CN103716952A - LED switch power supply and control method thereof - Google Patents
LED switch power supply and control method thereof Download PDFInfo
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- CN103716952A CN103716952A CN201310421177.4A CN201310421177A CN103716952A CN 103716952 A CN103716952 A CN 103716952A CN 201310421177 A CN201310421177 A CN 201310421177A CN 103716952 A CN103716952 A CN 103716952A
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Abstract
The invention discloses an LED switch power supply and a control method thereof. The power supply comprises a controllable silicon dimmer, a rectification bridge, a PFC power factor correction circuit, a flyback voltage conversion circuit and an output interface. The first input end of the rectification bridge is connected with one end of the controlled silicon dimmer. The other end of the controllable silicon dimmer is connected with one end of an alternating current power supply. The second input end of the rectification bridge is connected with the other end of the alternating current power supply. The grounded end of the rectification bridge is grounded. The output end of the rectification bridge, the PFC power factor correction circuit, the flyback voltage conversion circuit and the output interface are connected in sequence. According to the method, a flyback control chip is used to detect the conduction angle of the controllable silicon dimmer, so that the duty ratio of the output voltage of the output interface is adjusted, and the purpose of dimming is realized. According to the invention, voltage corresponding to the duty ratio is output according to different conduction angles of the controllable silicon dimmer, so that a dimming function is realized without the processing of a post stage circuit; the dimming accuracy is high; and the system cost is reduced.
Description
Technical field
The present invention relates to power technique fields, relate in particular to a kind of LED Switching 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 is associated in load, the duty ratio that needs late-class circuit control switch, realize the change of load average electric current, thereby realize light modulation, switch and the late-class circuit of increase have increased system cost.
China Patent Publication No. 2781641, open day 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 and the control end of power supply switch tube are connected, 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 and the energy storage filter capacitor of transformer 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 that what this Switching Power Supply was exported is a constant voltage, needs late-class circuit to process and could realize LED dimming function, has increased 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, increased the technical problem of cost, a kind of LED Switching Power Supply and control method thereof are provided, it can be according to the voltage of the different angle of flow output duty ratio corresponding of controllable silicon dimmer, thereby process and just can realize dimming function without late-class circuit, light modulation precision is high, has reduced system cost.
In order to address the above problem, the present invention is achieved by the following technical solutions:
A kind of LED Switching 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 to one end of controllable silicon dimmer, the other end of described controllable silicon dimmer is electrically connected to AC power one end, the second input of described rectifier bridge is electrically connected to the other end of AC power, the earth terminal ground connection of described rectifier bridge, the output of described rectifier bridge is electrically connected to the input of PFC circuit of power factor correction, the output of described PFC circuit of power factor correction is electrically connected to flyback voltage converting circuit input, described flyback voltage converting circuit output is electrically connected to output interface.
In the technical program, during use, the positive pole of LED load is electrically connected to output interface, the minus earth of LED load.Can regulate by rotating controllable silicon dimmer upper knob the angle of flow of controllable silicon dimmer.AC power is 220V civil power, from the alternating current of civil power input, through controllable silicon dimmer, obtain an alternating current being notched, 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, improve power factor, PFC circuit of power factor correction can make whole circuit show as resistance characteristic simultaneously, thereby can realize the light modulation of flicker free.The direct current of rectifier bridge output is input to flyback voltage converting circuit after PFC circuit of power factor correction is processed, flyback voltage converting circuit is converted to LED load required voltage by input voltage and exports from output interface, simultaneously, flyback voltage converting circuit detects the voltage of rectifier bridge output, calculate the angle of flow of controllable silicon dimmer, and according to the duty ratio of angle of flow adjustment output interface output voltage, 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 R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 9, capacitor C 1, diode D1, inductance L 1 and N-channel MOS pipe Q1, the output of described rectifier bridge and inductance L 1 one end, resistance R 1 one end and resistance R 9 one end are electrically connected to, inductance L 1 other end is electrically connected to the anode of diode D1 and the drain electrode of N-channel MOS pipe Q1, the negative electrode of diode D1 and resistance R 4 one end, the voltage input end of capacitor C 1 one end and flyback voltage converting circuit is electrically connected to, capacitor C 1 other end ground connection, resistance R 4 other ends are electrically connected to the inverse detection end INV of resistance R 5 one end and PFC control chip, resistance R 5 other end ground connection, resistance R 9 other ends are electrically connected to the power end VCC of PFC control chip and the power input of flyback voltage converting circuit, resistance R 1 other end and resistance R 2 one end, the multiplier input MULT of PFC control chip and the input voltage test side of flyback voltage converting circuit are electrically connected to, resistance R 2 other end ground connection, the drive end GD of PFC control chip is electrically connected to the grid of N-channel MOS pipe Q1, the current sample end CS of PFC control chip is electrically connected to the source electrode of N-channel MOS pipe Q1 and resistance R 3 one end, resistance R 3 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, improves power factor.
