CN113163550A - Dimming high-compatibility LED driving power supply and control method thereof - Google Patents

Dimming high-compatibility LED driving power supply and control method thereof Download PDF

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CN113163550A
CN113163550A CN202110412541.5A CN202110412541A CN113163550A CN 113163550 A CN113163550 A CN 113163550A CN 202110412541 A CN202110412541 A CN 202110412541A CN 113163550 A CN113163550 A CN 113163550A
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circuit
voltage
power supply
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output
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CN113163550B (en
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杨建华
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Shenzhen Hengyao Lighting Technology Co ltd
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Shenzhen Hengyao Lighting Technology Co ltd
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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
    • 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
    • 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
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]
    • 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
    • H05B45/34—Voltage stabilisation; Maintaining constant voltage
    • 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
    • H05B45/36—Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
    • 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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  • Electromagnetism (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The application relates to a dimming high-compatibility LED driving power supply and a control method thereof, wherein the dimming high-compatibility LED driving power supply comprises an input circuit, a first control circuit and a second control circuit, wherein the input circuit is connected with the output end of a silicon controlled dimmer and is used for inputting a first analog signal; the rectifying circuit is connected with the input circuit and used for receiving the first analog signal, performing rectification processing on the first analog signal and outputting a second analog signal; the conversion circuit is used for receiving the second analog signal, executing analog-to-digital conversion processing and outputting a sampling signal; the output circuit is connected with the mains supply and used for supplying power to the LED lamp; and the trimming circuit is connected with the conversion circuit and the output circuit and used for receiving the sampling signal and controlling the power supply of the output circuit according to the sampling signal. The LED dimming control circuit has the effect of reducing the interference phenomenon of the silicon controlled rectifier dimmer to the LED load so as to improve the stability of LED dimming.

Description

Dimming high-compatibility LED driving power supply and control method thereof
Technical Field
The application relates to the field of LED driving, in particular to a dimming high-compatibility LED driving power supply and a control method thereof.
Background
Thyristor dimming is actually divided into two categories, one being Triac dimming, also known as leading-edge phase-cut dimming, and the other being reverse-phase control dimmer (i.e., trailing-edge phase-cut dimmer), also known as ELV dimming. The operating principle of leading-edge controllable dimming TRIAC dimming is that a tangential output voltage waveform is generated after the waveform of an input voltage passes through a conduction angle switching wave. By applying the tangential principle, the effective value of the output voltage can be reduced, so that the power of a common load (a resistance load) is reduced.
In view of the above related arts, the inventor believes that although the scr dimmer can adjust the LED brightness by controlling the phase, the input waveform after phase cutting is easy to generate many interference signals, such as spikes, etc., which causes the LED brightness to be unstable, and even causes the defects of LED extinction and damage, etc.
Disclosure of Invention
First aspect, in order to reduce the interference phenomenon of silicon controlled rectifier dimmer to the LED load, promote the stability that LED was adjusted luminance, this application provides a high compatible LED drive power supply adjusts luminance.
The application provides a high compatible LED drive power supply adjusts luminance adopts following technical scheme:
a dimming high-compatibility LED driving power supply comprises,
the input circuit is connected with the output end of the silicon controlled dimmer and is used for inputting a first analog signal, and the input end of the silicon controlled dimmer is connected with mains supply;
the rectifying circuit is connected with the input circuit and used for receiving the first analog signal, performing rectification processing on the first analog signal and outputting a second analog signal;
the conversion circuit is connected with the rectification circuit and used for receiving the second analog signal, executing analog-to-digital conversion processing and outputting a sampling signal;
the output circuit is connected with the mains supply and used for supplying power to the LED lamp; and
and the trimming circuit is connected with the conversion circuit and the output circuit and used for receiving the sampling signal and controlling the power supply of the output circuit according to the sampling signal.
