CN103716952B - A kind of LED switch power supply and control method thereof - Google Patents
A kind of LED switch power supply and control method thereof Download PDFInfo
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Abstract
The invention discloses a kind of LED switch power supply and control method thereof.This power supply comprises controllable silicon dimmer, rectifier bridge, PFC circuit of power factor correction, flyback voltage converting circuit and output interface, the first input end of rectifier bridge is connected with one end of controllable silicon dimmer, the other end of controllable silicon dimmer is connected with AC power one end, second input of rectifier bridge is connected with the other end of AC power, the earth terminal ground connection of rectifier bridge, the output of rectifier bridge, PFC circuit of power factor correction, flyback voltage converting circuit are connected successively with output interface.The method detects the angle of flow of controllable silicon dimmer by flyback control chip, thus the duty ratio of adjustment output interface output voltage, realize the object of light modulation.The present invention can export the voltage of duty ratio corresponding according to the different angles of flow of controllable silicon dimmer, thus just can realize dimming function without the need to late-class circuit process, and light modulation precision is high, reduces system cost.
Description
Technical field
The present invention relates to power technique fields, particularly relate to a kind of LED switch power supply and control method thereof.
Background technology
As shown in Figure 4, output is a constant voltage or current source to current Switching Power Supply, and a switch series connection in the load, need the duty ratio of late-class circuit control switch, realize the change of load average electric current, thus realize light modulation, switch and the late-class circuit of increase add system cost.
China Patent Publication No. 2781641, publication date on May 17th, 2006, the name of utility model is called Switching Power Supply, this application case discloses a kind of Switching Power Supply, it comprises power supply switch tube, pulse width modulation circuit, energy storage filter capacitor and transformer, wherein the output of pulse width modulation circuit is connected with the control end of power supply switch tube, the voltage output end of described transformer is connected with the input of pulse width modulation circuit, described energy storage filter capacitor is connected with the second end of transformer, also comprise power factor correction unit, the input of described correcting unit is connected with rectification input, one of them output is connected with the second end of transformer and energy storage filter capacitor respectively, another output is connected with the source electrode of power supply switch tube and the first end of transformer respectively.Its weak point is, what this Switching Power Supply exported is a constant voltage, needs late-class circuit process could realize LED dimming function, adds system cost.
Summary of the invention
The object of the invention is to overcome current Switching Power Supply will realize light modulation and need to increase late-class circuit and control, add the technical problem of cost, provide a kind of LED switch power supply and control method thereof, it can export the voltage of duty ratio corresponding according to the different angles of flow of controllable silicon dimmer, thus just can realize dimming function without the need to late-class circuit process, light modulation precision is high, reduces system cost.
In order to solve the problem, the present invention is achieved by the following technical solutions:
A kind of LED switch power supply of the present invention, comprise controllable silicon dimmer, rectifier bridge, PFC circuit of power factor correction, flyback voltage converting circuit and output interface, the first input end of described rectifier bridge is electrically connected with one end of controllable silicon dimmer, the other end of described controllable silicon dimmer is electrically connected with AC power one end, second input of described rectifier bridge is electrically connected with the other end of AC power, the earth terminal ground connection of described rectifier bridge, the output of described rectifier bridge is electrically connected with the input of PFC circuit of power factor correction, the output of described PFC circuit of power factor correction is electrically connected with flyback voltage converting circuit input, described flyback voltage converting circuit output is electrically connected with output interface.
In the technical program, during use, the positive pole of LED load is electrically connected with output interface, the minus earth of LED load.The angle of flow of controllable silicon dimmer is regulated by rotating controllable silicon dimmer upper knob.AC power is 220V civil power, an alternating current be notched is obtained through controllable silicon dimmer from the alternating current of civil power input, this alternating current is input to PFC circuit of power factor correction after rectifier bridge rectification, PFC circuit of power factor correction makes output current and input voltage same-phase and for sinusoidal wave, namely power factor is improved, PFC circuit of power factor correction can make whole circuit show as resistance characteristic simultaneously, thus can realize the light modulation of flicker free.The direct current that rectifier bridge exports is input to flyback voltage converting circuit after the process of PFC circuit of power factor correction, input voltage is converted to LED load required voltage and exports from output interface by flyback voltage converting circuit, simultaneously, flyback voltage converting circuit detects the voltage that rectifier bridge exports, calculate the angle of flow of controllable silicon dimmer, and the duty ratio of output interface output voltage is adjusted according to the angle of flow, cause the average current of LED load to change, realize the object of light modulation.