As preferably, described flyback voltage converting circuit comprises flyback control chip, resistance R 6, resistance R 7, resistance R 8, capacitor C 2, capacitor C 3, 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 diode D2 with capacitor C 2 one end, capacitor C 2 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 to the grid of N-channel MOS pipe Q2, the drain electrode of N-channel MOS pipe Q2 is electrically connected to the former limit winding different name end of transformer T, the voltage input end that the former limit Motor Winding Same Name of Ends of transformer T is flyback voltage converting circuit, the source electrode of N-channel MOS pipe Q2 is electrically connected to the current sample end CS of resistance R 8 one end and flyback control chip, resistance R 8 other end ground connection, the winding voltage test side FB of flyback control chip is electrically connected to resistance R 6 one end and resistance R 7 one end, resistance R 7 other end ground connection, resistance R 6 other ends are electrically connected to the first secondary winding different name end of transformer T, the first secondary Motor Winding Same Name of Ends ground connection of transformer T, the input voltage test side that the input voltage test side VS of flyback control chip is flyback voltage converting circuit, the earth terminal GND ground connection of flyback control chip, the second secondary winding different name end of transformer T is electrically connected to the anode of diode D3, the negative electrode of diode D3 is electrically connected to capacitor C 3 one end and output interface, capacitor C 3 other ends are electrically connected to the second secondary Motor Winding Same Name of Ends and the ground wire of transformer T.Flyback control chip can adopt IW3620 chip or IW3612 chip.Transformer T is that LED load required voltage is exported from output interface by the voltage transitions of input, flyback control chip detects the voltage of rectifier bridge output by input voltage test side VS, and calculate the angle of flow of controllable silicon dimmer, flyback control chip is adjusted the output of drive end OUT according to the angle of flow, by drive end OUT, control the break-make of N-channel MOS pipe Q2, thereby adjust the duty ratio of 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 output not with electrical network altogether.
A kind of LED Switching Power Supply control method of the present invention, comprises the following steps:
S1: the alternating current of AC power output obtains an alternating current being 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, improves power factor, and the direct current of rectifier bridge output is input to flyback voltage converting circuit after PFC circuit of power factor correction is processed;
S3: flyback control chip detects the voltage of rectifier bridge output by input voltage test side VS, and calculate the angle of flow of controllable silicon dimmer, flyback control chip is adjusted the output of drive end OUT according to the angle of flow, by drive end OUT, control the break-make of N-channel MOS pipe Q2, thereby adjust the duty ratio of 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 periods T2, low frequency switch periods T2 comprise PWM time period D1 and down time section D2, the duty ratio of low frequency switch periods T2 is D1/ (D1+D2), the duty ratio of output interface output voltage namely, flyback control chip is adjusted T2 duty ratio according to the controllable silicon dimmer angle of flow calculating, in time period D1, N-channel MOS pipe Q2 is according to 1 work of HF switch cycle T, 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 is spent, input voltage approaches sinusoidal wave, the input voltage test side VS of flyback control chip detects supply voltage does not have corner cut, the drive end OUT of flyback control chip output is without interrupting pwm signal, N-channel MOS pipe Q2 is according to 1 work of HF switch cycle T, and output interface is exported a direct voltage.When the controllable silicon dimmer angle of flow changes, the input voltage test side VS of flyback control chip detects voltage and is notched, and corner cut size can obtain in computing, this corner cut of flyback control chip internal condition is big or small, adjust drive end OUT output, on the basis of HF switch cycle T 1, introduce another low-frequency cycle T2.We can specify in T2 in the cycle, and the time period that has PWM is D1, and idle time period of switch is D2, the duty ratio that D1/ (D1+D2) is T2, 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 flyback control chip can be because of power down during D2 like this.
As preferably, described HF switch cycle T 1 is 20KHZ ~ 200KHZ, and low frequency switch periods T2 is 100HZ ~ 1KHZ.
