CN101711069A - LED driving power supply circuit - Google Patents
LED driving power supply circuit Download PDFInfo
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- CN101711069A CN101711069A CN200910109014A CN200910109014A CN101711069A CN 101711069 A CN101711069 A CN 101711069A CN 200910109014 A CN200910109014 A CN 200910109014A CN 200910109014 A CN200910109014 A CN 200910109014A CN 101711069 A CN101711069 A CN 101711069A
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Abstract
The invention provides an LED driving power supply circuit, belonging to the technical field of the LED driving circuit. The LED driving power supply circuit comprises a power converting circuit, an outputting circuit, an overcurrent protecting circuit, and a pulse width modulating circuit, wherein the power converting circuit can output different power through changing the parameters of elements, and the outputting circuit is connected with the output end of the power converting circuit. The LED driving power supply circuit with the structure can output different power through changing the parameters of part of the elements in the LED driving power supply circuit. The LED driving power supply circuit has the advantages of low design cost and short design time because the LED driving power supply circuit does not need to be changed too much.
Description
Technical field
The invention belongs to the technical field of led drive circuit, relate in particular to a kind of LED driving power circuit.
Background technology
At present; the LED driving power circuit as shown in Figure 1; after the Power Conversion processing of 400V direct voltage process and rectifying and wave-filtering of power conversion circuit 30 with input; by output circuit 20 output stable DC voltages; if the voltage or the electric current of output do not meet the demands; take current foldback circuit 40 that it is protected; specifically; the change in voltage situation of 40 pairs of output circuits of current foldback circuit, 20 outputs detects; pulse-width modulation circuit 10 is according to testing result, and output pulse signal is controlled described power conversion circuit 30 work, thereby guarantees the output constant current; therefore stable voltage just guaranteed the normal of LED operating voltage and electric current.
But in order to satisfy the needs of using, require the LED driving power circuit can export different power,, all will redesign a kind of novel circuit at every turn, so just increased the expense and the time of design at the requirement of different capacity like this for circuit design.
Summary of the invention
The object of the present invention is to provide a kind of LED driving power circuit, be intended to solve existing LED driving power circuit and have the problem that design cost is high and design time is long for the requirement of satisfying the output different capacity.
The present invention is achieved in that a kind of LED driving power circuit, and described LED driving power circuit comprises:
Input is connected with Input voltage terminal, input voltage is carried out Power Conversion handle, by changing component parameters, the power conversion circuit of output different output power;
The output circuit that is connected with the output of described power conversion circuit;
Input is connected with described output circuit, detects the whether current foldback circuit of overcurrent of output current; And
Input is connected with the output of described current foldback circuit, the pulse-width modulation circuit that output is connected with described power conversion circuit, and it is according to the testing result of described current foldback circuit, and output pulse signal is controlled described power conversion circuit work.
In the said structure, described LED driving power circuit also comprises:
Input is connected with described output circuit, and output is connected with described pulse-width modulation circuit, detects the whether overvoltage crowbar of overvoltage of output voltage.
In the said structure; described power conversion circuit comprises transformer; first resistance; second resistance; the 3rd resistance; the 4th resistance; the 5th resistance; the 6th resistance; the 7th resistance; the 8th resistance; the 9th resistance; the tenth resistance; the 11 resistance; the 12 resistance; the 13 resistance; first electric capacity; second electric capacity; the 3rd electric capacity; the 4th electric capacity; the 5th electric capacity; the 6th electric capacity; the 7th electric capacity; the 8th electric capacity; the 9th electric capacity; the tenth electric capacity; the 11 electric capacity; the 12 electric capacity; first diode; second diode; two operational amplification circuits; shunting a reference source that the one or three end is adjustable; the first end ground connection of described the 12 electric capacity; the first termination Input voltage terminal of first primary coil of described transformer; the described pulse-width modulation circuit of second termination of first primary coil of described transformer; the described pulse-width modulation circuit of first termination of second primary coil of described transformer; the second end ground connection of second primary coil of described transformer; first end of first secondary coil of described transformer and the described output circuit of the 3rd termination; second end of first termination the 12 electric capacity of second end of first secondary coil of described transformer and the second subprime coil of transformer; second end of the second subprime coil of transformer is by first diode and first resistance collector electrode that connects first triode of serial connection; the collector electrode of described first triode connects the base stage of first triode by second resistance; the collector electrode of described first triode connects the anode of second diode by first electric capacity; the negative electrode of described second diode connects the base stage of first triode; the emitter of described first triode connects second end of the 12 electric capacity by the 4th electric capacity; the anode of second diode connects second end of the 12 electric capacity; the first via of the emitter of described first triode connects described current foldback circuit by the 6th resistance; the second