By adopting the technical scheme, the input circuit is connected with the mains supply through the silicon controlled dimmer, the phase of the mains supply is changed after passing through the silicon controlled dimmer, the brightness of the LED lamp can be controlled by controlling the conduction angle of the input waveform, and the input waveform is interfered by the silicon controlled; therefore, the first analog signal output by the silicon controlled rectifier dimmer is rectified by the rectifying circuit to obtain a second analog signal, and then the second analog signal is subjected to analog-to-digital conversion by the conversion circuit, so that signal processing is facilitated; the trimming circuit carries out PWM dimming on the LED load according to the sampling signal, namely the signal which represents the input waveform adjusted by the silicon controlled rectifier dimmer, and adjusts the switching frequency of the LED load, so that the interference of the silicon controlled rectifier dimmer on the input waveform is reduced while the brightness of the LED lamp is adjusted, and the running stability of the LED lamp is further improved.
Preferably, the conversion circuit includes a first switch, an optical coupler, a first voltage-dividing resistor and a second voltage-dividing resistor, a connection point of the first voltage-dividing resistor and the second voltage-dividing resistor is connected to a control electrode of the first switch, one end of the first voltage-dividing resistor is used for receiving a second analog signal, one end of the second voltage-dividing resistor is grounded, an anode and a cathode of the optical coupler and an input end of the first switch are connected in series in the same power-on loop, and a collector and an emitter of the optical coupler are connected to the trimming circuit and used for outputting a sampling signal.
Through adopting above-mentioned technical scheme, realize the isolation of strong electric side and weak electric side through the opto-coupler, and because first divider resistor forms the divider circuit with the second divider resistor, and the potential of rectifier circuit output end is got to first divider resistor, and second analog signal promptly, and first switch spare switches on and makes the opto-coupler luminous switch on and output sampling signal in the positive half-cycle of input waveform to this detects the input waveform behind the silicon controlled rectifier dimmer and makes the feedback.
Preferably, the first switch part comprises a reference voltage stabilizer, a control electrode of the reference voltage stabilizer is connected with a connection point of the first voltage-dividing resistor and the second voltage-dividing resistor, an input end and an output end of the reference voltage stabilizer are respectively connected with a cathode of the optical coupler, and an anode of the optical coupler is connected with a VCC end.
By adopting the technical scheme, when the voltage of the connection point of the first voltage division resistor and the second voltage division resistor is higher than the reference voltage of the reference voltage stabilizer, the optical coupler emits light, conducts and outputs the sampling signal, so that the waveform detection precision is improved.
Preferably, the conversion circuit further comprises a second switch, a control end of the second switch is respectively connected with a collector of the VCC terminal and the optocoupler, an emitter of the optocoupler is grounded, an output end of the second switch is grounded, an input end of the second switch is connected with the VCC terminal, and an input end of the second switch is used for outputting a sampling signal.
By adopting the technical scheme, if the sampling signal is a low-level signal, the low-level signal corresponding to the positive half cycle of the input waveform is mixed with the low-level signal generated by the power loss phenomenon due to the phenomena of circuit failure, power loss and the like, and error reporting is easy to occur; when the optical coupler is on by emitting light, the emitter of the optical coupler is grounded, and the sampling signal is converted into a high-level signal through the second switch piece, so that the confusion error reporting phenomenon is reduced.
Preferably, the trimming circuit comprises a single chip microcomputer and a control circuit, an input pin of the single chip microcomputer is used for receiving the sampling signal, an output pin of the single chip microcomputer is used for outputting the PWM signal, and the control circuit receives the PWM signal to control the output circuit.
By adopting the technical scheme, the sampling signal is read and processed through the single chip microcomputer, and the detected sampling signal is converted into the PWM signal corresponding to the LED brightness to be adjusted by the silicon controlled dimmer, so that the LED load is controlled to reach the ideal brightness close to the brightness adjusted by the silicon controlled dimmer, and the influence of interference signals such as peaks and the like generated after the silicon controlled dimmer is directly connected to the LED load brightness is reduced.
Preferably, the control circuit comprises a third switch element and a ground resistor, wherein the output end of the third switch element is grounded through the ground resistor, the input end of the third switch element is connected with the cathode of the LED load, and the control end of the third switch element is connected with the output pin of the single chip microcomputer and used for receiving the PWM signal.
