CN102202450B - Light-adjustable high-power LED driving power supply - Google Patents
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Abstract
The invention discloses a light-adjustable high-power LED driving power supply, comprising an alternating current input end filter unit, a rectification filter unit, a flyback conversion unit, an auxiliary power supply unit, a single-cycle control unit, a linear optically coupled isolation unit, a constant-current source output end, a constant-current control unit and a PWM (Pulse-Width Modulation) output light adjusting unit. The power supply disclosed by the invention has the advantages as follows: the flyback conversion unit of a main circuit is controlled by the single-cycle control unit;the single-cycle control unit outputs control signal according to output voltage, input current and reference voltage so as to control on and off of a switching tube in the constant-current source output end; therefore, the average value of the output voltage during a switching period is equal to a reference value; the constant-current control unit is provided with an Anti-windup controller whichis capable of effectively preventing integral saturation phenomenon in the control process, so as to keep linear continuity of the controller, keep the output current constant and improve control precision; and the output current is subjected to PWM adjustment so as to continuously adjust light and improve electric energy utilization ratio.
Description
Technical field
The present invention relates to a kind of LED driving power, especially a kind of tunable optical high-power LED driving power source.
Background technology
Development along with human civilization, lighting apparatus enters in the daily life already, traditional lighting source mainly contains incandescent lamp, fluorescent lamp, electricity-saving lamp etc., this type of lighting source technology is comparative maturity all, yet this type of lighting source exist the life-span short, energy consumption is high, luminous efficiency is low even some also can bring pollution, send out opening a novel illumination light source is future trend.
Great power LED is as new type light source, the main advantage that it is compared with conventional light source has: volume is little, power consumption is little, little, life-span of heating is long, response speed is fast, safety, environmental protection, great power LED not only has been successfully applied to some general occasion illumination at present, and its special advantage such as luminous intensity height, long service life, environmental protection can be satisfied the demand of special occasions, along with the exhaustion day by day of resource, high-power LED illumination will replace the lighting source that traditional lighting becomes main flow.
Present great power LED mainly adopts Alternating Current Power Supply, and obtain constant electric current and voltage and power to great power LED through converter, however this mode power factor (PF) end relatively not only, and can not effectively suppress the disturbance that input brings; And light modulation mainly is the electric current that flows through great power LED by change, and under different current conditions, luminous wavelength difference influences luminous efficiency, so there are shortcomings such as antijamming capability is weak, output stability is poor, output accuracy is on the low side, power factor (PF) is low in such circuit.
Summary of the invention
The present invention is primarily aimed at shortcomings such as great power LED circuit antijamming capability is weak, output stability is poor, output accuracy is on the low side, power factor (PF) is low, provides a kind of tunable optical high-power LED driving power source, more stability and high efficiency.
According to technical scheme provided by the invention, described tunable optical high-power LED driving power source comprises: exchange input filter unit, rectification filtering unit, inverse-excitation converting unit, accessory power supply unit, monocycle control unit, linear optical coupling isolated location, constant-current source output, constant current control unit, PWM output light modulation unit; Filter unit, rectification filtering unit are imported in described interchange, the inverse-excitation converting unit connects successively and be connected to the constant-current source output, the output of inverse-excitation converting unit connects the accessory power supply unit, the output of accessory power supply unit connects monocycle control unit, linear optical coupling isolated location, constant current control unit, PWM output light modulation unit respectively, the output of linear optical coupling isolated location connects the inverse-excitation converting unit by the monocycle control unit, and PWM output light modulation unit is connected to the constant-current source output by the constant current control unit; Alternating current outputs to the inverse-excitation converting unit after exchanging input filter unit and rectification filtering unit, the linear optical coupling isolated location is input to the monocycle control unit with the output voltage that detects by the linear optical coupling isolation, the control signal of monocycle control unit is connected with the inverse-excitation converting unit, the size of control inverse-excitation converting unit output voltage; The constant-current source output comprises a Hall current sensor output current that detects is fed back to the constant current control unit; The accessory power supply unit is given monocycle control unit, linear optical coupling isolated location, constant current control unit, PWM output light modulation unit power supply respectively, given voltage is exported in monocycle control unit control inverse-excitation converting unit, constant current control unit control constant-current source output is exported given electric current, and PWM output light modulation unit carries out the light modulation operation by the constant current control unit to great power LED.
Described monocycle control unit control inverse-excitation converting unit suppresses input disturbance; When there is disturbance in the input voltage in the inverse-excitation converting unit, in a switch periods, make the average value of output voltage of inverse-excitation converting unit equal reference value.