tunnel first in-phase input end that connects two operational amplification circuits by the 8th resistance and the 11 resistance of serial connection of the emitter of described first triode; the first inverting input first via of two operational amplification circuits connects described current foldback circuit by the 8th electric capacity and the tenth resistance of serial connection; first inverting input the second tunnel of two operational amplification circuits connects described current foldback circuit by the 5th electric capacity; the first inverting input Third Road of two operational amplification circuits connects first end of the 4th resistance; second end of described the 4th resistance connects described output circuit and overvoltage crowbar by the 3rd resistance; second end that second electric capacity and seven resistance of first end of described the 4th resistance by parallel connection connects the 12 electric capacity; first end of second termination the 3rd electric capacity of the 12 electric capacity; the second end first via of the 3rd electric capacity connects output circuit by the 5th resistance; second end the second tunnel of the 3rd electric capacity connects second inverting input of two operational amplification circuits; the second output first via of two operational amplification circuits connects second inverting input by the 9th resistance and the 6th electric capacity of serial connection; second output the second tunnel of two operational amplification circuits connects second inverting input by the 7th electric capacity; the second output Third Road of two operational amplification circuits connects described current foldback circuit; the contact first via of described the 8th resistance and the 11 resistance connects second end of the 12 electric capacity by the adjustable shunting a reference source of the one or three end; the contact the second tunnel of described the 8th resistance and the 11 resistance connects second end of the 12 electric capacity by the 9th electric capacity; the contact Third Road of described the 8th resistance and the 11 resistance is by the 12 resistance and the 13 resistance second end that connects the 12 electric capacity of serial connection; the contact first via of the 12 resistance and the 13 resistance connects second end of the 12 electric capacity by the tenth electric capacity; the contact the second tunnel of the 12 resistance and the 13 resistance connects second in-phase input end of two operational amplification circuits; the positive power source terminal first via of two operational amplification circuits connects the emitter of first triode and the contact of the 8th resistance; the positive power source terminal the second tunnel of two operational amplification circuits connects described overvoltage crowbar, second end of negative supply termination the 12 electric capacity of two operational amplification circuits.
In the said structure, described output circuit comprises the 3rd diode, the 4th diode, the 5th diode, the 6th diode, the 13 electric capacity, the 14 electric capacity, the 15 electric capacity, the 16 electric capacity, the 17 electric capacity, the 14 resistance, the 15 resistance, the 16 resistance, first inductance and second inductance, the anode of described the 3rd diode and the 4th diode connects first end of first secondary coil of described transformer simultaneously, the anode of described the 5th diode and the 6th diode connects the 3rd end of first secondary coil of described transformer simultaneously, described the 3rd diode, the 4th diode, the negative electrode of the 5th diode and the 6th diode connects first end of described first inductance and first end of the 13 electric capacity simultaneously, second end of described first inductance connects first end of second inductance simultaneously, first end of the 14 electric capacity, the 3rd resistance, first end of the 16 electric capacity, first end of the 14 resistance, first end of the 15 resistance, second end while ground connection of the 14 electric capacity and first end of the 15 electric capacity, second end of the 13 electric capacity, second end of the 15 electric capacity, second end of the 16 electric capacity, second end of the 14 resistance and second end of the 15 resistance connect first end of the second subprime coil of first end of the 16 resistance and described transformer simultaneously, second end of the 16 resistance is the cathode output end of described output circuit, second end of second inductance connects described the 5th resistance by the 17 electric capacity, and second end of second inductance is the cathode output end of described output circuit.
In the said structure; described overvoltage crowbar comprises the 17 resistance; the 18 resistance; the 19 resistance; the 20 resistance; the 21 resistance; the 22 resistance; the 18 electric capacity; the shunting a reference source that the two or three end is adjustable and first photoelectrical coupler; described the 3rd resistance of first termination of described the 17 resistance; the second end first via of described the 17 resistance is by the 18 resistance in parallel; the 19 resistance and the 18 electric capacity connect second end of the 12 electric capacity; second end the second tunnel of described the 17 resistance connects the reference utmost point of the adjustable shunting a reference source of the two or three end; the anode of the adjustable shunting a reference source of described the two or three end connects second end of the 12 electric capacity; the negative electrode of the adjustable shunting a reference source of described the two or three end connects the negative electrode of the light-emitting diode of first end of the 21 resistance and first photoelectrical coupler simultaneously; the anode of the light-emitting diode of first photoelectrical coupler connects first end of the 20 resistance; second end of the 20 resistance and the 21 resistance connects the positive power source terminal of described pair of operational amplification circuit simultaneously; the emitter of the triode of described first photoelectrical coupler connects described pulse-width modulation circuit by the 22 resistance, and the collector electrode of the triode of described first photoelectrical coupler directly connects described pulse-width modulation circuit.
