of the modules in the power adapter PA.

FIG. 3 is a schematic diagram of the circuit structure of the signal adjustment module according to some embodiments of the disclosure. Please refer to FIG. 3, in some embodiments, the signal adjustment module 60 includes a rectifier circuit 61 and a first filter circuit 62. The rectifier circuit 61 receives the input power Pin through the rectification input terminal, rectifies the input power Pin, and then outputs the rectified signal from the rectification output terminal. The rectifier circuit 61 may be a full-wave rectifier circuit, a half-wave rectifier circuit, a bridge rectifier circuit or other types of rectifier circuits, but the disclosure is not limited thereto. In FIG. 3, the rectifier circuit 61 is a full-wave rectifier bridge composed of four diodes D11-D14 as an example, in which the anode of the diode D11 and the cathode of the diode D12 are electrically connected together as the first part of the rectifier circuit 61. For the rectification input terminal, the anode of the diode D13 and the cathode of the diode D14 are electrically connected together as the second rectification input terminal of the rectifier circuit 61. In addition, the cathodes of the diodes D11 and D13 are electrically connected together as the first rectification output terminal of the rectifier circuit 61, and the anodes of the diodes D12 and 14 are electrically connected together as the second rectification output terminal of the rectifier circuit 61.

The input terminal of the first filter circuit 62 is electrically connected to the rectified output terminal of the rectifier circuit 61 to receive the rectified signal, and filter the rectified signal to generate a filtered signal, and the output from the first filtered output terminal Ta1 and the second Filter output terminal Ta2 output. The first rectified output terminal can be regarded as the first filter input terminal of the first filter circuit 62, and the second rectified output terminal can be regarded as the second filter input terminal of the first filter circuit 62. In some embodiments, the first filter circuit 62 can filter out ripples in the rectified signal, so that the waveform of the generated filtered signal is smoother than the waveform of the rectified signal. In addition, the first filter circuit 62 can be configured to filter a specific frequency through a selection circuit configuration, so as to filter out the response/energy of the external driving power supply at the specific frequency. In some embodiments, the first filter circuit 62 may be a circuit composed of at least one of a resistor, a capacitor, and an inductance, such as a parallel capacitor filter circuit or a π-type filter circuit, and the disclosure is not limited thereto. In FIG. 3, the first filter circuit 62 is shown taking the capacitor C11 as an example, wherein the first end of the capacitor C11 (also the first filter output terminal Ta1) is electrically connected to the cathodes of the diodes D11 and D13 through the first rectified output terminal. And the second terminal of the capacitor C11 (also the second filter output terminal Ta2) is electrically connected to the anodes of the diodes D12 and D14 through the second rectified output terminal.

In some embodiments, the signal adjustment module 60 further includes a second filter circuit 63 and/or a third filter circuit 64, wherein the second filter circuit 63 is a filter circuit connected in series between the external power grid and the rectifier circuit 61, and the second filter circuit The three filter circuit 64 is a filter circuit electrically connected to the rectification input end of the rectification circuit 61 and connected in parallel with the rectification circuit 61. The arrangement of the second filter circuit 63/the third filter circuit 64 can suppress high-frequency interference or current limit in the input power Pin, so that the signal stability of the input power Pin is better. Similar to the aforementioned first filter circuit 62, the second filter circuit 63 and the third filter circuit 64 can also be circuits composed of at least one of a resistor, a capacitor, and an inductor, and the present disclosure is not limited to this. In FIG. 3, the second filter circuit 63 is shown taking inductors L11 and L12 as an example, where the inductor L11 is connected in series between one of the live and neutral wires of the external power grid EP and the first rectification input terminal of the rectification circuit 61 And the inductor L12 is connected in series between the other one of the live wire and the neutral wire of the external power grid EP and the second rectification input terminal of the rectifier circuit 61. In some embodiments, the inductors L11 and L12 may be common mode inductors or differential mode inductors. The third filter circuit 64 in FIG. 3 shows a capacitor C12 as an example, wherein the first end of the capacitor C12 is electrically connected to the inductor L11 and the first rectification input terminal (ie, the connection terminal between the anode of the diode D11 and the cathode of the diode D12 ), and the second end of the capacitor C12 is electrically connected to the inductor L12 and the second rectification input end (ie, the connection end of the anode of the diode D13 and the cathode of the diode D14).

4A is a schematic diagram of functional modules of a switching power supply module according to some embodiments of the disclosure. 4A, in some embodiments, the switching power supply module 70 may include a power conversion circuit 71, wherein the input end of the power conversion circuit 71 is electrically connected to the first filter circuit (the first filter circuit 62 in FIG. 3) Filter output terminals Ta1 and Ta2 to receive the filtered signal. In some embodiments, the power conversion circuit 71 may perform power conversion on the filtered signal in a current source mode to generate a stable power supply signal Sp. The power conversion circuit 71 includes a switching control circuit 72 and a conversion circuit 73. The conversion circuit 73 includes a switching circuit (also referred to as a power switch) PSW and a power conversion circuit ESE. The conversion circuit 73 receives the filtered signal, and according to the control of the switching control circuit 72, converts the filtered signal into a power supply signal Sp, which is output by the first power supply terminal T1 and the second power supply terminal T2 to supply power to the LED lamp.

FIG. 4B is a schematic diagram of the circuit structure of the power conversion circuit according to some embodiments of the disclosure. 4B, the power conversion circuit 71 of this embodiment is an example of a step-down DC-to-DC conversion circuit, which includes a switching control circuit 72 and a conversion circuit 73, and the conversion circuit 73 includes an inductor L21, a freewheeling diode D21, and a capacitor C21. And the transistor M21, wherein the inductor L21 and the freewheeling diode D21 constitute the power conversion circuit ESE1, and the transistor M21 is the switching circuit PSW1. The conversion circuit 73 is coupled to the filter output terminals Ta1 and Ta2 to convert the received filtered signal into a power supply signal Sp, which is output through the first power supply terminal T1 and the second power supply terminal T2.

In this embodiment, the transistor M21 is, for example, a MOSFET, which has a control terminal, a first terminal, and a second terminal. The first terminal of the transistor M21 is coupled to the anode of the freewheeling diode D21, the second terminal is coupled to the filter output terminal Ta2, and the control terminal is coupled to the switching control circuit 72 to receive the control of the switching control circuit 72 so that the first terminal and the second terminal are It is on or off. The first power supply terminal T1 is coupled to the filter output terminal Ta1, the second power supply terminal T2 is coupled to one end of the inductor L21, and the other end of the inductor L22 is coupled to the first end of the transistor M21. The capacitor C21 is coupled between the first power supply terminal T1 and the second power supply terminal T2 to stabilize the voltage fluctuation between the first power supply terminal T1 and the second power supply terminal T2. The cathode of the freewheeling diode D21 is coupled to the filter output terminal Ta1 and the first power supply terminal T1.

Next, the operation of the power conversion circuit 71 will be described. The controller 72 determines the turn-on and turn-off time of the switch 635 according to the current detection signal Scs1 or/and Scs2, that is, controls the duty cycle of the transistor M21 to adjust the size of the power supply signal Sp. The current detection signal Scs1 represents the magnitude of the current flowing through the transistor M21, and the current detection signal Scs2 represents the magnitude of the inductor current IL, where the current detection signal Scs2 can be obtained by arranging an auxiliary winding coupled with the inductor L21. According to any of the current detection signals Scs1 and Scs2, the switching control circuit 72 can obtain information on the magnitude of the power converted by the conversion circuit. When the transistor M21 is turned on, the current of the filtered signal flows in from the filter output terminal Ta1, and passes through the capacitor C21 and the first power supply terminal T1 to the back-end load (LED lamp), and then from the back-end load through the inductor L21 and the transistor M21 It flows out from the filter output terminal Ta2. At this time, the capacitor C21 and the inductor L21 are storing energy. When the transistor M21 is turned off, the inductor L21 and the capacitor C21 release the stored energy, and the current freewheels to the first power supply terminal T1 through the freewheeling diode D21 so that the back-end load is still continuously powered. Incidentally, the capacitor C21 is an unnecessary component and can be omitted, so it is indicated by a broken line in the figure. In some application environments, the effect of stabilizing the current of the LED module can be achieved by the characteristics of the inductance that the resistance current changes, and the capacitor C21 can be omitted.

In this embodiment, the power conversion circuit 71 can adopt any one of a buck circuit, a boost circuit, and a boost-buck circuit according to specific applications.

Please refer to FIG. 4A again. In some embodiments, the switching power supply module 70 may further include a power factor correction (PFC) circuit 74. The PFC circuit 74 is electrically connected between the filter output terminals Ta1 and Ta2 of the first filter circuit (the first filter circuit 62 in FIG. 3) and the input terminal of the power conversion circuit 71. In some embodiments, the PFC circuit 74 includes a switching control circuit 75 and a conversion circuit 76. The switching control circuit 75 controls the operation of the conversion circuit 76 to perform PFC compensation on the filtered signal and generate a PFC signal, that is, to improve the filtering. The power factor of the latter signal increases the active power of the filtered signal and reduces the reactive power.

The PFC circuit 74 may be, for example, a boost converter circuit (Boost circuit for short), as shown in FIG. 4C, which is a schematic diagram of the circuit structure of the power factor circuit according to some embodiments of the disclosure. 4C, the PFC circuit 74 includes a switching control circuit 75 and a conversion circuit 76, and the conversion circuit 76 includes a resistor R22, an inductor L22, a freewheeling diode D22, a capacitor C22, and a transistor M22, wherein the inductor L22 and the freewheeling diode D22 constitute power The conversion circuit ESE2, and the transistor M22 is the switch circuit PSW2. The conversion circuit 76 is coupled to the filter output terminals Ta1 and Ta2 to convert the received filtered signal into a PFC signal, and output to the power conversion circuit 71 through the PFC output terminals Ta3 and Ta4. Incidentally, the capacitor C22 is an unnecessary component and can be omitted, so it is indicated by a dashed line in the figure. In some application environments, the effect of stabilizing the current of the LED module can be achieved by the characteristics of the inductance that the impedance of the current changes, and the capacitor C22 can be omitted. In other embodiments, the power factor correction circuit may also be referred to as a power factor correction module.

Please refer to FIG. 4D, which shows a schematic diagram of the circuit structure of the power factor correction circuit of this application in another embodiment. As shown in the figure, the input of the power factor correction circuit 74 is coupled to the first filter output terminal Ta1 and the second filter output terminal Ta1. The filter output terminal Ta2 is output coupled to the PFC output terminals Ta3 and Ta4. The power factor correction circuit 74 includes a multiplier 2500, a switching control circuit 75, a first comparator CP24, a second comparator CP23, a transistor M23, a resistor R23, a diode D23, and an inductor L23. One end of the inductor L23 is coupled to the first filter output terminal Ta1, the other end is coupled to the anode of the diode D23, and the cathode of the diode D23 is coupled to the PFC output terminal Ta3. The first end of the transistor M23 is coupled to the connection node of the inductor L23 and the diode D23, the second end is connected to the reference low potential (for example, connected to the power ground GND, or connected to the reference ground SGND) via the resistor R23, and the control end is coupled to the switching control The output terminal of the circuit 75. The first input terminal of the first comparator CP24 is coupled to the PFC output terminal Ta3, the second input terminal receives a reference voltage Vt, and the output terminal is coupled to the first input terminal of the multiplier 2500. The second input terminal of the multiplier 2500 is coupled to the first filter output terminal Ta1, the output terminal is coupled to the second input terminal of the second comparator CP23, and the first input terminal of the second comparator CP23 is coupled to the resistor R23 and the transistor M23. At the connection node of the second end, the output end is coupled to the input end of the switching control circuit 75.

It should be noted that at least part of the circuit components of the multiplier 2500, the switching control circuit 75, the first comparator CP24, and the second comparator CP23 may be integrated in a controller to control the on and off of the transistor M23. The controller may also be integrated with the transistor M23. The controller is an integrated circuit, such as a control chip. The transistor M23 can be, for example, a metal-oxide-semiconductor field-effect transistor (MOSFET), a bipolar junction transistor (BJT), a triode, etc.

Specifically, after the output voltage V0 of the power factor correction circuit 74 at the PFC output terminal Ta3 is obtained by the first comparator CP24 and compared with the reference voltage Vt, the comparison result is sent to the first input terminal of the multiplier 2500, The second input terminal also obtains the voltage Vdc output by the first filtered output terminal Ta1, the multiplier 2500 outputs the reference signal Vi as the current feedback control based on the input of the first input terminal and the second input terminal, and the second comparator CP23 will The voltage signal reflecting the peak current of the inductor L23 obtained from the resistor R23 is compared with the reference signal Vi, and the comparison result is output to the switching control circuit 75 to control the on and off of the transistor M23, so that the current Ii of the input power factor correction circuit 74 and The waveform of the voltage Vdc is basically the same, which greatly reduces the current harmonics and improves the power factor.

Please refer to FIG. 4E, which shows a schematic diagram of the circuit structure of the power factor correction circuit of this application in another embodiment. As shown in the figure, the power factor correction circuit 74 of FIG. 4E includes a controller 2510, a transformer 2511, a diode 2512, and a transistor. 2515, resistor 2513_0, resistor 2513_1, resistor 2513_2, resistor 2513_3, resistor 2513_4, resistor 2513_5, resistor 2513_6, resistor 2513_7, resistor 2513_8, capacitor 2514_0, capacitor 2514_1. The controller 2510 has an inverting input terminal Inv, an error amplification output terminal Com, a multiplier input terminal Mult, a sampling terminal Cs, an input terminal Zcd of a zero-crossing detection signal, a drive output terminal Gd, and a chip power terminal Vcc. One end of the transformer 2511 is coupled to the first filter output terminal Ta1, the other end is coupled to the anode of the diode 2512, and the cathode of the diode 2512 is coupled to the PFC output terminal Ta3. The first end of the transistor 2515 is coupled to the connection node of the transformer 2511 and the diode 2512, and the second end is coupled to the second filter output terminal Ta2 (or connected to the power ground GND, or connected to the second pin 221) via a resistor 2513_7, and controls The terminal is coupled to the drive output terminal Gd of the controller 2510 via a resistor 2513_8. The sampling terminal Cs of the controller 2510 is coupled to the connection node between the second terminal of the transistor 2515 and the resistor 2513_7 via the resistor 2513_6. The chip power terminal Vcc is electrically connected to a constant voltage for supplying power to the controller 2510. The inverting input terminal Inv is coupled to a voltage divider circuit composed of a resistor 2513_0 and a resistor 2513_1 in series to obtain the voltage V0 output from the PFC output terminal Ta3. An RC compensation network composed of a resistor 2513_5, a capacitor 2514_0, and a capacitor 2514_1 is coupled between the inverting input terminal Inv and the error amplification output terminal Com. One end of the capacitor 2514_0 and one end of the capacitor 2514_1 are simultaneously coupled to the inverting input terminal Inv, and the other end of the capacitor 2514_0 is connected to the other end of the capacitor 2514_1 via a resistor 2513_5 and then connected to the error amplification output terminal Com. The multiplier input terminal Mult is coupled to the output of the voltage divider circuit in which the resistor 2513_3 and the resistor 2513_4 are connected in series to the first filter output terminal Ta1 and the second filter output terminal Ta2 (or ground terminal). The input terminal Zcd of the zero-crossing detection signal is coupled to the transformer 2511 via a resistor 2513_2.

It should be noted that the PFC output terminal Ta3 connected to the output of the power factor correction circuit 74 is also coupled to a capacitor 2514_1 to stabilize the electrical signal output by the active power factor correction module 251 and filter out high-frequency interference signals. Depending on the actual application, it is added or omitted (non-essential components), so it is represented by a dashed line in the figure. The same situation also includes at least one of the following circuit structures: a resistor and capacitor 2514_3 connected in parallel to both ends of the resistor 2513_4, a capacitor 2514_4 connected in parallel to both ends of the resistor 2513_1, and a resistor 2513_9 coupled between the control terminal and the second terminal of the transistor 2515, coupled The diode 2516 and the resistor 2513_10 between the control terminal of the transistor 2515 and the resistor 2513_8 are coupled to the resistor 2513_6 between the resistor 2513_7 and the sampling terminal Cs of the controller. Among them, the circuit structures shown by the dashed lines can also be replaced by more complex or simpler circuit structures. For example, the sampling terminal Cs of the controller is connected to the resistor 2513_7 through a wire. For another example, the capacitor 2514_5 is composed of a tank circuit including at least two capacitors. The equivalent circuits or integrated circuits improved based on the above examples should be regarded as some specific examples of power factor correction circuits.

The following describes the working process of the power factor correction circuit 74 shown in FIG. 4E. The DC voltage signal V0 output by the power factor correction circuit 74 is divided by the resistor 2513_0 and the resistor 2513_1 in series to form a voltage divider circuit and then input to the reverse input of the controller 2510. At the terminal Inv, the voltage signal Vdc input to the power factor correction circuit 74 is divided by a voltage divider circuit composed of a resistor 2513_3 and a resistor 2513_4 in series, and then input to the multiplier input terminal Mult to determine the waveform and phase of the voltage signal Vdc. The high-frequency current induced by the primary inductance (also known as the primary coil and the primary winding) is input to the input terminal Zcd of the zero-crossing detection signal through the secondary inductance (also known as the secondary coil and the secondary winding) of the mutual inductance and the resistance 2513_2 as a pass Zero detection signal. When the transistor 2515 is turned on, the voltage signal Vdc is input to the reference low potential (for example, the second filter output terminal Ta2, or the power ground GND, or the second pin 221) through the primary inductance of the transformer 2511 and the transistor 2515. During this period, The transformer 2511 stores energy (also called excitation), and the electrical signal output by the transistor 2515 is obtained by the sampling terminal Cs to sample the inductor current in the transformer 2511; synchronously, the multiplier input terminal Mult of the controller 2510 receives the The resistor 2513_3 samples the signal Vdc and generates an internal reference signal Vi based on the electrical signal of the sampled signal Vdc for detecting the sampling signal obtained by the sampling terminal Cs based on the internal reference signal Vi. When the level value of the sampling signal obtained by the sampling terminal reaches the level value provided by the internal reference signal Vi, in other words, when it is detected that the inductor current in the primary inductance of the transformer 2511 reaches the peak value, the controller 2510 controls the transistor 2515 to turn off. At this time, the primary inductance of the transformer 2511 discharges energy (also called demagnetization), and the secondary inductance of the transformer 2511 induces the discharge operation and outputs a zero-crossing detection signal. When the transformer 2511 is discharged so that the output current is reduced to close to zero, the zero-crossing detection signal received by the controller 2510 is also close to zero. The controller 2510 determines according to the zero-crossing detection signal received by the input terminal Zcd of the zero-crossing detection signal The time when the discharging operation ends, and the control logic set based on the detection result of the zero-crossing detection signal is used to output a signal that the driving transistor 2515 is turned on from the driving output terminal Gd to supply power to the back-end circuit.

Wherein, the controller 2510 can be selected as a control chip integrated with a special circuit for optimizing harmonic distortion (or THD optimization) or power factor correction, which is used to effectively control the crossover distortion and crossover distortion of the input current input to it. Ripple distortion, thereby improving power factor and reducing harmonic distortion. For example, the controller 2510 may use the L6562 chip, the L6561 chip, or the L6560 chip. The transistor 2515 is a three-terminal controllable power device, such as a metal-oxide-semiconductor field-effect transistor (MOSFET), a bipolar junction transistor (BJT), Triode and so on.

The circuit architecture of the power factor correction circuit is not limited to this. The power factor correction circuit can also be, for example, a boost type (Boost) power factor correction circuit, a buck type (Buck) power factor correction circuit, and a buck-boost type (Boost- Buck) power factor correction circuit, forward power factor correction circuit, or flyback power factor correction circuit.