As preferably, described PFC circuit of power factor correction comprises PFC control chip, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R9, electric capacity C1, diode D1, inductance L 1 and N-channel MOS pipe Q1, the output of described rectifier bridge and inductance L 1 one end, resistance R1 one end and the electrical connection of resistance R9 one end, inductance L 1 other end is electrically connected with the anode of diode D1 and the drain electrode of N-channel MOS pipe Q1, the negative electrode of diode D1 and resistance R4 one end, the voltage input end electrical connection of electric capacity C1 one end and flyback voltage converting circuit, electric capacity C1 other end ground connection, the resistance R4 other end is electrically connected with the inverse detection end INV of resistance R5 one end and PFC control chip, resistance R5 other end ground connection, the resistance R9 other end is electrically connected with the power end VCC of PFC control chip and the power input of flyback voltage converting circuit, the resistance R1 other end and resistance R2 one end, the multiplier input MULT of PFC control chip and the input voltage measurement end electrical connection of flyback voltage converting circuit, resistance R2 other end ground connection, the drive end GD of PFC control chip is electrically connected with the grid of N-channel MOS pipe Q1, the current sample end CS of PFC control chip is electrically connected with the source electrode of N-channel MOS pipe Q1 and resistance R3 one end, resistance R3 other end ground connection, the earth terminal GND ground connection of PFC control chip.PFC control chip can adopt L6561 chip or L6562 chip.The work of PFC circuit of power factor correction is controlled by PFC control chip, makes output current and input voltage same-phase and for sinusoidal wave, namely improves power factor.
As preferably, described flyback voltage converting circuit comprises flyback control chip, resistance R6, resistance R7, resistance R8, electric capacity C2, electric capacity C3, diode D2, diode D3, N-channel MOS pipe Q2 and transformer T, the power end VCC of flyback control chip is connected with the cathodic electricity of electric capacity C2 one end and diode D2, electric capacity C2 other end ground connection, the anode of diode D2 is the power input of flyback voltage converting circuit, the drive end OUT of flyback control chip is electrically connected with the grid of N-channel MOS pipe Q2, the drain electrode of N-channel MOS pipe Q2 is electrically connected with the former limit winding different name end of transformer T, the former limit Motor Winding Same Name of Ends of transformer T is the voltage input end of flyback voltage converting circuit, the source electrode of N-channel MOS pipe Q2 is electrically connected with the current sample end CS of resistance R8 one end and flyback control chip, resistance R8 other end ground connection, the winding voltage test side FB of flyback control chip is electrically connected with resistance R6 one end and resistance R7 one end, resistance R7 other end ground connection, the resistance R6 other end is electrically connected with the first vice-side winding different name end of transformer T, the first vice-side winding Same Name of Ends ground connection of transformer T, the input voltage measurement end VS of flyback control chip is the input voltage measurement end of flyback voltage converting circuit, the earth terminal GND ground connection of flyback control chip, the second vice-side winding different name end of transformer T is electrically connected with the anode of diode D3, the negative electrode of diode D3 is electrically connected with electric capacity C3 one end and output interface, second vice-side winding Same Name of Ends and the ground wire of the electric capacity C3 other end and transformer T are electrically connected.Flyback control chip can adopt IW3620 chip or IW3612 chip.The voltage transitions of input is that LED load required voltage exports from output interface by transformer T, flyback control chip detects the voltage of rectifier bridge output by input voltage measurement end VS, and calculate the angle of flow of controllable silicon dimmer, flyback control chip is according to the output of angle of flow adjustment drive end OUT, the break-make of N-channel MOS pipe Q2 is controlled by drive end OUT, thus the duty ratio of adjustment output interface output voltage, cause the average current of LED load to change, realize the object of light modulation.The former limit of transformer T and secondary electrical isolation, make export not with electrical network altogether.
