CN109195257B - Wall-controlled dimming method for LED lamp - Google Patents
Wall-controlled dimming method for LED lamp Download PDFInfo
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- CN109195257B CN109195257B CN201811144265.3A CN201811144265A CN109195257B CN 109195257 B CN109195257 B CN 109195257B CN 201811144265 A CN201811144265 A CN 201811144265A CN 109195257 B CN109195257 B CN 109195257B
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
A wall-control dimming method for an LED lamp is characterized in that dimming is realized by a single-live-wire dimming circuit of the LED lamp, which is composed of a brightness wall-control unit and a brightness adjusting driving unit. When the brightness needs to be adjusted, the brightness wall control unit controls and changes the phase shift angle of the single-live-wire output voltage waveform to send a brightness control signal, and in the brightness control signal, the brightness grade is represented by the number of continuous single-phase sine half waves with specific phase shift angles; the brightness adjusting driving unit changes the brightness of the LED lamp according to the brightness level in the brightness control signal. When the brightness wall control unit sends out the brightness control signal, the single live wire output end continuously outputs the half-wave quantity of the same phase shift angle as the brightness grade of the brightness control signal. The LED lamp dimming method can be used for replacing and upgrading a common single-live-wire control illuminating lamp.
Description
The invention discloses a wall-control dimming method of an LED lamp, which is applied by divisional application, has the original application number of 201510229502.6 and the application date of 2015, 5 and 8.
Technical Field
The invention relates to a lighting lamp technology, in particular to a wall-control dimming method for an LED lamp.
Background
Due to the non-linear characteristic of the LED lamp, the brightness of the LED lamp cannot be realized by adjusting the voltage.
When the controllable constant current source is used for adjusting the brightness of the LED lamp, the change of the working current can bring the color spectrum offset of the LED lamp, and meanwhile, the load current of the LED lamp under low brightness also becomes very low, so that the efficiency of the controllable constant current source is reduced, the temperature rise is increased, the power consumption of the loss on the driving chip is higher, and the service lives of the constant current source and the LED light source can be damaged.
The LED lamp brightness is controlled by adopting a PWM (pulse width modulation) dimming mode, so that the problems caused by a voltage regulating mode and a current regulating mode can be avoided. Currently, there are three common dimming methods for LED lamps:
firstly, the remote controller is adopted for control. The LED lamp control circuit is provided with a remote controller receiving device, and can carry out step dimming or stepless dimming on the LED lamp through the remote controller.
And secondly, adopting a digital control technology. For example, with DALI (digitally addressable lighting interface) technology, DALI system software can address individual or multiple LED fixtures on the same strong power circuit or on different circuits, with precise dimming and on-off control of individual lamps or arbitrary groups of lamps by the DALI system software. The technical scheme is advanced, but the cost is high, and the system needs to be provided with control lines besides power lines.
Thirdly, a single live wire switch on-off control technology is adopted. For example, by using the NU102 dedicated chip, the brightness of the LED lamp can be adjusted by using the switching action of a common wall switch within a predetermined time. However, the method can only provide the brightness adjustment of the 4-gear LED lamp, and the switching action has time requirements.
Disclosure of Invention
The invention aims to provide a method for wall control dimming of an LED lamp by using a single live wire without changing the wiring of the existing lighting line.
In order to achieve the purpose, the method is realized by a single live wire dimming circuit of the LED lamp.
The LED lamp single live wire dimming circuit consists of a brightness wall control unit and a brightness adjusting drive unit; the brightness wall control unit is provided with a single live wire input end and a single live wire output end, and the single live wire input end is connected to an alternating current power supply live wire; the brightness adjustment driving unit is provided with a live wire input end and a zero line input end, wherein the live wire input end is connected to the single live wire output end of the brightness wall control unit, and the zero line input end is connected to a zero line of an alternating current power supply.
The brightness wall control unit comprises a unidirectional thyristor, a DC/DC voltage stabilizer, a three-terminal voltage stabilizer, a wall control single chip microcomputer, a crystal oscillator XT1, a triode V1, a diode D01, a diode D02, a diode D03, a diode D04, a diode D1, a voltage-stabilizing tube DW01, a voltage-stabilizing tube DW1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R01, a resistor R02, a pulse potentiometer, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4.
The diode D01, the diode D02, the diode D03 and the diode D04 form a single-phase bridge rectifier circuit, and 2 alternating current input ends of the single-phase bridge rectifier circuit are respectively a single live wire input end and a single live wire output end; the positive end of the rectification output of the single-phase bridge rectification circuit is a full-wave rectification end, and the negative end of the rectification output of the single-phase bridge rectification circuit is a common ground.
The anode and the cathode of the unidirectional thyristor are respectively connected to the full-wave rectification end and the common ground, the collector of the triode V1 is connected with the anode of the voltage-stabilizing tube DW1 after being connected with the resistor R2 in series, and the cathode of the voltage-stabilizing tube DW1 is connected to the full-wave rectification end; the emitter of the triode V1 is connected to the common ground through a resistor R3; the base electrode of the triode V1 is respectively connected to one ends of the resistor R4 and the resistor R5; the other end of the resistor R4 is connected to the common ground; the emitter of the triode V1 is a trigger pulse output end which is connected to the control electrode of the unidirectional thyristor; the other end of the resistor R5 is a trigger signal input end.