The power factor correction module can also, for example, adopt a passive power factor correction unit, which can be implemented by connecting a resonant filter on the AC side, thereby increasing the conduction angle of the current in the AC signal. In some specific examples, the technician can adjust the power factor correction module 25 in the embodiment shown in FIG. 6 to be coupled between the first input terminal 201, the second input terminal 202 and the rectifier module 24 of the dimmer 20 , So that the power factor correction module 25 receives the AC signal output by the external AC power supply, performs power factor correction on the AC signal, and then outputs the AC signal to the rectifier module 24.

In other specific examples, it can also be implemented by adding a passive power factor correction circuit including a diode and a capacitor after the rectifier module in the circuit architecture of the rectifier module shown in FIG. 3, so that the passive power factor correction circuit has both The function of the filter module. In some more specific examples of the power factor correction module with filtering function, the filtering module 23 in the embodiment shown in FIG. 6 is an omissible module.

FIG. 5A is a schematic diagram of functional modules of the dimmer according to some embodiments of the disclosure. Referring to FIG. 5A, the dimmer 80 includes a signal synthesis module 81 and a command conversion module 82. The signal synthesis module 81 is used to modulate the power supply signal Sp by using the dimming signal Sdim to generate a modulated power supply Pin_C after dimming processing; or it can be said that the power supply signal Sp and the dimming signal Sdim are synthesized and processed into modulation Power Pin_C. The command conversion module 82 is used to receive the dimming command DIM, and convert the dimming command DIM into a dimming signal Sdim with a specific format. The dimming signal Sdim of the specific format may be, for example, a signal indicating a phase cut time, a frequency conversion signal in response to dimming information, or a digital code in response to dimming information (for example, a square wave with a specific order of high/low levels) Etc., the above-mentioned signal format can be presented in the form of pulse or square wave, so the dimming signal Sdim can be a signal composed of two signal states of high level and low level in appearance.

In other embodiments, the command conversion module 82 may be referred to as a dimming signal generation module. The signal synthesis module 81 may be referred to as a signal synthesis processing module. The power conversion circuit may be referred to as a power conversion unit.

Below, FIG. 5B is used to illustrate the specific circuit configuration of the dimmer 80 in some embodiments, wherein FIG. 5B is a schematic diagram of the circuit structure of the dimmer according to some embodiments of the present disclosure. Referring to FIG. 5B, the signal synthesis module 81 may include, for example, a power conversion circuit 71, a feedback adjustment circuit 83, and a signal generation circuit 84. The power conversion circuit 71 may be as described in the embodiment of FIG. 4B. Description, I will not repeat it here. In this embodiment, the feedback adjustment circuit 83 is electrically connected to the power conversion circuit 71, and is used to generate a corresponding feedback signal according to the signal state on the power supply terminal and feed it back to the switching control circuit 72 of the power conversion circuit 71, so that the switching control circuit 72 The control of the transistor M21 is adjusted according to the feedback signal, and then the signal fluctuation on the power supply terminal is compensated, so that the output is stable. The signal generating circuit 84 is electrically connected to the feedback adjusting circuit 83, and is used to determine whether to adjust the voltage on the power supply terminals T1/T2 according to the signal state of the dimming signal Sdim.

In other embodiments, the feedback adjustment circuit 83 and the signal generation circuit 84 may be collectively referred to as a feedback adjustment unit. The feedback adjustment unit 2 adjusts the sampling signal obtained from the power supply terminal T1/T2 based on the dimming signal Sdim output by the instruction conversion module 82, and outputs a feedback signal based on the adjusted sampling signal, and the feedback signal is transmitted to the power conversion circuit 71 The power conversion circuit 71 performs energy conversion on the power supply signal obtained from the pins ta1/ta3 based on the feedback signal, so as to output an output signal with a synthesized dimming signal at the power supply terminal T1/T2.

Specifically, when the dimming signal Sdim is at a low level, the signal generation circuit 84 will not adjust the voltage on the power supply terminals T1/T2, so the feedback signal output by the feedback adjustment circuit 83 will not fluctuate significantly, so that The voltage on the power supply terminals T1/T2 can be dynamically stabilized at a set voltage.

When the dimming signal Sdim switches from a low level to a high level, the signal generation circuit 84 will pull up the voltage on the power supply terminals T1/T2, and this momentary pull up of the voltage will affect the operation of the feedback adjustment circuit 83, so that The feedback adjustment circuit 83 outputs a corresponding feedback signal to instruct the switching control circuit 72 to adjust the voltage on the power supply terminal T1/T2 back to the set voltage. Then, when the dimming signal Sdim returns from the high level to the low level again, the voltage regulation effect of the signal generating circuit 84 on the power supply terminal T1/T2 disappears, and the power conversion circuit 71 still tends to use the power supply terminal T1/T2. The upper voltage is adjusted downward to approach the set voltage. At this time, the voltage on the power supply terminals T1/T2 will be quickly pulled back to the vicinity of the set voltage. In summary, the voltage on the power supply terminal T1/T2 is pulled up in response to the control of the signal generating circuit 84, and then reduced to the set voltage in response to the control of the power conversion circuit 71 and the feedback regulating circuit 83, that is, the voltage at the power supply terminal T1 /T2 forms a pulse/square wave waveform superimposed on the set voltage, and this waveform will be roughly synchronized with the dimming signal Sdim. The signal with a pulse/square wave waveform superimposed on the set voltage is the modulated power Pin_C generated by the dimmer 80.

In some embodiments, the feedback adjustment circuit 83 includes an inductor L31, a capacitor C31, resistors R31-R34, diodes D31-D32, an op amp unit CP31, and an optocoupler unit U31, wherein the inductor L31, capacitor C21, resistors R31 and R32, and diodes D31 and D32 can form a feedback auxiliary module, and resistors R33 and R34 can form a resistance module.

Specifically, in the feedback auxiliary module, one end of the inductor L31 is electrically connected to the ground terminal GND1, and is coupled with the inductor L21 to induce a signal on the inductor L21. One end of the capacitor C31 is electrically connected to the other end of the inductor L31. The anode of the diode D31 is electrically connected to the ground terminal GND2, and the cathode of the diode D31 is electrically connected to the other end of the capacitor C31. The anode of the diode D32 is electrically connected to the cathode of the diode D31 and the other end of the capacitor C31. One ends of the resistors R31 and R32 are commonly electrically connected to the cathode of the diode D32, and the other end of the resistor R31 is electrically connected to the optocoupler unit U31. The operational amplifier unit CP31 has a first input terminal, a second input terminal and an output terminal. Its first input terminal is electrically connected to the other end of the resistor R32, and its second input terminal is electrically connected to the resistor module and the signal generating circuit 84, and its The output terminal is electrically connected to the optocoupler unit U31. In some embodiments, the first input terminal of the operational amplifier unit CP31 may also be electrically connected to a voltage regulator tube, but the disclosure is not limited to this. The optocoupler unit U31 includes a light-emitting component Ua and a photosensitive component Ub. The anode of the light-emitting component Ua is electrically connected to the other end of the resistor R31, and the cathode of the light-emitting component Ua is electrically connected to the output end of the operational amplifier unit CP31; one end of the photosensitive component Ub The bias power supply Vcc1 is electrically connected (it can be generated by dividing the bus voltage or generated by an auxiliary winding), and the other end of the photosensitive component Ub is electrically connected to the feedback control terminal of the switching control circuit 72.

The resistance module is used to divide the voltage on the power supply terminal T1 and provide the divided voltage signal to the operational amplifier unit CP31. In the resistance module, the resistors R33 and R34 are connected in series between the power supply terminal T1 and the ground terminal GND2, and the connection ends of the resistors R33 and R34 are electrically connected to the second input terminal of the operational amplifier unit CP31. In other words, the second input terminal of the operational amplifier unit CP31 can be regarded as being electrically connected to the voltage dividing point of the resistance module to receive the divided voltage signal, that is, the sampling signal. The signal output by the operational amplifier unit CP31 is a feedback signal, and is transmitted to the switching control circuit 72 through the optocoupler unit U31.

The signal generating circuit 84 includes a resistor R35 and a transistor M31. One end of the resistor R35 is electrically connected to the second input end of the operational amplifier unit CP31 and the connection end of the resistors R33 and R34. The transistor M31 has a first terminal, a second terminal, and a control terminal. The first terminal is electrically connected to the other terminal of the resistor R35, the second terminal is electrically connected to the ground terminal GND2, and the control terminal is electrically connected to the command conversion circuit 82. Receive the dimming signal Sdim.

In other embodiments, the signal generating circuit 84 can be called a regulating circuit; the resistor R33 and the resistor R34 can be called a sampling circuit; the operational amplifier unit CP31 can be called a comparison circuit; the optocoupler unit U31 can be called a signal transmission Circuit; and, the inductor L31, the capacitor C31, the diodes D31, and D31 can be referred to as a reference signal generating circuit. The first input terminal of the operational amplifier unit may be a forward input terminal, and the second input terminal of the operational amplifier unit may be a reverse input terminal.

The specific circuit actions of the dimmer 80 are illustrated below in conjunction with FIGS. 8A and 8B. FIGS. 8A and 8B are schematic diagrams of signal waveforms of the dimmer according to some embodiments of the disclosure. In this embodiment, the dimming signal Sdim is an example of a pulse signal whose frequency changes according to the brightness information indicated by the dimming command DIM, but the disclosure is not limited to this.

Please refer to Figure 5B and Figure 8A at the same time. When the command conversion circuit 82 receives an instruction to adjust the brightness to 30% of the maximum brightness, the command conversion circuit 82 will generate a dimming signal Sdim with a period of T1 and provide it to the control of the transistor M31. end. During the low level period of the dimming signal Sdim, the transistor M31 is kept off, so that the resistor R35 can be regarded as a floating state, so the voltage of the power supply terminal T1 and the operation of the feedback adjustment circuit 83 will not be affected. During the high level period of the dimming signal Sdim, the transistor M31 is turned on, so that the resistor R35 is equivalent to being connected in parallel with the resistor R34. At this time, since the parallel connection of the resistors R34 and R35 will reduce the impedance between the second input terminal of the operational amplifier unit CP31 and the ground terminal GND2, the voltage on the power supply terminal T1 will be increased accordingly. On the other hand, because the operational amplifier unit CP31 will respond to the voltage change on its second input terminal, the signal on the output terminal will change accordingly, and the output terminal signal change of the operational amplifier unit CP31 will affect the amount of light emitted by the light-emitting component Ua, making the light sensitive The conduction degree of the resistance Ub has a corresponding change. The change in the conduction degree of the photoresistor Ub will affect the voltage fed back to the feedback control terminal of the switching control circuit 72, so that the switching control circuit 72 tends to reduce the duty cycle of the transistor M21 during the high level period of the dimming signal Sdim. The suddenly raised voltage on the power supply terminal T1 is quickly pulled back to the set voltage Vset.

Therefore, when the dimming signal Sdim returns from high level to low level again, the voltage on the power supply terminal T1 will also quickly return to the set voltage Vdet, so that the modulated power supply Pin_C is formed and adjusted on the basis of the set voltage Vdet. The optical signal Sdim is almost synchronized with a pulse with a period of T1. On the whole, it can be considered that the dimming signal Sdim is superimposed on the power supply signal Sp to form the modulated power Pin_C.

From another perspective, when the dimming signal Sdim switches from low to high, the transistor R35 is turned on, and the resistors R35 and R34 are connected in parallel to reduce the impedance between the second input terminal of the op amp unit CP31 and the ground terminal GND2. , The voltage division at the second input terminal of the op amp unit CP31 is reduced, and at this time the voltage at the first input terminal of the op amp unit remains unchanged, in order to continue to maintain the voltage at the second input terminal of the op amp and the voltage at the first input terminal at the same level. At the same time, the output signal of the operational amplifier unit CP31 is transmitted to the switching control circuit 72 through the signal transmission circuit U31, so that the switching control circuit 72 adjusts the output voltage of the power conversion circuit (that is, the voltage at the power supply terminal T1) to increase, and when the voltage at the power supply terminal T1 increases After being high, the divided voltage at the second input terminal of the operational amplifier unit CP31 rises to the same level as the first input terminal. On the whole, during the low level period of the dimming signal Sdim, the transistor M31 is turned off, and the voltage at the power supply terminal T1 is the set voltage Vset; when the dimming signal Sdim is at a high level, the transistor M31 is turned on, and the power supply terminal T1 The voltage rises. The magnitude of the voltage increase at the power supply terminal T1 is related to the resistors R33, R34, and R35.

In other embodiments, the resistance value of the resistance in the sampling circuit can also be changed to realize that when the dimming signal is low, the voltage of the power supply terminal T1 is the set voltage Vset; when the dimming signal Sdim is high, it is normal, The voltage of the power supply terminal T1 drops.

In this embodiment, the first input terminal of the operational amplifier unit CP31 is coupled to a constant voltage source or a reference signal generating circuit for receiving the reference signal Vref.

Please refer to FIGS. 5B and 8B at the same time. When the command conversion circuit 82 receives an instruction to adjust the brightness to 80% of the maximum brightness, the command conversion circuit 82 will generate a dimming signal Sdim with a period of T2 and provide it to the control of the transistor M31. At the end, the period T2 is smaller than the period T1, that is, the frequency of the dimming signal Sdim corresponding to 30% of the maximum brightness is lower than the frequency of the dimming signal Sdim corresponding to 70% of the maximum brightness. During the low-level and high-level periods of the dimming signal Sdim, the feedback adjustment module 83 and the signal generation module 84 operate similarly to the above-mentioned embodiment, so that the modulated power supply Pin_C can form a dimming signal based on the set voltage Vdet. Sdim is approximately synchronized with a pulse with a period of T2. On the whole, it can be considered that the dimming signal Sdim is superimposed on the power supply signal Sp to form the modulated power Pin_C.

In the above-mentioned embodiment, the signal synthesis module 81 can be regarded as the use of the existing power conversion circuit 71 configuration to realize part of the signal synthesis function, so here the power conversion circuit 71 is regarded as a part of the signal synthesis module 81 . However, in the functional module division of some embodiments, the signal synthesis module 81 can also be regarded as not including the power conversion circuit 71 (that is, only includes the feedback adjustment circuit 83 and the signal generation circuit 84). At this time, the signal synthesis module 81 is a cooperative power supply. The conversion circuit 71 generates the modulated power Pin_C. In addition, in the functional module division of other embodiments, the feedback adjustment circuit 83 can also be regarded as a part of the power conversion circuit 71. Regarding the specific configuration of the power conversion circuit 71, reference may be made to the foregoing embodiment for description, which will not be repeated here.

Refer to FIG. 5C for a schematic diagram of a circuit structure of a dimmer according to another embodiment of the invention. The dimming circuit structure in this embodiment is similar to the embodiment shown in FIG. 5B. The difference is that in this embodiment, the signal generating circuit 84 includes a transistor M31, and B is connected in parallel with a resistor R36. The sampling circuit includes resistors R33, R34, and R36, and the three resistors are connected in series to the power supply terminal T1 and the ground terminal GND2. The signal generating circuit 84 adjusts the impedance from the second input terminal of the operational amplifier unit CP31 to the ground terminal GND2 by bypassing the resistor R36 in the sampling circuit, thereby affecting the voltage on the power supply terminal T1. The actions of other parts are the same as in the previous embodiment, and will not be repeated here. In other embodiments, other methods may be used to adjust the impedance between the second input terminal of the operational amplifier unit CP31 and the ground terminal GND2. For example, a controlled variable resistor may be used. For example, the linear region corresponds to dimming. The power tube of the signal voltage change interval. For example, the controlled variable resistor can be connected in series or in parallel with the voltage divider resistor in the sampling circuit, and the control end of the variable resistor receives the dimming signal Sdim to change the resistance according to the change in the amplitude of the dimming signal Sdim, thereby adjusting the sampling Sampling signal output by the circuit. The signal amplitude of the sampling signal reflects the brightness information of the dimming signal.

Refer to FIG. 5D for a schematic diagram of a circuit structure of a dimmer according to another embodiment of the present invention. In this embodiment, the signal synthesis module 81 includes a power conversion circuit 71 and a signal synthesis processing module 85. The signal synthesis processing module 85 is electrically connected to the power conversion circuit 71 for adjusting the voltage of the power supply terminal T1 according to the dimming signal Sdim. Similar to the foregoing embodiment, the output voltage of the power conversion circuit 71 (the voltage of the power supply terminal T1) is adjusted according to the dimming signal Sdim. The technical means used in this embodiment is different from the foregoing embodiment.

The signal synthesis processing module 85 includes a transistor M32, diodes D33, D34, and D35. The first pin of the transistor is electrically connected to one end of the inductor L21, the second pin is electrically connected to the second power supply terminal T2, and the third pin is electrically connected to the command conversion module 82. The diodes D33, D34, and D35 are connected in series and connected in parallel to the first pin and the second pin of the transistor M32.

8A, the transistor M32 is controlled by the dimming signal Sdim and turned on/off. When the dimming signal Sdim is low, the transistor M32 is turned off, and the power supply signal output by the power conversion circuit 71 passes through the diodes D33, D34 and The first transmission path formed by D35 supplies power to the LED lighting device, and the voltage of the modulated power supply Pin_C is Vset; when the dimming signal Sdim is a high-level signal, the transistor M32 is turned on, bypassing the transistors D33, D34 and D35, the power conversion circuit The power supply signal output by 71 supplies power to the LED lighting device via the second transmission path formed by the transistor M32. The voltage of the modulated power supply Pin_C is Vset1. Because the second transmission path has a smaller impedance than the first transmission path, compared to the first transmission path, the voltage Vset1>Vset of the modulated power supply Pin_C formed when the second path is turned on. Correspondingly, a pulse signal with the same frequency and pulse width as the dimming signal Sdim is formed on the modulating power Pin_C.

In other embodiments, the diodes D33, D34, and D35 can be collectively referred to as a voltage dividing unit, and the transistor M32 can be collectively referred to as a control unit.

Refer to FIG. 5E for a schematic diagram of a circuit structure of a dimmer according to another embodiment of the present invention. In this embodiment, the signal synthesis module 81 includes a power conversion circuit 77 and a signal synthesis processing module 86. The signal synthesis processing module 86 is electrically connected to the power conversion circuit 77 for adjusting the voltage between the power supply terminals T1 and T2 according to the dimming signal Sdim. This embodiment is similar to the embodiments shown in FIG. 5C and FIG. 5D in that the output voltage (the voltage of the power supply terminal T1) is adjusted by the signal synthesis processing module. The technical means used in this embodiment are different from the above embodiments.

The circuit structure of the power conversion circuit 77 is similar to the power conversion circuit 71, and is also a BUCK type power conversion circuit. The difference is that the connection mode of the devices in the power conversion circuit 77 is different from the power conversion circuit 71. The power conversion circuit 77 includes a switching control circuit 78, a resistor R24, an inductor L24, a diode D24, a capacitor C24, and a transistor M24. The resistor R24, the inductor L24, the diode D24, the capacitor C24, and the transistor M24 constitute a conversion circuit 79. The first pin of the transistor M24 is electrically connected to the filter output terminals Ta1/Ta3, the second pin is electrically connected to the cathode of the diode D24 and the first pin of the inductor L24, and the third pin is electrically connected to the switch Control circuit 78. The second pin of the inductor L24 is electrically connected to the first power supply terminal T1. The anode of the diode D24 is electrically connected to the first pin of the resistor R24 and the second power supply terminal T2. The two ends of the capacitor C24 are electrically connected to the power supply terminals T1 and T2, respectively. The second pin of the resistor R24 is electrically connected to the ground terminal GND1. The working principle of the power conversion circuit 71 is similar to the embodiment described in FIG. 4B, and will not be repeated here.