A kind of LED switch power control method of the present invention, comprises the following steps:
S1: the alternating current that AC power exports obtains an alternating current be notched after controllable silicon dimmer, and this alternating current is input to PFC circuit of power factor correction after rectifier bridge rectification;
S2:PFC circuit of power factor correction makes output current and input voltage same-phase and for sinusoidal wave, namely improves power factor, and the direct current that rectifier bridge exports is input to flyback voltage converting circuit after the process of PFC circuit of power factor correction;
S3: flyback control chip detects the voltage of rectifier bridge output by input voltage measurement end VS, and calculate the angle of flow of controllable silicon dimmer, flyback control chip is according to the output of angle of flow adjustment drive end OUT, the break-make of N-channel MOS pipe Q2 is controlled by drive end OUT, thus the duty ratio of adjustment output interface output voltage, cause the average current of LED load to change, realize the object of light modulation.
As preferably, described N-channel MOS pipe Q2 has 2 work periods under the control of the drive end OUT of flyback control chip, be respectively HF switch cycle T 1 and low frequency switch cycle T 2, low frequency switch cycle T 2 comprise PWM time period D1 and down time section D2, the duty ratio of low frequency switch cycle T 2 is D1/ (D1+D2), the namely duty ratio of output interface output voltage, flyback control chip is according to the controllable silicon dimmer angle of flow adjustment T2 duty ratio calculated, in time period D1, N-channel MOS pipe Q2 works according to HF switch cycle T 1, the voltage of output interface stable output, in time period D2, N-channel MOS pipe Q2 disconnects, output interface is output voltage not.
When the controllable silicon dimmer angle of flow 180 degree, input voltage is close to sinusoidal wave, the input voltage measurement end VS of flyback control chip detects that supply voltage does not have corner cut, then the drive end OUT of flyback control chip exports without interrupting pwm signal, N-channel MOS pipe Q2 works according to HF switch cycle T 1, and output interface exports a direct voltage.When the controllable silicon dimmer angle of flow changes, the input voltage measurement end VS of flyback control chip detects that voltage is notched, and corner cut size can obtain in computing, then this corner cut size of flyback control chip internal condition, adjustment drive end OUT exports, on the basis of HF switch cycle T 1, introduce another low-frequency cycle T2.We can specify in the T2 cycle, and have the time period of PWM to be D1, switch idle time period is D2, then D1/ (D1+D2) be T2 duty ratio, the namely duty ratio of output interface output voltage.During D2, the power supply of flyback control chip is provided by PFC circuit of power factor correction, and such flyback control chip can not because of power down during D2.
As preferably, described HF switch cycle T 1 is 20KHZ ~ 200KHZ, and low frequency switch cycle T 2 is 100HZ ~ 1KHZ.
Substantial effect of the present invention is: (1) can export the voltage of duty ratio corresponding according to the different angles of flow of controllable silicon dimmer, thus just can realize dimming function without the need to late-class circuit process, and light modulation precision is high, reduces system cost.(2) on the basis of PWM switch periods T1, introduce another low-frequency cycle T2, have adjusted output size, achieve flicker free light modulation, can parallel multiplex LED load work simultaneously simultaneously.
Accompanying drawing explanation
Fig. 1 is that a kind of circuit theory of the present invention connects block diagram;
Fig. 2 is a kind of circuit theory diagrams of the present invention;
Fig. 3 is the input voltage waveform figure of N-channel MOS pipe Q2 grid of the present invention;
Fig. 4 is the structural representation of existing Switching Power Supply.