The capacitor C1, the resistor R1 and the capacitor C2 form a pi-type filter circuit; the input of the pi-type filter circuit is connected to the cathode of a diode D1, and the output of the pi-type filter circuit is connected to the input end of the DC/DC voltage stabilizer; the anode of the diode D1 is connected to the full-wave rectification end; the input end of the three-terminal voltage stabilizer is connected to the output end of the DC/DC voltage stabilizer, and the output end of the three-terminal voltage stabilizer is a single live wire control power supply; the capacitor C3 is the output filter capacitor of the DC/DC voltage stabilizer, and the capacitor C4 is the output filter capacitor of the three-terminal voltage stabilizer. The single live wire control power supply is used for supplying power to the wall control single chip microcomputer.
After the resistor R01 and the resistor R02 are connected in series, the other end of the resistor R01 is connected to the full-wave rectification end, the other end of the resistor R02 is connected to the common ground, and the voltage stabilizing tube DW01 is connected to the two ends of the resistor R02 in parallel; the serial connection point of the resistor R01 and the resistor R02 is the output end of the phase-shifting sampling pulse.
The common terminal of the pulse potentiometer is connected to the common ground, and the pulse output terminal outputs a brightness given signal.
The brightness given signal input end of the wall control singlechip is connected to the pulse output end of the pulse potentiometer; the phase-shifting sampling pulse input end of the wall-control single chip microcomputer is connected to the phase-shifting sampling pulse output end; and a trigger signal output end of the wall control single chip microcomputer is connected to a trigger signal input end.
The brightness wall control unit sends a brightness control signal by controlling a phase shift angle of a voltage waveform output by the output end of the single live wire, and the brightness control signal has 1-N of brightness and N brightness levels; n is an integer of 2 or more. A typical value for N is 8.
The method for sending the brightness control signal is realized by a wall control single chip microcomputer, and specifically comprises the following steps:
step A, setting the brightness level of a brightness control signal as brightness 1;
step B, sending out a primary brightness control signal;
step C, judging whether the brightness is changed or not, changing the brightness, and returning to the step B; and D, the brightness is not changed, the state of not sending the brightness control signal is maintained, and the step C is returned.
And the state of not sending out a brightness control signal is maintained, and the single-phase sine half wave with positive and negative half-wave phase shift angles of alpha is output by the output end of the single live wire.
The single-phase sinusoidal half waves with phase shift angles of beta are output by continuous K half waves at the output end of the single live wire after the primary brightness control signal is sent out, and the brightness level of the sent brightness control signal is brightness K; k is an integer of 1 or more and N or less.
The phase shift angle beta is greater than the phase shift angle alpha. Typical values are a phase shift angle α of 4 ° and a phase shift angle β of 30 °.
The alternating current power supply is single-phase 220V alternating current.
The method is that the trigger signal output by the wall control single chip microcomputer always keeps high level effective.
The phase shift angle β is controlled by selecting the voltage division ratio between the resistor R01 and the resistor R02 so that the voltage at the full-wave rectification end rises to a level at which the phase-shifted sampling pulse after voltage division changes from low level to high level when the phase shift angle β is reached.
The single-phase sine half-wave with the phase shift angle beta adopts a phase shift sampling pulse triggering mode; the phase-shifting sampling pulse is generated by inputting low level at the input end of a trigger signal before the alternating current power supply crosses zero, stopping sending an effective trigger signal by the wall-control single chip microcomputer, and switching off the unidirectional thyristor after the alternating current power supply crosses zero; when the phase shift angle reaches beta, the output end of the phase shift sampling pulse is changed from low level to high level; the phase-shifting sampling pulse triggering mode is that when the output end of the phase-shifting sampling pulse is changed from low level to high level, the high level is input at the input end of a triggering signal, and the wall-control single chip microcomputer sends out an effective triggering signal to enable the unidirectional thyristor to be conducted; after the unidirectional thyristor is conducted, the phase-shifting sampling pulse output end is changed from high level to low level. Repeating this process can repeat the control of the phase shift angle to β.
The brightness adjusting driving unit receives the brightness control signal and adjusts the brightness of the LED lamp through the brightness signal receiving module, and the method comprises the following steps:
step one, setting the brightness level of a brightness control signal as brightness 1;
adjusting the brightness of the LED;
judging whether a single live wire has a brightness control signal or not; if no brightness control signal exists, returning to the third step; if the brightness control signal exists, turning to the step four;
step four, receiving a brightness control signal and determining the brightness level;
and step five, returning to the step two.
Judging whether a brightness control signal exists on the single live wire or not by judging whether a single-phase sine half-wave with a phase shift angle beta exists at the input end of the live wire or not; the method comprises the steps of judging the number of continuous single-phase sine half waves with the phase shift angle beta, wherein K continuous single-phase sine half waves with the phase shift angle beta are provided, and the brightness level of the brightness control signal is the brightness K.