Described monocycle control unit obtains reference voltage signal by electric resistance partial pressure from the accessory power supply unit.
Described monocycle control unit is connected with the current sampling resistor of inverse-excitation converting unit, the input current of inverse-excitation converting unit is sampled, and adjust control signal according to sampled signal.
Described monocycle control unit is sampled to output voltage by the light-coupled isolation unit, and adjusts control signal according to sampled signal.
Described constant current control unit adopts conditioning technology Anti-windup algorithm, makes the electric current of constant-current source output keep LINEAR CONTINUOUS, reduces overshoot, improves precision.
Described constant current control unit obtains exporting the size of reference current from the accessory power supply unit by electric resistance partial pressure.
Described constant current control unit is sampled to output current by the Hall current sensor of constant-current source output, and adjusts control signal according to sampled signal.
Described PWM output light modulation unit reaches the purpose of light modulation by the size of regulating PWM waveform pulsewidth.
The present invention uses single cycle controller main circuit inverse-excitation converting unit is controlled, the monocycle control unit provides control signal according to output voltage, input current and reference voltage, the opening and turn-offing of the switching tube of control inverse-excitation converting unit reaches the purpose that in switch periods average value of output voltage equals reference value.The constant current control unit adopts the Anti-windup controller, and Anti-windup can effectively prevent from occurring the integration saturated phenomenon in the control procedure, makes controller keep LINEAR CONTINUOUS, and it is constant to reach output current, improves the purpose of control precision.Output current is carried out PWM regulate, realize continuous light tuning, improve utilization rate of electrical.
Advantage of the present invention is:
1) adopts monocycle control output voltage, voltage accuracy can be controlled in 1%, occur at input terminal voltage under the situation of disturbance, can in a switch periods, make output voltage equal voltage reference value, effectively suppress the influence that the input voltage disturbance brings, regard subsequent conditioning circuit as pure resistance in the monocycle control procedure simultaneously, improved the power factor (PF) of entire circuit.
2) output voltage sampling back is input to the monocycle control unit by the light-coupled isolation unit, and major loop and control loop are effectively isolated.
3) output current detects and adopts Hall current sensor CHB-1, can select model for use is CHB-25NP/SP5, improved the precision that detects, the detection error that can effectively avoid resistance directly to adopt Yin Wendu rising resistance to change and bring has realized the isolation of output circuit and control circuit simultaneously.
4) in constant current control unit strategy, application conditions effect technology Anti-windup algorithm makes the electric current of constant-current source output keep LINEAR CONTINUOUS, reduce overshoot, improve control precision, make system have better dynamic quality and stable state accuracy, improve the precision of output current.
5) adopt the PWM light modulation, can realize the smooth adjustment of LED brightness, can not produce color offset phenomenon because of the change of size of current, improved utilization rate of electrical simultaneously.
Description of drawings
Fig. 1 is circuit structure block diagram of the present invention.
Fig. 2 is integrated circuit schematic diagram of the present invention.
Fig. 3 is monocycle control unit circuit diagram.
Fig. 4 is constant current control unit circuit diagram.
Fig. 5 exchanges input filter unit circuit diagram.
Fig. 6 is PWM output light modulation element circuit figure.
Fig. 7 is light-coupled isolation element circuit figure.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
As shown in Figure 1, the present invention includes: exchange input filter unit, rectification filtering unit, inverse-excitation converting unit, accessory power supply unit, monocycle control unit, linear optical coupling isolated location, constant-current source output, constant current control unit, PWM output light modulation unit; Filter unit, rectification filtering unit are imported in described interchange, the inverse-excitation converting unit connects successively and be connected to the constant-current source output, the output of inverse-excitation converting unit connects the accessory power supply unit, the output of accessory power supply unit connects monocycle control unit, linear optical coupling isolated location, constant current control unit, PWM output light modulation unit respectively, the output of linear optical coupling isolated location connects the inverse-excitation converting unit by the monocycle control unit, and PWM output light modulation unit is connected to the constant-current source output by the constant current control unit; Alternating current outputs to the inverse-excitation converting unit after exchanging input filter unit and rectification filtering unit, the linear optical coupling isolated location is input to the monocycle control unit with the output voltage that detects by the linear optical coupling isolation, the accessory power supply unit is given the monocycle control unit respectively, the linear optical coupling isolated location, the constant current control unit, PWM output light modulation unit power supply, given voltage is exported in monocycle control unit control inverse-excitation converting unit, constant current control unit control constant-current source output is exported given electric current, and PWM output light modulation unit carries out the light modulation operation by the constant current control unit to great power LED.Described PWM output light modulation unit reaches the purpose of light modulation by the size of regulating PWM waveform pulsewidth.