Essence effect of the present invention is: (1) can export according to the different angles of flow of controllable silicon dimmer the voltage of duty ratio corresponding, thereby processes and just can realize dimming function without late-class circuit, and light modulation precision is high, has reduced system cost.(2) on the basis of PWM switch periods T1, introduce another low-frequency cycle T2, regulated output size, realized 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 Switching 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 to one end of controllable silicon dimmer 1, the other end of controllable silicon dimmer 1 is electrically connected to AC power 6 one end, the second input of rectifier bridge 2 is electrically connected to 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 to the input of PFC circuit of power factor correction 3, the output of PFC circuit of power factor correction 3 is electrically connected to flyback voltage converting circuit 4 inputs, flyback voltage converting circuit 4 outputs are electrically connected to output interface 5.
As shown in Figure 2, PFC circuit of power factor correction 3 comprises PFC control chip 7, resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 9, capacitor C 1, diode D1, inductance L 1 and N-channel MOS pipe Q1, flyback voltage converting circuit 4 comprises flyback control chip 8, resistance R 6, resistance R 7, resistance R 8, capacitor C 2, capacitor C 3, 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 R 1 one end and resistance R 9 one end are electrically connected to, inductance L 1 other end is electrically connected to the anode of diode D1 and the drain electrode of N-channel MOS pipe Q1, the negative electrode of diode D1 and resistance R 4 one end, the former limit Motor Winding Same Name of Ends of capacitor C 1 one end and transformer T is electrically connected to, capacitor C 1 other end ground connection, resistance R 4 other ends are electrically connected to the inverse detection end INV of resistance R 5 one end and PFC control chip 7, resistance R 5 other end ground connection, resistance R 9 other ends are electrically connected to the power end VCC of PFC control chip 7 and the anode of diode D2, resistance R 1 other end and resistance R 2 one end, the input voltage test side VS of the multiplier input MULT of PFC control chip 7 and flyback control chip 8 is electrically connected to, resistance R 2 other end ground connection, the drive end GD of PFC control chip 7 is electrically connected to the grid of N-channel MOS pipe Q1, the current sample end CS of PFC control chip is electrically connected to the source electrode of N-channel MOS pipe Q1 and resistance R 3 one end, resistance R 3 other end ground connection, the earth terminal GND ground connection of PFC control chip 7, the negative electrode of diode D2 is electrically connected to the power end VCC of capacitor C 2 one end and flyback control chip 8, capacitor C 2 other end ground connection, the drive end OUT of flyback control chip 8 is electrically connected to the grid of N-channel MOS pipe Q2, the drain electrode of N-channel MOS pipe Q2 is electrically connected to the former limit winding different name end of transformer T, the source electrode of N-channel MOS pipe Q2 is electrically connected to the current sample end CS of resistance R 8 one end and flyback control chip 8, resistance R 8 other end ground connection, the winding voltage test side FB of flyback control chip 8 is electrically connected to resistance R 6 one end and resistance R 7 one end, resistance R 7 other end ground connection, resistance R 6 other ends are electrically connected to the first secondary winding different name end of transformer T, the first secondary Motor Winding Same Name of Ends ground connection of transformer T, the earth terminal GND ground connection of flyback control chip 8, the second secondary winding different name end of transformer T is electrically connected to the anode of diode D3, the negative electrode of diode D3 is electrically connected to capacitor C 3 one end and output interface 5, capacitor C 3 other ends are electrically connected to the second secondary Motor Winding Same Name of Ends and the ground wire of transformer T.
The positive pole of LED load 9 is electrically connected to output interface 5, and the negative pole of LED load is electrically connected to 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, from the alternating current of civil power input, through controllable silicon dimmer 1, obtains an alternating current being notched, and this alternating current is input to PFC circuit of power factor correction 3 after rectifier bridge 2 rectifications.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 outputs by multiplier input MULT, by inverse detection end INV, detect output voltage, by current sample end CS sample rate current, by drive end GD, control the break-make of N-channel MOS pipe Q1.PFC circuit of power factor correction 3 makes output current and input voltage same-phase and for sinusoidal wave, improves power factor, and PFC circuit of power factor correction 3 can make whole circuit show as resistance characteristic simultaneously, thereby can realize the light modulation of flicker free.
The direct current of rectifier bridge 2 outputs is input to flyback voltage converting circuit 4 after PFC circuit of power factor correction 3 is processed.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 outputs by input voltage test side VS, by current sample end CS sample rate current, by winding voltage test side FB, detect the voltage of transformer T the first secondary winding, by drive end OUT, control the break-make of N-channel MOS pipe Q2.Transformer T is that LED load 9 required voltages are from output interface 5 outputs by the voltage transitions of input, flyback control chip 8 detects the voltage of rectifier bridge 2 outputs by input voltage test side VS, and calculate the angle of flow of controllable silicon dimmer 1, flyback control chip 8 is adjusted the output of drive end OUT according to the angle of flow, by drive end OUT, control the break-make of N-channel MOS pipe Q2, thereby adjust the duty ratio of output interface 5 output voltages, 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 output not with electrical network altogether.