The brightness adjusting driving unit consists of a single-phase rectifying voltage-stabilizing power supply module, a brightness signal receiving module and a brightness driving module.
The single-phase rectification voltage-stabilizing power supply module consists of a single-phase transformer, a single-phase rectifier bridge circuit and a filtering voltage-stabilizing circuit; the input end of the single-phase transformer is connected to the input end of the live wire and the input end of the zero line; the output end of the single-phase transformer is connected to the alternating current input end of the single-phase rectifier bridge circuit; the positive end of the rectification output of the single-phase rectifier bridge circuit is a direct-current working power supply, and the negative end of the rectification output of the single-phase rectifier bridge circuit is a reference ground; the input end of the filtering voltage stabilizing circuit is connected to a direct current working power supply; the output end of the filtering voltage stabilizing circuit outputs and adjusts a direct current power supply to supply power to the brightness signal receiving module.
The brightness signal receiving module consists of a minimum system for adjusting the single chip microcomputer and a brightness signal sampling and shaping circuit.
And the minimum system of the regulating singlechip is provided with a pulse capture input end and a PWM pulse output end.
The brightness signal sampling and shaping circuit consists of a full-wave rectifying circuit and a voltage stabilizing tube amplitude limiting circuit; the input end of the full-wave rectifying circuit is connected to the output end of the single-phase transformer; the input end of the voltage stabilizing tube amplitude limiting circuit is connected to the output end of the full-wave rectification circuit, and the output end of the voltage stabilizing tube amplitude limiting circuit is connected to the pulse capture input end of the minimum system of the regulating single chip microcomputer.
The LED driving module is provided with a direct current input end, an LED lamp driving end and a PWM brightness adjusting signal input end; the direct current input end of the LED driving module is connected to a direct current working power supply, the PWM brightness adjusting signal input end is connected to the PWM pulse output end of the minimum system of the adjusting single chip microcomputer, and the LED lamp driving end is connected to the LED lamp.
The invention has the advantages that the specific circuit of the brightness wall control unit is serially connected on a single live wire and can generate and send the brightness control signal of the brightness grade consisting of the given phase shift angle waveform, the brightness of the LED lamp is controlled by adopting a single live wire mode, a remote controller is not needed, a control wire is not needed, a power line is not needed to be laid again, and the replacement and upgrade of a common illuminating lamp can be realized; the brightness of the LED lamp can be divided into any levels according to the requirement; the brightness control signal is sent in a small-angle phase shifting mode only when the brightness is changed, the number of half-waves continuously outputting the same phase shifting angle is the brightness level of the brightness control signal, the time is short, and the LED lamp cannot flicker. The technical means of acquiring the trigger synchronous signal of the alternating current power supply on the single live wire adopted in the brightness wall control unit does not increase the variation of the output voltage waveform on the single live wire.
Drawings
Fig. 1 is a block diagram of a system configuration.
FIG. 2 is a circuit diagram of an embodiment of a brightness wall control unit.
Fig. 3 is a waveform example when the luminance wall control unit maintains a state of not transmitting the luminance control signal.
Fig. 4 is a waveform example when the luminance wall control unit transmits the luminance control signal.
Fig. 5 is a flow chart of sending a brightness control signal.
Fig. 6 is a luminance control signal transmission control method.
Fig. 7 is a structural view of a luminance adjustment driving unit.
Fig. 8 is a brightness adjustment driving unit embodiment.
Fig. 9 is a brightness control signal receiving method.
Detailed Description
The present invention will be described in further detail below with reference to examples by way of drawings, but the embodiments of the present invention are not limited thereto.
The structure of the embodiment of the LED lamp single live wire dimming circuit for realizing the method is shown in figure 1 and is formed by connecting a brightness wall control unit and a brightness adjusting drive unit in series. The brightness wall control unit enters a single live wire L and exits the single live wire L1; the live wire L1 of the brightness adjustment driving unit enters, and the zero wire N exits.
An embodiment circuit of the brightness wall control unit is shown in fig. 2 and comprises a unidirectional thyristor V01, a DC/DC voltage stabilizer U1, a three-terminal voltage stabilizer U2, a wall control single chip microcomputer U3, a crystal oscillator XT1, a triode V1, a diode D01, a diode D02, a diode D03, a diode D04, a diode D1, a voltage regulator DW01, a voltage regulator DW1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R01, a resistor R02, a pulse potentiometer WP, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4.
Diode D01, diode D02, diode D03, diode D04 constitute a single-phase bridge rectifier circuit, and 2 alternating current input ends of the single-phase bridge rectifier circuit are respectively a single live wire input end L and a single live wire output end L1. The positive rectification output end of the single-phase bridge rectification circuit is a full-wave rectification end A, and the negative rectification output end of the single-phase bridge rectification circuit is a common ground.