As shown in Figure 2, main circuit input AC 220V voltage inserts rectification filtering unit after importing filtering, rectification filtering unit is by rectifier bridge D2, diode D3, inductance L 3, capacitor C 4, C5 forms, it is as follows that rectification filtering unit connects situation, rectifier bridge D2 output is connected to diode D3 and is connected to the RCD buffer circuit by inductance L 2, capacitor C 4, C5 one end receive respectively inductance L 2 about the end, other end ground connection GND1, the RCD buffer circuit is by resistance R 3, capacitor C 6, diode D6 forms, connect with diode D6 after resistance R 3 and capacitor C 6 parallel connections, the RCD buffer circuit is parallel to the two ends on the former limit of transformer T1 more again.The anode of diode D6 links to each other with switching tube Q1 again, the other end connecting resistance R10 of switching tube Q1, resistance R 10 other end ground connection GND1.The accessory power supply unit can be divided into 3 subelements, be respectively accessory power supply VCC1, accessory power supply VCC2, accessory power supply VCC3, the anode of diode D9 links to each other with the negative electrode of diode D3, the negative electrode series resistance R8 of diode D9, be in series with resistance R 8 after voltage stabilizing didoe D12 and capacitor C 9 are in parallel, the negative electrode of voltage stabilizing didoe is accessory power supply VCC1 again; The anode of diode D8 links to each other with the negative electrode of diode D1, and its negative electrode is connected to resistance R 7, is in series with resistance R 7 after voltage stabilizing didoe D11 and capacitor C 8 are in parallel again, and the negative electrode of voltage stabilizing didoe is VCC2; The negative electrode of diode D7 links to each other with another secondary of transformer T1, and its anode and resistance R 6 are in series, and is in series with resistance R 6 after voltage stabilizing didoe D10 and capacitor C 7 are in parallel again, and the negative electrode of voltage stabilizing didoe D10 is accessory power supply VCC3.Be connected to the Voltage Reference end Vref of monocycle control unit after accessory power supply VCC1 process resistance R 9 and the R11 dividing potential drop, the Q of rest-set flip-flop end links to each other with the grid of switching tube Q1 in the monocycle control unit, the IS-1 end of monocycle control unit links to each other with the source electrode of switching tube Q1, and the VC1 end of monocycle control unit is connected with the VC1 end of linear optical coupling isolated location.Resistance R 1 is with in parallel with diode D1 again after capacitor C 1 is connected, the anode of diode D1 is received the secondary of transformer T1, its negative electrode series inductance L1, capacitor C 2 is connected with diode D1 negative electrode, its other end is received ground GND2, resistance R 2, the R4 series connection is connected to right-hand member and the load LED+ of inductance L 1 again with capacitor C 3 backs in parallel one end, its other end ground connection GND2, the tie point of resistance R 2 and R4 is connected to the Vin end of light-coupled isolation unit, the negative electrode of diode D5 meets load LED+, its anode connects the drain electrode of switching tube Q2 and an end of inductance L 3, the other end of inductance L 3 is connected with load LED-, the source ground GND2 of switching tube Q2, it is CHB-25NP/SP5 that Hall current sensor CHB-1(specifically can select model for use) measure the electric current flow through in the load, its two ends parallel resistance R5, one end ground connection GND3 of resistance R 5, the other end is received the IS-O end of constant current control unit, accessory power supply VCC3 is through resistance R 12, receive the IS-O* end of constant current control unit after the R13 series connection dividing potential drop, the PWM end of PWM output light modulation unit is connected with the PWM end of constant current control unit, and the collector electrode of U6 is connected to the grid of switching tube Q2 in the constant current control unit.
Described constant-current source output comprises Hall current sensor CHB-25NP/SP5, switching tube Q1, load D4, afterflow inductance L 3, sustained diode 5 compositions, and inductance L 3 and sustained diode 5 are to play the effect of afterflow at switching tube Q1 blocking interval.Hall current sensor CHB-25NP/SP5 detects current precision in 0.8%, and the size that can accurately measure output current feeds back in the constant current control unit, realizes the isolation of output current and control circuit simultaneously.
