CN107071957B - LED dimming device and system based on coding signals - Google Patents

LED dimming device and system based on coding signals Download PDF

Info

Publication number
CN107071957B
CN107071957B CN201611237190.4A CN201611237190A CN107071957B CN 107071957 B CN107071957 B CN 107071957B CN 201611237190 A CN201611237190 A CN 201611237190A CN 107071957 B CN107071957 B CN 107071957B
Authority
CN
China
Prior art keywords
circuit
capacitor
output
resistor
input
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201611237190.4A
Other languages
Chinese (zh)
Other versions
CN107071957A (en
Inventor
钟少强
罗宇飞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tcl Huarui Lighting Technology Huizhou Co ltd
Very Optoelectronics Huizhou Co Ltd
Original Assignee
Tcl Huarui Lighting Technology Huizhou Co ltd
Very Optoelectronics Huizhou Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tcl Huarui Lighting Technology Huizhou Co ltd, Very Optoelectronics Huizhou Co Ltd filed Critical Tcl Huarui Lighting Technology Huizhou Co ltd
Priority to CN201611237190.4A priority Critical patent/CN107071957B/en
Publication of CN107071957A publication Critical patent/CN107071957A/en
Application granted granted Critical
Publication of CN107071957B publication Critical patent/CN107071957B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light

Landscapes

  • Led Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The invention relates to an LED dimming device and system based on a coding signal, wherein the LED dimming device based on the coding signal comprises: the device comprises an AC-DC voltage stabilizing circuit, a code input conversion circuit, a PWM signal processing circuit and a controlled dimming circuit; the input end of the AC-DC voltage stabilizing circuit is used for accessing to the commercial power, the first output end of the AC-DC voltage stabilizing circuit is connected with the first power end of the code input conversion circuit, the second output end of the AC-DC voltage stabilizing circuit is connected with the second power end of the PWM signal processing circuit, and the third output end of the AC-DC voltage stabilizing circuit is connected with the input end of the controlled dimming circuit; the input end of the code input conversion circuit is used for being connected with the code transmitting device, and the output end of the code input conversion circuit is connected with the input end of the PWM signal processing circuit; the output end of the PWM signal processing circuit is connected with the control end of the controlled dimming circuit, and the output end of the controlled dimming circuit is used for being connected with the LED lamp. The LED dimming device and the system can ensure the luminous flux of the LED lamp, and compared with a traditional dimming power supply, the LED dimming device and the system can reduce the volume and the cost.