A kind of LED Switching Power Supply control method of the present embodiment, is applicable to above-mentioned a kind of LED Switching Power Supply, comprises the following steps:
S1: the alternating current of AC power 6 outputs obtains an alternating current being notched after controllable silicon dimmer 1, and this alternating current is input to PFC circuit of power factor correction 3 after rectifier bridge 2 rectifications;
S2:PFC circuit of power factor correction 3 makes output current and input voltage same-phase and for sinusoidal wave, improves power factor, and the direct current of rectifier bridge 2 outputs is input to flyback voltage converting circuit 4 after PFC circuit of power factor correction 3 is processed;
S3: flyback control chip 8 detects the voltage of rectifier bridge 2 outputs by input voltage test side VS, and calculate the angle of flow of controllable silicon dimmer 1, flyback control chip 8 is adjusted the output of drive end OUT according to the angle of flow, by drive end OUT, control the break-make of N-channel MOS pipe Q2, thereby adjust the duty ratio of output interface 5 output voltages, 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 periods T2, as shown in Figure 3.Low frequency switch periods T2 comprise PWM time period D1 and down time section D2, the duty ratio of low frequency switch periods T2 is D1/ (D1+D2), the duty ratio of output interface 5 output voltages namely, flyback control chip 8 is adjusted T2 duty ratio according to controllable silicon dimmer 1 angle of flow calculating, in time period D1, N-channel MOS pipe Q2 is according to 1 work of HF switch cycle T, the voltage of output interface 5 stable outputs, in time period D2, N-channel MOS pipe Q2 disconnects, and output interface 5 is output voltage not.Setting controllable silicon dimmer 1 angle of flow is θ, and the duty ratio of low frequency switch periods T2 is K, K=θ/180 °.
HF switch cycle T 1 is 60KHZ, and low frequency switch periods T2 is 200HZ.When controllable silicon dimmer 1 angle of flow is 180 while spending, input voltage approaches sinusoidal wave, the input voltage test side VS of flyback control chip 8 detects supply voltage does not have corner cut, the drive end OUT of flyback control chip 8 output is without interrupting pwm signal, N-channel MOS pipe Q2 is according to 1 work of HF switch cycle T, and output interface 5 is exported direct voltages.When controllable silicon dimmer 1 angle of flow changes, the input voltage test side VS of flyback control chip 8 detects voltage and is notched, and computing obtains corner cut size, flyback control chip 8 is adjusted drive end OUT output according to this corner cut size, on the basis of HF switch cycle T 1, introduce another low-frequency cycle T2.At T2 in the cycle, the time period that has PWM is D1, idle time period of switch is D2, the duty ratio that D1/ (D1+D2) is T2, by regulating the duty ratio of duty cycle adjustment output interface 5 output voltages 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 flyback control chip 8 can be because of power down during D2 like this.
Claims (6)
1. a LED Switching Power Supply, it is characterized in that: 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 described rectifier bridge (2) is electrically connected to one end of controllable silicon dimmer (1), the other end of described controllable silicon dimmer (1) is electrically connected to AC power (6) one end, the second input of described rectifier bridge (2) is electrically connected to 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 to the input of PFC circuit of power factor correction (3), the output of described PFC circuit of power factor correction (3) is electrically connected to flyback voltage converting circuit (4) input, described flyback voltage converting circuit (4) output is electrically connected to output interface (5).
2. a kind of LED Switching Power Supply according to claim 1, it is characterized in that: described PFC circuit of power factor correction (3) comprises PFC control chip (7), resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 9, capacitor C 1, 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 R 1 one end and resistance R 9 one end are electrically connected to, inductance L 1 other end is electrically connected to the anode of diode D1 and the drain electrode of N-channel MOS pipe Q1, the negative electrode of diode D1 and resistance R 4 one end, the voltage input end of capacitor C 1 one end and flyback voltage converting circuit (4) is electrically connected to, capacitor C 1 other end ground connection, resistance R 4 other ends are electrically connected to the inverse detection end INV of resistance R 5 one end and PFC control chip (7), resistance R 5 other end ground connection, resistance R 9 other ends are electrically connected to the power end VCC of PFC control chip (7) and the power input of flyback voltage converting circuit (4), resistance R 1 other end and resistance R 2 one end, the input voltage test side of the multiplier input MULT of PFC control chip (7) and flyback voltage converting circuit (4) is electrically connected to, resistance R 2 other end ground connection, the drive end GD of PFC control chip (7) is electrically connected to the grid of N-channel MOS pipe Q1, the current sample end CS of PFC control chip (7) is electrically connected to the source electrode of N-channel MOS pipe Q1 and resistance R 3 one end, resistance R 3 other end ground connection, the earth terminal GND ground connection of PFC control chip (7).