By adopting the technical scheme, the higher the duty ratio of the PWM signal is, the higher the brightness of the LED load is, and the third switching element adjusts the flicker frequency of the LED according to the PWM signal, so that the brightness of the LED is adjusted, and the brightness adjustable effect is achieved.
Preferably, the control circuit further comprises an NPN triode and a PNP triode, wherein a collector of the NPN triode is connected to the VCC terminal, an emitter of the NPN triode is connected to a collector of the PNP triode, a connection point of the emitter and the PNP triode is connected to the control terminal of the third switching element, an emitter of the PNP triode is grounded, and bases of the NPN triode and the PNP triode are both connected to an output pin of the single chip microcomputer and are used for receiving the PWM signal.
By adopting the technical scheme, the switching characteristics of the NPN triode and the PNP triode are opposite, when the base electrodes of the NPN triode and the PNP triode input PWM signals simultaneously, one of the NPN triode and the PNP triode is turned on, and the other one of the NPN triode and the PNP triode is turned off, so that the on-off state of the third switching element is accurately adjusted, and the precision of PWM dimming is improved.
Preferably, the rectifier circuit comprises a rectifier bridge, and the conversion circuit further comprises a zener diode, wherein two ends of the zener diode are respectively connected to the positive output end and the negative output end of the rectifier bridge.
By adopting the technical scheme, the voltage stabilizing diode is used for reducing interference signals such as peaks generated in the input waveform after the silicon controlled rectifier dimmer is adjusted, filtering interference and improving the input waveform detection precision.
Preferably, the output circuit includes a power factor correction module, and the power factor correction module is used for connecting a mains supply and the LED load.
By adopting the technical scheme, the power factor refers to the relation between the effective power and the total power consumption, the input power can be improved by the power factor correction, the electric energy loss is reduced, and the overall performance of the circuit is improved.
In order to reduce the interference phenomenon of the thyristor dimmer to the LED load and improve the stability of the LED dimming, the present application provides a control method, which adopts the following technical scheme:
a control method for applying the dimming high-compatibility LED driving power supply comprises the following steps,
initializing a GPIOADCTIM peripheral;
starting all interrupts;
detecting whether a set time is reached;
if the set time is reached, reading the AD value;
acquiring the acquisition times, and detecting whether the set times are reached;
if the set times are reached, taking the average value of the AD values;
detecting whether the voltage is less than a set voltage;
if the voltage value is less than the set voltage, storing the voltage value, and executing Kalman filtering processing after the equal voltage of the set times is obtained;
if the voltage is larger than or equal to the set voltage, Kalman filtering processing is executed;
and acquiring a preset PWM signal, updating the PWM signal according to a Kalman filtering processing result, and outputting a new PWM signal.
Through adopting above-mentioned technical scheme, through the tangent phase waveform of silicon controlled rectifier dimmer input carry out rectification RC filtering after through resistance partial pressure again, later carry out RC filtering again, carry out AD value sampling with signal input to the singlechip to carry out PWM output according to silicon controlled rectifier dimmer's tangential angle, and PWM signal is used for adjusting luminance of LED load, with this reduce the interference phenomenon of silicon controlled rectifier dimmer to the LED load, promote the stability that LED adjusted luminance.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the second analog signal is subjected to analog-to-digital conversion through the conversion circuit, so that signal processing is facilitated; the trimming circuit performs PWM dimming on the LED load according to the sampling signal, namely a signal which represents the input waveform adjusted by the silicon controlled rectifier dimmer, and adjusts the switching frequency of the LED load, so that the interference of the silicon controlled rectifier dimmer on the input waveform is reduced while the brightness of the LED lamp is adjusted, and the running stability of the LED lamp is further improved;
2. the first switch part is conducted in the positive half cycle of the input waveform, so that the optical coupler emits light and conducts and outputs a sampling signal, and the input waveform passing through the silicon controlled rectifier dimmer is detected and fed back;
3. when the optical coupler is on in a light-emitting mode, the emitting electrode of the optical coupler is grounded, and the sampling signal is converted into a high-level signal through the second switch piece, so that the confusion error reporting phenomenon is reduced.