In figure: 1, controllable silicon dimmer, 2, rectifier bridge, 3, PFC circuit of power factor correction, 4, flyback voltage converting circuit, 5, output interface, 6, AC power, 7, PFC control chip, 8, flyback control chip, 9, LED load.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment: a kind of LED switch power supply of the present invention, as shown in Figure 1, comprise controllable silicon dimmer 1, rectifier bridge 2, PFC circuit of power factor correction 3, flyback voltage converting circuit 4 and output interface 5, the first input end of rectifier bridge 2 is electrically connected with one end of controllable silicon dimmer 1, the other end of controllable silicon dimmer 1 is electrically connected with AC power 6 one end, second input of rectifier bridge 2 is electrically connected with the other end of AC power 6, the earth terminal ground connection of rectifier bridge 2, the output of rectifier bridge 2 is electrically connected with the input of PFC circuit of power factor correction 3, the output of PFC circuit of power factor correction 3 is electrically connected with flyback voltage converting circuit 4 input, flyback voltage converting circuit 4 output is electrically connected with output interface 5.
As shown in Figure 2, PFC circuit of power factor correction 3 comprises PFC control chip 7, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R9, electric capacity C1, diode D1, inductance L 1 and N-channel MOS pipe Q1, flyback voltage converting circuit 4 comprises flyback control chip 8, resistance R6, resistance R7, resistance R8, electric capacity C2, electric capacity C3, diode D2, diode D3, N-channel MOS pipe Q2 and transformer T, the output of rectifier bridge 2 and inductance L 1 one end, resistance R1 one end and the electrical connection of resistance R9 one end, inductance L 1 other end is electrically connected with the anode of diode D1 and the drain electrode of N-channel MOS pipe Q1, the negative electrode of diode D1 and resistance R4 one end, the former limit Motor Winding Same Name of Ends electrical connection of electric capacity C1 one end and transformer T, electric capacity C1 other end ground connection, the resistance R4 other end is electrically connected with the inverse detection end INV of resistance R5 one end and PFC control chip 7, resistance R5 other end ground connection, the resistance R9 other end is electrically connected with the power end VCC of PFC control chip 7 and the anode of diode D2, the resistance R1 other end and resistance R2 one end, the multiplier input MULT of PFC the control chip 7 and input voltage measurement end VS of flyback control chip 8 is electrically connected, resistance R2 other end ground connection, the drive end GD of PFC control chip 7 is electrically connected with the grid of N-channel MOS pipe Q1, the current sample end CS of PFC control chip is electrically connected with the source electrode of N-channel MOS pipe Q1 and resistance R3 one end, resistance R3 other end ground connection, the earth terminal GND ground connection of PFC control chip 7, the negative electrode of diode D2 is electrically connected with the power end VCC of electric capacity C2 one end and flyback control chip 8, electric capacity C2 other end ground connection, the drive end OUT of flyback control chip 8 is electrically connected with the grid of N-channel MOS pipe Q2, the drain electrode of N-channel MOS pipe Q2 is electrically connected with the former limit winding different name end of transformer T, the source electrode of N-channel MOS pipe Q2 is electrically connected with the current sample end CS of resistance R8 one end and flyback control chip 8, resistance R8 other end ground connection, the winding voltage test side FB of flyback control chip 8 is electrically connected with resistance R6 one end and resistance R7 one end, resistance R7 other end ground connection, the resistance R6 other end is electrically connected with the first vice-side winding different name end of transformer T, the first vice-side winding Same Name of Ends ground connection of transformer T, the earth terminal GND ground connection of flyback control chip 8, the second vice-side winding different name end of transformer T is electrically connected with the anode of diode D3, the negative electrode of diode D3 is electrically connected with electric capacity C3 one end and output interface 5, second vice-side winding Same Name of Ends and the ground wire of the electric capacity C3 other end and transformer T are electrically connected.