Description

LED dimming device and system based on coding signals
Technical Field
The invention relates to the technical field of dimming, in particular to an LED dimming device based on a coding signal and an LED dimming system adopting the LED dimming device.
Background
With the development of LEDs in various fields such as illumination, communication and sensing technologies, the visible light communication (visible light communication, VLC) technology based on an LED illumination light source can be used for illumination and communication at the same time, and has the outstanding advantages of wide coverage range, energy conservation, consumption reduction, health and safety, directional radiation, simple arrangement, low cost, good electromagnetic compatibility and the like, and has good application prospect in the indoor positioning field. At present, an indoor positioning technology based on LED visible light needs a plurality of LED lamps as positioning nodes, each LED lamp needs different IDs, and the LED lamp ID with PWM signals is detected by utilizing an optical sensor technology.
The commonly used PWM dimming generally uses two modes:
one way is to directly apply a PWM signal to the control terminal of the control circuit, where the output current of the LED driver is also PWM, i.e. the LED beads will be on and off at high frequency, and the average brightness is adjusted according to different duty cycles. This approach can be used for indoor positioning in VLC technology, however, since the lighting fixtures typically require a certain luminous flux, requiring the LED beads to have a larger current in the lit state, a higher power driver and larger current rated LED beads are required, which increases the volume and cost of the product.
Another way is to convert the PWM signal into a dc voltage signal through a filter circuit and transmit the dc voltage signal to the control terminal of the control circuit. This approach is not suitable for indoor positioning in VLC technology because the PWM signal has been filtered to a dc voltage control signal and the output current of the LED driver is dc.
Disclosure of Invention
Based on this, it is necessary to provide an LED dimming device and system based on the encoded signal, which can ensure the luminous flux of the LED lamp, and can reduce the volume and cost compared with the conventional dimming power supply.
An LED dimming device based on a coding signal comprises an AC-DC voltage stabilizing circuit, a coding input conversion circuit, a PWM signal processing circuit and a controlled dimming circuit;
the input end of the AC-DC voltage stabilizing circuit is used for being connected with commercial power, the first output end of the AC-DC voltage stabilizing circuit is connected with the first power end of the code input conversion circuit, the second output end of the AC-DC voltage stabilizing circuit is connected with the second power end of the PWM signal processing circuit, and the third output end of the AC-DC voltage stabilizing circuit is connected with the input end of the controlled dimming circuit;
the input end of the code input conversion circuit is used for being connected with a code transmitting device, and the output end of the code input conversion circuit is connected with the input end of the PWM signal processing circuit;
The output end of the PWM signal processing circuit is connected with the control end of the controlled dimming circuit, and the output end of the controlled dimming circuit is used for being connected with an LED lamp.
In one embodiment, the code input conversion circuit includes a code input sub-circuit, a singlechip chip U5, a crystal oscillator Y1, a capacitor C24, a capacitor C25, a capacitor C26, and a capacitor C27;
the input end of the coding input sub-circuit is used for being connected with a coding transmitting device, and the output end of the coding input sub-circuit is connected with a signal input pin of the singlechip chip U5;
the on-chip oscillating circuit input pin of the single chip microcomputer chip U5 and the on-chip oscillating circuit output pin of the single chip microcomputer chip U5 are respectively connected with two ends of the crystal oscillator Y1, the on-chip oscillating circuit input pin of the single chip microcomputer chip U5 is grounded through the capacitor C26, the on-chip oscillating circuit output pin of the single chip microcomputer chip U5 is grounded through the capacitor C27, the power supply input pin of the single chip microcomputer chip U5 is connected with the first output end of the AC-DC voltage stabilizing circuit, the power supply input pin of the single chip microcomputer chip U5 is further connected with the ground through the capacitor C24, the reset pin of the single chip microcomputer chip U5 is connected with the first input end of the PWM signal processing circuit, and the second output pin of the single chip microcomputer chip U5 is connected with the second input end of the PWM signal processing circuit.
In one embodiment, the encoding input sub-circuit includes a communication connection socket J3, a power pin of the communication connection socket J3 is connected to a first output end of the AC-DC voltage stabilizing circuit, and two output pins of the communication connection socket J3 are respectively connected to two signal input pins of the single chip microcomputer chip U5.
In one embodiment, the code input sub-circuit includes a wireless communication module J4, a key SW1, a light emitting diode LED1 and a resistor R46;
the power pin of the wireless communication module J4 is connected with the first output end of the AC-DC voltage stabilizing circuit, the first input pin of the wireless communication module J4 is connected with the cathode of the light emitting diode LED1, the anode of the light emitting diode LED1 is connected with the first output end of the AC-DC voltage stabilizing circuit through the resistor R46, the second input pin of the wireless communication module J4 is connected with one end of the key SW1, the other end of the key SW1 is used for being grounded, and the two output pins of the wireless communication module J4 are respectively connected with the two signal input pins of the singlechip chip U5.
In one embodiment, the PWM signal processing circuit includes a resistor R32, a resistor R33, a resistor R34, a resistor R35, a resistor R36, a resistor R37, a resistor R38, a capacitor C12, and a MOS transistor Q4;
The grid electrode of the MOS tube Q4 is connected with the first output end of the code input conversion circuit, the grid electrode of the MOS tube Q4 is also connected with the second output end of the AC-DC voltage stabilizing circuit through the resistor R37, the grid electrode of the MOS tube Q4 is also grounded through the resistor R38, the drain electrode of the MOS tube Q4 is sequentially connected with the second output end of the AC-DC voltage stabilizing circuit through the resistor R36, the resistor R34 and the resistor R32 which are connected in series, and the source electrode of the MOS tube Q4 is grounded;
one end of the resistor R35 is connected with a connecting node between the resistor R36 and the resistor R34, and the other end of the resistor R35 is grounded;
one end of the capacitor C12 is connected with the second output end of the code input conversion circuit through the resistor R33, one end of the capacitor C12 is also connected with a connecting node between the resistor R34 and the resistor R32, and the other end of the capacitor C12 is used for grounding;
and a connection node between the resistor R34 and the resistor R36 is used as an output end of the PWM signal processing circuit and is connected with a control end of the controlled dimming circuit.
In one embodiment, the controlled dimming circuit includes a constant current chip U2, a MOS transistor Q5, a sampling resistor RS, a resistor R22, a resistor R30, a resistor R33, a resistor R331, a capacitor C10, a capacitor C11, a capacitor C13, a common mode inductance L4, an inductance L5, and a diode D7;
The input pin of the constant current chip U2 is connected with the third output end of the AC-DC voltage stabilizing circuit, the input pin of the constant current chip U2 is also connected with the cathode of the diode D7, the power pin of the constant current chip U2 is grounded through the capacitor C11, the control pin of the constant current chip U2 is connected with the output end of the PWM signal processing circuit, the current sampling pin of the constant current chip U2 is connected with the third output end of the AC-DC voltage stabilizing circuit through the sampling resistor RS, the current sampling pin of the constant current chip U2 is also respectively connected with the first end of the capacitor C13 and the first input end of the common mode inductor L4, and the output pin of the constant current chip U2 is respectively connected with the first end of the resistor R31 and the grid electrode of the MOS tube Q5 through the resistor R30;