The signal synthesis processing module 86 includes a transistor M33 and a resistor R37. The first pin of the view transistor is electrically connected to the first pin of the resistor R37, the second pin is electrically connected to the first power supply terminal T1, and the third pin is electrically connected to the command conversion module 82. The second pin of the resistor R37 is electrically connected to the filter output terminal Ta1/Ta3.

The operation principle of the dimmer of this embodiment will be described below with reference to FIG. 8A. The transistor M33 is turned on/off controlled by the dimming signal Sdim. When the dimming signal Sdim is always at a low level, the transistor M33 is turned off. The power supply signal Sp (that is, the modulation The waveform of the power supply Pin_C whose voltage is Vset) is as shown in FIG. 8A, which is the output signal of the power supply conversion circuit 77 after the power supply conversion. When the dimming signal Sdim is at a high level, the transistor M33 is turned on, and the filtered signal is directly output to the power supply terminals T1 and T2 through the path formed by the resistor R37 and the transistor M33, and the obtained modulated power Pin_C voltage is Vset1. In this embodiment, the power conversion circuit 77 is a step-down power conversion circuit, so Vset1>Vset. Correspondingly, if the dimming signal is a pulse signal, it is modulated by the signal synthesis processing module 86, and the modulated signal Pin_C can be obtained from the power supply terminals T1 and T2, the waveform of which is shown in FIGS. 8A-8B.

In other embodiments, the resistor R37 can be omitted without affecting the function to be achieved in this embodiment.

Through the description of the above embodiments, those skilled in the art can understand how to make the dimmer output the modulated power Pin_C with dimming information. The following will further explain how the LED lighting device lights up and emits light through the modulated power supply Pin_C and at the same time demodulates dimming information from the modulated power supply Pin_C, and then adjusts the right LED control according to the dimming information. Through the dimmer of the above embodiment, those skilled in the art can understand how to load the dimming signal to the modulated power supply Pin_C, and use the modulated power supply Pin_C to dim the load.

1C is a schematic block diagram of LED lighting systems according to other embodiments of the present invention. The LED lighting system 100 includes a dimmer 80 and an LED lamp 100. The dimmer 80 is connected between the power input terminal A1 and the LED lamp 100 to convert the set dimming information into a dimming signal, and the dimming signal is loaded on the power signal to generate a dimming power signal. The LED lamp 100 includes multiple lamps such as LED lamp 100_1, LED lamp 100_2, etc. The LED lamp 100 receives the dimming power signal output by the dimmer 80, demodulates the dimming signal contained in the dimming power signal, and dims according to this The signal adjusts the brightness or color of the LED light. LED lights 100_1, 100_2...100_n (n is a positive integer greater than or equal to 1) can simultaneously receive the dimming power signal output by the dimmer 80, and adjust the brightness or color of the LED lights, so that one dimmer can adjust multiple lights at the same time the goal of. In this embodiment, 120-1, 100_2...100_n are LED lights with the same or similar configuration. In other embodiments, the dimming power signal may also be referred to as a modulated power source.

In this embodiment, one end of the dimmer 80 is electrically connected to the power input terminal A1, and the other end is connected to the LED lamp. Through this configuration, a single power line can be used to achieve the purpose of dimming (also known as single live wire dimming). Since the traditional wall switch is usually connected in series between the power input terminal A1 and the LED light, the dimmer 80 can directly replace the traditional wall switch to upgrade the existing lighting system without the need to rearrange the power line. The configuration method of this embodiment can be used to conveniently upgrade the lighting system and reduce the installation cost.

The LED lamp 100 in this embodiment can be any LED lamp that uses external power to supply power, such as an LED straight tube lamp, an LED down lamp, an LED ceiling lamp, and the like.

Refer to FIG. 8I for a schematic diagram of a waveform of a dimming power signal of an LED lighting system according to an embodiment of the present invention. An AC half wave is divided into 3 stages. The power supply stage t1 is used to supply power to the control unit. The power stage t2 is used to provide power for the LED lights to light the LED lights. The data stage t3 is used to load the dimming signal onto the power signal to generate the dimming power signal.

Refer to FIG. 5F for a circuit block diagram of a dimmer according to another embodiment of the present invention. The dimmer 80 includes a zero-crossing detection module 801, a data modulation module 802, a power supply module 803, a control module 804, a dimming signal generation module 805, a filter circuit 806, and a diode 807. The zero-crossing detection module 801 is electrically connected to the power input terminal A1, the dimmer output terminal 80a, and the control module 804, respectively. The zero-crossing detection module 801 collects the power signal from the power input terminal A1 and the dimmer output terminal 80a. When the waveform is converted from a positive half cycle to a negative half cycle or from a negative half cycle to a positive half cycle, when the zero potential is passed, a zero-crossing signal is generated and The zero-crossing signal is sent to the control module 804. The data modulation module 802 is electrically connected to the power input terminal A1, the dimmer output terminal 80a, the control module 804, and the anode of the diode 807, respectively. The data modulation module 802 is controlled by the control module 804 to load the dimming signal Sdim onto the power signal to generate a dimming power signal, and transmit it to the downstream load through the dimmer output terminal 80a. The power supply module 803 is connected to the filter circuit 806 and the control module 804 respectively. The power supply module 803 is used to perform a power conversion on the received power signal to generate a power supply signal for the dimmer 80 to use. The dimming signal generating module 805 is electrically connected to the control module 804. The dimming signal generating module 805 is used to convert the set dimming command DIM into a dimming signal Sdim and send it to the control module 804. The control module 804 receives the dimming signal Sdim from the dimming signal generating module 805, and loads the dimming signal Sdim to the power signal through the data modulation module 802 to generate a dimming power signal. The control module 804 receives the zero-crossing signal from the zero-crossing detection module 801, and starts the data modulation action at a specific time after receiving the zero-crossing signal. The filter circuit 806 is electrically connected to the data modulation module 802 through the diode 807, receives the power signal processed by the data debugging module 802, filters it, generates a filtered signal, and transmits the signal to the power supply module 803. The cathode of the diode 807 is electrically connected to the filter circuit 806 to prevent the current of the filter circuit 806 from flowing into the data modulation module 802 and cause interference to the data modulation circuit 802.

The control module 804 is electrically connected to the circuit node REFD, and the circuit node REFD serves as a reference potential node in the circuit.

In other embodiments, the dimming signal generating module 805 may include a wireless remote control and a signal receiving module. The wireless remote control module is used to convert the user-set dimming command DIM into a wireless dimming signal and send it to the signal receiver module. The signal receiving module receives the wireless dimming signal and converts the wireless dimming signal into a dimming signal Sdim, dimming The signal Sdim contains the set dimming information. In some embodiments, the dimming signal generation module may also be referred to as a command conversion module.

In some embodiments, the dimming signal generating module 805 may also include a light sensing module (not shown in the figure). The light sensor module is used to receive ambient light and generate a dimming signal Sdim according to the intensity of the ambient light, so as to realize the function of automatically adjusting the brightness of the LED lamp according to the ambient light.

Refer to FIG. 11A for a schematic circuit diagram of a zero-crossing detection module according to an embodiment of the present invention. The zero-crossing detection module 801 includes

resistors

8011, 8012, 8015, and 8016,

capacitors

8013 and 8017, and

Zener diodes

8014 and 8018. The first pin of the resistor 8011 is electrically connected to the power input terminal A1, and the second pin of the resistor 8011 is electrically connected to the first pin of the resistor 8012. The second pin of the resistor 8012 is electrically connected to the circuit node REFD. The capacitor 8013 is connected in parallel with the resistor 8012. The anode of the Zener diode 8014 is electrically connected to the circuit node REFD, its cathode is electrically connected to the zero-crossing detection module output terminal 801a, and the zero-crossing detection module output terminal 801a is electrically connected to the control module 804. The component configuration of the zero-crossing detection module 801 between the dimmer output terminal 80a and the zero-crossing detection module output terminal 801b is similar to the configuration of the power input terminal A1 and the zero-crossing detection module output terminal 801a. The first lead of the resistor 8015 The pin is electrically connected to the dimmer output terminal 80a, and the second pin of the resistor 8015 is electrically connected to the first pin of the resistor 8016. The second pin of the resistor 8016 is electrically connected to the circuit node REFD. The capacitor 8017 is connected in parallel with the resistor 8016. The anode of the Zener diode 8018 is electrically connected to the circuit node REFD, its cathode is electrically connected to the zero-crossing detection module output terminal 801b, and the zero-crossing detection module output terminal 801b is electrically connected to the control module 804.

The operation principle of the zero-crossing detection module 801 will be described below in conjunction with FIG. 11A. Because of the series voltage division of the

resistors

8011 and 8012, the voltage across the resistor 8012 is proportional to the voltage between the power input terminal A1 and the reference potential point REFD. The capacitor 8013 is used to stabilize the voltage across the resistor 8012. The Zener diode 8014 is used to limit the maximum voltage across the resistor 8012 to a preset value. The zero-crossing detection module output terminal 801a is used to transmit the voltage signal on the resistor 8012 to the control module 804. Similar to the configuration between the power input terminal A1 and the zero-crossing detection circuit output terminal 801a, the zero-crossing detection module output terminal 801b also transmits the voltage on the resistor 8016 to the control module 804. Inside the control module, the zero-crossing detection module output terminal 801a is electrically connected to the positive input terminal of a comparator, and the zero-crossing detection module output terminal 801b is electrically connected to the negative input terminal of the comparator. In other embodiments, the comparator can also be provided outside the control module 804. When the waveform at the power input terminal A1 changes from a negative half cycle to a positive half cycle, the potential at the output terminal 801a of the zero-crossing detection circuit is higher than the potential at 801b, and the comparator outputs a high-level signal. When the waveform at the power input terminal A1 changes from a positive half cycle to a negative half cycle, the potential at the output terminal 801a of the zero-crossing detection circuit is lower than the potential at 801b, and the comparator outputs a low-level signal. The control module 804 determines the zero-crossing point by detecting the level change of the output terminal of the comparator.

Refer to FIG. 11B for a schematic circuit diagram of a data modulation module according to an embodiment of the present invention. The data modulation module 802 includes

diodes

8021, 8022, and 807, a Zener diode 8023, and

MOS tubes

8024, 8025, and 8026. The anode of the diode 8021 is electrically connected to the power input terminal A1 and the first pin of the MOS transistor 8024. The cathode of the diode 8021, the cathode of the diode 8022, and the cathode of the Zener diode 8023 are electrically connected and connected to the anode of the diode 807. The cathode of the diode 807 is electrically connected to the filter circuit. The anode of the diode 8022 is electrically connected to the first pin of the MOS tube 8025. The anode of the Zener diode 8023 is electrically connected to the first pin of the MOS tube 8026. The second pin of the MOS transistor 8024 is electrically connected to the second pin of the MOS transistor 8025 and is electrically connected to the circuit node REFD. The third pin of the MOS transistor 8024, the third pin of the MOS transistor 8025, and the second pin of the MOS transistor 8026 are electrically connected and electrically connected to the control module 804.

The actions of the data modulation module 802 in each circuit stage are described below with reference to FIG. 8I.

In the power supply phase t1, the data modulation module 802 can be used as a rectifier circuit to rectify the received external power signal to generate a rectified signal. The filter circuit 806 filters the rectified signal after receiving the rectified signal. The operation principle of the data modulation module 802 as a rectifier circuit will be described below. In the data stage, the MOS tube 8024 and MOS tube 8025 have not received the enable signal and are in the off state. The body diodes of the MOS tube 8024 and the MOS tube 8025 together with the diode 8021 and the diode 8022 form a full-bridge rectifier circuit, which is effective for the received power The signal is rectified, and the rectified signal is obtained. The anode of the body diode of the MOS tube 8024 is electrically connected to the circuit node REFD, and the cathode is electrically connected to the anode of the diode 8021. Similarly, the anode of the body diode of the MOS tube 8025 is electrically connected to the circuit node REFD, and the cathode is electrically connected to the anode of the diode 8022.

In the power stage t2, the third pin of the MOS tube 8024 and the third pin of the MOS tube 8025 receive the enable signal of the control module 804, the MOS tube 8024 and the MOS tube 8025 are closed and conducted, and the external power signal can be passed through the power signal The loop formed by the input terminal A1, the MOS tube 8024, the MOS tube 8025, and the dimmer output terminal 80a is directly transmitted to the LED lamp 100.

In the data phase t3, the data modulation module 802 acts as a modulation circuit to load the dimming signal Sdim onto the power line. The control module 804 controls the MOS tube 8026 to turn on intermittently, and with the actions of the MOS tube 8024 and the MOS tube 8025, the dimming signal can be loaded on the power signal to generate a dimming power signal. Refer to the signal waveform of the data stage in FIG. 8I. In this embodiment, each half wave carries a group of data, and a group of data includes at least one digital signal. A pulse in the data phase t3 on the waveform diagram corresponds to a digital signal. The combination of multiple digital signals can be combined into dimming data. The dimming data is a digital signal, which can simultaneously carry brightness and color information, or other dimming information.

Using the circuit characteristics of the MOS tube in the data modulation module 802, the data modulation module 802 can implement different circuit functions in different circuit stages. In the power supply phase t1, the

MOS transistors

8024 and 8025 in the data modulation module 802 are in the off state. The body diodes of the

MOS transistors

8024 and 8025 and the

diodes

8021 and 8022 form a full-bridge rectifier circuit to rectify the received power signal. In order to generate the rectified signal; in the power stage t2, the

MOS transistors

8024 and 8025 in the data modulation module 802 are in the conducting state, and the external power signal can be directly passed through the power input terminal A1, the

MOS transistors

8024 and 8025 and the dimmer output terminal The power supply path formed by 80a supplies power to the LED lamp 100; in the data phase t3, the

MOS tubes

8024 and 8025 in the data modulation module 802 work in the amplifying area, and the MOS tube 8026 is driven to be turned on intermittently to generate a pulse signal on the power signal ( Refer to Figure 8I). The pulse width of this pulse signal corresponds to the on-time of the MOS tube 8026. Using the characteristics of the pulse signal to characterize the 1 and 0 of the digital signal, the digital signal can be loaded on the power signal. The characteristics of the pulse signal are, for example, but not limited to, the width of the pulse signal, the amplitude of the pulse signal, and so on.

Through this configuration method, the data modulation module 802 can operate in the power supply phase t1, the power phase t2, and the data phase t3, respectively, so that multiple circuit functions can be realized through one circuit configuration, which can greatly simplify the circuit structure and save costs.

In other embodiments, the data modulation module 802 may only operate in one or two of the power supply phase t1, the power phase t2, and the data phase t3.

Refer to FIG. 12C for a schematic diagram of the circuit structure of a filter circuit according to an embodiment of the present invention. In this embodiment, the filter circuit FC1 includes a capacitor C1. The first pin of the capacitor C1 is electrically connected to the terminal c1 and the terminal d1, and the second pin of the capacitor C1 is electrically connected to the terminal c2 and the terminal d2.

FIG. 12D is a schematic diagram of the circuit structure of a filter circuit according to another embodiment of the present invention. In this implementation, the filter circuit FC2 includes capacitors C2 and C3 and an inductor L1. The first pin of the inductor L1 is electrically connected to the terminal c1, and the second pin of the inductor L1 is electrically connected to the terminal d1. The capacitor C2 is electrically connected to the terminals c1 and c2, and the capacitor C3 is electrically connected to the terminals d1 and d2, respectively. The filter circuit FC2 is a π-type filter circuit, which filters the received circuit signal to generate a filtered signal.

The filter circuit 806 in the dimmer 80 may use the filter circuit FC1 or FC2 in FIG. 12C or 12D. Further, the terminal c1 is electrically connected to the cathode of the diode 807, the terminal c2 is electrically connected to the circuit node FEFD, and the terminals d1 and d2 are electrically connected to the power supply module 803, respectively.

In this embodiment, the filter circuit FC1 or FC2 filters the received power signal, and generates the filtered signal for use by the power supply module 803.

In other embodiments, the filter circuit 806 may adopt other forms of filter circuit structure, and the present invention is not limited to this.

The power supply module 803 in the dimmer 80 can adopt the circuit structure of the power conversion circuit 71 shown in FIG. 4A. Further, the input end of the power conversion circuit 71 is electrically connected to the filter circuit 806 for receiving the filtered signal and performing Power conversion, which converts the received filtered signal into a stable output signal of the power supply module.

In this embodiment, the power supply module 803 can use the step-down DC-to-DC conversion circuit described in FIG. 4B to perform step-down conversion on the received filtered signal. For its working principle, refer to the related description in FIG. 4B, and will not be repeated here. . In this embodiment, the power supply module 803 can adopt any one of a buck circuit, a boost circuit, and a boost-buck circuit according to specific applications.

Refer to FIG. 12E for a schematic circuit diagram of a dimming signal generating module according to an embodiment of the present invention. The dimming signal generating module 805 includes a variable resistor 8051, a resistor 8052, and a capacitor 8053. The first pin of the variable resistor 8051 is electrically connected to the voltage source V1, the second pin of the variable resistor 8051 is connected to the circuit node REFD, and the third pin of the variable resistor 8051 is connected to the first pin of the resistor 8052. The first pin of the capacitor 8053 is electrically connected to the second pin of the resistor 8052, and the second pin of the capacitor 8053 is electrically connected to the circuit node REFD. The output terminal 805a of the dimming signal generating module 805 is electrically connected to the second pin of the resistor 8052. The voltage source V1 is used to provide a constant voltage. By changing the position of the third pin of the sliding rheostat 8051, the voltage of the third pin relative to the circuit node REFD can vary from 0 to V1, and the voltage change from 0 to V1 corresponds to the different brightness of the LED lamp. The voltage signal corresponding to the third pin of the resistor 8051 is the dimming signal Sdim. The output terminal 805a of the dimming signal generating module 805 is electrically connected to the control module 804, and the dimming signal Sdim is transmitted to the control module 804.

In other embodiments, the dimming signal generating module 805 may include a wireless remote control and a signal receiving module. The wireless remote control module is used to convert the user-set dimming information into a wireless dimming signal and send it to the signal receiver module. The signal receiving module receives the wireless dimming signal and converts the wireless dimming signal into a dimming signal Sdim, the dimming signal Sdim contains the set brightness or color information.

In some embodiments, the dimming signal generating module 805 may also include a light sensing module. The light sensor module is used to receive ambient light and generate a dimming signal Sdim according to the intensity of the ambient light. In this way, the LED lamp can automatically adjust the brightness or color according to the ambient light.

In this application, the LED lamp 100 may be referred to as an LED lighting device in other embodiments. The LED lamp 100 may adopt the circuit structure of FIGS. 6A-6B. The difference is that in this embodiment, the LED lamp 100 is electrically connected to the dimmer output terminal 80a and the power input terminal A2, that is, the first connection terminal 101 is electrically connected to the dimmer output terminal 80a, and the second connection The terminal 102 is electrically connected to the power input terminal A2 to receive the dimming power signal output by the dimmer and demodulate the dimming information therein for dimming.

1F is a schematic diagram of functional modules of an LED lighting system according to another embodiment of the present invention. The LED lighting system 10 further includes a sensor 30. The sensor 30 is electrically connected to the dimmer 80 and the LED lamp 100 for turning on and off the power supply circuit according to environmental variables. The power supply circuit is a current path formed by an external power signal through the power input terminal A1, the dimmer 80, the LED lamp 100, and the power input terminal A2. The environmental variable in this embodiment may be whether human activity is detected, the intensity of the ambient light, and so on. For example, when human activity is detected, the sensor 30 turns on the power supply circuit to light the LED light; when no human activity is detected, the sensor 30 disconnects the power supply circuit to extinguish the LED light. With this arrangement, the LED lighting system 10 can determine whether to turn on the LED light by detecting human activity, and only turn on the LED light when there is human activity, thereby saving resources and reducing waste.