The anode and the cathode of the unidirectional thyristor V01 are respectively connected to the full-wave rectification end A and the common ground, the collector of the triode V1 is connected with the resistor R2 in series and then connected to the anode of the voltage-regulator tube DW1, and the cathode of the voltage-regulator tube DW1 is connected to the full-wave rectification end A; the emitter of the triode V1 is connected to the common ground through a resistor R3; the base electrode of the triode V1 is respectively connected to one ends of the resistor R4 and the resistor R5; the other end of the resistor R4 is connected to the common ground; the emitter of the triode V1 is a trigger pulse output end which is connected to the control electrode of the unidirectional thyristor V01; the other end of the resistor R5 is a trigger signal input end.
The capacitor C1, the resistor R1 and the capacitor C2 form a pi-type filter circuit; the input of the pi-type filter circuit is connected to the cathode of a diode D1, and the output of the pi-type filter circuit is connected to the input end of a DC/DC voltage stabilizer U1; the anode of the diode D1 is connected to the full-wave rectification terminal A; the input end of the three-terminal voltage regulator U2 is connected to the output end of the DC/DC voltage regulator U1, and the output end is a single live wire control power supply VDD; the capacitor C3 is an output filter capacitor of the DC/DC voltage regulator U1, and the capacitor C4 is an output filter capacitor of the three-terminal voltage regulator U2.
The model of the DC/DC voltage regulator U1 is DY10, and the model of the three-terminal voltage regulator U2 is HT 7133.
HT7133 outputs a +3.3V voltage. If the output voltage of the DC/DC voltage regulator U1 meets the power supply requirement of the wall-control single chip microcomputer U3, the three-terminal voltage regulator U2 can be omitted. The DC/DC regulator U1 may also be selected from other DC/DC regulators having a wide range of voltage input characteristics.
After the resistor R01 and the resistor R02 are connected in series, the other end of the resistor R01 is connected to the full-wave rectification end A, the other end of the resistor R02 is connected to the common ground, and the voltage stabilizing tube DW01 is connected in parallel to the two ends of the resistor R02. The serial connection point of the resistor R01 and the resistor R02 is the output end of the phase-shifting sampling pulse, and the voltage-stabilizing tube DW01 carries out amplitude limiting on the phase-shifting sampling pulse.
The common terminal COM of the pulse potentiometer WP is connected to a common ground for outputting a luminance given signal. When the pulse potentiometer WP rotates, the luminance setting signals output by the pulse output terminal SL and the pulse output terminal SR are pulses having a phase difference of 90 °.
The wall-control singlechip U3 and the crystal oscillator XT1 form a singlechip minimum system. In the embodiment of fig. 2, P2.0 and P2.1 of the wall-control single chip microcomputer U3 are input terminals of a brightness setting signal, and are respectively connected to a pulse output terminal SL and a pulse output terminal SR of a pulse potentiometer WP; p2.2 is a phase-shift sampling pulse input end connected to the phase-shift sampling pulse output end, i.e. a serial connection point of a resistor R01 and a resistor R02; p1.1 is the trigger signal output terminal connected to the trigger signal input terminal of the resistor R5. The model of the wall-control single chip microcomputer U3 is MSP430G 2553.
The brightness wall control unit sends the brightness control signal by controlling the phase shift angle of the output voltage waveform of the single live wire output end L1. In the brightness control signal, the brightness level is represented by the number of continuous single-phase sine half waves with a specific phase shift angle; the brightness control signals have 1-N brightness in total, and N brightness in total; n is an integer of 2 or more, typically 8.
The brightness control signal is only sent under the control of the brightness wall control unit when the brightness given signal exists in the rotary pulse potentiometer WP. When the brightness wall control unit maintains the state of not sending the brightness control signal, an uninterrupted triggering mode is adopted, the triggering signal is always kept effective, namely the wall control single chip microcomputer U3 continuously sends out the uninterrupted triggering signal, and the waveforms of all key points of the brightness wall control unit are shown in figure 3.
When the alternating current power supply crosses zero, the unidirectional thyristor V01 is turned off, after the alternating current power supply crosses zero, although the wall-controlled single chip microcomputer U3 continuously sends out an uninterrupted trigger signal to maintain that the trigger signal is in a high-level state, the triode V1 is conducted only when the voltage of the full-wave rectifying end A is greater than the voltage stabilizing value of the voltage stabilizing tube DW1, and the unidirectional thyristor V01 can be triggered and conducted.When the voltage stabilizing value of the voltage stabilizing tube DW1 is 20V, the phase shift angle α is 4 degrees, and fig. 3(c) shows that the wall control single chip microcomputer U3 continuously sends out uninterrupted trigger signals, and the voltage U at the point B of the phase shift sampling pulse output end isBIn the schematic diagram, at this time, the voltage at the point B cannot reach the high level threshold level because the voltage at the full-wave rectification terminal a is low, and the output terminal of the phase-shifted sampling pulse is maintained at the low level state.
An example of the waveform when the brightness wall control unit transmits the brightness control signal is shown in fig. 4. Fig. 4 transmits a luminance control signal of luminance 3.