The positive pole of LED load 9 is electrically connected with output interface 5, and the negative pole of LED load is electrically connected with current-limiting resistance one end, current-limiting resistance other end ground connection.Rotate the angle of flow of the adjustable controllable silicon dimmer 1 of knob on controllable silicon dimmer 1.AC power 6 is 220V civil power, and obtain an alternating current be notched from the alternating current of civil power input through controllable silicon dimmer 1, this alternating current is input to PFC circuit of power factor correction 3 after rectifier bridge 2 rectification.The work of PFC circuit of power factor correction 3 is controlled by PFC control chip 7, PFC control chip 7 adopts L6561 chip, PFC control chip 7 detects the voltage of rectifier bridge 2 output by multiplier input MULT, output voltage is detected by inverse detection end INV, by current sample end CS sample rate current, controlled the break-make of N-channel MOS pipe Q1 by drive end GD.PFC circuit of power factor correction 3 makes output current and input voltage same-phase and for sinusoidal wave, namely improves power factor, and PFC circuit of power factor correction 3 can make whole circuit show as resistance characteristic simultaneously, thus can realize the light modulation of flicker free.
The direct current that rectifier bridge 2 exports is input to flyback voltage converting circuit 4 after PFC circuit of power factor correction 3 processes.Flyback voltage converting circuit 4 is controlled by flyback control chip 8, flyback control chip 8 adopts IW3620 chip, flyback control chip 8 detects the voltage of rectifier bridge 2 output by input voltage measurement end VS, by current sample end CS sample rate current, detected the voltage of transformer T first vice-side winding by winding voltage test side FB, controlled the break-make of N-channel MOS pipe Q2 by drive end OUT.The voltage transitions of input is that LED load 9 required voltage exports from output interface 5 by transformer T, flyback control chip 8 detects the voltage of rectifier bridge 2 output by input voltage measurement end VS, and calculate the angle of flow of controllable silicon dimmer 1, flyback control chip 8 is according to the output of angle of flow adjustment drive end OUT, the break-make of N-channel MOS pipe Q2 is controlled by drive end OUT, thus the duty ratio of adjustment output interface 5 output voltage, cause the average current of LED load 9 to change, realize the object of light modulation.The former limit of transformer T and secondary electrical isolation, make export not with electrical network altogether.
A kind of LED switch power control method of the present embodiment, is applicable to above-mentioned a kind of LED switch power supply, comprises the following steps:
S1: the alternating current that AC power 6 exports obtains an alternating current be notched after controllable silicon dimmer 1, and this alternating current is input to PFC circuit of power factor correction 3 after rectifier bridge 2 rectification;
S2:PFC circuit of power factor correction 3 makes output current and input voltage same-phase and for sinusoidal wave, namely improves power factor, and the direct current that rectifier bridge 2 exports is input to flyback voltage converting circuit 4 after PFC circuit of power factor correction 3 processes;
S3: flyback control chip 8 detects the voltage of rectifier bridge 2 output by input voltage measurement end VS, and calculate the angle of flow of controllable silicon dimmer 1, flyback control chip 8 is according to the output of angle of flow adjustment drive end OUT, the break-make of N-channel MOS pipe Q2 is controlled by drive end OUT, thus the duty ratio of adjustment output interface 5 output voltage, cause the average current of LED load 9 to change, realize the object of light modulation.
N-channel MOS pipe Q2 has 2 work periods under the control of the drive end OUT of flyback control chip 8, is respectively HF switch cycle T 1 and low frequency switch cycle T 2, as shown in Figure 3.Low frequency switch cycle T 2 comprise PWM time period D1 and down time section D2, the duty ratio of low frequency switch cycle T 2 is D1/ (D1+D2), the namely duty ratio of output interface 5 output voltage, flyback control chip 8 is according to controllable silicon dimmer 1 angle of flow adjustment T2 duty ratio calculated, in time period D1, N-channel MOS pipe Q2 works according to HF switch cycle T 1, the voltage of output interface 5 stable output, in time period D2, N-channel MOS pipe Q2 disconnects, output interface 5 not output voltage.Setting controllable silicon dimmer 1 angle of flow is θ, and the duty ratio of low frequency switch cycle T 2 is K, then K=θ/180 °.