Drawings
Fig. 1 is a schematic block diagram of a dimming high-compatibility LED driving power supply according to an embodiment of the present application.
Fig. 2 is a schematic circuit diagram of a dimming highly compatible LED driving power supply according to an embodiment of the present application, which mainly shows a rectifying circuit.
Fig. 3 is a schematic circuit diagram of a dimming high-compatibility LED driving power supply according to an embodiment of the present application, which mainly shows a conversion circuit.
Fig. 4 is a schematic circuit diagram of a dimming high-compatibility LED driving power supply according to an embodiment of the present application, which mainly shows a single chip microcomputer.
Fig. 5 is a schematic circuit diagram of a dimming high-compatibility LED driving power supply according to an embodiment of the present application, which mainly shows a control circuit.
Fig. 6 is a schematic circuit diagram of a dimming high-compatibility LED driving power supply according to an embodiment of the present application, mainly showing a filtering portion of an output circuit.
Fig. 7 is a schematic circuit diagram of a dimming high-compatibility LED driving power supply according to an embodiment of the present application, which mainly shows a power factor correction module.
Fig. 8 is a schematic circuit diagram of a dimming high-compatibility LED driving power supply according to an embodiment of the present application, which mainly shows a synchronous rectification module.
Fig. 9 is a method flowchart of a control method according to an embodiment of the present application.
Description of reference numerals: 1. an input circuit; 2. a rectifying circuit; 3. a conversion circuit; 4. an output circuit; 41. a power factor correction module; 42. a synchronous rectification module; 5. a trimming circuit; 51. a control circuit; 52. and a single chip microcomputer.
Detailed Description
The present application is described in further detail below with reference to the accompanying drawings.
The embodiment of the application discloses a high compatible LED drive power supply adjusts luminance. Referring to fig. 1 and 2, the dimming high-compatibility LED driving power supply includes an input circuit 1, a rectifying circuit 2, a converting circuit 3, an output circuit 4, and a trimming circuit 5, where the input circuit 1 is connected to a mains supply through a silicon controlled dimmer, the mains supply inputs a sine wave signal, and the silicon controlled dimmer outputs a phase-cut chopping signal, i.e., a first analog signal, where the phase cut may be a leading edge phase cut or a trailing edge phase cut. Rectifier circuit 2 is used for carrying out rectification processing to the chopper signal, generates second analog signal, and conversion circuit 3 is used for gathering second analog signal to analog-to-digital conversion generates corresponding sampling signal, and trimming circuit 5 controls output circuit 4 of connecting the commercial power according to sampling signal, carries out PWM to the LED load of being connected with output circuit 4 and adjusts luminance, thereby reduces the interference of silicon controlled rectifier dimmer to output circuit 4, promotes the stability of LED drive.
Rectifier circuit 2 includes the rectifier bridge, and its input is connected with the output of silicon controlled rectifier dimmer, and the rectifier bridge adopts the full-bridge rectification mode in this embodiment for carry out the rectification to the chopper signal of silicon controlled rectifier dimmer output, remain the positive half cycle part of chopper signal, and convert the partial equivalence of negative half cycle into positive half cycle part, so that the converting circuit detects input waveform.
The conversion circuit 3 includes a first resistor R168 and a second resistor R170, the first resistor R168 is connected in series with the second resistor R170, one end of the first resistor R168 and one end of the second resistor R170 are respectively connected to the positive output end and the negative output end of the rectifier bridge, a filter capacitor C131 is connected in parallel to the second resistor R170, and the filter capacitor C131 is used for reducing interference signals such as spikes and the like, and improving the stability of the second analog signal.
Referring to fig. 1 and 3, the conversion circuit 3 further includes a first switching device U13, a second switching device Q12, an optical coupler UB2, a first voltage-dividing resistor RQ3, and a second voltage-dividing resistor RQ2, where the first switching device U13 is a reference voltage regulator, and the second switching device Q12 is an NMOS transistor. The connection point of the first voltage-dividing resistor RQ3 and the second voltage-dividing resistor RQ2 is connected to the control electrode of the first switch device U13, and one end of the first voltage-dividing resistor RQ3 is connected to the positive output end of the rectifier bridge, and is configured to receive the second analog signal.