FIG. 22A is a schematic diagram of a circuit structure of a sensor according to an embodiment of the present invention. The sensor 30 includes a sensor power supply module 301, a sensor control module 302, and a switch device 303. The sensor power supply module 301 is electrically connected to the dimmer 80 and the power input terminal A2. The switching device 303 is electrically connected to the dimmer 80 and the LED lamp 100, that is, it is connected to the power supply circuit. The sensor control module 302 is electrically connected to the sensor power supply module 301 and the switching device 303. The sensor power supply module 301 is used to receive the dimming power signal output by the dimmer 80 and perform power conversion to generate a low-voltage DC power signal that can be used by the sensor control module 302. The sensor control module 302 is used to process environmental variables and generate control signals to control the on and off of the switching device 303.

FIG. 22B is a schematic diagram of a circuit structure of a sensor power supply module according to an embodiment of the present invention. The sensor power supply module 301 includes

capacitors

3011, 3013, a full-bridge rectifier circuit 3012, and a Zener diode 3014. The first pin of the capacitor 3011 is electrically connected to the output terminal of the dimmer 80, and the second pin of the capacitor 3011 is electrically connected to the input terminal of the full-bridge rectifier circuit 3012. The power input terminal A2 is electrically connected to the input terminal of the full-bridge rectifier circuit 3012. The capacitor 3013 and the Zener diode 3014 are connected in parallel and electrically connected to the output terminal of the full-bridge rectifier circuit 3012. The sensor control module 302 is electrically connected to the two ends of the Zener diode 3014. In this embodiment, the sensor power supply circuit 131 is a resistance-capacitance step-down circuit, which steps down the received dimming power signal for use by the sensor control module 302. In other embodiments, a resistor (not shown in the figure) is connected in parallel at both ends of the capacitor 3011 to discharge the energy of the capacitor 3011 and increase the stability of the system.

When the switching device 303 is closed in this embodiment, the circuit structure of FIG. 22B can be equivalent to the circuit structure of FIG. 22C. Referring to FIG. 22C, the sensor 30 includes a capacitor C30 and a resistor R30. The capacitor C30 and the resistor R30 are connected in series and connected in parallel with the LED lamp 100.

Referring to FIGS. 22C and 8I at the same time, the dimming power signal is the signal output by the dimmer 80. The sensor 30 and the LED lamp 100 are connected in parallel and electrically connected to the dimmer 80. The circuit characteristics of the sensor 30 affect the dimming power signal Make an impact. The sensor 30 includes a capacitor C30, and the capacitor C30 filters the received signal. After the data stage t3 of the dimming information contained in the dimming power signal is filtered by the capacitor C30, its waveform will change. When the waveform deformation exceeds a certain degree, The LED light will not be able to recognize the dimming information in the dimming power signal, which will result in the inability to perform dimming and the entire dimming system will fail.

FIG. 22D is a schematic diagram of a circuit structure of a sensor according to another embodiment of the present invention. The sensor 30 includes a rectifier circuit 306, a filter circuit 304, a power conversion circuit 305, a sensor control module 302, and a switching device 303. The rectifier circuit 306 is electrically connected to the dimmer 80 and the power input terminal A2. The filter circuit 304 is electrically connected to the rectifier circuit 306. The power conversion circuit is electrically connected to the filter circuit 304. The sensor control module 302 is electrically connected to the power conversion circuit 305 and the control pins of the switching device 303. The first pin of the switch device 303 is electrically connected to the output terminal of the dimmer 80, and the second pin is electrically connected to the LED lamp. The rectifier circuit 306 is used to rectify the received dimming power signal to generate a DC signal. The filter circuit 304 is used to receive the rectified DC signal and perform filtering to generate a smooth DC signal. The power conversion circuit 305 is used for power conversion of the smooth DC signal to generate a low voltage DC signal for the sensor control module 302 to use. The sensor control module 302 is used to process environmental variables and generate control signals to control the on and off of the switching device 303.

The rectifier circuit 306 in this embodiment may adopt the circuit structure of FIG. 12A or 12B, which will not be repeated here. The filter circuit 304 in this embodiment may adopt the circuit structure of the filter circuit described in FIG. 12C or 12D, and the present invention is not limited thereto. For the specific configuration of the power conversion circuit 305 in this embodiment, reference may be made to the circuit structure of FIG. 4A and FIG. 4B, which will not be repeated here.

The circuit architecture of the sensor 30 in this embodiment is similar to the circuit architecture of the sensor 30 in the embodiment shown in FIG. 22A. The difference is that the sensor power supply module 301 in the embodiment shown in FIG. The circuit structure supplies power to the sensor 30, and in this embodiment, a circuit structure of rectification, filtering and power conversion is used to supply power to the sensor 30. As described in the foregoing embodiments, the RC step-down circuit structure will affect the dimming power signal, so that the dimming system cannot be used normally. In this implementation, the rectifier circuit 306 is used to isolate the circuit. The capacitive devices included in the circuit after the rectifier circuit 306 (including the filter circuit 304, the power conversion circuit 305, and the sensor control module 302) will not interfere with the dimming power signal. Ensure that the dimming power signal can be recognized by the LED lights for dimming.

Specifically, there are many possible implementations for realizing dimming control by adjusting the signal characteristics of the input power Pin. A general conventional implementation is to adjust the effective value (RMS) of the input power Pin by adjusting the conduction angle of the input power Pin, and then adjust the size of the driving power Sdrv.

1A and 8C are used to illustrate the conventional dimming control method and the corresponding circuit operation, in which Fig. 8C is a schematic diagram of a dimming waveform of an LED lighting system. 1A and 8C at the same time, in this embodiment, the external power grid EP is to provide AC power as the input power Pin as an example, and in Figure 8C is the half-cycle voltage waveform of the input power Pin with the amplitude of VPK is shown As an example to illustrate. In Fig. 8C, from top to bottom, there are three different dimming control modes: the luminous brightness Lux is the highest brightness Lmax, the luminous brightness Lux is 50% of the highest brightness Lmax, and the luminous brightness Lux is 17% of the highest brightness Lmax. The following voltage waveforms WF1, WF2, and WF3. Among them, the dimmer 80 can adjust the tangent angle/conduction angle of the input power Pin by controlling the on or off state of the controllable electronic components connected in series on the bus. For example, if the input power Pin is to be modulated with a phase cut angle of 90 degrees, the dimmer 80 can turn off the controllable electronic components within 1/4 cycle of the input power Pin, and during the remaining period of the half cycle Keep the controllable electronic components turned on. In this way, the voltage waveform of the input power Pin can be zero during the period from 0 to 90 degrees, and the sine wave waveform is re-formed during the period from 90 degrees to 180 degrees (take the leading edge tangent as an example, but it is not limited to this). Among them, the input power Pin after the phase cut is the input power Pin_C with a conduction angle of 90 degrees. The principle of using other phase cut angle to modulate the input power Pin is similar to the above.

Looking at the voltage waveform WF1 first, when the dimmer 80 modulates the input power Pin with a phase cut angle of 0 degrees in response to the dimming signal Sdim (that is, the conduction angle of the input power Pin is 180 degrees), at this time The dimmer 80 directly provides the input power Pin to the LED lighting device 100, that is, the input power Pin is equal to the input power Pin_C at this time. In this case, the effective value of the input power Pin_C is Vrms1, and the power module PM will generate the corresponding drive power Sdrv based on the input power Pin_C with the effective value of Vrms1 to drive the LED module LM, so that the luminous brightness Lux of the LED module LM is the highest brightness Lmax.

From the perspective of the voltage waveform WF2, when the dimmer 80 modulates the input power Pin with a phase cut angle of 90 degrees in response to the dimming signal Sdim (that is, the conduction angle of the input power Pin is 90 degrees), the adjustment is now The optical device 80 disconnects the bus bar when the phase of the input power Pin is 0 to 90 degrees, and turns on the bus bar when the phase is 90 to 180 degrees. In this case, the effective value of the input power Pin_C is Vrms2, where Vrms2 is less than Vrms1, and the luminous brightness Lux is equal to 50% of the highest brightness Lmax.

From the perspective of the voltage waveform WF3, when the dimmer 80 modulates the input power Pin with a phase cut angle of 90 degrees in response to the dimming signal (that is, the conduction angle of the input power Pin is 30 degrees), then the dimming The device 80 disconnects the bus bar when the phase of the input power Pin is from 0 degrees to 150 degrees, and turns on the bus bar when the phase is from 150 degrees to 180 degrees. In this case, the effective value of the input power Pin_C is Vrms3, where Vrms3 is less than Vrms2, and the luminous brightness Lux is equal to 17% of the highest brightness Lmax.

According to the above-mentioned dimming control method, the dimmer 80 can adjust the phase cut/conduction angle of the input power Pin, so that the effective value of the input power Pin_C (such as Vrms1, Vrms2, Vrms3) changes accordingly. The change in the effective value of the input power supply Pin_C is basically positively correlated with the change in the conduction angle of the input power supply Pin_C, that is, the larger the conduction angle of the input power supply Pin_C, the greater the effective value of the input power supply Pin_C. In other words, the change in the effective value of the input power Pin_C is basically negatively correlated with the tangent angle of the input power Pin_C. In general, the conventional dimming control method described above actually implements the dimming function by modulating the effective value of the input power. The advantage of this dimming method is that because the driving power Sdrv will directly reflect the effective value of the input power Pin_C and change accordingly, the LED lighting device 100 does not need to change the hardware configuration, and only needs to add a dimmer 80 to the system. Can realize dimming function.

More specifically, in this dimming mode, in order to allow the effective value of the input power Pin to have a sufficient amplitude change, so that the luminous brightness can be changed by a corresponding amplitude, the dimmer 80 controls the phase cut angle/conduction angle When modulating the effective value of the input power Pin, a larger phase adjustment range is inevitably required. For example, dimming is usually performed between 0 degrees and 180 degrees. However, when the conduction angle of the modulated power supply Pin_C is small to a certain extent, the total harmonic distortion (THD) and power factor (PF) characteristics of the power module PM will be significantly affected, thereby causing The power conversion efficiency is greatly reduced, and it may also cause the problem of flickering of the LED module LM. In other words, under this dimming method, the efficiency of the power module PM is limited by the dimmer 80 and it is difficult to improve.

On the other hand, since the effective value of the modulated power supply Pin_C will be _{directly affected by the magnitude of the amplitude V PK} , the dimmer 80 using the above-mentioned dimming method is not compatible with various grid voltage specifications (such as 120V, 230V). Or 277V AC voltage) environment. The designer needs to adjust the parameters or hardware design of the dimmer 80 according to the application environment of the LED lighting system 10, which will increase the overall production cost of the product.

In response to the above-mentioned problems, this disclosure proposes a new dimming control method and its LED lighting system and LED lighting device, which can use the change of the phase angle/conduction angle of the input power Pin as a modulated signal, which can be demodulated The modulation signal is used to obtain the actual dimming information, and accordingly, the power module PM is controlled to generate the circuit operation of the driving power Sdrv. Since the change of the tangent angle/conduction angle is only to carry the dimming information corresponding to the dimming signal DIM, instead of directly adjusting the effective value of the modulating power Pin_C, the dimmer 80 can be used in a smaller phase. The tangent angle/conduction angle of the input power Pin is adjusted within the interval, so that the effective value of the processed modulated power Pin_C will not be too far from the input power Pin provided by the external power grid EP. With this dimming control method, the conduction angle of the modulated power supply Pin_C is similar to the input power supply Pin regardless of the brightness state, so that the THD and PF characteristics can be maintained. This means that the conversion efficiency of the power module PM will not be suppressed by the dimmer 80. The following is a further description of the dimming control method taught in this disclosure and the structure and operation of the corresponding LED lighting device.

Please refer to FIGS. 6A and 8D to 8G together. In this embodiment, the dimmer may, for example, modulate the tangent angle of the input power Pin in the dimming phase interval D_ITV. In FIG. 8D, from top to bottom, the voltage waveform WF4 of the dimming phase interval D_ITV, the voltage waveform WF5 when the luminous brightness Lux is the highest brightness Lmax, and the voltage waveform WF6 when the luminous brightness Lux is the lowest brightness Lmin are shown in order from top to bottom.

Looking at the voltage waveform WF4 first, the dimming phase interval D_ITV is composed of the phase interval between the lower limit tangent angle C1 and the upper limit tangent angle C2. The lower limit tangent angle C1 may be, for example, an interval of 0 degrees to 15 degrees. Any value within (such as 1, 2, 3... and so on), but this disclosure is not limited to this. In addition, the upper limit tangent angle C2 can be, for example, any value in the interval of 20 degrees to 45 degrees (such as 21, 22, 23... and so on), but the present disclosure is not limited to this. In other words, the dimming phase interval D_ITV may be, for example, a phase interval of 0 degrees to 45 degrees, a phase interval of 5 degrees to 45 degrees, a phase interval of 5 degrees to 20 degrees, a phase interval of 15 degrees to 20 degrees, or 15 degrees. The phase interval to 45 degrees, etc., can be selected according to design requirements. In this disclosure, the choice of the upper limit tangent angle C2 is mainly based on two principles: first, the width of the dimming phase interval D_ITV can have sufficient resolution during mapping; second, the dimmer will modulate the power supply When the tangent angle of Pin_C is adjusted to the upper tangent angle C2, the THD and PF characteristics of the power module PM can still be maintained (for example, not less than 80% of the THD and PF during dimming at the lower limit tangent angle C1, preferably To make THD less than 25% and/or make PF greater than 0.9). From the perspective of the voltage waveform WF5, when the dimmer 80 modulates the input power Pin with the phase cut angle C1 in response to the dimming signal Sdim (that is, the conduction angle of the input power Pin is 180-C1 degrees), the adjustment is now The optical device 80 disconnects the bus bar during the period when the phase of the input power Pin is 0 to C1, and conducts the bus bar during the period from C1 to 180 degrees. In this case, the demodulation module 240 generates a dimming control signal Sdc instructing to adjust the luminous brightness Lux to the highest brightness Lmax according to the modulated power Pin_C with a phase cut angle of C1. The switching control circuit 331 uses the dimming control signal Sdc as a reference for controlling the switching of the power switch PSW, and then causes the conversion circuit 132 to generate a corresponding driving power Sdrv to drive the LED module LM, and maintain the luminous brightness Lux of the LED module LM at the highest brightness Lmax.

From the perspective of the voltage waveform WF6, when the dimmer 80 modulates the input power Pin with a phase cut angle C2 in response to the dimming signal (that is, the conduction angle of the input power Pin is 180-C2 degrees), then the dimming The device 80 will disconnect the bus during the period when the phase of the input power Pin is 0° to C2, and turn on the bus during the period when the phase is 150° to 180°. In this case, the demodulation module 140 generates a dimming control signal Sdc instructing to adjust the luminous brightness Lux to the lowest brightness Lmin according to the modulated power Pin_C with a phase cut angle of C2. The switching control circuit 331 uses the dimming control signal Sdc as a reference for controlling the switching of the power switch PSW, and then causes the conversion circuit 132 to generate a corresponding driving power Sdrv to drive the LED module LM, and reduce the luminous brightness Lux of the LED module LM to the lowest brightness. Lmin. In this embodiment, the minimum brightness Lmin may be, for example, 10% of the maximum brightness Lmax.

Although this embodiment also adopts the method of modulating the phase cut angle/conduction angle to achieve dimming control, since this embodiment only uses the phase cut angle/conduction angle change of the modulated power supply Pin_C as an indicator dimming information The reference signal is not to make the change of the effective value of the modulated power supply Pin_C be directly reflected in the change of the luminous brightness. Therefore, in the dimming control method of this embodiment, the selected dimming phase interval D_ITV will be significantly smaller than The dimming phase interval under the dimming control method of FIG. 8C. From another perspective, in the dimming control method of this embodiment, regardless of whether the dimmer uses any phase cut angle in the dimming phase interval to modulate the input power Pin, the resulting modulated power Pin_C is There will not be much difference between the effective values. For example, in some embodiments, the effective value of the modulated power supply Pin_C (such as the effective value under the voltage waveform WF6) generated based on the upper limit phase cut angle C2 modulation will not be lower than that generated based on the lower limit phase cut angle C1 modulation. The effective value of the modulated power supply Pin_C (such as the effective value under the voltage waveform WF5) exceeds 50%.

From another point of view, in the aforementioned general and conventional implementation, since the luminous brightness of the LED module is adjusted directly related to the effective value of the modulated power supply Pin_C, therefore, in the general and conventional implementation, the modulation of the power supply Pin_C is The effective value range ratio is approximately the same as the brightness range ratio of the LED module. The definition of the effective value range ratio here is the ratio of the maximum value to the minimum value of the effective value of the modulated power supply Pin_C, and the definition of the brightness range ratio is the ratio of the maximum value to the minimum value of the luminous brightness of the LED module . In contrast, according to the present disclosure, as mentioned above, the effective value range ratio of the modulated power supply Pin_C may not be related to the brightness range ratio of the LED module. In some preferred embodiments, the effective value range ratio of the modulated power supply Pin_C is It may be smaller than the brightness range ratio of the LED module. In some preferred embodiments, the effective value range Pin_C ratio of the input power after modulation is less than or equal to 2, and the brightness range ratio of the LED module is greater than or equal to 10.

It should be noted that the correlation of the luminance Lux of the LED module LM with respect to the change of the tangent angle is only an example and not a limitation. For example, in other embodiments, the luminance of the LED module may be negatively correlated with The tangent angle of the power supply Pin_C is modulated.

Referring to FIG. 8E, in this embodiment, from the voltage waveform WF7, when the dimmer 80 modulates the input power Pin with a phase cut angle C1 in response to the dimming signal Sdim (that is, when the input power Pin is turned on) The angle is 180-C1 degrees). At this time, the dimmer 80 will disconnect the bus bar when the phase of the input power Pin is 0 degrees to C1, and turn on the bus bar when the phase is C1 to 180 degrees. In this case, the demodulation module 140 generates a dimming control signal Sdc that instructs to adjust the luminous brightness Lux to the lowest brightness Lmin according to the modulated power Pin_C with a phase cut angle of C1. The switching control circuit 131 uses the dimming control signal Sdc as a reference for controlling the switching of the power switch PSW, and then causes the conversion circuit 132 to generate a corresponding driving power Sdrv to drive the LED module LM, and maintain the luminous brightness Lux of the LED module LM at the lowest brightness. Lmin.

From the perspective of the voltage waveform WF8, when the dimmer 80 modulates the input power Pin with a phase cut angle C2 in response to the dimming signal (that is, the conduction angle of the input power Pin is 180-C2 degrees), then the dimming The device 80 will disconnect the bus during the period when the phase of the input power Pin is 0° to C2, and turn on the bus during the period when the phase is 150° to 180°. In this case, the demodulation module 140 generates a dimming control signal Sdc instructing to adjust the luminous brightness Lux to the highest brightness Lmax according to the modulated power Pin_C with a phase cut angle of C2. The switching control circuit 131 uses the dimming control signal Sdc as a reference for controlling the switching of the power switch PSW, and then causes the conversion circuit 132 to generate a corresponding driving power Sdrv to drive the LED module LM, and reduce the luminous brightness Lux of the LED module LM to the highest brightness Lmax. Incidentally, in the embodiments of FIG. 8D and FIG. 8E, the tangent angle C2 is greater than the tangent angle C1.

Below, FIG. 8F and FIG. 8G are used to further illustrate the specific circuit actions and signal generation mechanism of the demodulation module 240 in different embodiments. 8F and 8G are respectively schematic diagrams of the corresponding relationship between the phase cut angle, the demodulation signal, and the brightness of the LED module in different embodiments of the present disclosure.