HF switch cycle T 1 is 60KHZ, and low frequency switch cycle T 2 is 200HZ.When controllable silicon dimmer 1 angle of flow is 180 degree, input voltage is close to sinusoidal wave, the input voltage measurement end VS of flyback control chip 8 detects that supply voltage does not have corner cut, then the drive end OUT of flyback control chip 8 exports without interrupting pwm signal, N-channel MOS pipe Q2 works according to HF switch cycle T 1, and output interface 5 exports a direct voltage.When controllable silicon dimmer 1 angle of flow changes, the input voltage measurement end VS of flyback control chip 8 detects that voltage is notched, and computing obtains corner cut size, flyback control chip 8 exports according to this corner cut size adjustment drive end OUT, on the basis of HF switch cycle T 1, introduce another low-frequency cycle T2.Within the T2 cycle, the time period of PWM is had to be D1, switch idle time period is D2, then D1/ (D1+D2) duty ratio that is T2, by regulating the duty ratio of duty cycle adjustment output interface 5 output voltage of T2, cause the average current of LED load 9 to change, realize the object of flicker free light modulation, the degree of regulation of LED load 9 brightness is high.During D2, the power supply of flyback control chip 8 is provided by PFC circuit of power factor correction 3, and such flyback control chip 8 can not because of power down during D2.
Claims (2)
1. a LED switch power control method, be applicable to a kind of LED switch power supply, it is characterized in that, LED switch power supply comprises controllable silicon dimmer (1), rectifier bridge (2), PFC circuit of power factor correction (3), flyback voltage converting circuit (4) and output interface (5), the first input end of described rectifier bridge (2) is electrically connected with one end of controllable silicon dimmer (1), the other end of described controllable silicon dimmer (1) is electrically connected with AC power (6) one end, second input of described rectifier bridge (2) is electrically connected with the other end of AC power (6), the earth terminal ground connection of described rectifier bridge (2), the output of described rectifier bridge (2) is electrically connected with the input of PFC circuit of power factor correction (3), the output of described PFC circuit of power factor correction (3) is electrically connected with flyback voltage converting circuit (4) input, described flyback voltage converting circuit (4) output is electrically connected with output interface (5), described PFC circuit of power factor correction (3) comprises PFC control chip (7), resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R9, electric capacity C1, diode D1, inductance L 1 and N-channel MOS pipe Q1, the output of described rectifier bridge (2) and inductance L 1 one end, resistance R1 one end and the electrical connection of resistance R9 one end, inductance L 1 other end is electrically connected with the anode of diode D1 and the drain electrode of N-channel MOS pipe Q1, the negative electrode of diode D1 and resistance R4 one end, the voltage input end electrical connection of electric capacity C1 one end and flyback voltage converting circuit (4), electric capacity C1 other end ground connection, the resistance R4 other end is electrically connected with the inverse detection end INV of resistance R5 one end and PFC control chip (7), resistance R5 other end ground connection, the resistance R9 other end is electrically connected with the power end VCC of PFC control chip (7) and the power input of flyback voltage converting circuit (4), the resistance R1 other end and resistance R2 one end, the multiplier input MULT of PFC control chip (7) and the input voltage measurement end electrical connection of flyback voltage converting circuit (4), resistance R2 other end ground connection, the drive end GD of PFC control chip (7) is electrically connected with the grid of N-channel MOS pipe Q1, the current sample end CS of PFC control chip (7) is electrically connected with the source electrode of N-channel MOS pipe Q1 and resistance R3 one end, resistance R3 other end ground connection, the earth terminal GND ground connection of PFC control chip (7), described flyback voltage converting circuit (4) comprises flyback control chip (8), resistance R6, resistance R7, resistance R8, electric capacity C2, electric capacity C3, diode D2, diode D3, N-channel MOS pipe Q2 and transformer T, the power end VCC of flyback control chip (8) is connected with the cathodic electricity of electric capacity C2 one end and diode D2, electric capacity C2 other end ground connection, the anode of diode D2 is the power input of flyback voltage converting circuit (4), the drive end OUT of flyback control chip (8) is electrically connected with the grid of N-channel MOS pipe Q2, the drain electrode of N-channel