In the said structure; described current foldback circuit comprises second photoelectrical coupler; the 7th diode and the 8th diode; the anode of the light-emitting diode of described second photoelectrical coupler connects the 6th resistance; the negative electrode of the light-emitting diode of described second photoelectrical coupler connects the anode of the 7th diode and the 8th diode simultaneously; the negative electrode of described the 7th diode connects second output of two operational amplification circuits; the negative electrode of described the 8th diode connects first output of two operational amplification circuits; the grounded emitter of the triode of described second photoelectrical coupler, the collector electrode of the triode of described second photoelectrical coupler connects described pulse-width modulation circuit.
In the present invention, adopt the structure of this LED driving power circuit,, make the LED driving power circuit can realize different capacity output by changing subelement parameter in the circuit, because need not do big change to circuit, so this circuit has the advantage that design cost is low and design time is short.
Description of drawings
Fig. 1 is the structure chart of existing LED driving power circuit;
Fig. 2 is the structure chart of the LED driving power circuit that provides of the embodiment of the invention;
Fig. 3 is the exemplary circuit figure of the LED driving power circuit that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 2 shows the structure of the LED driving power circuit that the embodiment of the invention provides, and for convenience of explanation, only shows part related to the present invention.
The LED driving power circuit comprises power conversion circuit 300, the output circuit 200, current foldback circuit 400 and the pulse-width modulation circuit 100 that are connected with the output of power conversion circuit 300.
The input of power conversion circuit 300 is connected with Input voltage terminal, input voltage is carried out Power Conversion handle, by changing component parameters, the output different output power; The input of current foldback circuit 400 is connected with output circuit 200, detects whether overcurrent of output current; The input of pulse-width modulation circuit 100 is connected with the output of current foldback circuit 400 respectively; the output of pulse-width modulation circuit 100 is connected with power conversion circuit 300; it is according to the testing result of current foldback circuit 400, and output pulse signal power controlling translation circuit 300 is worked.
As one embodiment of the invention, the LED driving power circuit also comprises overvoltage crowbar 500, and the input of overvoltage crowbar 500 is connected with output circuit 200, and output is connected with pulse-width modulation circuit 100, detects whether overvoltage of output voltage.Pulse-width modulation circuit 100 is according to the testing result of current foldback circuit 400 and overvoltage crowbar 500, and output pulse signal power controlling translation circuit 300 is worked.
Fig. 3 shows the exemplary circuit structure of the LED driving power circuit that the embodiment of the invention provides.
As one embodiment of the invention; power conversion circuit 300 comprises transformer T1; first resistance R 1; second resistance R 2; the 3rd resistance R 3; the 4th resistance R 4; the 5th resistance R 5; the 6th resistance R 6; the 7th resistance R 7; the 8th resistance R 8; the 9th resistance R 9; the tenth resistance R 10; the 11 resistance R 11; the 12 resistance R 12; the 13 resistance R 13; first capacitor C 1; second capacitor C 2; the 3rd capacitor C 3; the 4th capacitor C 4; the 5th capacitor C 5; the 6th capacitor C 6; the 7th capacitor C 7; the 8th capacitor C 8; the 9th capacitor C 9; the tenth capacitor C 10; the 11 capacitor C 11; the 12 capacitor C 12; the first diode D1; the second diode D2; two operational amplification circuit U1; the one or three end is adjustable shunting a reference source U2; the first end ground connection of the 12 capacitor C 12; the first termination 400V Input voltage terminal of first primary coil of transformer T1; the second termination pulse-width modulation circuit 100 of first primary coil of transformer T1; the first termination pulse-width modulation circuit 100 of second primary coil of transformer T1; the second end ground connection of second primary coil of transformer T1; first end of first secondary coil of transformer T1 and the 3rd termination output circuit 200; second end of first termination the 12 capacitor C 12 of second end of first secondary coil of transformer T1 and the second subprime coil of transformer T1; second end of the second subprime coil of transformer T1 is by the first diode D1 and first resistance R 1 collector electrode that meets the first triode Q1 of serial connection; the collector electrode of the first triode Q1 connects the base stage of the first triode Q1 by second resistance R 2; the collector electrode of the first triode Q1 connects the anode of the second diode