The flow of the wall control single chip microcomputer U3 sending out a primary brightness control signal is shown in FIG. 5, and the steps are as follows:
step 4, if the brightness control signal is not sent, turning to the step 1; otherwise, ending the sending of the brightness control signal and entering a state of maintaining the brightness control signal not to be sent.
When the wall-control single chip microcomputer U3 stops sending a trigger signal, the next alternating current power supply crosses the zero point, and the unidirectional thyristor V01 is turned off; namely, before the zero crossing point of the alternating current power supply, the trigger signal is output to be low level, and then the unidirectional thyristor V01 is turned off at the zero crossing point of the alternating current power supply; after the zero crossing, even if the phase shift angle α is reached, because there is no trigger signal, the unidirectional thyristor V01 is still turned off, and the voltage of the full-wave rectification terminal a continues to rise. The voltage division ratio of the resistor R01 and the resistor R02 is properly selected so that when the voltage reaches the phase shift angle beta, the voltage at the full-wave rectification end A rises to change the phase-shifted sampling pulse after voltage division from low level to high level. After the wall-control single chip microcomputer U3 receives the high-level phase-shifting sampling pulse signal, the trigger signal output end is made to output high level, the trigger signal is sent out, the unidirectional thyristor V01 is conducted, the phase-shifting sampling pulse disappears, and the low level is changed. If the brightness control signal is the brightness K, repeating the process K times, and finishing the sending of the brightness control signal. The typical value of the phase shift angle beta is 30 degrees, and the high level threshold of the phase shift sampling pulse is 1.5V, so that the value of the resistor R01 is 100 times that of the resistor R02. Sending a primary brightness control signal, wherein the single-phase sinusoidal half waves with phase shift angles of beta are output by L1 continuous K half waves at the output end of the single live wire, and the sent brightness control signal is the brightness K; k is an integer of 1 or more and N or less. The phase shift angle beta is greater than the phase shift angle alpha.
The brightness control signal transmitted in fig. 4 is brightness 3, fig. 4(a) is an ac voltage waveform of the simplex output terminal L1 during transmission, and fig. 4(b) is a voltage waveform of the full-wave rectifying terminal a during transmission. Fig. 4(c) is a schematic diagram of the phase-shifted sampling pulse during transmission, and when fig. 4(c) is drawn, pulse 1, pulse 2, and pulse 3 are all idealized, i.e., low level processing is performed when the signal is lower than the high level threshold, and high level processing is performed when the signal is higher than the high level threshold.
The method for sending the brightness control signal by the brightness wall control unit is shown in fig. 6, and comprises the following steps:
step A, setting the brightness level of a brightness control signal as brightness 1;
step B, sending out a primary brightness control signal;
step C, judging whether the brightness is changed or not, changing the brightness, and returning to the step B; and D, the brightness is not changed, the state of not sending the brightness control signal is maintained, and the step C is returned.
The structure of the brightness adjustment driving unit is shown in fig. 7, and the brightness adjustment driving unit is composed of a single-phase rectification voltage-stabilized power supply module, a brightness signal receiving module and a brightness driving module.
The single-phase rectification voltage-stabilizing power supply module consists of a single-phase transformer, a single-phase rectifier bridge circuit and a filtering voltage-stabilizing circuit; the input end of the single-phase transformer is connected to a live wire input end L1 and a zero line input end N; the output end of the single-phase transformer is connected to the alternating current input end of the single-phase rectifier bridge circuit; the positive end of the rectification output of the single-phase rectifier bridge circuit is a direct-current working power supply, and the negative end of the rectification output of the single-phase rectifier bridge circuit is a reference ground; the input end of the filtering voltage stabilizing circuit is connected to a direct current working power supply; the filtering voltage stabilizing circuit outputs and adjusts a direct current power supply and supplies power to the brightness signal receiving module.
The brightness signal receiving module consists of a minimum system of a regulating singlechip and a brightness signal sampling and shaping circuit, wherein the minimum system of the regulating singlechip is provided with a pulse capture input end and a PWM pulse output end.
The brightness signal sampling and shaping circuit consists of a full-wave rectifying circuit and a voltage-stabilizing tube amplitude limiting circuit; the input end of the full-wave rectifying circuit is connected to the output end of the single-phase transformer. The input end of the voltage stabilizing tube amplitude limiting circuit is connected to the output end of the full-wave rectification circuit, and the output end of the voltage stabilizing tube amplitude limiting circuit is connected to the pulse capture input end of the minimum system of the single chip microcomputer.
The LED driving module is provided with a direct current input end, an LED lamp driving end and a PWM brightness adjusting signal input end. The direct current input end of the LED driving module is connected to a direct current working power supply, the PWM brightness adjusting signal input end is connected to the PWM pulse output end of the adjusting single chip microcomputer, and the LED lamp driving end is connected to the LED lamp.
An embodiment of the brightness adjustment driving unit is shown in fig. 8.