MOS pipe Q2 is electrically connected with the former limit winding different name end of transformer T, the former limit Motor Winding Same Name of Ends of transformer T is the voltage input end of flyback voltage converting circuit (4), the source electrode of N-channel MOS pipe Q2 is electrically connected with the current sample end CS of resistance R8 one end and flyback control chip (8), resistance R8 other end ground connection, the winding voltage test side FB of flyback control chip (8) is electrically connected with resistance R6 one end and resistance R7 one end, resistance R7 other end ground connection, the resistance R6 other end is electrically connected with the first vice-side winding different name end of transformer T, the first vice-side winding Same Name of Ends ground connection of transformer T, the input voltage measurement end VS of flyback control chip (8) is the input voltage measurement end of flyback voltage converting circuit (4), the earth terminal GND ground connection of flyback control chip (8), the second vice-side winding different name end of transformer T is electrically connected with the anode of diode D3, the negative electrode of diode D3 is electrically connected with electric capacity C3 one end and output interface, second vice-side winding Same Name of Ends and the ground wire of the electric capacity C3 other end and transformer T are electrically connected, flyback control chip detects the voltage of rectifier bridge output by input voltage measurement end VS, and calculate the angle of flow of controllable silicon dimmer, flyback control chip is according to the output of angle of flow adjustment drive end OUT, the break-make of N-channel MOS pipe Q2 is controlled by drive end OUT, thus the duty ratio of adjustment output interface output voltage, the average current of LED load is caused to change,
LED switch power control method comprises the following steps:
S1: the alternating current that AC power exports obtains an alternating current be notched after controllable silicon dimmer, and this alternating current is input to PFC circuit of power factor correction after rectifier bridge rectification;
S2:PFC circuit of power factor correction makes output current and input voltage same-phase and for sinusoidal wave, namely improves power factor, and the direct current that rectifier bridge exports is input to flyback voltage converting circuit after the process of PFC circuit of power factor correction;
S3: flyback control chip detects the voltage of rectifier bridge output by input voltage measurement end VS, and calculate the angle of flow of controllable silicon dimmer, flyback control chip is according to the output of angle of flow adjustment drive end OUT, the break-make of N-channel MOS pipe Q2 is controlled by drive end OUT, thus the duty ratio of adjustment output interface output voltage, cause the average current of LED load to change, realize the object of light modulation;
Described N-channel MOS pipe Q2 has 2 work periods under the control of the drive end OUT of flyback control chip, be respectively HF switch cycle T 1 and low frequency switch cycle T 2, low frequency switch cycle T 2 comprise PWM time period D1 and down time section D2, the duty ratio of low frequency switch cycle T 2 is D1/ (D1+D2), the namely duty ratio of output interface output voltage, flyback control chip is according to the controllable silicon dimmer angle of flow adjustment T2 duty ratio calculated, in time period D1, N-channel MOS pipe Q2 works according to HF switch cycle T 1, the voltage of output interface stable output, in time period D2, N-channel MOS pipe Q2 disconnects, output interface is output voltage not, controllable silicon dimmer 1 angle of flow is θ, the duty ratio of low frequency switch cycle T 2 is K, then K=θ/180 °.
2. a kind of LED switch power control method according to claim 1, is characterized in that: described HF switch cycle T 1 is 20KHZ ~ 200KHZ, and low frequency switch cycle T 2 is 100HZ ~ 1KHZ.
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| CN110018413B (en) * | 2019-01-12 | 2024-06-11 | 广东人防工程质量检测有限公司 | Multifunctional electrical performance tester |
| CN110601566B (en) * | 2019-08-18 | 2022-05-17 | 南京博兰得电子科技有限公司 | Adapter power supply and control method thereof |
| CN112367748B (en) * | 2020-12-14 | 2022-11-22 | 深圳市华浩德电子有限公司 | Floating type buck-boost PFC circuit and LED driving power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101835314A (en) * | 2010-05-19 | 2010-09-15 | 成都芯源系统有限公司 | LED drive circuit with dimming function and lamp |
| CN101951177A (en) * | 2010-09-06 | 2011-01-19 | Bcd半导体制造有限公司 | Switch power supply system and switching power source control circuit |
| CN102573213A (en) * | 2011-11-28 | 2012-07-11 | 宁波凯耀电器制造有限公司 | LED (Light Emitting Diode) dimming system |
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