D2 by first capacitor C 1; the negative electrode of the second diode D2 connects the base stage of the first triode Q1; the emitter of the first triode Q1 connects second end of the 12 capacitor C 12 by the 4th capacitor C 4; the anode of the second diode D2 connects second end of the 12 capacitor C 12; the first via of the emitter of the first triode Q1 is taken over stream protective circuit 400 by the 6th resistance R 6; the second tunnel first in-phase input end that meets two operational amplification circuit U1 by the 8th resistance R 8 and the 11 resistance R 11 of serial connection of the emitter of the first triode Q1; the first inverting input first via of two operational amplification circuit U1 is taken over stream protective circuit 400 by the 8th capacitor C 8 and the tenth resistance R 10 of serial connection; first inverting input the second tunnel of two operational amplification circuit U1 is taken over stream protective circuit 400 by the 5th capacitor C 5; the first inverting input Third Road of two operational amplification circuit U1 connects first end of the 4th resistance R 4; second end of the 4th resistance R 4 connects output circuit 200 and overvoltage crowbar 500 by the 3rd resistance R 3; second end that second capacitor C 2 and seven resistance R 7 of first end of the 4th resistance R 4 by parallel connection connects the 12 capacitor C 12; first end of second termination the 3rd capacitor C 3 of the 12 capacitor C 12; the second end first via of the 3rd capacitor C 3 connects output circuit 200 by the 5th resistance C5; second end the second tunnel of the 3rd capacitor C 3 connects second inverting input of two operational amplification circuit U1; the second output first via of two operational amplification circuit U1 connects second inverting input by the 9th resistance R 9 and the 6th capacitor C 6 of serial connection; second output the second tunnel of two operational amplification circuit U1 connects second inverting input by the 7th capacitor C 7; the second output Third Road of two operational amplification circuit U1 is taken over stream protective circuit 400; the contact first via of the 8th resistance R 8 and the 11 resistance R 11 connects second end of the 12 capacitor C 12 by the adjustable shunting a reference source of the one or three end U2; the contact the second tunnel of the 8th resistance R 8 and the 11 resistance R 11 connects second end of the 12 capacitor C 12 by the 9th capacitor C 9; the contact Third Road of the 8th resistance R 8 and the 11 resistance R 11 is by the 12 resistance R 12 and the 13 resistance R 13 second end that connects the 12 capacitor C 12 of serial connection; the contact first via of the 12 resistance R 12 and the 13 resistance R 13 connects second end of the 12 capacitor C 12 by the tenth capacitor C 10; the contact the second tunnel of the 12 resistance R 12 and the 13 resistance R 13 connects second in-phase input end of two operational amplification circuit U1; the positive power source terminal first via of two operational amplification circuit U1 connects the emitter of the first triode Q1 and the contact of the 8th resistance R 8; the positive power source terminal the second road of two operational amplification circuit U1 is taken over voltage protection circuit 500, second end of negative supply termination the 12 capacitor C 12 of two operational amplification circuit U1.
Output circuit 200 comprises the 3rd diode D3, the 4th diode D4, the 5th diode D5, the 6th diode D6, the 13 capacitor C 13, the 14 capacitor C 14, the 15 capacitor C 15, the 16 capacitor C 16, the 17 capacitor C 17, the 14 resistance R 14, the 15 resistance R 15, the 16 resistance R 16, first inductance L 1 and second inductance L 2, the anode of the 3rd diode D3 and the 4th diode D4 connects first end of first secondary coil of transformer T1 simultaneously, the anode of the 5th diode D5 and the 6th diode D6 connects the 3rd end of first secondary coil of transformer T1 simultaneously, the 3rd diode D3, the 4th diode D4, the negative electrode of the 5th diode D5 and the 6th diode D6 connects first end of first inductance L 1 and first end of the 13 capacitor C 13 simultaneously, second end of first inductance L 1 connects first end of second inductance L 2 simultaneously, first end of the 14 capacitor C 14, the 3rd resistance R 3, first end of the 16 capacitor C 16, first end of the 14 resistance R 14, first end of the 15 resistance R 15, second end while ground connection of the 14 capacitor C 14 and first end of the 15 capacitor C 15, second end of the 13 capacitor C 13, second end of the 15 capacitor C 15, second end of the 16 capacitor C 16, second end of the 14 resistance R 14 and second end of the 15 resistance R 15 connect first end of the second subprime coil of first end of the 16 resistance R 16 and transformer T1 simultaneously, second end of the 16 resistance R 16 is the cathode output end of output circuit 200, second end of second inductance L 1 is the cathode output end of output circuit 200 by second end that the 17 capacitor C 17 connects the 5th resistance R 5, the second inductance L 2.