Described monocycle control unit comprises PI regulating circuit, N1/N2 times amplifying circuit (N1/N2 is the former limit of transformer secondary turn ratio), summing circuit, integration reset circuit, comparison circuit, RS circuits for triggering, wherein PI regulating circuit, N1/N2 times amplifying circuit, summing circuit are formed by amplifier and peripheral circuit thereof, the integration reset circuit is by amplifier, reset switch and peripheral circuit and form, comparison circuit is made up of comparator, and the RS circuits for triggering are made up of rest-set flip-flop and clock pulse generator.The monocycle control unit obtains reference voltage signal by electric resistance partial pressure from the accessory power supply unit.As shown in Figure 3, be connected with resistance R 16 with 3 pins of amplifier U1A respectively behind the Voltage Reference end Vref series resistor R18 of monocycle control unit, ground connection GND1 behind the other end series capacitance C10 of resistance R 16, receive 2 pins of amplifier U1A behind the feedback voltage V C1 series resistor R19,2 pins of amplifier connect resistance R 23, receive 1 pin of amplifier U1A behind the resistance R 23 series capacitance C12,1 pin of amplifier U1A is connected with 5 pins of amplifier U1B, 6 pins of amplifier U1B link to each other with an end of resistance R 24 and pass through resistance R 30 ground connection GND1,7 pins of another termination amplifier U1B of resistance R 24,7 pins of amplifier U1B are connected to 10 pins of amplifier U1C by resistance R 15,10 pins of amplifier U1C are by resistance R 14 ground connection GND1, input current test side IS-1 receives 10 pins of amplifier U1C by resistance R 20,9 pins of amplifier U1C are by resistance R 29 ground connection GND1, the two ends of resistance R 28 meet 8 of amplifier U1C respectively, 9 pins, 8 pins of amplifier U1C are received 12 pins of amplifier U1D by resistance R 21,12 pin ground connection GND1, resistance R 17 series capacitance C11 are connected to 12 of amplifier U1D again with after reset switch S1 is in parallel, 14 pins, resistance R 26,14 pins of R27 series connection back one termination amplifier U1D, other end ground connection GND1, resistance R 26, the link of R27 is connected to 13 ends of amplifier U1D, 14 pins of amplifier U1D are connected to 3 pins of comparator U2A by resistance R 22,7 pins of amplifier U1B are connected to 2 pins of comparator U2A by resistance R 25,1 pin of comparator U2A connects the RN end of rest-set flip-flop, the SN termination clock pulse signal of rest-set flip-flop, the QN of rest-set flip-flop terminates to the reset terminal of reset switch S1, and the Q end of rest-set flip-flop is connected to the grid of switching tube Q1.The monocycle control unit is connected with the current sampling resistor of inverse-excitation converting unit, the input current of inverse-excitation converting unit is sampled, and adjust control signal according to sampled signal.The monocycle control unit is sampled to output voltage by the light-coupled isolation unit, and adjusts control signal according to sampled signal.Monocycle control unit control inverse-excitation converting unit, can effectively suppress input disturbance, improve precision and the response speed of output voltage, by sampling input current signal and output voltage signal, according to the signal of giving the controlled switching tube Q1 of determining voltage signal break-make, when there is disturbance in input voltage, can in a switch periods, make average value of output voltage equal reference value, suppress input disturbance.
Monocycle unit controls output voltage, voltage accuracy can be controlled in 1%, occur at input terminal voltage under the situation of disturbance, can in a switch periods, make output voltage equal voltage reference value, effectively suppress the influence that the input voltage disturbance brings, regard subsequent conditioning circuit as pure resistance in the monocycle control procedure simultaneously, improved the power factor (PF) of entire circuit.