3. a kind of LED Switching Power Supply according to claim 2, it is characterized in that: described flyback voltage converting circuit (4) comprises flyback control chip (8), resistance R 6, resistance R 7, resistance R 8, capacitor C 2, capacitor C 3, 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 diode D2 with capacitor C 2 one end, capacitor C 2 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 to the grid of N-channel MOS pipe Q2, the drain electrode of N-channel MOS pipe Q2 is electrically connected to 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 to the current sample end CS of resistance R 8 one end and flyback control chip (8), resistance R 8 other end ground connection, the winding voltage test side FB of flyback control chip (8) is electrically connected to resistance R 6 one end and resistance R 7 one end, resistance R 7 other end ground connection, resistance R 6 other ends are electrically connected to the first secondary winding different name end of transformer T, the first secondary Motor Winding Same Name of Ends ground connection of transformer T, the input voltage test side VS of flyback control chip (8) is the input voltage test side of flyback voltage converting circuit (4), the earth terminal GND ground connection of flyback control chip (8), the second secondary winding different name end of transformer T is electrically connected to the anode of diode D3, the negative electrode of diode D3 is electrically connected to capacitor C 3 one end and output interface, capacitor C 3 other ends are electrically connected to the second secondary Motor Winding Same Name of Ends and the ground wire of transformer T.
4. a LED Switching Power Supply control method, is applicable to a kind of LED Switching Power Supply as claimed in claim 3, it is characterized in that, comprises the following steps:
S1: the alternating current of AC power output obtains an alternating current being 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, improves power factor, and the direct current of rectifier bridge output is input to flyback voltage converting circuit after PFC circuit of power factor correction is processed;
S3: flyback control chip detects the voltage of rectifier bridge output by input voltage test side VS, and calculate the angle of flow of controllable silicon dimmer, flyback control chip is adjusted the output of drive end OUT according to the angle of flow, by drive end OUT, control the break-make of N-channel MOS pipe Q2, thereby adjust the duty ratio of output interface output voltage, cause the average current of LED load to change, realize the object of light modulation.
5. a kind of LED Switching Power Supply control method of stating according to claim 4, it is characterized in that: 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 periods T2, low frequency switch periods T2 comprise PWM time period D1 and down time section D2, the duty ratio of low frequency switch periods T2 is D1/ (D1+D2), the duty ratio of output interface output voltage namely, flyback control chip is adjusted T2 duty ratio according to the controllable silicon dimmer angle of flow calculating, in time period D1, N-channel MOS pipe Q2 is according to 1 work of HF switch cycle T, the voltage of output interface stable output, in time period D2, N-channel MOS pipe Q2 disconnects, output interface is output voltage not.
6. a kind of LED Switching Power Supply control method of stating according to claim 5, is characterized in that: described HF switch cycle T 1 is 20KHZ ~ 200KHZ, and low frequency switch periods T2 is 100HZ ~ 1KHZ.
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| CN113179565A (en) * | 2021-05-06 | 2021-07-27 | 上海奥简微电子科技有限公司 | LED silicon controlled rectifier depth compensation circuit and LED lighting device of adjusting luminance |
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| CN110018413A (en) * | 2019-01-12 | 2019-07-16 | 广东省民防协会 | A kind of multifunctional electric ability meter |
| CN110601566A (en) * | 2019-08-18 | 2019-12-20 | 南京博兰得电子科技有限公司 | Adapter power supply and control method thereof |
| 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 |
| WO2022127351A1 (en) * | 2020-12-14 | 2022-06-23 | 深圳市华浩德电子有限公司 | Floating buck-boost pfc circuit and led driving power supply |
| CN113179565A (en) * | 2021-05-06 | 2021-07-27 | 上海奥简微电子科技有限公司 | LED silicon controlled rectifier depth compensation circuit and LED lighting device of adjusting luminance |
| CN113179565B (en) * | 2021-05-06 | 2024-01-12 | 上海奥简微电子科技有限公司 | LED silicon controlled rectifier dimming depth compensation circuit and LED lighting device |
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