In the embodiment shown in fig. 8, the single-phase rectification voltage-stabilized power supply module is composed of a single-phase transformer TC, a diode D05, a diode D06, a diode D07, a diode D08, a capacitor C5, a resistor R03, and a voltage-stabilizing tube DW 02. The diode D05, the diode D06, the diode D07 and the diode D08 form a single-phase rectifier bridge circuit, and the capacitor C5, the resistor R03 and the voltage regulator DW02 form a filtering voltage regulator circuit. The capacitor C5 filters the output of the single-phase rectifier bridge to obtain a dc working power supply VIN, and the regulator tube DW02 outputs a regulated dc power supply VCC.
In the embodiment shown in fig. 8, the luminance signal receiving module is composed of a regulating single chip microcomputer U4, a crystal oscillator XT2, a diode D09, a diode D10, a resistor R6, a resistor R7, and a voltage regulator DW 2. The adjusting single chip microcomputer U4 and the crystal oscillator XT2 form a single chip microcomputer minimum system, P2.0 of the adjusting single chip microcomputer U4 is a pulse capture input end, and P1.2 is a PWM pulse output end. The diode D09 and the diode D10 form a full-wave rectification circuit, the anodes of the diode D09 and the diode D10 are respectively connected to the output ends L2 and N2 of the single-phase transformer, and the cathodes of the diode D09 and the diode D10 are connected to the output end of the full-wave rectification circuit. And the resistor R6, the resistor R7 and the voltage regulator tube DW2 form a voltage regulator tube amplitude limiting circuit. One end of the resistor R6 is connected with the cathode of the voltage-regulator tube DW2 to form the output end of the voltage-regulator tube amplitude limiting circuit and is connected to the pulse capture input end of the regulating singlechip U4. The other end of the resistor R6 is the input end of the voltage regulator tube amplitude limiting circuit and is connected to the output end of the full-wave rectification circuit. The anode of the voltage regulator tube DW2 is connected to the reference ground, and the resistor R7 is connected in parallel to the two ends of the voltage regulator tube DW 2.
The model of the adjusting single chip microcomputer U4 is MSP430G 2553. The wall control single chip microcomputer U3 and the adjusting single chip microcomputer U4 can also select other MSP430 series low-power consumption single chip microcomputers.
In the embodiment shown in fig. 8, the luminance driving module is composed of an LED constant current driver U5, an inductor LG, a resistor R8, and a fast recovery diode D2, and the model of the LED constant current driver is PT 4115. Two ends of the resistor R8 are respectively connected to a power supply voltage end VIN and an output current sensing end SEN of the LED constant current driver U5; the cathode of the fast recovery diode D2 is connected to the power supply voltage end VIN of the LED constant current driver U5, and the anode of the fast recovery diode D2 is connected to the switch output end SW of the LED constant current driver U5; one end of the inductor LG is connected to a switch output end SW of the LED constant current driver U5; the other end of the output current sensing end SEN and the other end of the inductor LG of the LED constant current driver U5 are LED lamp driving ends; a power supply voltage end VIN of the LED constant current driver U5 is a direct current input end of the LED driving module; the dimming control terminal DIM of the LED constant current driver U5 is the PWM brightness adjustment signal input terminal.
Fig. 9 is a brightness control signal receiving method. The brightness adjusting driving unit receives the brightness control signal and adjusts the brightness of the LED lamp through the brightness signal receiving module, and the method comprises the following steps:
step one, setting the brightness level of a brightness control signal as brightness 1;
adjusting the brightness of the LED;
judging whether a single live wire has a brightness control signal or not; if no brightness control signal exists, returning to the third step; if the brightness control signal exists, turning to the step four;
step four, receiving a brightness control signal;
and step five, returning to the step two.
Judging whether a brightness control signal exists on a single live wire or not by judging whether a single-phase sine half-wave with a phase shift angle beta exists at the input end L1 of the live wire or not; and receiving a brightness control signal, wherein the method is to judge the number of continuous single-phase sine half-waves with the phase shift angle beta, K continuous single-phase sine half-waves with the phase shift angle beta are provided, and the brightness control signal is the brightness K. The luminance signal sampling and shaping circuit converts the ac voltage at the hot input terminal L1 into a rectangular wave, as shown in fig. 4 (d). The phase shift angle α and the phase shift angle β correspond to the negative pulse shown in fig. 4(d), in which the phase shift angle α corresponds to the pulse 4, the pulse 8, and the pulse 9, and is a negative pulse with a narrower width; the phase shift angle β corresponds to pulse 5, pulse 6, and pulse 7, and is a negative pulse having a wide width. The brightness signal receiving module can judge whether the input end L1 of the live wire has a single-phase sine half-wave with a phase shift angle beta only by judging the width of the negative pulse sent to the minimum system pulse capture input end of the adjusting singlechip; and calculating the number of single-phase sine half waves with the phase shift angle beta to obtain a brightness control signal.