One end of the second voltage-dividing resistor RQ2 is grounded, the anode of the optocoupler UB2 is connected to the VCC terminal, the cathode thereof is connected to the output terminal of the first switching element U13, and the input terminal of the first switching element U13 is grounded. The emitter of the optocoupler UB2 is grounded, the collector thereof is connected to the gate of the second switching element Q12 and the VCC terminal, respectively, the source of the second switching element Q12 is grounded, and the drain thereof is connected to the VCC terminal and the trimming circuit 5, respectively, for inputting the sampling signal to the trimming circuit 5.
Referring to fig. 1 and 4, the trimming circuit 5 includes a single chip 52 and a control circuit 51, an input pin AD19 of the single chip 52 is used for receiving a sampling signal, and an output pin of the single chip 52 is used for outputting a control signal. And the output pin of the single chip 52 is connected with a fourth switching element Q16, the fourth switching element Q16 adopts an NMOS transistor, the gate of the fourth switching element Q16 is used for receiving a control signal, the source thereof is grounded, the drain thereof is used for outputting a PWM signal, and the control circuit 51 is used for receiving the PWM signal to control the output circuit 4.
Referring to fig. 1 and 5, the control circuit 51 includes an NPN transistor Q6, a PNP transistor Q5, a third switching element Q6A, and a ground resistor R86, the third switching element Q6A is an NMOS transistor, an output end, i.e., a source, of the third switching element Q6A is grounded through the ground resistor R86, an input end, i.e., a drain, of the third switching element Q6 is connected to a cathode of the LED load, a control end, i.e., a gate, of the third switching element Q6 is connected to an emitter of the NPN transistor Q6 and a collector of the PNP transistor Q5, a collector of the NPN transistor Q6 is connected to a VCC end, an emitter of the PNP transistor Q5 is grounded, and bases of the NPN transistor Q6 and the PNP transistor Q5 are both connected to an output pin of the single chip microcomputer 52 for receiving a PWM signal.
Referring to fig. 1, 6 and 7, the output circuit 4 includes a power factor correction module 41 and a synchronous rectification circuit 2, and the power factor correction module 41 may adopt an ICL5102 PFC and HB combined controller for connecting to a mains supply to perform power factor correction on an input sine wave signal, thereby improving the power factor of the output circuit 4, reducing the influence of phase offset on the power factor by matching with an inductive load, and reducing the power loss. Fig. 6 shows a filter processing section, and fig. 7 shows a PFC section.
Referring to fig. 1 and 8, the synchronous rectification circuit 2 includes a controller of MPS6924 type, the MPS6924 controller is a two-way fast turn-off intelligent rectifier for synchronous rectification of the LLC resonant converter, the output voltage to the LED load is controlled by the NMOS QA1 and the NMOS QA2, the NMOS QA1 is interlocked with the NMOS QA2 in switching state, one of them is turned on while the other is turned off, and the gate voltages of both are synchronized with the phase of the output voltage, so that the loss of the whole circuit is reduced and the stability of the current is improved by this synchronization.
Referring to fig. 4 and 9, the present embodiment further discloses a control method, which applies the dimming highly compatible LED driving power supply, including the following steps,
step S100: initializing a GPIOADCTIM peripheral; starting all interrupts; whether the set time is reached is detected.
Specifically, the set time can be 200us, and 200us is determined to obtain the ADC parameter value, so that the ADC reading time interval is 200us, the error value when the single chip 52 reads the AD value is reduced, and the stability is increased.
Step S200: and if the set time is reached, reading the AD value.
Specifically, the phase-cut waveform input by the thyristor dimmer is filtered, divided, filtered, and input into the single chip microcomputer 52 as a sampling signal, and the sampling of the AD value is performed, so that the tangential angle of the thyristor dimmer is obtained and used for adjusting the final PWM output.
Step S300: acquiring the acquisition times, and detecting whether the set times are reached;
if the set times are reached, taking the average value of the AD values;
specifically, the set number of times can be 100, because the AD value sampling is performed every 200us, the sampling time of 100 times is 20 milliseconds, which is just one period of 50Hz of the mains supply, each sampling is ensured to be one period, the sampling precision is improved, and the sampling linearity is increased by taking an average value.