the second end of the resistor R31 and the source electrode of the MOS tube Q5 are respectively grounded, and the drain electrode of the MOS tube Q5 is respectively connected with the anode of the diode D7, the second end of the capacitor C13 and the second input end of the common-mode inductor L4 through the inductor L5;
two ends of the resistor R22 are respectively connected with a first output end of the common-mode inductor L4 and a second output end of the common-mode inductor L4, and the capacitor C10 is connected with the resistor R22 in parallel;
The first output end of the common-mode inductor L4 and the second output end of the common-mode inductor L4 are respectively used as two output ends of the controlled dimming circuit and are used for being connected with an LED lamp.
In one embodiment, the AC-DC voltage stabilizing circuit includes an input filtering rectifier sub-circuit, a transformer sub-circuit, a power switch sub-circuit, a chip power supply sub-circuit, a first output sub-circuit, and a second output sub-circuit, the transformer sub-circuit including a primary winding, a first secondary winding, a second secondary winding, and a third secondary winding;
the input end of the input filter rectifier circuit is used for being connected with mains supply, and the output end of the input filter rectifier circuit is respectively connected with the first end of the primary winding and the third power end of the power switch sub-circuit;
the output end of the power switch sub-circuit is connected with the second end of the primary winding;
the first end of the first secondary winding is connected with the input end of the first output sub-circuit, the second end of the first primary winding is used for grounding, the first output end of the first output sub-circuit is connected with the first power end of the code input conversion circuit, and the second output end of the first output sub-circuit is connected with the second power end of the PWM signal processing circuit;
The first end of the second secondary winding is connected with the third power supply end through the chip electronic circuit, and the second end of the second primary winding is used for grounding;
the first end of the third secondary winding is connected with the input end of the second output sub-circuit, the second end of the third secondary winding is used for being grounded, and the output end of the second output sub-circuit is connected with the input end of the controlled dimming circuit.
In one embodiment, the first output sub-circuit includes a voltage stabilizing chip U6, a diode D6, a voltage stabilizing diode ZD2, a triode Q3, a resistor R19, a capacitor EC2, a parallel capacitor C9 and a capacitor C20, and a parallel capacitor C21 and a capacitor C22;
the anode of the diode D6 is connected with the first end of the first secondary winding, the cathode of the diode D6 is respectively connected with the first end of the capacitor EC2 and the collector of the triode Q3 through the resistor R20, the emitter of the triode Q3 is connected with the second output pin of the voltage stabilizing chip U6, the base of the triode Q3 is connected with the first end of the capacitor EC2 through the resistor R19, the base of the triode Q3 is also connected with the first end of the capacitor EC2, and the anode of the voltage stabilizing diode ZD2 and the second end of the capacitor EC2 are respectively used for grounding;
One end of the capacitor C9 and one end of the capacitor C20 which are connected in parallel are connected with a second output pin of the voltage stabilizing chip U6, and the other end of the capacitor C9 and the other end of the capacitor C20 which are connected in parallel are grounded;
one end of the capacitor C21 and one end of the capacitor C22 which are connected in parallel are connected with a first output pin of the voltage stabilizing chip U6, and the other end of the capacitor C21 and the other end of the capacitor C22 which are connected in parallel are grounded;
the first output pin of the voltage stabilizing chip U6 is a first output end of the first output sub-circuit; the second output pin of the voltage stabilizing chip U6 is a second output end of the first output sub-circuit.
In one embodiment, the second output sub-circuit includes a diode D5, a resistor R21 and a capacitor C4 connected in series, and a capacitor EC3 and a capacitor EC4 connected in parallel;
the resistor R21 and the capacitor C4 which are connected in series are connected with the diode D5 in parallel, the anode of the diode D5 is connected with the first end of the third secondary winding, the cathode of the diode D5 is connected with one end of the capacitor EC3 and one end of the capacitor EC4 which are connected in parallel, the other end of the capacitor EC3 and the other end of the capacitor EC4 which are connected in parallel are used for grounding, the cathode of the diode D5 is used as the output end of the second output sub-circuit, and the cathode of the diode D5 is also connected with the input end of the controlled dimming circuit.
An LED dimming system based on a coded signal, comprising an LED lamp and an LED dimming device according to any one of the above, wherein the LED lamp is connected with an output end of a controlled dimming circuit of the LED dimming device.
According to the LED dimming device and the system, the external coding signal is converted into the PWM signal through the coding input conversion circuit, and the LED light source is dimmed according to the PWM signal output current, so that the LED light source can be used as a positioning node and applied to VLC technology. The external coding signal is converted into the PWM signal with the adjustable duty ratio, so that the output current can be improved by adjusting the duty ratio, and the luminous flux of the LED lamp is ensured; since there is no need to additionally provide a high-power driver, the volume and cost can be reduced compared with the conventional dimming power source. Therefore, the LED dimming device can effectively reduce the volume and the cost of the power supply under the condition of maintaining the same luminous flux.
Drawings
Fig. 1 is a schematic structural diagram of an LED dimming device based on a coded signal according to an embodiment of the present invention;
fig. 2a is a circuit diagram of an LED dimming device based on a coded signal according to an embodiment of the present invention;
fig. 2b is a circuit diagram of an LED dimming device based on a coded signal according to another embodiment of the present invention;
Fig. 3 is a schematic structural diagram of an LED dimming device based on a coded signal according to another embodiment of the present invention;
FIG. 4 is a waveform diagram of an internal code signal PWM_code according to an embodiment of the present invention;
fig. 5 is a waveform diagram of PWM dimming signal pwm_dim and dimming reference voltage dim_ref according to an embodiment of the present invention;
fig. 6 is a waveform diagram of a control signal DIM according to an embodiment of the present invention;
FIG. 7 is a waveform diagram of an output current of the constant current chip U2 according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an LED dimming system based on a coded signal according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
For example, an LED dimming device based on a coded signal includes an AC (Alternating current ) -DC (Direct current) voltage stabilizing circuit, a coded input conversion circuit, a PWM (Pulse Width Modulation) signal processing circuit, and a controlled dimming circuit; the input end of the AC-DC voltage stabilizing circuit is used for being connected with commercial power, the first output end of the AC-DC voltage stabilizing circuit is connected with the first power end of the code input conversion circuit, the second output end of the AC-DC voltage stabilizing circuit is connected with the second power end of the PWM signal processing circuit, and the third output end of the AC-DC voltage stabilizing circuit is connected with the input end of the controlled dimming circuit; the input end of the code input conversion circuit is used for being connected with the code transmitting device, and the output end of the code input conversion circuit is connected with the input end of the PWM signal processing circuit; the output end of the PWM signal processing circuit is connected with the control end of the controlled dimming circuit, the output end of the controlled dimming circuit is used for being connected with the LED lamp, for example, the two output ends of the controlled dimming circuit are respectively used for being connected with the anode and the cathode of the LED lamp.