In fig. 4, the time when the wall-control single chip microcomputer U3 stops sending the trigger signal for the 1 st time is at the positive half-wave of the ac power source, so the 1 st single-phase sinusoidal half-wave with the phase shift angle β at the live wire input end L1 is the negative half-wave. Because the time when the wall control single chip microcomputer U3 stops sending the trigger signal for the 1 st time is random, the time when the trigger signal for the 1 st time stops sending may also be the negative half-wave of the AC power supply, and at this time, the 1 st single-phase sinusoidal half-wave with the phase shift angle beta at the live wire input end L1 is changed into the positive half-wave. Because the brightness signal sampling and shaping circuit firstly rectifies the alternating voltage at the input end L1 of the live wire and then converts the rectified alternating voltage into a rectangular wave, the 1 st single-phase sine half-wave with the phase shift angle beta is a positive half-wave or a negative half-wave, and the judgment and the receiving of the brightness control signal by the brightness adjusting driving unit are not influenced.
Claims (7)
1. A wall-control dimming method of an LED lamp is realized by a single-live-wire dimming circuit of the LED lamp, and is characterized in that:
the LED lamp single live wire dimming circuit consists of a brightness wall control unit and a brightness adjusting drive unit; the brightness wall control unit is provided with a single live wire input end and a single live wire output end, and the single live wire input end is connected to an alternating current power supply live wire; the brightness adjustment driving unit is provided with a live wire input end and a zero line input end, wherein the live wire input end is connected to the single live wire output end of the brightness wall control unit, and the zero line input end is connected to a zero line of an alternating current power supply;
the brightness wall control unit comprises a unidirectional thyristor, a DC/DC voltage stabilizer, a three-terminal voltage stabilizer, a wall control single chip microcomputer, a crystal oscillator XT1, a triode V1, a diode D01, a diode D02, a diode D03, a diode D04, a diode D1, a voltage-stabilizing tube DW01, a voltage-stabilizing tube DW1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R01, a resistor R02, a pulse potentiometer, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4;
the diode D01, the diode D02, the diode D03 and the diode D04 form a single-phase bridge rectifier circuit, and 2 alternating current input ends of the single-phase bridge rectifier circuit are respectively a single live wire input end and a single live wire output end; the positive rectification output end of the single-phase bridge rectification circuit is a full-wave rectification end, and the negative rectification output end of the single-phase bridge rectification circuit is a common ground;
the anode and the cathode of the unidirectional thyristor are respectively connected to the full-wave rectification end and the common ground, the collector of the triode V1 is connected with the anode of the voltage-stabilizing tube DW1 after being connected with the resistor R2 in series, and the cathode of the voltage-stabilizing tube DW1 is connected to the full-wave rectification end; the emitter of the triode V1 is connected to the common ground through a resistor R3; the base electrode of the triode V1 is respectively connected to one ends of the resistor R4 and the resistor R5; the other end of the resistor R4 is connected to the common ground; an emitter of the triode V1 is connected to a control electrode of the unidirectional thyristor; the other end of the resistor R5 is a trigger signal input end;
the capacitor C1, the resistor R1 and the capacitor C2 form a pi-type filter circuit; the input of the pi-type filter circuit is connected to the cathode of a diode D1, and the output of the pi-type filter circuit is connected to the input end of the DC/DC voltage stabilizer; the anode of the diode D1 is connected to the full-wave rectification end; the input end of the three-terminal voltage stabilizer is connected to the output end of the DC/DC voltage stabilizer, and the output end of the three-terminal voltage stabilizer is a single live wire control power supply; the capacitor C3 is an output filter capacitor of the DC/DC voltage stabilizer, and the capacitor C4 is an output filter capacitor of the three-terminal voltage stabilizer;
after the resistor R01 and the resistor R02 are connected in series, the other end of the resistor R01 is connected to the full-wave rectification end, the other end of the resistor R02 is connected to the common ground, and the voltage stabilizing tube DW01 is connected to the two ends of the resistor R02 in parallel; the serial connection point of the resistor R01 and the resistor R02 is a phase-shifting sampling pulse output end;
the common end of the pulse potentiometer is connected to the common ground, and the pulse output end outputs a brightness given signal;
the brightness given signal input end of the wall control single chip microcomputer is connected to the pulse output end of the pulse potentiometer, the phase-shifting sampling pulse input end is connected to the phase-shifting sampling pulse output end, and the trigger signal output end is connected to the trigger signal input end;
the brightness wall control unit sends a brightness control signal by controlling a phase shift angle of a voltage waveform output by the output end of the single live wire, and the brightness control signal has 1-N of brightness and N brightness levels; n is an integer greater than or equal to 2;
the method for sending the brightness control signal is realized by a wall control single chip microcomputer, and specifically comprises the following steps:
step A, setting the brightness level of a brightness control signal as brightness 1;
step B, sending out a primary brightness control signal;
step C, judging whether the brightness is changed or not, changing the brightness, and returning to the step B; the brightness is not changed, the state of not sending out the brightness control signal is maintained, and the step C is returned;
the state that the brightness control signal is not sent out is maintained, and the single-phase sine half wave with positive and negative half-wave phase shifting angles of alpha is output by the output end of the single live wire; the single-phase sinusoidal half waves with phase shift angles of beta are output by continuous K half waves at the output end of the single live wire after the primary brightness control signal is sent out;
the method is characterized in that a single-phase sine half wave with positive and negative half-wave phase shift angles alpha output by a single-live wire output end is continuously triggered, and the specific method is that a trigger signal output by a wall control single chip microcomputer is always kept effective;
the phase shift angle beta is greater than the phase shift angle alpha; the method for controlling the phase shift angle to be beta is that the voltage division ratio of a resistor R01 and a resistor R02 is selected, when the phase shift angle reaches beta, the voltage at the full-wave rectification end rises to enable the phase shift sampling pulse after voltage division to be changed from low level to high level;
the single-phase sine half-wave with the phase shift angle beta adopts a phase shift sampling pulse triggering mode; the phase-shifting sampling pulse is generated by that before the AC power supply crosses zero, the wall-control single chip microcomputer stops sending a trigger signal, and the unidirectional thyristor is turned off after the AC power supply crosses zero; when the phase shift angle reaches beta, the output end of the phase shift sampling pulse is changed from low level to high level; the phase-shifting sampling pulse triggering mode is that when the phase-shifting sampling pulse output end is changed from low level to high level, the wall control single chip microcomputer sends out a triggering signal to enable the unidirectional thyristor to be conducted; after the unidirectional thyristor is conducted, the phase-shifting sampling pulse output end is changed from high level to low level.