Step S400: detecting whether the voltage is less than a set voltage;
if the voltage value is less than the set voltage, storing the voltage value, and executing Kalman filtering processing after the equal voltage of the set times is obtained;
if the voltage is larger than or equal to the set voltage, Kalman filtering processing is executed.
Specifically, the set voltage can adopt 0.2V, and the dimmer phase-cutting degree is little when sampling voltage is less than 0.2V, produces interfering signal very easily, for eliminating interfering signal, increases the stability of adjusting luminance, through experimental testing, carries out signal output when six times equals voltage in succession and can reach the best effect, therefore sets for the number of times and gets 6 times. The Kalman filtering is an algorithm for performing optimal estimation on the system state by using a linear system state equation and inputting and outputting observation data through a system, and is similar to a signal processing method of filtering, so that signal interference can be reduced, and the control precision is improved.
Step S500: and acquiring a preset PWM signal, updating the PWM signal according to a Kalman filtering processing result, and outputting a new PWM signal.
Specifically, new PWM signal is control signal, and the signal that obtains according to the quantization relation that LED luminance standard of transferring luminance corresponds with silicon controlled rectifier's regulation gradient is referred to predetermined PWM signal, can reduce signal interference behind the update PWM signal, can accurate reflection silicon controlled rectifier's regulation gradient to through the accurate control LED load of the PWM signal after the update, promote and control the precision.
The implementation principle of the dimming high-compatibility LED driving power supply provided by the embodiment of the application is as follows: the sine wave signal of the mains supply is converted into a first analog signal after passing through the silicon controlled rectifier dimmer, the first analog signal is converted into a second analog signal after being rectified by the rectifier bridge, and then the interference signals such as peaks and the like are filtered by the filter capacitor C131. The reference voltage stabilizer U13 receives the second analog signal and switches on when the voltage value of the second analog signal reaches the reference voltage, so that the cathode of the optocoupler UB2 is grounded and is switched on by light emission, and the optocoupler UB2 plays a role in strong current isolation at the same time.
When the collector of the optocoupler UB2 is conducted with the emitter, the grid of the second switch element Q12 is grounded, according to the characteristics of the NMOS tube, at the moment, the second switch element Q12 is cut off, the input pin AD19 of the single chip microcomputer is connected with a high level signal, namely a sampling signal, after signal processing, the output pin of the single chip microcomputer outputs a control signal, the control signal controls the fourth switch element Q16 to be conducted, the PWM signal is output and used for controlling the NPN triode Q6 and the PNP triode Q5 to be conducted or cut off, the third switch element Q6A is controlled to be conducted or cut off, the LED load is further controlled to be conducted or cut off, PWM dimming is achieved, and the brightness of the LED load is conveniently adjusted.
This application is through gathering earlier the chopper signal behind the silicon controlled rectifier dimmer, carries out rectification, the back to chopper signal again, and the reuse is used for the signal source as PWM adjusts luminance to reduce the direct signal interference who adjusts luminance and cause of silicon controlled rectifier dimmer, according to the phase place and the pulse width control LED load of the input waveform who gathers, promote the precision of adjusting luminance, compatible leading edge phase cut mode of adjusting luminance and trailing edge phase cut mode of adjusting luminance simultaneously promote compatibility.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. The utility model provides a high compatible LED drive power supply of adjusting luminance which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the input circuit (1) is connected with the output end of the silicon controlled rectifier dimmer and is used for inputting a first analog signal, and the input end of the silicon controlled rectifier dimmer is connected with mains supply;
the rectifying circuit (2) is connected with the input circuit (1) and is used for receiving the first analog signal, rectifying the first analog signal and outputting a second analog signal;
the conversion circuit (3) is connected with the rectification circuit (2) and is used for receiving the second analog signal, executing analog-to-digital conversion processing and outputting a sampling signal;
the output circuit (4) is connected with the mains supply and used for supplying power to the LED lamp; and
and the trimming circuit (5) is connected with the conversion circuit (3) and the output circuit (4) and is used for receiving the sampling signal and controlling the power supply of the output circuit (4) according to the sampling signal.