Fig. 1 is a schematic diagram of an LED dimming device 100 according to an embodiment of the invention. As shown in fig. 1, the LED dimming device includes an AC-DC voltage stabilizing circuit 110, a code input converting circuit 120, a PWM signal processing circuit 130, and a controlled dimming circuit 140, where an input end of the AC-DC voltage stabilizing circuit is used for accessing to a mains supply, a first output end of the AC-DC voltage stabilizing circuit is connected to a first power end of the code input converting circuit, a second output end of the AC-DC voltage stabilizing circuit is connected to a second power end of the PWM signal processing circuit, and a third output end of the AC-DC voltage stabilizing circuit is connected to an input end of the controlled dimming circuit; the input end of the code input conversion circuit is used for being connected with the code transmitting device, and the output end of the code input conversion circuit is connected with the input end of the PWM signal processing circuit; the output end of the PWM signal processing circuit is connected with the control end of the controlled dimming circuit, the output end of the controlled dimming circuit is used for being connected with the LED lamp, for example, the two output ends of the controlled dimming circuit are respectively used for being connected with the anode and the cathode of the LED lamp.
In this embodiment, the AC-DC voltage stabilizing circuit performs rectification, voltage conversion and voltage stabilization processing on the accessed AC mains supply to obtain at least three stable direct current voltage outputs, where the at least three stable direct current voltages respectively supply power to the code input conversion circuit, the PWM signal processing circuit and the controlled dimming circuit.
The code input conversion circuit is used for acquiring an external code signal, decoding and converting the external code signal into an internal code signal and a PWM dimming signal, and outputting the internal code signal and the PWM dimming signal to the PWM signal processing circuit. The code input conversion circuit receives an external code signal sent by an external code sending device through the communication connecting seat or the wireless communication module. For example, the external code transmitting device is an upper computer.
As an implementation mode, the code input conversion circuit comprises a singlechip chip, and the singlechip chip decodes and converts an external code signal into an internal code signal and a PWM dimming signal. For example, the PWM dimming signal is a duty-cycle adjustable PWM signal.
The PWM signal processing circuit adjusts the voltage value of the control signal output by the PWM signal processing circuit according to the internal coding signal and the PWM dimming signal, and sends the control signal to the controlled dimming circuit, and the controlled dimming circuit dims the LED lamp according to the voltage value of the control signal. For example, the dimming control circuit adjusts the output current value according to the voltage value of the control signal so as to dim the LED lamp.
According to the LED dimming device, the external coding signal is converted into the PWM signal through the coding input conversion circuit, and the LED light source is dimmed according to the PWM signal output current, so that the LED light source can be used as a positioning node and applied to VLC technology. The external coding signal is converted into the PWM signal with the adjustable duty ratio, so that the output current can be improved by adjusting the duty ratio, and the luminous flux of the LED lamp is ensured; since there is no need to additionally provide a high-power driver, the volume and cost can be reduced compared with the conventional dimming power source. Therefore, the LED dimming device can effectively reduce the volume and the cost of the power supply under the condition of maintaining the same luminous flux.
Referring to fig. 2a and fig. 2b together, fig. 2a is a circuit diagram of an AC-DC voltage stabilizing circuit according to an embodiment, and fig. 2b is a circuit diagram of a code input converting circuit, a PWM signal processing circuit and a controlled dimming circuit according to an embodiment.
In one embodiment, as shown in fig. 2b, the code input conversion circuit 120 includes a code input sub-circuit 121, a single chip microcomputer U5, a crystal oscillator Y1, a capacitor C24, a capacitor C25, a capacitor C26 and a capacitor C27; the input end of the coding input sub-circuit is used for being connected with the coding transmitting device, and the output end of the coding input sub-circuit is connected with a signal input pin of the singlechip chip U5; the input pin of the on-chip oscillating circuit of the single chip microcomputer chip U5 and the output pin of the on-chip oscillating circuit of the single chip microcomputer chip U5 are respectively connected with two ends of the crystal oscillator Y1, the input pin of the on-chip oscillating circuit of the single chip microcomputer chip U5 is grounded through a capacitor C26, the output pin of the on-chip oscillating circuit of the single chip microcomputer chip U5 is grounded through a capacitor C27, the power input pin of the single chip microcomputer chip U5 is connected with the first output end of the AC-DC voltage stabilizing circuit, the power input pin of the single chip microcomputer chip U5 is grounded through a capacitor C24, the reset pin of the single chip microcomputer chip U5 is grounded through a capacitor C25, the first output pin of the single chip microcomputer chip U5 is connected with the first input end of the PWM signal processing circuit, and the second output pin of the single chip microcomputer chip U5 is connected with the second input end of the PWM signal processing circuit.
The capacitor C26, the capacitor C27 and the crystal oscillator Y1 form an oscillating circuit of the single-chip microcomputer chip U5, and the oscillating circuit is combined with a circuit inside the single-chip microcomputer chip U5 to generate clock frequency required by the single-chip microcomputer chip U5. The capacitor C25 and the capacitor C24 are used for filtering, respectively.
Specifically, the single-chip microcomputer chip U5 converts the external coding signal code into the internal coding signal pwm_code and the PWM dimming signal pwm_dim, the first output pin of the single-chip microcomputer chip U5 sends the internal coding signal pwm_code to the first input end of the PWM signal processing circuit, and the second output pin of the single-chip microcomputer chip U5 sends the PWM dimming signal pwm_dim to the second input end of the PWM signal processing circuit. The internal coding signal PWM_code is obtained by sequencing a plurality of square wave signals with different periods according to set requirements. For example, as shown in fig. 4, the internal code signal pwm_code is obtained by sequentially arranging a plurality of square wave signals with periods of t0, t1, t2, t3, etc., where t0 represents code 0, t1 represents code 1, t2 represents code 2, and t3 represents code 3, and since each code has a different period, each code may form an ID (identification) according to an arrangement combination of preset bits, for example, one 7-bit ID of the 4 codes is [0,1,3,1,0,3,2]. When the preset number of bits is N and the number of codes is M, M N-bit IDs to the power of N may be formed, for example, the 4 codes may form 2401 IDs to the power of 7.
Wherein the outer code signal is obtained from an outer code transmitting device. For example, the code input sub-circuit 121 includes at least one of a communication connection module 121a and a wireless communication module 121b, and the communication connection module 121a receives an external code signal transmitted by an external code transmitting device such as an upper computer, or the wireless communication module 121b receives an external code signal transmitted by an external code transmitting device such as an upper computer in a wireless manner.