2. The wall-control dimming method of the LED lamp according to claim 1, wherein:
the single-phase sinusoidal half waves with phase shift angles of beta are output by K continuous half waves at the output end of the single live wire, and the brightness level of the sent brightness control signal is brightness K; k is an integer of 1 or more and N or less.
3. The wall-control dimming method of the LED lamp according to any one of claims 1-2, wherein:
the brightness adjusting driving unit receives the brightness control signal and adjusts the brightness of the LED lamp through the brightness signal receiving module, and the method comprises the following steps:
step one, setting the brightness level of a brightness control signal as brightness 1;
adjusting the brightness of the LED;
judging whether a single live wire has a brightness control signal or not; if no brightness control signal exists, returning to the third step; if the brightness control signal exists, turning to the step four;
step four, receiving a brightness control signal and determining the brightness level;
and step five, returning to the step two.
4. The wall-control dimming method of the LED lamp according to claim 3, wherein:
judging whether a brightness control signal exists on the single live wire or not by judging whether a single-phase sine half-wave with a phase shift angle beta exists at the input end of the live wire or not; the method comprises the steps of judging the number of continuous single-phase sine half waves with the phase shift angle beta, wherein K continuous single-phase sine half waves with the phase shift angle beta are provided, and the brightness level of the brightness control signal is the brightness K.
5. The LED lamp wall-control dimming method according to claim 4, wherein: the brightness adjusting driving unit consists of a single-phase rectifying voltage-stabilizing power supply module, a brightness signal receiving module and a brightness driving module;
the single-phase rectification voltage-stabilizing power supply module consists of a single-phase transformer, a single-phase rectifier bridge circuit and a filtering voltage-stabilizing circuit; the input end of the single-phase transformer is connected to the input end of the live wire and the input end of the zero line; the output end of the single-phase transformer is connected to the alternating current input end of the single-phase rectifier bridge circuit; the positive end of the rectification output of the single-phase rectifier bridge circuit is a direct-current working power supply, and the negative end of the rectification output of the single-phase rectifier bridge circuit is a reference ground; the input end of the filtering voltage stabilizing circuit is connected to a direct current working power supply; the output end of the filtering voltage stabilizing circuit outputs and adjusts a direct current power supply to supply power to the brightness signal receiving module;
the brightness signal receiving module consists of a minimum system for adjusting the single chip microcomputer and a brightness signal sampling and shaping circuit;
the minimum system of the regulating singlechip is provided with a pulse capture input end and a PWM pulse output end;
the brightness signal sampling and shaping circuit consists of a full-wave rectifying circuit and a voltage stabilizing tube amplitude limiting circuit; the input end of the full-wave rectifying circuit is connected to the output end of the single-phase transformer; the input end of the voltage stabilizing tube amplitude limiting circuit is connected to the output end of the full-wave rectification circuit, and the output end of the voltage stabilizing tube amplitude limiting circuit is connected to the pulse capture input end of the minimum system of the regulating single chip microcomputer;
the brightness driving module is provided with a direct current input end, an LED lamp driving end and a PWM brightness adjusting signal input end; the direct current input end of the brightness driving module is connected to a direct current working power supply, the PWM brightness adjusting signal input end is connected to the PWM pulse output end of the minimum system of the adjusting single chip microcomputer, and the LED lamp driving end is connected to the LED lamp.
6. The wall-control dimming method of the LED lamp according to any one of claims 1-2, wherein: the phase shift angle α is 4 ° and the phase shift angle β is 30 °.
7. The wall-control dimming method of the LED lamp according to any one of claims 1-2, wherein: and N is 8.
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| CN201811144135.XA Active CN109195256B (en) | 2015-05-08 | 2015-05-08 | Method for controlling phase shifting angle on single live wire |
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| CN104837257A (en) | 2015-08-12 |
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