Overvoltage crowbar 500 comprises the 17 resistance R 17; the 18 resistance R 18; the 19 resistance R 19; the 20 resistance R 20; the 21 resistance R 21; the 22 resistance R 22; the 18 capacitor C 18; the two or three end the is adjustable shunting a reference source U3 and the first photoelectrical coupler U4; first termination the 3rd resistance R 3 of the 17 resistance R 17; the second end first via of the 17 resistance R 17 is by the 18 resistance R 18 in parallel; the 19 resistance R 19 and the 18 capacitor C 18 connect second end of the 12 capacitor C 12; second end the second tunnel of the 17 resistance R 17 connects the reference utmost point of the adjustable shunting a reference source of the two or three end U3; the anode of the two or three end is adjustable shunting a reference source U3 connects second end of the 12 capacitor C 12; the negative electrode of the two or three end is adjustable shunting a reference source U3 connects the negative electrode of the U4 light-emitting diode of first end of the 21 resistance R 21 and first photoelectrical coupler simultaneously; the anode of the light-emitting diode of the first photoelectrical coupler U4 connects first end of the 20 resistance R 20; second end of the 20 resistance R 20 and the 21 resistance R 21 connects the positive power source terminal of two operational amplification circuit U1 simultaneously; the emitter of the triode of the first photoelectrical coupler U4 directly connects pulse-width modulation circuit 100 by the collector electrode that the 22 resistance R 22 connects the triode of pulse-width modulation circuit 100, the first photoelectrical coupler U4.
Pulse-width modulation circuit 100 physical circuits as shown in Figure 3.
Now illustrate and how to pass through to change subelement parameter in the circuit, make the LED driving power circuit can realize different capacity output:
As shown in Figure 3, serial connection one is used for the 16 resistance R 16 of current sampling on the cathode output end of output circuit 200, is used to realize the sampling current of 0.7A.
The voltage sampling end of overvoltage crowbar 500 is connected with the cathode output end of output circuit 200; by changing the resistance value of the 17 resistance R the 17, the 18 resistance R 18, the 19 resistance R 19; just can realize voltage transformation, thereby change the power output of LED driving power circuit.
If that be connected with the LED driving power circuit is 14 LED; the rated current of selecting is 0.7A; rated voltage according to LED work is the gross power that 3.6V calculates the output of LED driving power circuit needs; but consider overvoltage crowbar 500; therefore in design, must consider that output voltage will have certain surplus; output voltage V 1=3.6*14*1.04=52.42V (1.04 is the voltage margin compensating parameter) then; the V1 position and then can calculate the power output P=V1*I1=52.42*0.7=36.7W of LED driving power circuit as shown in the figure.Power output just can obtain various element parameters needed values by Theoretical Calculation after having determined.In order to allow output current guarantee I=0.7A, according to Ohm's law I=V/R, obtain R=V/I, then can obtain the 16 resistance R 16=V3/I, the V3 position as shown in the figure, because two operational amplification circuit U1 adopt chip TSM103, the two or three end is adjustable, and shunting a reference source U3 adopts chip TL431, can obtain V4=2.5V according to its operating characteristic, the V4 position as shown in the figure, then V3=2.5/ (R12+R13) * R13=0.156V promptly obtains R16=0.156/0.7=0.22ohm, by regulating this resistance, just can change the output current of LED driving power circuit.Because chip TSM103 response current is 0.5---2mA, the parameter value of distribution member neatly, get I1=0.5mA, then R17=(V1-V4)/I1=(52.42-2.5)/0.5 ≈ 100kohm calculates R18 and R19 again, because V4=2.5V, I1=0.5mA, then R18*R19/ (R18+R19)=2.5/0.5*1000=5kohm still takes all factors into consideration according to the resistance value of reality, last R18=5.1kohm, R19=68kohm.