For example, as shown in fig. 2b, the encoding input sub-circuit includes a communication connection socket J3, a power pin of the communication connection socket J3 is connected to a first output end of the AC-DC voltage stabilizing circuit, and two output pins of the communication connection socket J3 are respectively connected to two signal input pins of the single chip microcomputer chip U5. For another example, the communication connection seat J3 sends the external coding signal to the single chip microcomputer chip U5 through UART (Universal Asynchronous Receiver/transceiver) protocol. For another example, the external coding signal includes a uart_rx signal and a uart_tx signal, the single chip microcomputer chip U5 includes at least two signal input pins, and the uart_rx signal and the uart_tx signal are respectively input to different two signal input pins in the single chip microcomputer chip U5.
As another example, as shown in fig. 2b, the code input sub-circuit includes a wireless communication module J4, a key SW1, a light emitting diode LED1 and a resistor R46; the power pin 8 of the wireless communication module J4 is connected with the first output end of the AC-DC voltage stabilizing circuit, the first input pin 4 of the wireless communication module J4 is connected with the cathode of the light emitting diode LED1, the anode of the light emitting diode LED1 is connected with the first output end of the AC-DC voltage stabilizing circuit through the resistor R46, the second input pin 3 of the wireless communication module J4 is connected with one end of the key SW1, the other end of the key SW1 is used for grounding, and the two output pins 6 and 7 of the wireless communication module J4 are respectively connected with the two signal input pins of the single chip microcomputer chip U5. When the key SW1 is pressed, the wireless communication module J4 is started to receive an external coding signal sent by a coding sending device such as an upper computer, wherein the external coding signal comprises a uart_rx signal and a uart_tx signal, and the wireless communication module J4 sends the uart_rx signal and the uart_tx signal to two signal input pins of the single chip microcomputer chip U5 through the output pin 6 and the output pin 7 respectively.
The light emitting diode LED1 is used for indicating the state of the wireless communication module J4, for example, when the wireless communication module J4 is in the working state, the light emitting diode LED1 is turned on to emit light.
In one embodiment, as shown in fig. 2b, the PWM signal processing circuit includes a resistor R32, a resistor R33, a resistor R34, a resistor R35, a resistor R36, a resistor R37, a resistor R38, a capacitor C12, and a MOS transistor Q4; the grid electrode of the MOS tube Q4 is used as a first input end of the PWM signal processing circuit and is connected with a first output end of the coding input conversion circuit, the grid electrode of the MOS tube Q4 is also connected with a second output end of the AC-DC voltage stabilizing circuit through a resistor R37, the grid electrode of the MOS tube Q4 is also grounded through a resistor R38, the drain electrode of the MOS tube Q4 is connected with the second output end of the AC-DC voltage stabilizing circuit through a resistor R36, a resistor R34 and a resistor R32 which are connected in series in sequence, and the source electrode of the MOS tube Q4 is grounded; one end of the resistor R35 is connected with a connecting node between the resistor R36 and the resistor R34, and the other end of the resistor R35 is grounded; one end of the capacitor C12 is connected with the second output end of the code input conversion circuit through a resistor R33, one end of the capacitor C12 is also connected with a connecting node between a resistor R34 and a resistor R32, and the other end of the capacitor C12 is used for grounding; the connection node between the resistor R34 and the resistor R36 is used as the output end of the PWM signal processing circuit and is connected with the control end of the controlled dimming circuit.
In this embodiment, the first output terminal of the code input conversion circuit outputs the internal code signal pwm_code, and the second output terminal of the code input conversion circuit outputs the PWM dimming signal pwm_dim. As shown in fig. 5, after the PWM dimming signal pwm_dim is filtered by the RC filter circuit formed by the resistor R33 and the capacitor C12, a dimming reference voltage dim_ref is formed at two ends of the capacitor C12,
the dimming reference voltage dim_ref is divided by R34 and R35 to determine the maximum value of the output current. The internal coding signal PWM_code is transmitted to the grid electrode of the MOS tube Q4, the drain-source voltage of the MOS tube Q4 is controlled, and when the MOS tube Q4 is cut off, the output end voltage of the PWM signal processing circuit is higher, and a high level is output; when the MOS transistor Q4 is turned on, the resistor R36 is connected in parallel with the resistor R35, the voltage at the output end of the PWM signal processing circuit (namely, the connection node among the resistor R34, the resistor R35 and the resistor R36) is reduced, and a low level is output. As shown in fig. 6, the control signal DIM output from the output terminal of the PWM signal processing circuit switches between high and low levels, the control signal DIM corresponding to the period and the duty ratio of the internal code signal pwm_code.
The voltage value of the control signal DIM at the low level is related to the resistance value of the resistor R36, and by adjusting the resistance value of the resistor R36, the voltage value of the control signal DIM at the low level can be set, so as to adjust the output current of the controlled dimming circuit. For example, by adjusting the resistance value of the resistor R36, when the control signal DIM is at a low level, the output current of the controlled dimming circuit can be greater than 50% of the maximum output current, so as to increase the luminous flux of the LED light source.
In one embodiment, as shown in fig. 2b, the controlled dimming circuit includes a constant current chip U2, a MOS transistor Q5, a sampling resistor RS, a resistor R22, a resistor R30, a resistor R33, a resistor R331, a capacitor C10, a capacitor C11, a capacitor C13, a common mode inductance L4, an inductance L5, and a diode D7; the input pin of the constant current chip U2 is connected with the third output end of the AC-DC voltage stabilizing circuit, the input pin of the constant current chip U2 is also connected with the cathode of the diode D7, the power pin of the constant current chip U2 is grounded through the capacitor C11, the control pin of the constant current chip U2 is used as the control end of the controlled dimming circuit and is connected with the output end of the PWM signal processing circuit, the current sampling pin of the constant current chip U2 is connected with the third output end of the AC-DC voltage stabilizing circuit through the sampling resistor RS, the current sampling pin of the constant current chip U2 is also respectively connected with the first end of the capacitor C13 and the first input end of the common mode inductor L4, and the output pin of the constant current chip U2 is respectively connected with the first end of the resistor R31 and the grid electrode of the MOS tube Q5 through the resistor R30; the second end of the resistor R31 and the source electrode of the MOS tube Q5 are respectively grounded, and the drain electrode of the MOS tube Q5 is respectively connected with the anode of the diode D7, the second end of the capacitor C13 and the second input end of the common-mode inductor L4 through the inductor L5; two ends of the resistor R22 are respectively connected with a first output end of the common-mode inductor L4 and a second output end of the common-mode inductor L4, and the capacitor C10 is connected with the resistor R22 in parallel; the first output end of the common-mode inductor L4 and the second output end of the common-mode inductor L4 are respectively used as two output ends of the controlled dimming circuit and are used for being connected with the LED lamp.
The constant current chip U2 outputs current with corresponding magnitude according to the voltage of a control pin (DIM pin) thereof. That is, when the DIM pin of the constant current chip U2 receives the high and low levels of the control signal DIM output from the PWM signal processing circuit after the code conversion, a corresponding current is output according to the voltage values of the high and low levels. For example, when the code sequence of the encoded signal is [0,1,3,1,0,3,2], the constant current chip U2 outputs a current waveform as shown in fig. 7. As shown in fig. 6, the current at the low level can be set to 0-70% of the maximum current, so that a higher output current can be maintained even at the low level, thereby enabling effective reduction in the volume and cost of the power supply while maintaining the same luminous flux.