Please refer to FIG. 6A, FIG. 8F and FIG. 8G together. The demodulation circuit 140 of this embodiment adopts a signal processing method similar to an analog circuit to realize the acquisition and conversion of dimming information. It can be seen from FIG. 8F that when the tangent angle ANG_pc of the modulating power supply Pin_C is adjusted in the interval between C1 and C2, the level of the dimming control signal Sdc will correspondingly change in the interval between V1 and V2. In other words, the phase cut angle ANG_pc of the modulated power supply Pin_C will have a positive linear relationship with the level of the dimming control signal Sdc in the dimming phase interval. From the perspective of the operation of the demodulation module 140, when the demodulation module 140 determines that the phase cut angle of the modulated power Pin_C is C1, it will correspondingly generate a dimming control signal Sdc with a level of V1; similarly, when When the demodulation module 140 determines that the phase cut angle of the modulated power Pin_C is C2, it will correspondingly generate a dimming control signal Sdc with a level of D2.

Then, the dimming control signal Sdc that is positively related to the tangent angle ANG_pc is given to the switching control circuit 131, so that the switching circuit 132 generates a corresponding driving power Sdrv to drive the LED module LM, and makes the LED module LM have a corresponding luminous brightness Lux . In some embodiments, the luminous brightness Lux of the LED module LM has a negative linear relationship with the level of the dimming control signal Sdc. As shown in FIG. 8F, when the dimming control signal Sdc received by the switching control circuit 131 is at a level Va between the level V1 and the level V2, the switching control circuit 331 will adjust the lighting control signal Slc accordingly, The LED module LM is driven by the driving power supply Sdrv to emit light with the brightness La. Wherein, the brightness La and the level Va have an inverse relationship, and can be represented by La=(Lmax-Lmin)/(V2-V1)*(V2-Va)+Lmin, but the present disclosure is not limited to this.

It is worth noting that the above-mentioned mechanism for generating the dimming control signal Sdc and the luminous brightness Lux is just to explain that the demodulation module 140 of the present disclosure extracts and converts the signal characteristics (such as the phase tangent angle) of the modulated power supply Pin_C. It is mapped to the dimming control signal Sdc, so that the driving circuit 130 can adjust the luminous brightness Lux of the LED module LM based on the dimming control signal Sdc, which is similar to the signal conversion implementation of the analog circuit, but it is not used to limit the present invention. The scope of disclosure. In some embodiments, the corresponding relationship between the tangent angle ANG_pc and the dimming control signal Sdc shown in FIG. 8F may also be a non-linear relationship. For example, the tangent angle ANG_pc and the dimming control signal Sdc have an exponential correspondence. Similarly, the corresponding relationship between the dimming control signal Sdc and the luminous brightness Lux shown in FIG. 8F may also be a non-linear relationship, and the present disclosure is not limited to this. In addition, in some embodiments, the phase cut angle ANG_pc and the level of the dimming control signal Sdc may also be negatively correlated. In some embodiments, the brightness La and the level Va may also have a positive correlation.

6A and 8G, the demodulation module 140 of this embodiment adopts a signal processing method similar to a digital circuit to achieve the acquisition and conversion of dimming information. Specifically, the phase tangent angle of the modulated power supply Pin_C is When adjusted within the default interval, the dimming control signal will have a default number of different signal states corresponding to the change of the tangent angle, so as to correspondingly control the LED module dimming to the default number of dimming levels. For further example, it can be seen from FIG. 8G that when the phase tangent angle ANG_pc of the modulated power supply Pin_C is adjusted in the interval between C1 and C2, the dimming control signal Sdc will correspond to the change of the phase tangent angle ANG_pc and have D1 to 8 different signal states such as D8. In other words, the phase cut angle ANG_pc of the modulated power supply Pin_C is divided into 8 sub-intervals in the dimming phase interval, and each sub-interval corresponds to a signal state D1-D8 of the dimming control signal Sdc. In some embodiments, the signal state may be indicated by a level; for example, the dimming control signal Sdc in the state D1 corresponds to a level of 1V, and the dimming control signal Sdc in the state D8 corresponds to a level of 5V. In some embodiments, the signal state can be indicated by a multi-bit logic level; for example, the dimming control signal Sdc in state D1 corresponds to a logic level of "000", and the dimming control signal Sdc in state D8 corresponds to "111". "Logic level.

Then, the dimming control signal Sdc with signal states D1-D8 is given to the switching control circuit 131, so that the switching circuit 132 generates a corresponding driving power Sdrv to drive the LED module LM, and makes the LED module LM have a corresponding luminous brightness Lux . In some embodiments, the signal states D1-D8 may correspond to the different luminous brightness Lux of the LED module LM in one-to-one correspondence. As shown in FIG. 8F, the signal states D1-D8 may correspond to 100%, 87.5%, 75%, 62.5%, 50%, 37.5%, 25%, and 10% of the highest brightness Lmax, respectively, for example. It should be mentioned here that, in this embodiment, the demodulation module 140 is designed with a resolution of 3 bits as an example (ie, 8-segment dimming), but the present disclosure is not limited to this.

FIG. 8H is a schematic diagram of input power waveforms of the LED lighting device of an embodiment of the disclosure under different grid voltages. Please refer to Figure 1A, Figure 6A and Figure 8H together. It can be seen from the figures that no matter the peak voltage of the input power Pin is a1 or a2, if the dimmer 80 modulates the input power with the phase cut angle C3, then The modulated power Pin_C generated by the dimmer 80 still has the same zero-level period (ie, the period from 0 to C3). Therefore, regardless of the peak voltage of the input power Pin, the demodulation module 140 can still demodulate the same dimming control signal Sdc for the modulated power Pin_C with the same phase cut angle. In other words, no matter what kind of external power grid EP specification the LED lighting system 10 is applied to, the LED lighting system 10 can make the LED lighting device 100 have the same light-emitting brightness or color temperature when receiving the same dimming signal Sdim, so It can be compatible with the application of various grid voltage specifications. From another perspective, in the present disclosure, the dimming of the LED module (such as the brightness or the color temperature) responds to the tangent angle of the modulated power supply Pin_C, but does not substantially respond to the peak voltage of the external power grid.

It should be noted that the parasitic effects of the circuit components or the matching between the components are not necessarily ideal. Therefore, although it is desired that the dimming of the LED module does not respond to the peak voltage of the external power grid, in fact The dimming effect of the LED module may still slightly respond to the peak voltage of the external power grid, that is, according to the present disclosure, it is acceptable that the dimming effect of the LED module caused by the imperfection of the circuit slightly responds to the external power grid The peak value of the voltage, which means that the aforementioned "substantially" does not respond to the peak value of the external grid voltage, and the other references to "substantially" in this article are also the same. The term "slightly" here, in one embodiment, can mean that when the peak value of the external grid voltage is twice, the dimming of the LED module is only affected by, for example, less than 5%.

1E is a schematic diagram of functional modules of an LED lighting system according to another embodiment of the present invention. The LED lamp lighting system 10 includes a dimmer 80 and an LED lamp 100. The dimmer 80 is electrically connected to the external power EP and the LED lamp 100. It is used to generate the dimming signal Sdim according to the dimming operation, and transmit the dimming signal Sdim to the LED lamp. The LED lamp 100 is electrically connected to the external power EP and the dimmer 80 for receiving the external power signal to light up, and dimming according to the received dimming signal Sdim. In this embodiment, the LED lamp 100 only needs 3 wires to achieve a complete dimming function.

In this embodiment, the LED lamp 100 includes a demodulation module 140, an LED driving module LD, and an LED module LM. The demodulation module 140 is electrically connected to the dimmer 80 to receive the dimming signal Sdim generated by the dimmer and convert the dimming signal Sdim into a dimming control signal Sdc. The LED driving module LD is electrically connected to the demodulation module 140 and the external power EP to receive the external power signal for power conversion to generate the driving power Sdrv, and at the same time receive the dimming control signal Sdc of the demodulation module 140, and according to the dimming control signal Sdc adjusts the driving power Sdrv to dim the LED light. The LED module LM is electrically connected to the LED driving module LD for receiving the driving power Sdrv of the LED driving module LD to light up.

In this embodiment, the LED lamp 100 may adopt the circuit architecture of FIGS. 6A-6B, and the LED driving module LD includes a rectifier circuit 110, a filter circuit 120, and a driving circuit 130. For the principle of operation, refer to the related descriptions in FIGS. 6A to 6B, which will not be repeated here.

Refer to FIG. 15A for a schematic circuit diagram of a dimmer according to an embodiment of the present invention. The dimmer 80 includes a switch 801 and a switch 802. One end of the switch 801 is electrically connected to the power signal input terminal L, and the other end is electrically connected to the LED driving module LD and the switch 802. The other end of the switch 802 is electrically connected to the demodulation module 140. In this embodiment, the switch 801 is arranged in the entire power circuit (the circuit through which the external power EP supplies power to the LED lamp), and is used as a switch for the entire system. The switch 801 is set to be normally open. When the switch 801 is off, the external power signal cannot provide power for the dimmer 80 and the LED lamp, and the LED lamp 100 and the dimmer 80 do not work; when the switch 801 is closed, the LED lamp lighting system 10 works normally and is dimmed The device 80 can dimming the LED lamp. The switch 802 is used to generate a dimming signal Sdim0 according to a dimming operation. In this embodiment, the switch 802 is a jog switch and is set to normally open, that is, the switch 802 is in the open state in the normal state, and is closed when it is pressed. When the press is canceled, the switch 802 automatically returns to off. Open state.

The operating principle of the dimmer will be described below with reference to FIG. 16A.

The switch 801 is closed, and the LED lighting system 10 works normally. The dimming can be performed by closing and opening the switch 802. The switch 802 is set to be normally open. When the switch 802 is closed, the dimming signal Sdim0 is in a high-level state; when the switch 802 is open, the dimming signal Sdim0 is in a low-level state. The dimmer 80 converts the switch state of the switch 802 into a dimming signal Sdim0, the demodulation module 140 receives the dimming signal Sdim0 and demodulates the dimming information therein, and converts it into a dimming control for the LED driving module LD Signal Sdc.

When the switch 802 is continuously closed, the LED light gradually brightens from the current brightness, and the speed of the brightness change can be set by the internal device parameters of the LED light; when the switch 802 is closed for a short time t1 and then opened, when the switch 802 is closed again after the time t1` , LED lights gradually dim from the current brightness. The time t1, t1' and the speed of the LED lamp brightness change can be set by the internal device parameters of the LED lamp. In other embodiments, the switch 802 can be set to be a normally closed switch or a dynamic off switch, and the switching action of the switch 802 can also be used to realize the dimming operation, and the present invention is not limited to this.

In other embodiments, the switch 802 is a jog switch and is set to be normally closed. When the switch 802 is not pressed, the switch 802 is in the closed state. When the dimming operation is performed, the switch 802 is pressed and the switch 802 is opened. When the pressing is cancelled, the switch 802 automatically returns to the closed state, that is, the switch When the switch 802 is not pressed, the switch 802 is in the closed state, and when the switch 802 is pressed, the switch 802 is in the open state.

Refer to FIG. 15B for a schematic circuit diagram of a dimmer according to another embodiment of the present invention. The dimmer 80 includes

switches

801 and 803 and a switch 804. The switch 803 and the switch 804 are connected in parallel and connected in series with the switch 801, that is, the first pin of the switch 801 is electrically and electrically connected to the external power signal input terminal L, and the first pin of the switch 803 and the first pin of the switch 804 are electrically connected. It is connected and electrically connected to the second pin of the switch 801, the second pin of the switch 803 is electrically connected to the LED driving module LD, and the second pin of the switch 804 is electrically connected to the LED driving module LD. The switch 801 is used as a switch of the entire system, which is the same as the embodiment described in FIG. 15A, and will not be repeated here. The switch 803 and the switch 804 are used for dimming operation. In this embodiment, the switch 803 and the switch 804 are inching switches, and they are set to be normally closed, that is, in the normal state, the switch 803 and the switch 804 are in the closed state, when pressed, the switch is open, and when the pressing is cancelled , The switch automatically returns to the closed state.

The operation principle of the dimmer 80 in this embodiment will be described below with reference to FIG. 16B.

The switch 801 is closed, and the LED lighting system 10 works normally. When the dimming operation is not performed, since the switch 803 and the switch 804 are in the closed state, the external power signal can supply power to the LED lamp through the power supply loop formed by the

switches

801 and 803, or the power supply loop formed by the

switches

801 and 804. The lamp is powered. At this time, the dimming signals Sdim1 and Sdim2 are both high. When the dimming operation is performed and the switch 803 or the switch 804 is pressed, the dimming signal Sdim1 or Sdim2 is low. It should be noted here that when the dimming operation is performed, the switch 803 and the switch 804 cannot be pressed at the same time. When the switch 803 and the switch 804 are pressed at the same time, the power supply circuit of the external power signal is disconnected, and the power supply of the LED light cannot be continued. In this embodiment, a linked mechanical structure is provided in the switch 803 and the switch 804 to prevent the switch 803 and the switch 804 from being turned off at the same time. In the

switches

803 and 804, when only the switch 803 is active, the external power signal can supply power to the LED lights through the power supply loop formed by the switch 801 and the switch 804; when only the switch 804 is active, the external power signal can be passed through the switch 801 and the switch The power supply loop formed by 803 supplies power to the LED lights.

The dimmer 80 dims the LED lamp through the dimming signals Sdim1 and Sdim2 generated by the switch 803 and the switch 804. When the switch 803 is continuously pressed, the brightness of the adjusted LED light gradually becomes brighter from the current brightness. When the pressing of the switch 803 is cancelled, the dimming of the LED light ends, and the LED light maintains the current brightness value; When the 804 is continuously pressed, the brightness of the adjusted LED light is continuously dimmed from the current brightness. When the pressed state of the switch 804 is cancelled, the LED light maintains the current brightness value. The speed at which the LED light turns bright or dark is set by the internal device parameters of the LED light.

Furthermore, the dimmer 80 can generate a color adjustment signal through the switch 803 and the switch 804 to color the LED light. Combined with the color signal schematic diagram of Figure 16C, when the switch 803 is briefly pressed for a time t3 and raised, and then pressed again after the time t3`, the color temperature of the LED light gradually becomes warmer from the current color temperature. When the pressing of the switch 803 is cancelled, the LED The color adjustment of the light ends, and the LED light maintains the current color temperature. When the switch 804 is briefly pressed for a time t3 and lifted up, and then pressed again after the time t3`, the color temperature of the LED light gradually becomes warmer from the current color temperature. When the switch 804 is canceled, the color adjustment of the LED light ends and the LED light remains To the current color temperature. The time t2, t3, t3' and the speed of the color temperature change of the LED light can be set by the internal device parameters of the LED light. In this embodiment, the dimming parameter of the switch 803 and the dimming parameter of the switch 804 are the same. In other embodiments, the switch 803 and the switch 804 can set different dimming parameters, and the present invention is not limited to this.

Refer to FIG. 7F for a schematic circuit diagram of a demodulation module according to an embodiment of the present invention. The demodulation module 140 includes a diode 141,

resistors

142 and 143, and a logic circuit 144. The demodulation module 140 in this embodiment can be applied to the embodiment shown in FIG. 15A. The circuit principle of the demodulation module 140 will now be described with reference to FIG. 15A. The anode of the diode 141 pair is electrically connected to the second pin of the switch 802, and the cathode of the diode 141 is electrically connected to the first pin of the resistor 142. The first pin of the resistor 143 is electrically connected to the second pin of the resistor 142, and the second pin of the resistor 143 is electrically connected to a common ground terminal. The logic circuit 144 is electrically connected to the second pin of the resistor 142, and its output terminal is electrically connected to the LED driving module LD.

When the switch 802 is in the closed state, the external power signal can circulate through the path composed of the power line L, the

switches

801, 802, the diode 141, and the

resistors

142, 143. When the external power signal is AC power, the diode 141 only allows the power signal of the positive half cycle to pass. The resistor 142 and the resistor 143 form a voltage divider circuit. The electrical signal through the diode 141 is divided into voltage to form a signal V1. The logic circuit 144 receives the signal V1 and performs logical operations on the signal V1 to generate a dimming control signal Sdc, and adjust the dimming control signal Sdc. The light control signal Sdc is transmitted to the LED driving module LD, and the LED driving module LD performs dimming according to the received dimming control signal Sdc. In this embodiment, the dimming control signal Sdc can be, for example, a PWM dimming signal. In other embodiments, the dimming control signal Sdc can also be a 0-10V dimming signal, and the present invention is not limited to this.

In other embodiments, the logic circuit can also be referred to as a signal conversion circuit; the diode 141, the resistor 142, and the resistor 143 can be collectively referred to as a sampling circuit.

Refer to FIG. 7G for a schematic circuit diagram of a demodulation module according to another embodiment of the present invention. The demodulation module 240 includes

diodes

241 and 244,

resistors

242, 243, 245 and 246, and a logic circuit 247. The configuration of the demodulation module 240 in this embodiment is similar to the configuration of the demodulation module 140 in the embodiment shown in FIG. 7F. The difference is that a diode 244,

resistors

245 and 246 are added in this embodiment. . The demodulation module 240 in this embodiment can be applied to the embodiment described in FIG. 15B. The working mode of the demodulation module 240 will be described below in conjunction with FIG. 15B. The anode of the diode 241 is electrically connected to the second pin of the switch 803, the cathode of the diode 241 is electrically connected to the first pin of the resistor 242, and the first pin of the resistor 243 is electrically connected to the second pin of the resistor 242. The second pin is electrically connected to a common ground terminal. The anode of the diode 244 is electrically connected to the second pin of the switch 804, the cathode of the diode 244 is electrically connected to the first pin of the resistor 245, and the first pin of the resistor 246 is electrically connected to the second pin of the resistor 245. The second pin is electrically connected to a common ground terminal.

When the switch 803 is in the closed state, the external power signal can circulate through the path composed of the power input terminal L, the switch 803, the diode 241, and the

resistors

242 and 243. When the external power signal is AC power, the diode only allows the positive half-cycle power signal to pass. The resistor 242 and the resistor 243 form a voltage divider circuit. The power signal passing through the diode 241 is divided by the resistor 242 and the resistor 243 to form a signal V2, and the logic circuit 247 receives the signal V2; similarly, when the switch 804 is in the closed state, A signal V3 is formed at the common end of the resistor 245 and the resistor 246, and the logic circuit 247 receives the signal V3. The logic circuit 247 performs logic operations after receiving the signals V2 and V3, and outputs a dimming control signal Sdc to the LED driving module LD. The LED driving module LD performs dimming according to the received dimming control signal Sdc. In this embodiment, the dimming signal Sd may be, for example, a PWM dimming signal. In other embodiments, the dimming signal Sd may also be a 0-10V dimming signal, and the present invention is not limited to this.

In other embodiments, the logic circuit can also be referred to as a signal conversion circuit; the

diodes

241, 244, the

resistors

242, 243, 345, and the resistor 246 can be collectively referred to as sampling circuits.

6A and 6B are schematic diagrams of functional modules of LED lighting devices according to some embodiments of the present disclosure. Please refer to FIG. 6A first, the LED lighting device 100 of this embodiment can be applied to the

LED lighting system

10 or 20 as shown in FIG. 1A or FIG. 1B. The LED lighting device 100 includes a power module PM and an LED module LM, where the power module PM includes a rectifier circuit 110, a filter circuit 120, a drive circuit 130, and a demodulation module 140.

Refer to FIG. 12A for a schematic diagram of a circuit structure of a rectifier circuit according to an embodiment of the present invention. The rectifier circuit RC1 is a full-bridge rectifier circuit, which includes a diode D1, a diode D2, a diode D3, and a diode D4. The anode of diode D1 is connected to the anode of diode D4 and connected to terminal b2, the cathode of diode D2 is connected to the cathode of diode D3 and connected to terminal b1, and the cathode of diode D1 is connected to the anode of diode D2 and connected to terminal a1 , The anode of the diode D3 and the cathode of the diode D4 are connected and connected to the terminal a2. The terminals a1 and a2 are the input terminals of the rectifier circuit RC1, and the terminals b1 and b2 are the output terminals of the rectifier circuit RC1.