The constant current control unit comprises subtractor circuit, PI regulating circuit, ratio regulating circuit, comparison circuit, a NAND gate and an optocoupler.Wherein subtractor circuit, PI regulating circuit are made up of amplifier and peripheral circuit thereof, and the ratio regulating circuit is made up of amplifier, amplitude limiter and peripheral circuit, and comparison circuit is made up of comparator, triangular-wave generator and peripheral circuit.Described constant current control unit obtains exporting the size of reference current from the accessory power supply unit by electric resistance partial pressure.The constant current control unit is sampled to output current by the Hall current sensor of constant-current source output, and adjusts control signal according to sampled signal.As shown in Figure 4, the given load current end IS-O* of constant current control unit is connected to 3 pins of amplifier U4A by resistance R 33,3 pins of amplifier U4A are by resistance R 39 ground connection GND3,2 pins of amplifier U4A are connected to 8 pins of amplifier U4C, 1,2 pins that are connected in parallel on amplifier U4A of resistance R 41 by resistance R 37.1 pin of amplifier U4A is received 5 pins of amplifier U4B by resistance R 35, an end ground connection GND3 behind the resistance R 32 series capacitance C13, the other end is received 5 pins of amplifier U4B, load current IS-O connects 6 pins of amplifier U4B by resistance R 38, be parallel to 6 of amplifier U4B behind the capacitor C 14 series resistance R46,7 pins, 7 pins of amplifier U4B are by resistance R 31 ground connection GND3, receive 10 pins of amplifier U4C by resistance R 34, receive the input of integration amplitude limiter JF1 simultaneously, the output of integration amplitude limiter JF1 is received 9 pins of amplifier U4C by resistance R 40, receive 8 pins of amplifier U4C by resistance R 45, receive 3 pins of comparator U7A by resistance R 36,2 pins of a termination comparator U7A after resistance R 42 is connected with triangular-wave generator SJ1, other end ground connection GND3,1 pin of comparator U7A is received the B end of NAND gate U5, the PWM input is received the A end of NAND gate U5, the output Y of NAND gate U5 receives the light-emitting diode cathode terminal of optocoupler U6 by resistance R 44, the anode tap ground connection GND3 of light-emitting diode, accessory power supply VCC2 connects the collector electrode of triode by resistance R 43, collector electrode output is connected to the grid of switching tube Q2, grounded emitter GND2.
The constant current control unit adopts the Anti-windup controller, and Anti-windup can effectively prevent from occurring the integration saturated phenomenon in the control procedure, makes controller keep LINEAR CONTINUOUS, and it is constant to reach output current, improves the purpose of control precision.The constant current control unit adopts conditioning technology Anti-windup algorithm, makes the electric current of constant-current source output keep LINEAR CONTINUOUS, reduces overshoot, improves control precision, makes system have better dynamic quality and stable state accuracy, improves the precision of output current.
As shown in Figure 5, receive the left upper end of common mode inductance T2 behind the ac input end ACI+ process antisurge resistance R T1 of input filter unit, ac input end ACI-process fuse F1 receives the lower-left end of common mode inductance T1, is parallel to left upper end and the lower-left end of common mode inductance T2 after the piezo-resistance R47 safety capacitor C 15 in parallel again.Be connected respectively to ac output end ACO+ and ac output end ACO-after the upper right side of common mode inductance T2 and the bottom righthand side safety capacitor C 16 in parallel.
Described PWM output light modulation unit comprises 555 timers, the optional NE555CN of model, resistance R 51, R53 variable resistor R52, diode D13, D14, capacitor C 17, C18 can regulate the output duty of ratio by the size of regulating variable resistor R52, reach the purpose of light modulation.As shown in Figure 6, accessory power supply VCC3 receives 4 of 555 timer U11 respectively, one end of 8 pins and resistance R 51, the other end of resistance R 51 is received the end of variable resistance R52, the other end of variable resistance R52 is received the negative electrode of diode D14, the intermediate ends of variable resistance R52 is received 7 pins of 555 timers and the anode of diode D13, the anode of the negative electrode of diode D13 and diode D14 is received 6 of 555 timers, one end of 2 pins and capacitor C 18, the other end ground connection GND3 of capacitor C 18,5 pins of one termination, the 555 timer U11 of capacitor C 17, other end ground connection GND3, the 1 pin ground connection GND3 of 555 timer U11,3 pins connect the PWM output.
In the practical operation, the optional model of 555 timers is NE555CN, only needs to regulate the size of variable resistor R52 in the course of work, can regulate the output duty of ratio, thereby reach the purpose of PWM light modulation.
The linear optical coupling isolated location comprises linear optical coupling HCNR201, divider resistance R2, R4, and input resistance R58, feedback resistance R56, current-limiting resistance R57 isolates the VC1 end that is input to the monocycle control unit with the output voltage that detects through linear optical coupling.As shown in Figure 7, detect voltage Vin and receive 2 pins of amplifier U8A and 3 pins of optocoupler U9 by resistance R 50, the 3 pin ground connection GND2 of amplifier U8A, 1 pin is received 1 pin of optocoupler U9 by resistance R 49,4, the 5 pin ground connection GND2 of optocoupler U9, and 2 pins meet VCC2,7,8 pins are unsettled, 6 pins are received 2 pins of amplifier U10A, and 1 pin that 2 pins of amplifier U10A are received amplifier U10A by resistance R 48 is exported feedback voltage V C1, the 3 pin ground connection GND1 of amplifier U10A.