In one embodiment, as shown in fig. 3, the AC-DC voltage stabilizing circuit 110 includes an input filter rectifier sub-circuit 111, a transformer sub-circuit 112, a power switch sub-circuit 113, a chip power supply sub-circuit 114, a first output sub-circuit 115, and a second output sub-circuit 116, wherein the transformer sub-circuit includes a primary winding T1a, a first secondary winding T1b, a second secondary winding T1c, and a third secondary winding T1d; the input end of the input filter rectifier circuit is used for being connected with the mains supply, and the output end of the input filter rectifier circuit is respectively connected with the first end of the primary winding and the third power end of the power switch sub circuit; the output end of the power switch sub-circuit is connected with the second end of the primary winding; the first end of the first secondary winding is connected with the input end of the first output sub-circuit, the second end of the first primary winding is used for grounding, the first output end of the first output sub-circuit is connected with the first power end of the code input conversion circuit, and the second output end of the first output sub-circuit is connected with the second power end of the PWM signal processing circuit; the first end of the second secondary winding is connected with a third power supply end through a chip electronic circuit, and the second end of the second primary winding is used for grounding; the first end of the third secondary winding is connected with the input end of the second output subcircuit, the second end of the third secondary winding is used for grounding, and the output end of the second output subcircuit is connected with the input end of the controlled dimming circuit. The output end of the second output sub-circuit is the third output end of the AC-DC voltage stabilizing circuit. It will be appreciated that the first power supply terminal, the second power supply terminal, and the third power supply terminal are names for easy distinction, the first power supply terminal of the code input conversion circuit is the power supply terminal of the code input conversion circuit, the second power supply terminal of the PWM signal processing circuit is the power supply terminal of the PWM signal processing circuit, and the third power supply terminal of the power switch sub-circuit is the power supply terminal of the power switch sub-circuit.
In this embodiment, the power switch sub-circuit includes a power chip U1 and a switch tube Q1, and before the power chip U1 is started, the voltage at the output end of the input filter rectifier circuit 111 is divided and then output to the power pin of the power chip U1, so as to supply power to the power chip U1 to start the power chip U1. After the power chip U1 is started, the first secondary winding T1b, the second secondary winding T1c and the third secondary winding T1d sense voltages respectively, and the chip power supply circuit 114 processes the sensed voltage of the second secondary winding T1c to supply power to the power chip U1. The induced voltage of the first secondary winding T1b is processed by the first output sub-circuit, and then is supplied to the code input conversion circuit and the PWM signal processing circuit, and the induced voltage of the second secondary winding T1c is processed by the chip electronic circuit and then is supplied to the power supply chip U1.
In one embodiment, as shown in fig. 2a, the first output sub-circuit includes a voltage stabilizing chip U6, a diode D6, a voltage stabilizing diode ZD2, a triode Q3, a resistor R19, a capacitor EC2, a parallel capacitor C9 and C20, and a parallel capacitor C21 and C22; the anode of the diode D6 is used as the input end of the first output subcircuit and is connected with the first end of the first secondary winding, the cathode of the diode D6 is respectively connected with the first end of the capacitor EC2 and the collector of the triode Q3 through a resistor R20, the emitter of the triode Q3 is connected with the second output pin of the voltage stabilizing chip U6, the base of the triode Q3 is connected with the first end of the capacitor EC2 through a resistor R19, the base of the triode Q3 is also connected, and the anode of the voltage stabilizing diode ZD2 and the second end of the capacitor EC2 are respectively used for grounding; one end of the capacitor C9 and one end of the capacitor C20 which are connected in parallel are connected with a second output pin of the voltage stabilizing chip U6, and the other end of the capacitor C9 and the other end of the capacitor C20 which are connected in parallel are grounded; one end of the capacitor C21 and one end of the capacitor C22 which are connected in parallel are connected with a first output pin of the voltage stabilizing chip U6, and the other end of the capacitor C21 and the other end of the capacitor C22 which are connected in parallel are grounded; the first output pin of the voltage stabilizing chip U6 is a first output end of the first output sub-circuit; the second output pin of the voltage stabilizing chip U6 is the second output end of the first output sub-circuit. For example, the first output pin of the voltage stabilizing chip U6 outputs a constant voltage of +3.3v, and the second output pin of the voltage stabilizing chip U6 outputs a constant voltage of +12v.
In one embodiment, the second output sub-circuit includes a diode D5, a resistor R21 and a capacitor C4 in series, and a capacitor EC3 and a capacitor EC4 in parallel; the resistor R21 and the capacitor C4 which are connected in series are connected with the diode D5 in parallel, the anode of the diode D5 is connected with the first end of the third secondary winding, the cathode of the diode D5 is connected with one end of the capacitor EC3 and one end of the capacitor EC4 which are connected in parallel, the other end of the capacitor EC3 and the other end of the capacitor EC4 which are connected in parallel are used for grounding, the cathode of the diode D5 is used as the output end of the second output sub-circuit, and the cathode of the diode D5 is also connected with the input end of the controlled dimming circuit.
Wherein diode D5 is used for rectification. For example, to enhance the rectifying effect, the diode D5 is composed of at least two diodes connected in parallel in the forward direction. The resistor R21 and the capacitor C4 connected in series, and the capacitor EC3 and the capacitor EC4 connected in parallel are used for filtering, for example, in order to enhance the filtering effect, electrolytic capacitors are adopted for the capacitor EC3 and the capacitor EC4, wherein anodes of the electrolytic capacitors EC3 and EC4 are respectively connected with a cathode of the diode D5, and cathodes of the electrolytic capacitors EC3 and EC4 are respectively used for grounding.
The invention also discloses an LED dimming system based on the coding signal, as shown in fig. 8, the LED dimming system comprises an LED lamp and the LED dimming device according to any embodiment, wherein the LED lamp is connected with the LED dimming device. For example, the LED luminaire is connected to an output of a controlled dimming circuit of the LED dimming device.
According to the LED dimming system based on the coding signal, the external coding signal is converted into the PWM signal with the adjustable duty ratio, so that the output current can be improved by adjusting the duty ratio, and the luminous flux of the LED lamp is ensured; since there is no need to additionally provide a high-power driver, the volume and cost can be reduced compared with the conventional dimming power source. Therefore, the LED dimming device can effectively reduce the volume and the cost of the power supply under the condition of maintaining the same luminous flux.
It should be noted that in the above embodiments, when one element is considered as being "connected" to another element, it may be directly connected to the other element or intermediate elements may be present at the same time. In contrast, when an element is referred to as being "directly connected" to another element, there are no intervening elements present.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (10)