When the signal input from the input end of the rectifier circuit RC1 is an AC signal, the DC signal can be output after being rectified by the rectifier circuit RC1. When the level of input terminal a1 is greater than that of input terminal a2, the signal will flow in through input terminal a1, diode D2, rectifier circuit output terminal b1, and flow out through rectifier circuit output terminal b2, diode D4, and input terminal a2. When the level of the input terminal a2 is greater than the level of the input terminal a1, the signal will flow in through the input terminal a2, the diode D3, and the output terminal b1 of the rectifier circuit, and flow out through the output terminal b2 of the rectifier circuit, the diode D1, and the dimmer output terminal 80a. Therefore, the level of the output terminal b1 of the rectifier circuit is always higher than the level of the output terminal b2 of the rectifier circuit, and the rectifier circuit can output a DC signal.

Refer to FIG. 12B for a schematic diagram of the circuit structure of a rectifier circuit according to another embodiment of the present invention. The rectifier circuit RC2 includes a diode D5. The diode D5 is connected in series between the input terminal a1 and the output terminal b1. The input terminal a2 and the output terminal b2 are electrically connected. When the level of input terminal a1 is higher than the level of input terminal a2, the power signal flows in through input terminal a1, diode D5, and output terminal b1, and flows out through output terminal b2 and input terminal a2; when the level of input terminal a2 is higher than When the level of the input terminal a1, a current path cannot be formed. Therefore, when the signals input by the input terminals a1 and a2 are alternating current, the rectifier circuit RC2 only allows the signal whose signal is a positive half cycle to pass, and a half-wave rectified signal is obtained.

The rectifier circuit 110 is electrically connected to the first power supply terminal T1 and the second power supply terminal T2 of the dimmer 80 through the first connection terminal 101 and the second connection terminal 102, respectively, to receive the modulated power Pin_C and rectify the modulated power Pin_C , And then the rectified signal Srec is output from the first rectified output terminal 111 and the second rectified output terminal 112. Here, the modulating power Pin_C can be an AC signal or a DC signal, which does not affect the operation of the LED lighting device 200. When the LED lighting device 200 is designed to light up based on a DC signal, the rectifier circuit 110 in the power module PM may be omitted. In the configuration where the rectifier circuit 110 is omitted, the first connection terminal 101 and the second connection terminal 102 are directly electrically connected to the input terminals (ie, 111 and 112) of the filter circuit 120.

In this embodiment, the rectifier circuit 110 may adopt the circuit structure of FIG. 12A or 12B. Further, the terminal a1 is electrically connected to the first connection terminal 101, and the terminal a2 is electrically connected to the second connection terminal 102 for receiving The signals at terminals a1 and a2 are rectified to generate a rectified signal. For the operating principle of the rectifier circuit 110, refer to the description of FIGS. 12A and 12B, which will not be repeated here.

In some embodiments, the rectifier circuit 110 may be a full-wave rectifier circuit, a half-wave rectifier circuit, a bridge rectifier circuit, or other types of rectifier circuits, and the disclosure is not limited thereto.

The filter circuit 120 is electrically connected to the rectifier circuit 110 to filter the rectified signal Srec; that is, the input terminal of the filter circuit 220 is coupled to the first rectified output terminal 111 and the second rectified output terminal 112 to receive the rectified output terminal 111 Signal Srec, and filter the rectified signal Srec. The filtered signal Sflr is output from the first filtered output terminal 121 and the second filtered output terminal 122. The first rectified output terminal 111 can be regarded as the first filter input terminal of the filter circuit 120, and the second rectified output terminal 112 can be regarded as the second filter input terminal of the filter circuit 120. In this embodiment, the filter circuit 120 can filter out ripples in the rectified signal Srec, so that the waveform of the generated filtered signal Sflr is smoother than the waveform of the rectified signal Srec. In addition, the filter circuit 120 can filter a specific frequency through a selection circuit configuration, so as to filter out the response/energy of the external driving power supply at the specific frequency. In some embodiments, the filter circuit 120 may be a circuit composed of at least one of a resistor, a capacitor, and an inductance, such as a parallel capacitor filter circuit or a π-type filter circuit, and the disclosure is not limited thereto. When the LED lighting device 100 is designed to light up based on a DC signal, the filter circuit 120 in the power module PM can also be omitted. In the configuration where the rectifier circuit 110 and the filter circuit 120 are omitted, the first connection terminal 101 and the second connection terminal 102 are directly electrically connected to the input terminals (i.e., 121, 122) of the driving circuit 130.

The filter circuit 120 in this embodiment may use the filter circuit FC1 or FC2 in FIG. 12C or 12D. Further, the terminal c1 is electrically connected to the first rectification output terminal 111, the terminal c2 is electrically connected to the second rectification output terminal 112, and the terminals d1 and d2 are electrically connected to the driving circuit 130, respectively.

The driving circuit 130 is electrically connected to the filter circuit 120 to receive the filtered signal Sflr and perform power conversion on the filtered signal Sflr to generate a driving power Sdrv; that is, the input terminal of the driving circuit 130 is coupled to the first filtered output The terminal 121 and the second filtering output terminal 122 receive the filtered signal Sflr, and then generate a driving power Sdrv for driving the LED module LM to emit light. Among them, the first filter output terminal 121 can be regarded as the first driving input terminal of the driving circuit 130, and the second filter output terminal 122 can be regarded as the second driving input terminal of the driving circuit 130. The driving power Sdrv generated by the driving circuit 130 is provided to the LED module LM through the first driving output terminal 130a and the second driving output terminal 130b, so that the LED module LM can be lit in response to the received driving power Sdrv. The driving circuit 130 of this embodiment may also be a power conversion circuit including a switching control circuit and a conversion circuit. For specific configuration examples, please refer to the description of the embodiments in FIG. 4A and FIG. 4B, which will not be repeated here.

The input terminal of the demodulation module 140 is electrically connected to the first connection terminal 101 and the second connection terminal 102 to receive the modulated power Pin_C, and the output terminal of the demodulation module 140 is electrically connected to the driving circuit 130 to provide the dimming control signal Sdc. The demodulation module 140 parses/demodulates the brightness information from the modulated power Pin_C, and generates a corresponding dimming control signal Sdc according to the brightness information, wherein the driving circuit 130 adjusts the output drive according to the dimming control signal Sdc The size of the power supply Sdrv. For example, in the driving circuit 130, the switching control circuit (such as 72) can adjust the duty cycle of the power switch PSW according to the dimming control signal Sdc, so that the driving power Sdrv responds to the brightness information indicated by the dimming control signal Sdc. increase or decrease. When the dimming control signal Sdc indicates a higher luminous brightness or color temperature, the switching control circuit can increase the duty cycle based on the dimming control signal Sdc, so that the power conversion circuit ESE outputs a higher driving power Sdrv to the LED module LM Conversely, when the dimming control signal Sdc indicates a lower light-emitting brightness or color temperature, the switching control circuit can lower the duty cycle based on the dimming control signal Sdc, so that the power conversion circuit ESE outputs a lower driving power Sdrv Give the LED module LM. In this way, the effect of dimming control can be achieved.

In some embodiments, the LED module LM can also be dimmed by controlling a circuit other than the driving circuit 130. For example, please refer to FIG. 6B. In the power supply module 200 of FIG. The actions of driving the power source and the actions of demodulating the dimming information from the modulated power Pin_C are similar to the embodiment of FIG. 6A. The difference is that in the embodiment of FIG. 6B, the power module PM further includes a dimming switch 150. The dimming switch 150 turns on or cuts off the driving power Sdrv according to the dimming control signal Sdc to generate the intermittent dimming power Sdrv to be supplied to the LED module LM to dimming the LED module LM. In some embodiments, the dimming control signal Sdc generated by the demodulation module 140 may be a signal in the form of pulse width modulation (PWM), so as to control the dimming switch 150 to be turned on intermittently to realize the PWM dimming effect.

FIG. 6C is a schematic block diagram of a driving circuit according to an embodiment of the disclosure. 6A and 6C together, the driving circuit 130 is an embodiment of the driving circuit 130 of FIG. 6A, which includes a switching control circuit 131 and a conversion circuit 132, which performs power conversion in a current source mode to drive the LED module LM Glow. The conversion circuit 132 includes a switch circuit (also referred to as a power switch) PSW and a tank circuit ESE. The conversion circuit 132 is coupled to the first filter output terminal 121 and the second filter output terminal 122, receives the filtered signal Sflr, and according to the control of the switching control circuit 131, converts the filtered signal Sflr into a driving power supply Sdrv to be output by the first driver The terminal 130a and the second driving output terminal 130b output to drive the LED module LM. Under the control of the switching control circuit 131, the driving power output from the conversion circuit 132 is a stable current, so that the LED filament module emits light stably. In addition, the driving circuit 130 may also include a bias circuit 133, which can generate a working voltage Vcc based on the bus voltage of the power supply module, and the working voltage Vcc is provided to the switching control circuit 131 to control the switching The circuit 131 can be activated and operated in response to the operating voltage.

The switching control circuit 131 of this embodiment can adjust the duty cycle of the output lighting control signal Slc in real time according to the current working state of the LED module LM, so that the switching circuit PSW reacts to the lighting control signal Slc. On or off. Wherein, the switching control circuit 131 can detect the input voltage (which can be the level on the first connection terminal 101/second pin 102, the level on the first rectification output terminal 111, or the level on the first filter output terminal 121 Level), output voltage (which can be the level on the first drive output terminal 130a), input current (which can be the bus current, that is, the current flowing through the rectified output terminal 111/112 and the filtered output terminal 121/122), and At least one or more of the output current (which may be the current flowing through the driving output terminals 130a/130b, the current flowing through the energy storage circuit ESE, or the current flowing through the switching circuit PSW) is used to determine the current working state of the LED module LM. The energy storage circuit ESE repeatedly charges/discharges according to the on/off state of the switch circuit PSW, so that the driving power Sdrv received by the LED module LM can be stably maintained at a preset current value Ipred.

The input terminal of the demodulation module (140) is electrically connected to the first connection terminal 101 and the second connection terminal 102 to receive the modulated power Pin_C, and the output terminal of the demodulation module 140 is electrically connected to the driving circuit 130 to provide a dimming control signal Sdc. The demodulation module 140 generates a corresponding dimming control signal Sdc according to the phase cut angle/conduction angle of the modulated power Pin_C in each cycle or half cycle, wherein the switching control circuit 131 adjusts the dimming control signal Sdc The output of the lighting control signal Slc further causes the driving power supply Sdrv to change in response to the change of the lighting control signal Slc. For example, the switching control circuit 131 can adjust the duty cycle of the lighting control signal Slc according to the dimming control signal Sdc, so that the driving power Sdrv increases or decreases in response to the brightness information indicated by the lighting control signal Slc. When the dimming control signal Sdc indicates a higher luminous brightness or color temperature, the switching control circuit 131 will increase the duty cycle based on the dimming control signal Sdc, so that the conversion circuit ESE outputs a higher driving power Sdrv to the LED module LM Conversely, when the dimming control signal Sdc indicates a lower light-emitting brightness or color temperature, the switching control circuit 131 will lower the duty cycle based on the dimming control signal Sdc, thereby causing the conversion circuit ESE to output a lower driving power Sdrv Give the LED module LM. In this way, the effect of dimming control can be achieved.

More specifically, the demodulation processing performed by the demodulation module 140 for the modulated power supply Pin_C may be, for example, signal conversion means such as sampling, counting, and/or mapping. For example, the demodulation module 140 can sample and count the zero-level duration of the modulated power supply Pin_C in each cycle or half cycle of the modulated power supply Pin_C, where the counted zero-level duration can be linearly or non-linearly The mapping is a level, and the mapped level can be provided to the switching control circuit 131 as a dimming control signal Sdc. Wherein, the mapped level range can be selected based on the processing range of the switching control circuit 131, and it can be, for example, 0V-5V. Next, FIG. 8D is used to further illustrate the signal waveforms and circuit operations of the LED lighting system of the present disclosure in different dimming states. FIG. 8D is a schematic diagram of the dimming waveforms of an embodiment of the present disclosure.

More specifically, the demodulation processing performed by the demodulation module 140 for the modulated power Pin_C may be, for example, signal conversion means such as sampling, counting, and/or imaging. 7A to 7C are used to further illustrate the configuration and circuit operation of the demodulation module 140 of the present disclosure. FIG. 7A is a schematic diagram of functional modules of the demodulation module of some embodiments of the present disclosure, and FIGS. 7B and 7C are some implementations of the present disclosure. The schematic diagram of the circuit structure of the LED lighting device of the example.

Please refer to FIG. 7A first. The demodulation module 140 of this embodiment includes a sampling circuit 141 and a signal conversion circuit 145. The sampling circuit 141 receives the modulated power supply Pin_C, and is used to collect/retrieve brightness information from the modulated power supply Pin_C, and accordingly generate a brightness indicator signal Sdim' corresponding to the dimming signal (such as Sdim) in the dimmer . The signal conversion circuit 145 is electrically connected to the sampling circuit 141 to receive the brightness indicating signal Sdim', and is used to generate a dimming control signal Sdc for controlling the subsequent circuit according to the brightness indicating signal Sdim'. The signal format of the dimming control signal Sdc will be designed or adjusted according to the type of the subsequent circuit; for example, if the demodulation module 140 realizes the dimming function by controlling the driving circuit 130, the dimming control signal Sdc can be, for example, a signal whose level, frequency, and pulse width are proportional to the dimming information; if the demodulation module 140 controls the dimming switch 150 to realize the dimming function, the dimming control signal Sdc may be, for example, a signal whose pulse width is proportional to the dimming information.

7B and 7C are used to illustrate specific examples of the demodulation module 140 according to some embodiments of the disclosure. Referring to FIG. 7B first, in the power supply module of this embodiment, the driving circuit 130 includes a switching control circuit 131 and a conversion circuit 132, and the demodulation module 140 includes a sampling circuit 141 and a signal conversion circuit 145a. In the driving circuit 130, the conversion circuit 132 includes a resistor R41, an inductor L41, a freewheeling diode D41, a capacitor C41, and a transistor M41. The connection configuration between the above-mentioned components is similar to that of the resistor R21, the inductor L21, and the continuation of the embodiment of FIG. 4B. The flow diode D21, the capacitor C21 and the transistor M21 are not repeated here. The sampling circuit 141 includes a coupling circuit 142. The coupling circuit 142 is electrically connected to the first connection terminal 101, the second connection terminal 102 and the signal conversion circuit 145a, and is used to filter the DC component of the modulated power supply Pin_C, and then extract the dimming information in the modulated power supply Pin_C. The coupling circuit 142 can be implemented with a capacitor C51, for example.

In some embodiments, the sampling circuit 141 further includes a plurality of electronic components for voltage stabilization or level adjustment, such as resistors R51-R53 and a Zener tube ZD51. One end of the capacitor C51 is electrically connected to the first connection terminal 101. The resistor R51 is electrically connected between the other end of the capacitor C51 and the second connection terminal 102. One end of the resistor R52 is electrically connected to the connecting end of the capacitor C51 and the resistor R1, and the other end of the resistor R52 is electrically connected to the signal conversion circuit 145a. The resistor R53 is electrically connected between the other end of the resistor R52 and the second connection terminal 102. The voltage regulator tube ZD51 is connected in parallel with the resistor R51. Under the above configuration, the signal on the connecting end of the resistors R52 and R53 can be regarded as the brightness indicating signal Sdim'.

The signal conversion circuit 145a generates a dimming control signal Sdc with corresponding frequency, voltage, and duty cycle based on the brightness information indicated by the brightness indicator signal Sdim', and provides it to the switch control circuit 131, so that the switch control circuit 131 can control the light according to the dimming control. The signal Sdc generates a one-point light control signal Slc to adjust the switching behavior of the transistor M41, and thereby the driving power Sdrv generated by the driving circuit 130 changes in response to the brightness information. In other embodiments, the lighting control signal may also be referred to as a dimming indicator signal.

9A and 9B are used to illustrate the operation of the above-mentioned demodulation module 140, wherein FIGS. 9A and 9B are schematic diagrams of signal waveforms of the LED lighting device according to some embodiments of the disclosure. Similar to the foregoing embodiment, the brightness of the LED module is adjusted to 30% and 70% of the maximum brightness as an example, but the disclosure is not limited to this. Please refer to FIG. 7B, FIG. 9A and FIG. 9B at the same time, when the LED device receives a modulated power supply Pin_C with a DC component (such as a DC set voltage Vset) and an AC component (such as a pulse based on the set voltage Vset) On the one hand, the driving circuit 130 will start in response to the modulated power Pin_C and perform power conversion to generate the driving power Sdrv; on the other hand, the demodulation module 140 will couple the AC component of the modulated power Pin_C through the capacitor C51, and through the resistor R51 -R53 and Zener tube ZD51 perform voltage division and voltage stabilization to generate the brightness indicator signal Sdim'. Wherein, the brightness indicating signal Sdim' may for example have a pulse waveform, and each pulse is a signal that is approximately synchronized with the AC component in the modulated power supply Pin_C. The dimming information/brightness information given by the dimmer can be regarded as included in the frequency information of the brightness indicating signal Sdim'. As shown in FIGS. 9A and 9B, the frequency of the brightness indicating signal Sdim' indicating 30% brightness will be lower than that of the brightness indicating signal Sdim' indicating 70% brightness, that is, the period T1 of the brightness indicating signal Sdim' indicating 30% brightness will be It is greater than the period T2 of the brightness indicating signal Sdim' indicating 70% brightness.

The brightness indicator signal Sdim' triggers the signal conversion circuit 145a to generate a square wave with a fixed pulse width PW as the dimming control signal Sdc. In FIGS. 9A and 9B, it is shown that the signal conversion circuit 145a triggers the generation of a square wave based on the rising edge of the brightness indicator signal Sdim' as an example, but the present disclosure is not limited to this. In other embodiments, the signal conversion circuit 145a can also be triggered based on the falling edge of the brightness indicating signal Sdim', or based on determining whether the voltage of the brightness indicating signal Sdim' reaches a specific value. In addition, since the square wave in the dimming control signal Sdc is generated based on the pulse of the brightness indicating signal Sdim', the frequency of the dimming control signal Sdc is basically the same as the brightness control signal Sdim'.

Through the above-mentioned signal conversion action, when the switching control circuit 131 receives the dimming control signal Sdc indicating 30% of the maximum brightness, the switching control circuit 131 will reduce the duty cycle of the transistor M41 to reduce the current value of the driving power supply Sdrv to 30% of the rated current value; when the switching control circuit 131 subsequently receives the dimming control signal Sdc indicating 70% of the maximum brightness, the switching control circuit 131 will increase the duty cycle of the transistor so that the current value of the driving power supply Sdrv is lower than the rated current value. The 30% of the current value rises to 70%, thereby realizing the dimming effect.

7C, this embodiment illustrates another configuration of the demodulation module 140. The configuration of this embodiment is roughly the same as the previous embodiment of FIG. 7B. The main difference is that the sampling circuit 141 of this embodiment further includes a transistor M51. And resistor R54, and the signal conversion circuit is implemented as a signal conversion circuit 145b triggered by a falling edge, wherein the transistor M51 and the resistor R54 are used to form a signal inversion module to reverse the signal on the connecting end of the resistors R52 and R53. Phase and output the brightness indicating signal Sdim'. The transistor M51 and the resistor R54 may be referred to as a signal conversion circuit.