Calculate I2=V2/R7=2.5/2.4 ≈ 1.042mA at R3 and R4 again, (R3+R4)=(V1-V2)/I2=(52.42-2.5)/1.042*1000 ≈ 47.9kohm then, get R3=27kohm after distributing according to actual resistance, R4=20kohm, transformer T1 selects EER28-14.By changing the parameter value of the 3rd resistance R 3, the 4th resistance R the 4, the 17 resistance R the 17, the 18 resistance R the 18, the 19 resistance R 19 and transformer T1, the LED driving power circuit just can be realized different capacity output like this.Following table shows concrete experiment parameter:
| Power output output current LED amount R 3 R4 R17 R18 R19 T1 |
| 20 68k of 53W 0.7A, 0 100k 10k 5.1k EER28-20 |
| 16 27k 27k of 42W 0.7A 100k 5.1k 24k EER28-16 |
| 36.7W 14 27k 20k of 0.7A 100k 5.1k 68k EER28-14 |
| 18.4W 7 2k 20k of 0.7A 24k 2.4k Blank EER28-7 |
In embodiments of the present invention, adopt the structure of this LED driving power circuit,, make the LED driving power circuit can realize different capacity output by changing subelement parameter in the circuit, because need not do big change to circuit, so this circuit has the advantage that design cost is low and design time is short.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a LED driving power circuit is characterized in that, described LED driving power circuit comprises:
Input is connected with Input voltage terminal, input voltage is carried out Power Conversion handle, by changing component parameters, the power conversion circuit of output different output power;
The output circuit that is connected with the output of described power conversion circuit;
Input is connected with described output circuit, detects the whether current foldback circuit of overcurrent of output current; And
Input is connected with the output of described current foldback circuit, the pulse-width modulation circuit that output is connected with described power conversion circuit, and it is according to the testing result of described current foldback circuit, and output pulse signal is controlled described power conversion circuit work.
2. LED driving power circuit as claimed in claim 1 is characterized in that, described LED driving power circuit also comprises:
Input is connected with described output circuit, and output is connected with described pulse-width modulation circuit, detects the whether overvoltage crowbar of overvoltage of output voltage.
3. LED driving power circuit as claimed in claim 2; it is characterized in that; described power conversion circuit comprises transformer; first resistance; second resistance; the 3rd resistance; the 4th resistance; the 5th resistance; the 6th resistance; the 7th resistance; the 8th resistance; the 9th resistance; the tenth resistance; the 11 resistance; the 12 resistance; the 13 resistance; first electric capacity; second electric capacity; the 3rd electric capacity; the 4th electric capacity; the 5th electric capacity; the 6th electric capacity; the 7th electric capacity; the 8th electric capacity; the 9th electric capacity; the tenth electric capacity; the 11 electric capacity; the 12 electric capacity; first diode; second diode; two operational amplification circuits; shunting a reference source that the one or three end is adjustable; the first end ground connection of described the 12 electric capacity; the first termination Input voltage terminal of first primary coil of described transformer; the described pulse-width modulation circuit of second termination of first primary coil of described transformer; the described pulse-width modulation circuit of first termination of second primary coil of described transformer; the second end ground connection of second primary coil of described transformer; first end of first secondary coil of described transformer and the described output circuit of the 3rd termination; second end of first termination the 12 electric capacity of second end of first secondary coil of described transformer and the second subprime coil of transformer; second end of the second subprime coil of transformer is by first diode and first resistance collector electrode that connects first triode of serial connection; the collector electrode of described first triode connects the base stage of first triode by second resistance; the collector electrode of described first triode connects the anode of second diode by first electric capacity; the negative electrode of described second diode connects the base stage of first triode; the emitter of described first triode connects second end of the 12 electric capacity by the 4th electric capacity; the anode of second diode connects second end of the 12 electric capacity; the first via of the emitter of described first triode connects described current foldback circuit by the 6th resistance; the second tunnel first in-phase input end that connects two operational amplification circuits by the 8th resistance and the 11 resistance of serial connection of the emitter of described first triode; the first inverting input first via of two operational amplification circuits connects described current foldback circuit by the 8th electric capacity and the tenth resistance of serial connection; first inverting input the second tunnel of two operational amplification circuits connects described current foldback circuit by the 5th electric capacity; the first inverting input Third Road of two operational amplification circuits connects first end of the 4th resistance; second end of described the 4th resistance connects described output circuit and overvoltage crowbar by the 3rd resistance; second end that second electric capacity and seven resistance of first end of described the 4th resistance by parallel connection connects the 12 electric capacity; first end of second termination the 3rd electric capacity of the 12 electric capacity; the second end first via of the 3rd electric capacity connects output circuit by the 5th resistance; second end the second tunnel of the 3rd electric capacity connects second inverting input of two operational amplification circuits; the second output first via of two operational amplification circuits connects second inverting input by the 9th resistance and the 6th electric capacity of serial connection; second output the second tunnel of two operational amplification circuits connects second inverting input by the 7th electric capacity; the second output Third Road of two operational amplification circuits connects described current foldback circuit; the contact first via of described the 8th resistance and the 11 resistance connects second end of the 12 electric capacity by the adjustable shunting a reference source of the one or three end; the contact the second tunnel of described the 8th resistance and the 11 resistance connects second end of the 12 electric capacity by the 9th electric capacity; the contact Third Road of described the 8th resistance and the 11 resistance is by the 12 resistance and the 13 resistance second end that connects the 12 electric capacity of serial connection; the contact first via of the 12 resistance and the 13 resistance connects second end of the 12 electric capacity by the tenth electric capacity; the contact the second tunnel of the 12 resistance and the 13 resistance connects second in-phase input end of two operational amplification circuits; the positive power source terminal first via of two operational amplification circuits connects the emitter of first triode and the contact of the 8th resistance; the positive power source terminal the second tunnel of two operational amplification circuits connects described overvoltage crowbar, second end of negative supply termination the 12 electric capacity of two operational amplification circuits.