1. The LED dimming device based on the coding signal is characterized by comprising an AC-DC voltage stabilizing circuit, a coding input conversion circuit, a PWM signal processing circuit and a controlled dimming circuit;
the input end of the AC-DC voltage stabilizing circuit is used for being connected with commercial power, the first output end of the AC-DC voltage stabilizing circuit is connected with the first power end of the code input conversion circuit, the second output end of the AC-DC voltage stabilizing circuit is connected with the second power end of the PWM signal processing circuit, and the third output end of the AC-DC voltage stabilizing circuit is connected with the input end of the controlled dimming circuit;
the input end of the code input conversion circuit is used for being connected with a code transmitting device, and the output end of the code input conversion circuit is connected with the input end of the PWM signal processing circuit; the code input conversion circuit is used for acquiring an external code signal, decoding and converting the external code signal into an internal code signal and a PWM dimming signal, and outputting the internal code signal and the PWM dimming signal to the PWM signal processing circuit; the internal coding signals are obtained by sequencing a plurality of square wave signals with different periods according to set requirements;
the code input conversion circuit comprises a code input sub-circuit, a singlechip chip U5, a crystal oscillator Y1, a capacitor C24, a capacitor C25, a capacitor C26 and a capacitor C27;
The input end of the coding input sub-circuit is used for being connected with a coding transmitting device, and the output end of the coding input sub-circuit is connected with a signal input pin of the singlechip chip U5;
the input pin of the on-chip oscillating circuit of the single chip microcomputer chip U5 and the output pin of the on-chip oscillating circuit of the single chip microcomputer chip U5 are respectively connected with two ends of the crystal oscillator Y1, the input pin of the on-chip oscillating circuit of the single chip microcomputer chip U5 is grounded through the capacitor C26, and the output pin of the on-chip oscillating circuit of the single chip microcomputer chip U5 is grounded through the capacitor C27;
the output end of the PWM signal processing circuit is connected with the control end of the controlled dimming circuit, and the output end of the controlled dimming circuit is used for being connected with an LED lamp.
2. The LED dimmer device according to claim 1, wherein the power input pin of the single chip U5 is connected to the first output terminal of the AC-DC voltage stabilizing circuit, the power input pin of the single chip U5 is further connected to the ground through the capacitor C24, the reset pin of the single chip U5 is connected to the ground through the capacitor C25, the first output pin of the single chip U5 is connected to the first input terminal of the PWM signal processing circuit, and the second output pin of the single chip U5 is connected to the second input terminal of the PWM signal processing circuit.
3. The LED dimmer device according to claim 1, wherein the code input sub-circuit comprises a communication connection socket J3, a power pin of the communication connection socket J3 is connected to the first output terminal of the AC-DC voltage stabilizing circuit, and two output pins of the communication connection socket J3 are respectively connected to two signal input pins of the single chip microcomputer U5.
4. The LED dimmer apparatus of claim 1, wherein the coded input sub-circuit comprises a wireless communication module J4, a key SW1, a light emitting diode LED1 and a resistor R46;
the power pin of the wireless communication module J4 is connected with the first output end of the AC-DC voltage stabilizing circuit, the first input pin of the wireless communication module J4 is connected with the cathode of the light emitting diode LED1, the anode of the light emitting diode LED1 is connected with the first output end of the AC-DC voltage stabilizing circuit through the resistor R46, the second input pin of the wireless communication module J4 is connected with one end of the key SW1, the other end of the key SW1 is used for being grounded, and the two output pins of the wireless communication module J4 are respectively connected with the two signal input pins of the singlechip chip U5.
5. The LED dimmer apparatus of claim 1, wherein the PWM signal processing circuit comprises resistor R32, resistor R33, resistor R34, resistor R35, resistor R36, resistor R37, resistor R38, capacitor C12, and MOS transistor Q4;
The grid electrode of the MOS tube Q4 is connected with the first output end of the code input conversion circuit, the grid electrode of the MOS tube Q4 is also connected with the second output end of the AC-DC voltage stabilizing circuit through the resistor R37, the grid electrode of the MOS tube Q4 is also grounded through the resistor R38, the drain electrode of the MOS tube Q4 is sequentially connected with the second output end of the AC-DC voltage stabilizing circuit through the resistor R36, the resistor R34 and the resistor R32 which are connected in series, and the source electrode of the MOS tube Q4 is grounded;
one end of the resistor R35 is connected with a connecting node between the resistor R36 and the resistor R34, and the other end of the resistor R35 is grounded;
one end of the capacitor C12 is connected with the second output end of the code input conversion circuit through the resistor R33, one end of the capacitor C12 is also connected with a connecting node between the resistor R34 and the resistor R32, and the other end of the capacitor C12 is used for grounding;
and a connection node between the resistor R34 and the resistor R36 is used as an output end of the PWM signal processing circuit and is connected with a control end of the controlled dimming circuit.
6. The LED dimming device of claim 1, wherein the controlled dimming circuit comprises a constant current chip U2, a MOS transistor Q5, a sampling resistor RS, a resistor R22, a resistor R30, a resistor R33, a resistor R31, a capacitor C10, a capacitor C11, a capacitor C13, a common mode inductance L4, an inductance L5, and a diode D7;
The input pin of the constant current chip U2 is connected with the third output end of the AC-DC voltage stabilizing circuit, the input pin of the constant current chip U2 is also connected with the cathode of the diode D7, the power pin of the constant current chip U2 is grounded through the capacitor C11, the control pin of the constant current chip U2 is connected with the output end of the PWM signal processing circuit, the current sampling pin of the constant current chip U2 is connected with the third output end of the AC-DC voltage stabilizing circuit through the sampling resistor RS, the current sampling pin of the constant current chip U2 is also respectively connected with the first end of the capacitor C13 and the first input end of the common mode inductor L4, and the output pin of the constant current chip U2 is respectively connected with the first end of the resistor R31 and the grid electrode of the MOS tube Q5 through the resistor R30;
the second end of the resistor R31 and the source electrode of the MOS tube Q5 are respectively grounded, and the drain electrode of the MOS tube Q5 is respectively connected with the anode of the diode D7, the second end of the capacitor C13 and the second input end of the common-mode inductor L4 through the inductor L5;
two ends of the resistor R22 are respectively connected with a first output end of the common-mode inductor L4 and a second output end of the common-mode inductor L4, and the capacitor C10 is connected with the resistor R22 in parallel;
The first output end of the common-mode inductor L4 and the second output end of the common-mode inductor L4 are respectively used as two output ends of the controlled dimming circuit and are used for being connected with an LED lamp.
7. The LED dimmer arrangement of claim 1, wherein the AC-DC voltage regulator circuit comprises an input filter rectifier sub-circuit, a transformer sub-circuit, a power switch sub-circuit, a chip power supply sub-circuit, a first output sub-circuit, and a second output sub-circuit, the transformer sub-circuit comprising a primary winding, a first secondary winding, a second secondary winding, and a third secondary winding;
the input end of the input filter rectifier circuit is used for being connected with mains supply, and the output end of the input filter rectifier circuit is respectively connected with the first end of the primary winding and the third power end of the power switch sub-circuit;
the output end of the power switch sub-circuit is connected with the second end of the primary winding;
the first end of the first secondary winding is connected with the input end of the first output sub-circuit, the second end of the first secondary winding is used for grounding, the first output end of the first output sub-circuit is connected with the first power end of the code input conversion circuit, and the second output end of the first output sub-circuit is connected with the second power end of the PWM signal processing circuit;
The first end of the second secondary winding is connected with the third power supply end through the chip electronic circuit, and the second end of the second secondary winding is used for grounding;
the first end of the third secondary winding is connected with the input end of the second output sub-circuit, the second end of the third secondary winding is used for being grounded, and the output end of the second output sub-circuit is connected with the input end of the controlled dimming circuit.
8. The LED dimmer arrangement of claim 7, wherein the first output sub-circuit comprises a voltage regulator chip U6, a diode D6, a voltage regulator diode ZD2, a transistor Q3, a resistor R19, a capacitor EC2, a parallel capacitor C9 and C20, and a parallel capacitor C21 and C22;
the anode of the diode D6 is connected with the first end of the first secondary winding, the cathode of the diode D6 is respectively connected with the first end of the capacitor EC2 and the collector of the triode Q3 through a resistor R20, the emitter of the triode Q3 is connected with the second output pin of the voltage stabilizing chip U6, the base of the triode Q3 is connected with the first end of the capacitor EC2 through a resistor R19, the base of the triode Q3 is also connected with the voltage stabilizing diode ZD2, and the anode of the voltage stabilizing diode ZD2 and the second end of the capacitor EC2 are respectively used for grounding;
One end of the capacitor C9 and one end of the capacitor C20 which are connected in parallel are connected with a second output pin of the voltage stabilizing chip U6, and the other end of the capacitor C9 and the other end of the capacitor C20 which are connected in parallel are grounded;
one end of the capacitor C21 and one end of the capacitor C22 which are connected in parallel are connected with a first output pin of the voltage stabilizing chip U6, and the other end of the capacitor C21 and the other end of the capacitor C22 which are connected in parallel are grounded;
the first output pin of the voltage stabilizing chip U6 is a first output end of the first output sub-circuit; the second output pin of the voltage stabilizing chip U6 is a second output end of the first output sub-circuit.
9. The LED dimmer arrangement of claim 7, wherein the second output subcircuit comprises a diode D5, a resistor R21 and a capacitor C4 in series, and a capacitor EC3 and a capacitor EC4 in parallel;
the resistor R21 and the capacitor C4 which are connected in series are connected with the diode D5 in parallel, the anode of the diode D5 is connected with the first end of the third secondary winding, the cathode of the diode D5 is connected with one end of the capacitor EC3 and one end of the capacitor EC4 which are connected in parallel, the other end of the capacitor EC3 and the other end of the capacitor EC4 which are connected in parallel are used for grounding, the cathode of the diode D5 is used as the output end of the second output sub-circuit, and the cathode of the diode D5 is also connected with the input end of the controlled dimming circuit.
10. An LED dimming system based on coded signals, comprising an LED luminaire and an LED dimming device according to any one of claims 1 to 9, wherein the LED luminaire is connected to an output of a controlled dimming circuit of the LED dimming device.
CN201611237190.4A 2016-12-28 2016-12-28 LED dimming device and system based on coding signals Active CN107071957B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201611237190.4A CN107071957B (en) 2016-12-28 2016-12-28 LED dimming device and system based on coding signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201611237190.4A CN107071957B (en) 2016-12-28 2016-12-28 LED dimming device and system based on coding signals