Specifically, the transistor M51 has a first terminal, a second terminal, and a control terminal. The first terminal is electrically connected to the signal conversion circuit 145b, and the second terminal is electrically connected to the second connection terminal 102 (also regarded as the ground terminal GND2). ), and its control terminal is electrically connected to the connecting terminals of resistors R52 and R53. One end of the resistor R54 is electrically connected to the bias power supply Vcc2 (which may be divided from the busbar, for example), and the other end of the resistor R54 is electrically connected to the first end of the transistor M51, wherein The signal can be regarded as the brightness indicating signal Sdim'.

In the embodiment of FIG. 7C, the signal on the connecting end of the resistors R52 and R53 will be used as the control signal of the transistor M51. When the control signal is at a high level, the transistor M51 is turned on, so that the first terminal of the transistor M51 can be regarded as being short-circuited to the ground terminal GND2, so the brightness indicator signal Sdim' will be pulled down to a low level (ground level) When the control signal is low, the transistor M51 is turned off, so the brightness indicator signal Sdim' will be pulled up to a high level (bias power supply Vcc2). In other words, the signal level of the brightness indicating signal Sdim' and the signal level on the connecting end of the resistors R52 and R53 are inverse to each other.

9C and 9D are used to illustrate the operation of the demodulation module 140, wherein FIGS. 9C and 9D are schematic diagrams of signal waveforms of the LED lighting device according to some embodiments of the disclosure. Similar to the foregoing embodiment, the brightness of the LED module is adjusted to 30% and 70% of the maximum brightness as an example, but the disclosure is not limited to this. Please refer to FIGS. 7C, 9C, and 9D at the same time, when the LED device receives a modulated power supply Pin_C with a DC component (for example, a DC set voltage Vset) and an AC component (for example, a pulse based on the set voltage Vset) On the one hand, the driving circuit 130 will start in response to the modulated power Pin_C and perform power conversion to generate the driving power Sdrv; on the other hand, the demodulation module 140 will couple the AC component of the modulated power Pin_C through the capacitor C51, and through the resistor R51 -R53 and Zener tube ZD51 are divided and stabilized to generate the control signal of transistor M51. The transistor M51 is switched to affect the signal state on its first terminal to form the brightness indicating signal Sdim'. Wherein, the brightness indicating signal Sdim' may have an inverted pulse waveform (that is, the reference level is high, and the pulse period is switched to low), and each pulse will be approximately synchronized with the AC component in the modulating power supply Pin_C signal of. The dimming information/brightness information given by the dimmer can be regarded as included in the frequency information of the brightness indicating signal Sdim'.

The brightness indicator signal Sdim' triggers the signal conversion circuit 145b to generate a square wave with a fixed pulse width PW as the dimming control signal Sdc. In FIGS. 9C and 9D, it is shown that the signal conversion circuit 145b generates a square wave based on the rising edge of the brightness indicator signal Sdim' as an example, but the present disclosure is not limited to this.

Since the demodulation module 140 only uses the AC component in the modulated power supply Pin_C as the trigger of the dimming control signal Sdc, instead of directly controlling the dimming behavior of the driving circuit 130 based on this signal, even if the dimmer 80 is affected by other When the modulated power supply Pin_C fluctuates or becomes unstable due to unexpected factors, as long as the signal pulse can be identified, the demodulation module 140 can ensure that the dimming control will not malfunction due to voltage fluctuations. Reliability of LED lighting device.

In other embodiments, the sampling circuit 141 may be referred to as a signal analysis module, and the signal conversion circuit 145 may be referred to as a signal generation module. The driving circuit 130 may be referred to as a power conversion module.

In other embodiments, the signal conversion circuit 145 includes a trigger circuit, and the trigger circuit is coupled to the sampling circuit 141 for receiving the sampling circuit 141 to receive the brightness indicating signal Sdim'. For example, when the trigger circuit detects the rising edge signal in the brightness indicator signal Sdim', it triggers a pulse with a pulse width Th, and the pulse width Th can be set by the internal device of the trigger. The converted signal is the dimming control signal Sdc. The frequency of the dimming control signal Sdc is consistent with the brightness indicator signal Sdim', and the pulse width is Th.

Please refer to FIGS. 7D and 7E at the same time. FIG. 7D is a schematic block diagram of a specific embodiment of the demodulation module 240 in the LED lighting device of an embodiment of the present disclosure. FIG. 7E is a schematic block diagram of a specific embodiment of the LED lighting device of an embodiment of the present disclosure. , A schematic diagram of the corresponding relationship between the waveforms of the demodulation module. As shown in FIG. 7D, in an embodiment, the demodulation module 240 includes a level judgment circuit 241, a sampling circuit 242, a counting circuit 243, and a mapping circuit 244. The level judging circuit 241 is used to detect whether the modulated power supply Pin_C is within the threshold interval VTB0 to determine whether the modulated power supply Pin_C is at zero level. Specifically, as shown in FIG. 7E, in one embodiment, the level The judging circuit 241 compares the level of the power supply Pin_C with the upper threshold Vt1 and the lower threshold Vt2, thereby judging whether the modulated power supply Pin_C is within the threshold interval VTB0. When the modulated power supply Pin_C is indeed within the threshold interval VTB0, the level judging circuit 241 The zero-level determination signal S0V with the first logic level (for example, a high logic level) is output to indicate that the modulated power supply Pin_C is indeed within the threshold interval VTB0. The sampling circuit 242 is used to sample the zero-level determination signal S0V according to the clock signal CLK to generate a sampling signal Spls in the form of a pulse wave, wherein, when the sampled zero-level determination signal S0V is at a high logic level (representing the adjustment The variable power supply Pin_C is indeed within the threshold interval VTB0), the sampling signal Spls outputs a pulse wave, and then the counting circuit 243, for example, counts the pulse wave of the sampling signal Spls within a period of 1/2 mains (for example, corresponding to 50 Hz or 60 Hz) According to the ratio of the count signal Scnt (indicating the number of pulses of the sampling signal Spls) to the total number of the clock signal CLK in the cycle of 1/2 mains, the mapping circuit 244 generates the count signal Scnt as described above. The dimming control signal Sdc mentioned above. The reset signal RST is synchronized with 1/2 of the period of the mains power supply and is used to reset the counting circuit. It should be noted that the dimming control signal Sdc in this disclosure is not on the power circuit of the LED module LM and the driving power supply Sdrv. In other words, the dimming control signal Sdc is not used to directly drive the power supply of the LED module LM. From another perspective, the current or power of the dimming control signal Sdc is much smaller than the current or power of the driving power source Sdrv. Specifically, in some embodiments, the current or power of the dimming control signal Sdc is far less than 1/10, 1/100, or 1/100 of the current or power of the driving power source Sdrv.

10A and 10B are a flowchart of steps of a dimming control method of an LED lighting device according to some embodiments of the present disclosure. The dimming control method described here can be applied to the LED lighting system or the LED lighting device described in any of the above-mentioned embodiments of FIGS. 1 to 7C. Referring to FIG. 10A first, in the dimming control method of this embodiment, the power supply module in the LED lighting device converts the input power, and generates driving power for the LED module (step S110). On the other hand, the demodulation module in the LED lighting device captures the signal characteristics of the input power (step S120). Then the demodulation module demodulates the captured signal characteristics, thereby extracting the brightness information, and generating the corresponding dimming control signal (step S130). Then the power module adjusts the power conversion operation with reference to the dimming control signal generated by the demodulation module, so as to adjust the size of the driving power in response to the brightness information (step S140).

In some embodiments, steps S120 to S140 may be further implemented according to the control method described in FIG. 10B. Referring to FIG. 10B, in this embodiment, the demodulation module can generate the first characteristic signal by filtering out the DC component of the input power (step S220). The first characteristic signal described here can be implemented as described above. The brightness indicator signal Sdim' mentioned in the example. Then, the demodulation module triggers the generation of a dimming control signal based on the rising edge or the falling edge of the first characteristic signal (step S230), and makes the switching control circuit in the power module adjust according to the duty cycle of the dimming control signal The size of the driving power source (step S240).

FIG. 10C is a flowchart of steps of a dimming control method of an LED lighting system according to an embodiment of the disclosure. Please refer to FIG. 1A and FIG. 10C together. Here, the overall dimming control method is described from the perspective of the LED lighting system 10. First, the dimmer 80 modulates the input power Pin according to the dimming command DIM, and generates a modulated power Pin_C accordingly (step S310), wherein the modulated power Pin_C has a signal characteristic indicating dimming information, and The signal characteristic can be, for example, the phase tangent angle/conduction angle of the modulated power supply Pin_C. The modulated power Pin_C is provided to the LED lighting device 100, so that the LED lighting device 100 performs power conversion based on the modulated power Pin_C and lights the internal LED module (step S320). On the other hand, the LED lighting device 100 extracts signal characteristics from the modulated power Pin_C (step S330), and demodulates the captured signal characteristics, so as to extract the corresponding dimming information (step S340). Then, the LED lighting device 100 refers to the demodulated dimming information to adjust the power conversion operation, so as to change the light-emitting brightness or color temperature of the LED module (step S350).

More specifically, in conjunction with FIG. 6A, the above-mentioned operations of capturing signal characteristics (step S330) and demodulating and modulating the power supply Pin_C (step S340) can be implemented by the demodulation module 140 in the LED lighting device 100/200. In one embodiment, the LED lighting device 100 performs power conversion based on the modulated power supply Pin_C and lights the internal LED module (step S320) and adjusts the power conversion operation with reference to the dimming information, thereby adjusting the brightness of the LED module. (Step S350) can be implemented by the driving circuit 230 in the LED lighting device 100/200.

The following further describes the overall dimming control method from the perspective of the LED lighting device 100, as shown in FIG. 10D. FIG. 10D is a flow chart of the steps of the dimming control method of the LED lighting device according to an embodiment of the disclosure. Please refer to Figure 1A, Figure 6A and Figure 10D together. When the LED lighting device 100 receives the modulated power Pin_C, the rectifier circuit 110 and the filter circuit 120 sequentially rectify and filter the modulated power Pin_C, and accordingly generate a filtered signal Sflr to the driving circuit 130 (step S410). The driving circuit 130 performs power conversion on the received filtered signal Sflr, and generates a driving power Sdrv to provide to the rear LED module (step S420). On the other hand, the demodulation module 140 captures the signal characteristics of the modulated power Pin_C (step S430), and then demodulates the captured signal characteristics to extract dimming information (for example, the angle corresponding to the tangent angle). Size), and generate a corresponding dimming control signal Sdc (step S440). The driving circuit 130 adjusts the power conversion operation with reference to the dimming control signal Sdc, so as to adjust the generated driving power Sdrv in response to the dimming information (step S450), thereby changing the light-emitting brightness or color temperature of the LED module LM.

Furthermore, the dimming control signal Sdc is used to adjust the power conversion operation of the driving circuit 130. In one embodiment, it can be an analog control method. For example, the level of the dimming control signal Sdc can be used to For example, the voltage or current reference value of the driving circuit 130 is controlled in an analog manner, so as to adjust the size of the driving power Sdrv in an analog manner.

In some embodiments, the dimming control signal Sdc is used to adjust the power conversion operation of the driving circuit 130. In one embodiment, it can optionally be a digital control method, for example, the dimming control signal Sdc may have different duty cycles in response to the tangent angle. In this type of embodiment, the dimming control signal Sdc may have, for example, a first state (for example, a high logic state) and a second state (for example, a low logic state). ). In one embodiment, the first state and the second state are used to digitally control the size of the driving power supply Sdrv of the driving circuit 130, for example, the output current is output in the first state, and the output current is stopped in the second state, thereby The LED module LM is dimmed.

Please refer to FIG. 13A (original FIG. 47), which shows a schematic diagram of the circuit structure of the LED module of this application in an embodiment. As shown in the figure, the positive terminal of the LED module LM is coupled to the first driving output terminal of the driving device 130a, the negative terminal is coupled to the second driving output terminal 130b. The LED module LM includes at least one LED unit 200a, and when there are more than two LED units 200a, they are connected in parallel. The positive terminal of each LED unit is coupled to the positive terminal of the LED module LM to be coupled to the first drive output terminal 130a; the negative terminal of each LED unit is coupled to the negative terminal of the LED module LM to be coupled to the first drive output terminal 322. The LED unit 200a includes at least one LED assembly 2000a, that is, the light source of the LED lamp. When there are multiple LED components 2000a, the LED components 2000a are connected in series to form a string, the positive terminal of the first LED component 2000a is coupled to the positive terminal of the corresponding LED unit 200a, and the negative terminal of the first LED component 2000a is coupled to the next (first Two) LED assembly 2000a. The positive terminal of the last LED component 2000a is coupled to the negative terminal of the previous LED component 2000a, and the negative terminal of the last LED component 2000a is coupled to the negative terminal of the corresponding LED unit 200a.

Please refer to FIG. 13B, which shows a schematic diagram of the circuit architecture of the LED module of this application in another embodiment. As shown in the figure, the positive terminal of the LED module LM is coupled to the first driving output terminal 130a, and the negative terminal is coupled to the first driver. The output terminal 130b. The LED module LM of this embodiment includes at least two LED units 200b, and the positive terminal of each LED unit 200b is coupled to the positive terminal of the LED module LM, and the negative terminal is coupled to the negative terminal of the LED module LM. The LED unit 200b includes at least two LED components 2000b. The connection of the LED components 2000b in the LED unit 200b is as described in FIG. 29. The negative electrode of the LED component 2000b is coupled to the positive electrode of the next LED component 2000b, and the The anode of one LED assembly 2000b is coupled to the anode of the associated LED unit 200b, and the cathode of the last LED assembly 2000b is coupled to the cathode of the associated LED unit 200b. Furthermore, the LED units 200b in this embodiment are also connected to each other. The positive electrode of the n-th LED assembly 2000b of each LED unit 200b is connected to each other, and the negative electrode is also connected to each other. Therefore, the connection between the LED components of the LED module LM of this embodiment is a mesh connection. In practical applications, the number of LED components 2000b included in the LED unit 200b is preferably 15-25, and more preferably 18-22.

In addition, it should be noted that although the above embodiments are all described by adjusting the light-emitting brightness of the LED module, it can also be analogized to the adjustment of the color temperature of the LED module. For example, if the above dimming control method is applied to only adjust the driving power provided to the red LED lamp bead (that is, only the light-emitting brightness of the red LED lamp bead is adjusted), the above dimming control method is used. The color temperature adjustment of the LED lighting device can be realized.

1D is a circuit block diagram of a fault detection module according to an embodiment of the present invention. In this embodiment, the LED lighting system 10 further includes a fault detection module 90. The fault detection module 90 is electrically connected to the dimmer 80. Refer to 1A-1C, the LED lamp 100 includes multiple lamps 100_1, 100_2···100_n, and a protection circuit is provided in the dimmer 80. When one or more of the LED lamps 100 fails, the protection of the dimmer is triggered When a circuit or dimming failure causes the entire LED lighting system 10 to be paralyzed, it is difficult for maintenance personnel to determine whether the failure point is the dimmer 80 or the specific malfunctioning lamp. Generally, the maintenance can be carried out by replacing the lamps, but when the LED contains more lamps, it is extremely troublesome to replace. The fault detection module 90 can perform maintenance on the LED lighting system 10 by bypassing the dimmer 80.

14A is a schematic diagram of a circuit structure of a fault detection module according to an embodiment of the present invention. The working principle of the fault detection module 90 will be described. The fault detection module 90 includes a switch 901, which is connected in parallel with the dimmer 80, a first pin of the switch 901 is electrically connected to the power input terminal A1, and a second pin of the switch 901 is electrically connected to the dimmer output terminal 80a. When the dimmer 80 malfunctions or the LED lamp 100 malfunctions and the entire lighting system is paralyzed, the switch 901 can be used for malfunction detection. In a normal state, the switch 901 is in an off state, and the dimmer 80 can control the LED lamp 100 normally. When the lighting system fails, close the switch 901. At this time, the dimmer 80 is bypassed by the switch 901, and the external power EP can directly supply power to the LED lamp 100. At this time, if the LED lamp 100 lights up normally, the LED can be eliminated. If the lamp 100 fails, then the dimmer 80 can be overhauled; if one or more of the LED lamps 100 fails to light up due to failure, the other lights can light up normally, and only need to be replaced at this time. The fault light is sufficient. Through this configuration, system failures can be easily detected to determine the location of the failure, which is convenient for maintenance personnel to perform maintenance.

In this embodiment, the switch 901 is a normally open switch, which can be arranged inside the dimmer 80, and can be triggered by a mechanical trigger or a control interface of the dimmer 80. In other embodiments, the dimmer 80 may also be other types of controllers, and the present invention is not limited to this.

14B is a schematic diagram of the circuit structure of a fault detection module according to another embodiment of the present invention. The fault detection module 90 includes a switch 901 and a switch 902. In this embodiment, the dimmer 80 is electrically connected to the power input terminals A1 and A2 for receiving external power signals, and has

dimmer output terminals

80a and 80b. The dimmer output ends 80a and 80b are electrically connected to the LED lamp. The first pin of the switch 901 is electrically connected to the power input terminal A1, and the second pin of the switch 901 is electrically connected to the dimming output terminal 80a. The first pin of the switch 902 is electrically connected to the power input terminal A2, and the second pin of the switch 902 is electrically connected to the dimmer output terminal 80b. In a normal state, the switch 901 and the switch 902 are in an off state, and the dimmer 80 works normally. When the LED lighting system fails and troubleshooting is performed, the

switches

901 and 902 are closed, and the dimmer 80 is bypassed by the

switches

901 and 902. The external power signal can directly supply power to the LED lights through the

switches

901 and 902. At this time, if the LED light 100 is normally lit, the fault of the LED light 100 can be eliminated, and then the dimmer 80 can be overhauled; if one or more of the LED lights 100 cannot be lighted normally due to a failure, the other lights are normal Light up, at this time, just replace the lamp that can't light up. Through this configuration, system faults can be easily detected to determine the location of the fault, which is convenient for maintenance personnel to perform maintenance.

In this embodiment, the switch 901 and the switch 902 are normally open switches, which can be arranged inside the dimmer 80, and can be triggered by mechanical triggering or the control interface of the dimmer 80. In other embodiments, the dimmer 80 may also be other types of controllers, and the present invention is not limited to this.

Refer to FIG. 17 for a schematic diagram of a framework of a lighting system according to another embodiment of the present invention. The lighting system 10 includes an infrared remote controller 50 and a light group 100. The infrared remote controller 50 is a kind of control interface. In this embodiment, the lamp group 100 includes lamps 100_1, 100_2···100_n. An infrared signal receiving device is provided on the lamp to receive the infrared control signal of the infrared remote controller 50 and adjust the brightness of the lamp according to the infrared control signal. The infrared remote controller 50 is used to generate an infrared control signal. Due to the directivity of the infrared signal, when the infrared remote controller 50 is used to dim the light set 100, the lamps 100_1 and 100_2 within the signal range of the infrared remote controller 50 can receive the infrared control signal for dimming. However, other lamps that are not within the signal range of the infrared remote controller 50 cannot receive the infrared control signal, and therefore cannot perform dimming.

In other embodiments, the infrared remote controller 50 can also control the color temperature of the light set 100, and the present invention is not limited to this.

Refer to FIG. 18A for a schematic diagram of a framework of a lighting system according to another embodiment of the present invention. The lighting system 10 in this embodiment is similar to the embodiment shown in FIG. 17, but the difference is that the lighting system 10 in this embodiment further includes an infrared repeater 40. The infrared repeater 40 is arranged between the infrared remote controller 50 and the light group 100. 19A is a schematic diagram of a circuit structure of an infrared repeater according to an embodiment of the present invention. The infrared repeater 40 includes an infrared signal receiving module 41, an infrared signal amplifying module 42, and an infrared signal transmitting module 43. The infrared signal receiving module 41 is used to receive the infrared control signal of the infrared remote controller 50 and transmit it to the infrared signal amplifying module 42. The infrared signal amplifying module 42 performs operational amplification processing on the received infrared control signal, and sends the amplified red control signal to the infrared signal transmitting module 43. The infrared signal transmitting module 43 transmits the amplified infrared control signal. Through this configuration, the infrared repeater 40 amplifies the received infrared control signal, one is to amplify the power intensity of the infrared control signal, and the other is to amplify the coverage angle of the infrared control signal, so that the infrared control signal can cover a larger space , In order to solve the problem of insufficient remote control signal coverage. The infrared control signal amplified by the infrared repeater can cover all lamps in the use scene, so that all lamps can be uniformly dimmed and controlled to increase the consistency of dimming.