Detect and feed back to the monocycle control unit after voltage Vin isolates through optocoupler U9, make main circuit and control circuit effective isolation.Can to select model be HCNR201 to optocoupler in practical operation, allows R50 and R48 resistance equate simultaneously in the design process, can realize that size such as input and output isolates.
Claims (8)
1. the tunable optical high-power LED driving power source is characterized in that comprising: exchange input filter unit, rectification filtering unit, inverse-excitation converting unit, accessory power supply unit, monocycle control unit, linear optical coupling isolated location, constant-current source output, constant current control unit, PWM output light modulation unit; Filter unit, rectification filtering unit are imported in described interchange, the inverse-excitation converting unit connects successively and be connected to the constant-current source output, the output of inverse-excitation converting unit connects the accessory power supply unit, the output of accessory power supply unit connects monocycle control unit, linear optical coupling isolated location, constant current control unit, PWM output light modulation unit respectively, the output of linear optical coupling isolated location connects the inverse-excitation converting unit by the monocycle control unit, and PWM output light modulation unit is connected to the constant-current source output by the constant current control unit; Alternating current outputs to the inverse-excitation converting unit after exchanging input filter unit and rectification filtering unit, the linear optical coupling isolated location is input to the monocycle control unit with the output voltage that detects by the linear optical coupling isolation, the control signal of monocycle control unit is connected with the inverse-excitation converting unit, the size of control inverse-excitation converting unit output voltage; The constant-current source output comprises a Hall current sensor output current that detects is fed back to the constant current control unit; The accessory power supply unit is given monocycle control unit, linear optical coupling isolated location, constant current control unit, PWM output light modulation unit power supply respectively, given voltage is exported in monocycle control unit control inverse-excitation converting unit, constant current control unit control constant-current source output is exported given electric current, and PWM output light modulation unit carries out the light modulation operation by the constant current control unit to great power LED;
Described constant current control unit adopts conditioning technology Anti-windup algorithm, makes the electric current of constant-current source output keep LINEAR CONTINUOUS, reduces overshoot, improves precision.
2. tunable optical high-power LED driving power source according to claim 1 is characterized in that: described monocycle control unit control inverse-excitation converting unit, suppress input disturbance; When there is disturbance in the input voltage in the inverse-excitation converting unit, in a switch periods, make the average value of output voltage of inverse-excitation converting unit equal reference value.
3. tunable optical high-power LED driving power source according to claim 1, it is characterized in that: described monocycle control unit obtains reference voltage signal by electric resistance partial pressure from the accessory power supply unit.
4. tunable optical high-power LED driving power source according to claim 1, it is characterized in that: described monocycle control unit is connected with the current sampling resistor of inverse-excitation converting unit, input current to the inverse-excitation converting unit is sampled, and adjusts control signal according to sampled signal.
5. tunable optical high-power LED driving power source according to claim 1, it is characterized in that: described monocycle control unit is sampled to output voltage by the light-coupled isolation unit, and adjusts control signal according to sampled signal.
6. tunable optical high-power LED driving power source according to claim 1, it is characterized in that: described constant current control unit obtains exporting the size of reference current from the accessory power supply unit by electric resistance partial pressure.
7. tunable optical high-power LED driving power source according to claim 1, it is characterized in that: described constant current control unit is sampled to output current by the Hall current sensor of constant-current source output, and adjusts control signal according to sampled signal.
8. tunable optical high-power LED driving power source according to claim 1, it is characterized in that: described PWM output light modulation unit reaches the purpose of light modulation by the size of regulating PWM waveform pulsewidth.
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|---|---|---|---|---|
| CN101217251A (en) * | 2008-01-04 | 2008-07-09 | 华中科技大学 | A monocycle feedforward switch control circuit |
| CN101835317A (en) * | 2010-05-28 | 2010-09-15 | 电子科技大学 | Fly-back street lamp illumination LED constant-current driving power supply with intelligent dimming function |
-
2011
- 2011-07-11 CN CN 201110191869 patent/CN102202450B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101217251A (en) * | 2008-01-04 | 2008-07-09 | 华中科技大学 | A monocycle feedforward switch control circuit |
| CN101835317A (en) * | 2010-05-28 | 2010-09-15 | 电子科技大学 | Fly-back street lamp illumination LED constant-current driving power supply with intelligent dimming function |
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| Publication number | Publication date |
|---|---|
| CN102202450A (en) | 2011-09-28 |
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