Publications (2)

Publication Number Publication Date
CN107071957A CN107071957A (en) 2017-08-18
CN107071957B true CN107071957B (en) 2023-12-12

Family

ID=59623463

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201611237190.4A Active CN107071957B (en) 2016-12-28 2016-12-28 LED dimming device and system based on coding signals

Country Status (1)

Country Link
CN (1) CN107071957B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108738203A (en) * 2018-07-13 2018-11-02 深圳安赋特科技有限公司 LED power invariable power input control circuit
CN108811261B (en) * 2018-09-13 2019-10-15 福州大学 A kind of visible light communication modulator approach of single-stage LED drive circuit
CN113436586B (en) * 2021-08-04 2023-04-25 上海商米科技集团股份有限公司 PWM voltage control circuit and method
CN113966025B (en) * 2021-10-26 2023-05-12 深圳市紫光照明技术股份有限公司 Dimming method, dimming controller and dimming control system

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001034221A (en) * 1999-07-23 2001-02-09 Nippon Seiki Co Ltd Driving circuit of organic electroluminescence element
EP1244334A2 (en) * 2001-03-22 2002-09-25 Hella KG Hueck & Co. Circuit for a LED light source
JP2004112183A (en) * 2002-09-17 2004-04-08 Sony Corp Current output digital to analog converter circuit, current output drive circuit, and image display
JP2005031700A (en) * 2004-09-27 2005-02-03 Seiko Epson Corp Display drive circuit, display panel and display device
DE102009050651A1 (en) * 2009-10-26 2011-04-28 Infineon Technologies Austria Ag Method and device for controlling the brightness of light-emitting diodes
CN204350366U (en) * 2014-12-11 2015-05-20 深圳市固特亮照明有限公司 DALI dimming power source
CN105517245A (en) * 2016-01-14 2016-04-20 东莞市川都电子科技有限公司 LED (Light-emitting Diode) constant current dimming power supply
CN205596389U (en) * 2016-03-18 2016-09-21 深圳Tcl数字技术有限公司 Constant current AC drive circuit and TV set
CN106231737A (en) * 2016-09-12 2016-12-14 惠州Tcl照明电器有限公司 PWM isolation light adjusting circuit and LED dimming drive power
CN206564712U (en) * 2016-12-28 2017-10-17 惠州Tcl照明电器有限公司 LED light modulating devices and system based on encoded signal

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2389952A (en) * 2002-06-18 2003-12-24 Cambridge Display Tech Ltd Driver circuits for electroluminescent displays with reduced power consumption
JP2005208242A (en) * 2004-01-21 2005-08-04 Nec Electronics Corp Light emitting element driving circuit

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001034221A (en) * 1999-07-23 2001-02-09 Nippon Seiki Co Ltd Driving circuit of organic electroluminescence element
EP1244334A2 (en) * 2001-03-22 2002-09-25 Hella KG Hueck & Co. Circuit for a LED light source
JP2004112183A (en) * 2002-09-17 2004-04-08 Sony Corp Current output digital to analog converter circuit, current output drive circuit, and image display
JP2005031700A (en) * 2004-09-27 2005-02-03 Seiko Epson Corp Display drive circuit, display panel and display device
DE102009050651A1 (en) * 2009-10-26 2011-04-28 Infineon Technologies Austria Ag Method and device for controlling the brightness of light-emitting diodes
CN204350366U (en) * 2014-12-11 2015-05-20 深圳市固特亮照明有限公司 DALI dimming power source
CN105517245A (en) * 2016-01-14 2016-04-20 东莞市川都电子科技有限公司 LED (Light-emitting Diode) constant current dimming power supply
CN205596389U (en) * 2016-03-18 2016-09-21 深圳Tcl数字技术有限公司 Constant current AC drive circuit and TV set
CN106231737A (en) * 2016-09-12 2016-12-14 惠州Tcl照明电器有限公司 PWM isolation light adjusting circuit and LED dimming drive power
CN206564712U (en) * 2016-12-28 2017-10-17 惠州Tcl照明电器有限公司 LED light modulating devices and system based on encoded signal

Also Published As

Publication number Publication date
CN107071957A (en) 2017-08-18

Similar Documents

Publication Publication Date Title
CN107071957B (en) LED dimming device and system based on coding signals
KR20140114885A (en) Secondary side phase-cut dimming angle detection
US10314128B2 (en) Dimming control power supply for LED lamps
US9277610B2 (en) Power converter circuit for low power illumination device, control circuit thereof and method thereof
CN210629924U (en) Dimming drive circuit and dimming drive board
US9532419B2 (en) Lighting apparatus, illumination light source, and power supply unit
CN211321556U (en) Knob switch power of mixing of colors of adjusting luminance
US20230380028A1 (en) Light dimming system
KR101954168B1 (en) Apparatus for Controlling Illuminance and Driving Method Thereof
CN206564712U (en) LED light modulating devices and system based on encoded signal
US20130038239A1 (en) Lighting Device Controlling Circuit Module
US9516710B1 (en) Light emitting diode driving device with control based on LED setting resistance
US9265099B2 (en) Power converter circuit for low power illumination device, control circuit thereof and method thereof
CN214799978U (en) Colored lamp driving circuit and lamp
CN111867192B (en) Low standby power intelligent bulb based on linear power supply
CN210579350U (en) Bluetooth control exchanges MOS pipe drive module light modulator
CN112714534A (en) Control method of intelligent lamp, computer device and computer readable storage medium
CN110099476B (en) High-integration-level high-PF intelligent dimming circuit structure
CN112601325A (en) Intelligent lamp and driving power supply thereof
CN212259388U (en) LED bluetooth is to control circuit and bluetooth ball bubble lamp
CN212319474U (en) Thing networking desk lamp
CN213280157U (en) Single-color LED lamp control circuit
US9198249B1 (en) Lighting system including a driving device for driving a lighting appliance
CN209845369U (en) Switch multistage LED dimmer circuit that discolours
CN209787512U (en) wireless remote control's dimmer

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
TA01 Transfer of patent application right
TA01 Transfer of patent application right

Effective date of registration: 20181213

Address after: 516000 No. 72 Huifeng 4th Road, Zhongkai High-tech Zone, Huizhou City, Guangdong Province (Factory Building)

Applicant after: TCL HUARUI LIGHTING TECHNOLOGY (HUIZHOU) Co.,Ltd.

Applicant after: VERY OPTOELECTRONICS (HUIZHOU) Co.,Ltd.

Address before: 516006 No. 26, No. 3 Zhongkai Avenue, Huizhou City, Guangdong Province

Applicant before: HUIZHOU TCL LIGHT ELECTRICAL APPLIANCE Co.,Ltd.

GR01 Patent grant
GR01 Patent grant