In other embodiments, the infrared signal received and amplified by the infrared repeater is not limited to the infrared control signal in the lighting system. Similarly, other infrared control signals may be, for example, infrared control signals of TV sets, infrared control signals of air conditioners, etc. Both can use the infrared repeater of the present invention for relay amplification to obtain better signal coverage.

The infrared remote controller 50 needs to be used for mobile use, and generally uses a dry battery for power supply, the transmission power is small, and the effective transmission distance of the wireless control signal is limited. Since the infrared repeater 40 does not need to move its position frequently, it can be powered by a lithium battery or commercial power. Therefore, the amplified infrared control signal has greater power and can be transmitted over a longer transmission distance. The infrared repeater 40 can be set independently, can also be integrated in one or more lamps in the lamp group 100, or integrated in other household appliances.

Refer to FIG. 18B for a schematic structural diagram of a lighting system according to another embodiment of the present invention. In this embodiment, there is an obstacle OBS1 between the infrared remote control 50 and the light group 100. If the infrared repeater 40 is not arranged, the infrared signal of the infrared remote control 50 is blocked by the obstacle OBS1 and cannot completely cover all the light groups 100. Lamps, some lamps in the lamp group 100 cannot be used normally because they cannot receive control signals. When the infrared repeater 40 is arranged in the system, the control signal of the infrared remote controller 50 can be relayed by the infrared repeater 40, which will increase the coverage angle of the control signal, thereby covering all the lamps in the lamp group 100, ensuring the lighting system 10 Normal operation.

Since the propagation of infrared signals is directional and the coverage angle of a single infrared emitting component is limited, in order to obtain a larger coverage angle, the infrared emitting module 43 may be configured with multiple infrared emitting components. A plurality of emitting components are arranged in an array to obtain a larger emitting angle. As shown in FIGS. 18A-18B, the infrared repeater 40 has a larger signal emission angle relative to the infrared remote controller 50, and can cover all the lamps in the light group 100.

Refer to FIG. 18C for a schematic diagram of a framework of a lighting system according to another embodiment of the present invention. The infrared repeater 40 can realize grouping control of the lamps in the lamp group 100. For example, set the lamps 100_1 and 100_2 as group 1, and other lamps as group 2. Group control can be performed by setting different channels. The lamps of group 1 can recognize the control signal of the first channel, the lamps of group 2 can recognize the control signal of the second channel, and the lamps of group 1 and group 2 can receive the control signal of the third channel. The infrared remote controller 50 uses the signal of the first signal to dim the lamps of the group 1, uses the signal of the second channel to dim the lamps of the group 2, and uses the signal of the third channel to dim the lamps of the group 1 and group 2 at the same time. . The three channels are independent of each other and do not interfere with each other. The lamps of group 1 are not controlled by the signal of the second channel, and the lamps of group 2 are not controlled by the signal of the first channel. In its embodiment, more groups can be set to control the lamps, and the number of channels can be increased accordingly as needed, and the present invention is not limited to this.

Refer to FIG. 19B for a schematic diagram of a circuit structure of an infrared repeater according to an embodiment of the present invention. With reference to FIG. 19A, the infrared repeater 40 includes an infrared signal receiving module 41, an infrared signal amplifying module 42 and an infrared signal transmitting module 43. The infrared signal receiving module 41 includes an infrared receiving probe 41a. The first pin of the infrared receiving probe is electrically connected to a common power terminal Vcc, the second pin is electrically connected to the first pin of the capacitor 42a, and the third pin is electrically connected to a common ground terminal GND. The infrared receiving probe 41a is used to receive the infrared control signal and convert the optical signal into an electrical signal.

The infrared signal amplifying module 42 receives the electrical signal generated by the infrared receiving probe 41a, and performs operational amplification processing. The infrared amplifying module 42 includes a capacitor 42a,

resistors

42b, 42c, 42d, 42f, 42i, and 42k,

transistors

42e, 42g, and 42h, and a field effect transistor 42j. The second pin of the capacitor 42a is electrically connected to a common ground GND. The resistor 42b and the capacitor 42a are connected in parallel, the first pin of the resistor 42c is electrically connected to the first pin of the capacitor 42a, and the second pin is electrically connected to the first pin of the transistor 42e. The second pin of the transistor 42e is electrically connected to the second pin of the resistor 42d, and the third pin of the transistor 42e is electrically connected to a common ground GND. The first pin of the resistor 42d is electrically connected to the common power terminal Vcc. The first pin of the transistor 42g and the first pin of the transistor 42h are electrically connected and electrically connected to the second pin of the transistor 42e and the first pin of the resistor 42f. The second pin of the resistor 42f is electrically connected to a common ground GND. The second pin of the transistor 42g is electrically connected to a power terminal Vcc, and the third pin of the transistor 42g is electrically connected to the second pin of the transistor 42h. The third pin of the transistor 42h is electrically connected to a common ground GND. The first pin of the resistor 42i is electrically connected to the third pin of the transistor 42g, and the second pin is electrically connected to the first pin of the field effect transistor 42j. The second pin of the field effect transistor 42j is electrically connected to the cathode of the infrared light emitting diode 43_1, and the third pin is electrically connected to a common ground terminal GMD. The first pin of the resistor 42k is electrically connected to a power terminal Vcc, and the second pin of the resistor 42k is electrically connected to the anode of the infrared light emitting diode 43_1.

The infrared emitting module 43 includes infrared light emitting diodes and 43-1, 43_2···43_n (n is an integer greater than or equal to 1). The infrared light-emitting diodes are connected in parallel and arranged in an array on the structure to increase the emission angle of the infrared signal.

Refer to FIG. 20 for a schematic diagram of working waveforms of an infrared repeater according to an embodiment of the present invention. The working principle of the infrared repeater will be described below in conjunction with FIG. 19B. S1 is the infrared signal received by the infrared repeater 40, S2 is a schematic diagram of the waveform output by the infrared receiving probe 41a, and S3 is a schematic diagram of the output waveform of the infrared repeater 40. When the signal S1 is low, the infrared receiver probe 41a outputs a high-level signal, the transistor 42e is turned on, and the transistor 42g and the transistor 42h form a totem pole to improve the signal driving ability. The output and the input signal are consistent, and the driving ability is increased. The signal received by the field effect transistor 42j is the low-level signal output by the totem pole. At this time, the field effect transistor 42j is disconnected, and the infrared light-emitting diodes 43_1, 43_2···43_n are not lit, that is, S3 is low power. flat. When S1 is high, the infrared receiving probe 41a outputs a low-level signal, and the transistor 42e is turned off. At the same time, the totem pole outputs a high-level signal to turn on the field effect transistor 42j, and the infrared light-emitting diodes 43_1, 43_2···43_n points On, that is, S3 is high.

Through this circuit configuration, the level directions of S1 and S2 can be kept consistent, because the infrared transmitting module 43 is composed of multiple infrared light-emitting diodes, and the infrared repeater 40 can output high-power infrared signals to realize the input signal enlarge. Arranging the infrared light-emitting diode arrays can significantly increase the signal coverage of the infrared repeater. Through the circuit architecture of this embodiment, the infrared signal relay and amplification function can be realized only by using discrete components, with low cost and high system reliability.

21 is a schematic diagram of signal coverage of an infrared repeater according to an embodiment of the present invention, and the emission angle of the infrared repeater is described. A three-dimensional coordinate system is established with the infrared repeater 40 as the center. The infrared repeater 40 includes a plurality of infrared emitting components. The arrays of the plurality of infrared emitting components are distributed on the infrared repeater 40. The coverage angles of different infrared emitting components partially overlap. , In order to achieve a larger angle of signal coverage. For example, setting a certain number of infrared emitting components in the positive direction of the z-axis can achieve signal coverage in the Z≥0 space. In other embodiments, signal coverage in the entire space can be achieved by arranging more infrared emitting components.

Similarly, in order to increase the use scenarios of the infrared repeater and obtain a more perfect user experience, the infrared receiving module 41 can be configured with multiple infrared receiving components, and multiple infrared receiving components can be arranged in an array to obtain a larger receiving angle. Receive infrared control signals from all directions.

The infrared repeater 40 receives the infrared control signal of the infrared remote controller 50, performs amplification processing, and generates an amplified infrared control signal. The amplification process of the infrared repeater 40 includes two levels. One is to amplify the signal strength to make the infrared control signal have greater power; the other is to amplify the angle of the signal to make the infrared control signal have greater coverage. angle.

Claims

An LED lamp lighting system is characterized by comprising:

A dimmer, the input terminal of which is electrically connected to the first external power input terminal, for receiving an external power signal and generating a dimming signal; and

The LED lamp is electrically connected to the first output terminal, the second output terminal and the second external power input terminal of the dimmer for receiving the dimming signal and adjusting the brightness or color temperature of the LED lamp.
The LED lamp lighting system of claim 1, wherein the LED lamp comprises:

A demodulation module, electrically connected to the dimmer, for receiving the dimming signal and converting the dimming signal into a dimming control signal;

The LED drive module is electrically connected to the external power source and the demodulation module, and is used to perform power conversion on the external power signal to generate a drive power source and adjust the drive power source according to the received dimming control signal; and

The LED module is electrically connected to the LED driving module for receiving the driving power to light up.
The LED lighting system of claim 2, wherein the dimmer comprises a first switch and a second switch, and the first pin of the first switch is electrically connected to the first external power source Input terminal, the second pin of the second switch is electrically connected to the LED drive module for use as a switch of the LED lighting system; the first pin of the second switch is electrically connected to the first switch The second pin is electrically connected to the demodulation module for generating a dimming signal.
5. The LED lighting system of claim 3, wherein the first switch is a normally open switch; the second switch is an inching switch and is set to be normally open.
The LED lighting system of claim 2, wherein the dimmer comprises a first switch, a third switch, and a fourth switch, and the first pin of the first switch is electrically connected to the The first external power input terminal, the first pin of the third switch and the first pin of the fourth switch are electrically connected and electrically connected to the second pin of the first switch, the third switch The second pin of the fourth switch is electrically connected to the LED driving module and the demodulation module, and the second pin of the fourth switch is electrically connected to the LED driving module and the demodulation module.
5. The LED lamp lighting system of claim 5, wherein the third switch and the fourth switch are inching switches and are set to be normally closed.
7. The LED lamp lighting system of claim 6, wherein the third switch and the fourth switch are set to be unable to be turned off at the same time.
An LED lamp lighting system is characterized by comprising:

A dimmer, the input terminal of which is electrically connected to the first external power input terminal, for converting the received external power signal into a dimming power signal according to a dimming command, and the dimming power signal contains dimming information; as well as

The LED lamp is electrically connected to the output terminal of the dimmer and the second external power input terminal for dimming according to the received dimming power signal.
The LED lighting system of claim 8, wherein the external power signal is a commercial AC signal, and the dimmer performs phase-cut processing on the external power signal according to the dimming command to generate The dimming power signal.
9. The LED lamp lighting system according to claim 9, wherein the tangent angle of the phase tangent processing is less than 90 degrees, and the size of the tangent angle corresponds to the brightness of the LED lamp.
9. The LED lamp lighting system of claim 10, wherein when the phase cut angle is a certain value, when the amplitude of the external power signal changes, the brightness of the LED lamp does not change.
8. The LED lighting system of claim 8, wherein the dimmer comprises:

The dimming signal generating module is used to generate a dimming signal according to the received dimming instruction;

A zero-crossing detection module, electrically connected to the first external power input terminal and the second external power input terminal, for detecting the zero-crossing point of the external power signal, and generating a zero-crossing signal;

A data modulation module, electrically connected to the first external power input terminal, for rectifying the external power signal and loading the dimming signal on the external power signal to generate the dimming power signal;

A filter circuit, electrically connected to the data modulation module, for filtering the received rectified signal to generate a filtered signal;

The power supply module is electrically connected to the filter circuit to perform power conversion on the filtered signal to generate a power supply signal for the dimmer; and

The control module is electrically connected to the zero-crossing detection module to receive the zero-crossing signal, start data modulation at a specific time after the zero-crossing, and load the dimming signal on the external power signal to generate The dimming power signal.
The LED lighting system of claim 12, wherein the dimming signal generating module comprises a wireless remote control and a signal receiving module, and the wireless remote control is used to convert the dimming command into a wireless dimming signal , The signal receiver module is used for converting the wireless dimming signal into the dimming signal.
The LED lighting system according to claim 12 or 13, wherein the dimming signal generating module comprises a light sensing module, and the light sensing module generates the dimming signal according to the intensity of ambient light.
The LED lamp lighting system of claim 12, wherein the data modulation module comprises a first diode, a second diode, a first Zener diode, a first transistor, a second transistor, and a third diode. Transistor; the anode of the first diode is electrically connected to the external power input terminal and the first pin of the first transistor, and its cathode is electrically connected to the cathode of the second diode and the first Zener diode The cathode

The second pin of the first transistor and the second pin of the second transistor are electrically connected and electrically connected to the first circuit node, and the third pin is electrically connected to the control module;

The first pin of the second transistor is electrically connected to the anode of the second diode and is electrically connected to the output terminal of the dimmer, and the third pin is electrically connected to the control module ; The first pin of the third transistor is electrically connected to the anode of the first Zener diode, the second pin is electrically connected to the third pin of the second transistor, and the third pin is It is electrically connected to the control module.
The LED lamp lighting system according to claim 15, wherein the external power signal is commercial AC power, characterized in that, within one AC half-wave (within half an AC cycle), the data modulation module includes three working stages : Power supply phase, power phase and data phase.
The LED lighting system of claim 16, wherein in the power supply phase, the external power signal provides power to the dimmer, and in the power phase, the external power signal is LED The lamp provides power, and in the data stage, the dimmer loads the dimming signal on the external power signal to generate the dimming power signal.
The LED lamp lighting system of claim 16, wherein, in the power supply phase, the first transistor and the second transistor are in an off state.
The LED lamp lighting system of claim 16, wherein, in the power stage, the first transistor and the second transistor are in a conducting state.
The LED lamp lighting system of claim 16, wherein in the data phase, the first transistor and the second transistor work in the amplifying region, and the third transistor is turned on intermittently.
The LED lamp lighting system of claim 8, wherein the LED lamp lighting system further comprises a fault detection module, and the fault detection module is electrically connected to the dimmer for bypassing the The dimmer performs fault detection.
22. The LED lighting system of claim 21, wherein the fault detection module comprises a first switch, and the first switch is electrically connected to the input terminal and the output terminal of the dimmer.
8. The LED lamp lighting system of claim 8, further comprising a sensor electrically connected to the dimmer and the LED lamp for changing the circuit state of the sensor based on environmental variables.
The LED lighting system of claim 23, wherein the environmental variable is the intensity of the ambient light, whether the human body is detected or the ambient sound, and so on.
The LED lamp lighting system of claim 23, wherein the sensor comprises:

The rectifier circuit is electrically connected to an external power source to rectify the received external power signal to generate a rectified signal;

A filter circuit, electrically connected to the rectifier circuit, for filtering the rectified signal to generate a filtered signal;

A power conversion circuit, electrically connected to the filter circuit, for power conversion of the filtered signal to generate a low-voltage DC signal;

A switch device electrically connected to the power supply circuit of the LED lamp, that is, connected in series with the LED lamp, for turning on and off the power supply circuit; and

A sensor control module, electrically connected to the power conversion circuit and the switching device, for working with the low-voltage direct current signal, and controlling the on-off of the switching device according to environmental variables;
The LED lamp lighting system of claim 25, wherein the rectifier circuit is a full-bridge rectifier circuit.
The LED lighting system of claim 25, wherein the filter circuit at least comprises a capacitor.
The LED lamp lighting system of claim 25, wherein the power conversion circuit is a DC step-down power conversion circuit.
The LED lamp lighting system of claim 25, wherein the switching device is a field effect transistor or a relay.
An infrared repeater, which is characterized by comprising:

Infrared signal receiving module for receiving infrared control signals;

An infrared signal amplifying module, electrically connected to the infrared signal receiving module, for amplifying the infrared control signal; and

The infrared signal transmitting module is electrically connected to the infrared signal amplifying module for transmitting the amplified infrared control signal.
The infrared repeater of claim 30, wherein the infrared signal emitting module comprises a plurality of infrared emitting components, and the infrared emitting components are arranged in an array.
The infrared repeater of claim 30, wherein the infrared signal receiving module comprises a plurality of infrared receiving components, and the infrared emitting components are arranged in an array.
The infrared repeater of claim 30, wherein the infrared repeater uses a battery or city power for power supply.
The infrared repeater of claim 30, wherein the infrared signal receiving module comprises an infrared receiving probe, the first pin of the infrared receiving probe is electrically connected to a power terminal, and the third pin Electrically connected to a common ground terminal; the infrared emitting module includes a first infrared light-emitting diode; the infrared amplifying module includes a first capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor , The first triode, the second triode, the third triode, and the first field effect transistor, the second pin of the first capacitor is electrically connected to the common ground terminal, the first resistor and the first The capacitors are connected in parallel, the first pin of the second resistor is electrically connected to the first pin of the first capacitor, and the second pin is electrically connected to the first pin of the first triode, the first triode The second pin of the third resistor is electrically connected to the second pin of the third resistor, the third pin is electrically connected to the common ground terminal, and the first pin of the third resistor is electrically connected to the power terminal , The first pin of the second triode and the first pin of the third triode are electrically connected and electrically connected to the second pin of the first triode and the first pin of the fourth resistor, The second pin of the fourth resistor is electrically connected to the common ground terminal, the second pin of the second transistor is electrically connected to the power terminal, and the third pin of the second transistor is electrically connected to the third transistor. The second pin, the third pin of the third transistor is electrically connected to the common ground terminal G, the first pin of the fifth resistor is electrically connected to the third pin of the second transistor, and The second pin is electrically connected to the first pin of the first field effect transistor, the second pin of the first field effect transistor is electrically connected to the cathode of the first infrared light emitting diode, and the third pin is electrically connected to The common ground terminal, the first pin of the sixth resistor is electrically connected to the power terminal, and the second pin of the sixth resistor is electrically connected to the anode of the first infrared light emitting diode.
An LED lamp, characterized by comprising a driving circuit, an LED module and a demodulation module, the demodulation module is electrically connected to an external power source for generating a dimming control signal according to the dimming information contained in the external power signal; The driving circuit is electrically connected to the external power supply and the demodulation module, and is used to perform power conversion on the received external power signal to generate a driving power supply, and adjust the driving power supply according to the dimming control signal; the LED The module is electrically connected to the driving circuit for receiving the driving power for lighting.
The LED lamp of claim 35, wherein the external power signal is a direct current signal.
The LED lamp of claim 35, wherein the LED lamp further comprises a rectifier circuit and a filter circuit, and the rectifier circuit is electrically connected to an external power source for rectifying an external power signal to generate a rectified signal; The filter circuit is electrically connected to the rectifier circuit to filter the rectified signal to generate a filtered signal; the filtered signal is used to provide the driving circuit.
37. The LED lamp of claim 37, wherein the filter circuit comprises at least one capacitor.
The LED lamp of claim 37, wherein the rectifier circuit is a full bridge rectifier circuit.
The LED lamp of claim 35, wherein the driving circuit is a step-down DC conversion circuit.