4. LED driving power circuit as claimed in claim 3, it is characterized in that, described output circuit comprises the 3rd diode, the 4th diode, the 5th diode, the 6th diode, the 13 electric capacity, the 14 electric capacity, the 15 electric capacity, the 16 electric capacity, the 17 electric capacity, the 14 resistance, the 15 resistance, the 16 resistance, first inductance and second inductance, the anode of described the 3rd diode and the 4th diode connects first end of first secondary coil of described transformer simultaneously, the anode of described the 5th diode and the 6th diode connects the 3rd end of first secondary coil of described transformer simultaneously, described the 3rd diode, the 4th diode, the negative electrode of the 5th diode and the 6th diode connects first end of described first inductance and first end of the 13 electric capacity simultaneously, second end of described first inductance connects first end of second inductance simultaneously, first end of the 14 electric capacity, the 3rd resistance, first end of the 16 electric capacity, first end of the 14 resistance, first end of the 15 resistance, second end while ground connection of the 14 electric capacity and first end of the 15 electric capacity, second end of the 13 electric capacity, second end of the 15 electric capacity, second end of the 16 electric capacity, second end of the 14 resistance and second end of the 15 resistance connect first end of the second subprime coil of first end of the 16 resistance and described transformer simultaneously, second end of the 16 resistance is the cathode output end of described output circuit, second end of second inductance connects described the 5th resistance by the 17 electric capacity, and second end of second inductance is the cathode output end of described output circuit.
5. LED driving power circuit as claimed in claim 4; it is characterized in that; described overvoltage crowbar comprises the 17 resistance; the 18 resistance; the 19 resistance; the 20 resistance; the 21 resistance; the 22 resistance; the 18 electric capacity; the shunting a reference source that the two or three end is adjustable and first photoelectrical coupler; described the 3rd resistance of first termination of described the 17 resistance; the second end first via of described the 17 resistance is by the 18 resistance in parallel; the 19 resistance and the 18 electric capacity connect second end of the 12 electric capacity; second end the second tunnel of described the 17 resistance connects the reference utmost point of the adjustable shunting a reference source of the two or three end; the anode of the adjustable shunting a reference source of described the two or three end connects second end of the 12 electric capacity; the negative electrode of the adjustable shunting a reference source of described the two or three end connects the negative electrode of the light-emitting diode of first end of the 21 resistance and first photoelectrical coupler simultaneously; the anode of the light-emitting diode of first photoelectrical coupler connects first end of the 20 resistance; second end of the 20 resistance and the 21 resistance connects the positive power source terminal of described pair of operational amplification circuit simultaneously; the emitter of the triode of described first photoelectrical coupler connects described pulse-width modulation circuit by the 22 resistance, and the collector electrode of the triode of described first photoelectrical coupler directly connects described pulse-width modulation circuit.