2. The dimming high-compatibility LED driving power supply according to claim 1, wherein: the conversion circuit (3) comprises a first switch piece, an optical coupler, a first voltage division resistor and a second voltage division resistor, wherein the connecting point of the first voltage division resistor and the second voltage division resistor is connected with the control electrode of the first switch piece, one end of the first voltage division resistor is used for receiving a second analog signal, one end of the second voltage division resistor is grounded, the anode and the cathode of the optical coupler and the input end of the first switch piece are connected in series in the same electrifying loop, and the collector electrode and the emitter electrode of the optical coupler are connected to a trimming circuit (5) and used for outputting a sampling signal.
3. The dimming high-compatibility LED driving power supply according to claim 1, wherein: the first switch part comprises a reference voltage stabilizer, a control electrode of the reference voltage stabilizer is connected with a connection point of the first voltage-dividing resistor and the second voltage-dividing resistor, an input end and an output end of the first switch part are respectively connected with a cathode of the optical coupler, and an anode of the optical coupler is connected with a VCC end.
4. The dimming high-compatibility LED driving power supply according to claim 1, wherein: conversion circuit (3) still include second switch spare, and VCC end and opto-coupler's collecting electrode is connected respectively to the control end of second switch spare, the projecting pole ground connection of opto-coupler, the VCC end is connected to the output ground connection of second switch spare and its input, and the input of second switch spare is used for exporting sampling signal.
5. The dimming high-compatibility LED driving power supply according to claim 1, wherein: the trimming circuit (5) comprises a single chip microcomputer (52) and a control circuit (51), an input pin of the single chip microcomputer (52) is used for receiving a sampling signal, an output pin of the single chip microcomputer (52) is used for outputting a PWM signal, and the control circuit (51) receives the PWM signal to control the output circuit (4).
6. The dimming high-compatibility LED driving power supply according to claim 1, wherein: the control circuit (51) comprises a third switch element and a grounding resistor, wherein the output end of the third switch element is grounded through the grounding resistor, the input end of the third switch element is connected with the cathode of the LED load, and the control end of the third switch element is connected with the output pin of the single chip microcomputer (52) and used for receiving the PWM signal.
7. The dimming high-compatibility LED driving power supply according to claim 1, wherein: the control circuit (51) further comprises an NPN triode and a PNP triode, wherein a collector of the NPN triode is connected with the VCC end, an emitter of the NPN triode is connected with a collector of the PNP triode, a connecting point of the collector and the PNP triode is connected with the control end of the third switching element, an emitter of the PNP triode is grounded, and bases of the NPN triode and the PNP triode are connected with an output pin of the single chip microcomputer (52) and used for receiving the PWM signal.
8. The dimming high-compatibility LED driving power supply according to claim 1, wherein: the rectifying circuit (2) comprises a rectifying bridge, the conversion circuit (3) further comprises a filter capacitor, and two ends of the filter capacitor are respectively connected with the positive output end and the negative output end of the rectifying bridge.
9. The dimming high-compatibility LED driving power supply according to claim 1, wherein: the output circuit (4) comprises a power factor correction module, and the power factor correction module is used for connecting a mains supply and an LED load.
10. A control method implemented by applying the dimming high-compatibility LED driving power supply of any one of claims 1-9, comprising the following steps,
initializing a GPIOADCTIM peripheral;
starting all interrupts;
detecting whether a set time is reached;
if the set time is reached, reading the AD value;
acquiring the acquisition times, and detecting whether the set times are reached;
if the set times are reached, taking the average value of the AD values;
detecting whether the voltage is less than a set voltage;
if the voltage value is less than the set voltage, storing the voltage value, and executing Kalman filtering processing after the equal voltage of the set times is obtained;
if the voltage is larger than or equal to the set voltage, Kalman filtering processing is executed;
and acquiring a preset PWM signal, updating the PWM signal according to a Kalman filtering processing result, and outputting a new PWM signal.
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