6. LED driving power circuit as claimed in claim 5; it is characterized in that; described current foldback circuit comprises second photoelectrical coupler; the 7th diode and the 8th diode; the anode of the light-emitting diode of described second photoelectrical coupler connects the 6th resistance; the negative electrode of the light-emitting diode of described second photoelectrical coupler connects the anode of the 7th diode and the 8th diode simultaneously; the negative electrode of described the 7th diode connects second output of two operational amplification circuits; the negative electrode of described the 8th diode connects first output of two operational amplification circuits; the grounded emitter of the triode of described second photoelectrical coupler, the collector electrode of the triode of described second photoelectrical coupler connects described pulse-width modulation circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101090146A CN101711069B (en) | 2009-07-21 | 2009-07-21 | LED driving power supply circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101090146A CN101711069B (en) | 2009-07-21 | 2009-07-21 | LED driving power supply circuit |
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| CN101711069A true CN101711069A (en) | 2010-05-19 |
| CN101711069B CN101711069B (en) | 2013-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009101090146A Expired - Fee Related CN101711069B (en) | 2009-07-21 | 2009-07-21 | LED driving power supply circuit |
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| CN101932158A (en) * | 2010-08-17 | 2010-12-29 | 深圳市洲明科技股份有限公司 | Led circuit |
| CN102573182A (en) * | 2010-12-22 | 2012-07-11 | 海洋王照明科技股份有限公司 | Driving protection circuit and lamp |
| CN102752912A (en) * | 2012-06-01 | 2012-10-24 | 台达电子企业管理（上海）有限公司 | Light-emitting diode (LED) driving circuit |
| CN102883511A (en) * | 2012-10-17 | 2013-01-16 | 太仓电威光电有限公司 | Multi-path series-parallel LED (light-emitting diode) load fault protection driving circuit and fault diagnosis and protection method |
| CN103687240A (en) * | 2013-12-17 | 2014-03-26 | 深圳市华星光电技术有限公司 | Overvoltage and overcurrent protective circuit and electronic device |
| CN105873278A (en) * | 2016-05-23 | 2016-08-17 | 东莞市领冠半导体照明有限公司 | Multi-mode light-dimming power circuit |
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| CN201114909Y (en) * | 2007-09-11 | 2008-09-10 | 深圳市九洲光电子有限公司 | A LED street lamp brightness control device |
| CN101677482B (en) * | 2008-09-17 | 2011-03-23 | 深圳市斯派克光电科技有限公司 | Control circuit of intellectualized LED street lamp |
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| CN101932158A (en) * | 2010-08-17 | 2010-12-29 | 深圳市洲明科技股份有限公司 | Led circuit |
| CN101932158B (en) * | 2010-08-17 | 2013-01-23 | 深圳市洲明科技股份有限公司 | Led circuit |
| CN102573182B (en) * | 2010-12-22 | 2014-05-07 | 海洋王照明科技股份有限公司 | Driving protection circuit and lamp |
| CN102573182A (en) * | 2010-12-22 | 2012-07-11 | 海洋王照明科技股份有限公司 | Driving protection circuit and lamp |
| CN102752912A (en) * | 2012-06-01 | 2012-10-24 | 台达电子企业管理（上海）有限公司 | Light-emitting diode (LED) driving circuit |
| CN102752912B (en) * | 2012-06-01 | 2015-11-25 | 台达电子企业管理（上海）有限公司 | A kind of LED drive circuit |
| CN102883511A (en) * | 2012-10-17 | 2013-01-16 | 太仓电威光电有限公司 | Multi-path series-parallel LED (light-emitting diode) load fault protection driving circuit and fault diagnosis and protection method |
| CN102883511B (en) * | 2012-10-17 | 2014-11-05 | 太仓电威光电有限公司 | Multi-path series-parallel LED (light-emitting diode) load fault protection driving circuit and fault diagnosis and protection method |
| CN103687240A (en) * | 2013-12-17 | 2014-03-26 | 深圳市华星光电技术有限公司 | Overvoltage and overcurrent protective circuit and electronic device |
| CN103687240B (en) * | 2013-12-17 | 2016-03-30 | 深圳市华星光电技术有限公司 | Over-voltage over-current protection circuit and electronic installation |
| US9504117B2 (en) | 2013-12-17 | 2016-11-22 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Over-voltage and over-current protection circuits and electronic devices |
| CN105873278A (en) * | 2016-05-23 | 2016-08-17 | 东莞市领冠半导体照明有限公司 | Multi-mode light-dimming power circuit |
| CN107659160A (en) * | 2017-11-10 | 2018-02-02 | 深圳市垅运照明电器有限公司 | A kind of DC DC constant-current circuits |
| CN107659160B (en) * | 2017-11-10 | 2019-11-12 | 深圳市垅运照明电器有限公司 | A kind of DC-DC constant-current circuit |
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