CN101711069B - LED driving power supply circuit - Google Patents

LED driving power supply circuit Download PDF

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Publication number
CN101711069B
CN101711069B CN2009101090146A CN200910109014A CN101711069B CN 101711069 B CN101711069 B CN 101711069B CN 2009101090146 A CN2009101090146 A CN 2009101090146A CN 200910109014 A CN200910109014 A CN 200910109014A CN 101711069 B CN101711069 B CN 101711069B
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electric capacity
connects
circuit
diode
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CN101711069A (en
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周明杰
彭进
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Oceans King Lighting Science and Technology Co Ltd
Shenzhen Oceans King Lighting Science and Technology Co Ltd
Shenzhen Oceans King Lighting Engineering Co Ltd
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Oceans King Lighting Science and Technology Co Ltd
Shenzhen Oceans King Lighting Engineering Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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    • Y02B20/40Control techniques providing energy savings, e.g. smart controller or presence detection

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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

A kind of LED driving power circuit
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 stable output direct voltages; if 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 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, like this for circuit design, all will redesign a kind of novel circuit for the requirement of different capacity at every turn, so just increased expense and the time of 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 process, 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;
Described power conversion circuit comprises following element:
Transformer, the first resistance, the 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, the first electric capacity, the 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, the first diode, the second diode, two operational amplification circuits, the one or three end adjustable shunt reference source;
The first end ground connection of described the 12 electric capacity; the first termination Input voltage terminal of the first primary coil of described transformer; the described pulse-width modulation circuit of the second termination of the first primary coil of described transformer; the described pulse-width modulation circuit of the first termination of the second primary coil of described transformer; the second end ground connection of the second primary coil of described transformer; the first end of the first secondary coil of described transformer and the described output circuit of the 3rd termination; the second end of the first termination the 12 electric capacity of the second end of the first secondary coil of described transformer and the second subprime coil of transformer; the second end of the second subprime coil of transformer is by the first diode and the first resistance collector electrode of connecing the first triode of serial connection; the collector electrode of described the first triode connects the base stage of the first triode by the second resistance; the collector electrode of described the first triode connects the anode of the second diode by the first electric capacity; the negative electrode of described the second diode connects the base stage of the first triode; the emitter of described the first triode connects the second end of the 12 electric capacity by the 4th electric capacity; the anode of the second diode connects the second end of the 12 electric capacity; the first via of the emitter of described the first triode connects described current foldback circuit by the 6th resistance; the the second tunnel the 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 the 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; the 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 the first end of the 4th resistance; the second end of described the 4th resistance connects described output circuit and overvoltage crowbar by the 3rd resistance; the second end that second electric capacity and seven resistance of the first end of described the 4th resistance by parallel connection connects the 12 electric capacity; the first end of the 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; the second end the second tunnel of the 3rd electric capacity connects the second inverting input of two operational amplification circuits; the second output first via of two operational amplification circuits connects the second inverting input by the 9th resistance and the 6th electric capacity of serial connection; the second output the second tunnel of two operational amplification circuits connects the 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 the second end of the 12 electric capacity by the one or three end adjustable shunt reference source; the contact the second tunnel of described the 8th resistance and the 11 resistance connects the 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 the 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 the 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 the 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, the second end of negative supply termination the 12 electric capacity of two operational amplification circuits.
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 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, the first inductance and the second inductance, the anode of described the 3rd diode and the 4th diode connects the first end of the first secondary coil of described transformer simultaneously, the anode of described the 5th diode and the 6th diode connects the 3rd end of the 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 the first end of described the first inductance and the first end of the 13 electric capacity simultaneously, the second end of described the first inductance connects the first end of the second inductance simultaneously, the first end of the 14 electric capacity, the 3rd resistance, the first end of the 16 electric capacity, the first end of the 14 resistance, the first end of the 15 resistance, the second end while ground connection of the 14 electric capacity and the first end of the 15 electric capacity, the second end of the 13 electric capacity, the second end of the 15 electric capacity, the second end of the 16 electric capacity, the second end of the 14 resistance and the second end of the 15 resistance connect the first end of the second subprime coil of the first end of the 16 resistance and described transformer simultaneously, the second end of the 16 resistance is the cathode output end of described output circuit, the second end of the second inductance connects described the 5th resistance by the 17 electric capacity, and the second end of the 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 two or three end adjustable shunt reference source and the first photoelectrical coupler; described the 3rd resistance of the 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 the second end of the 12 electric capacity; the second end the second tunnel of described the 17 resistance connects the reference utmost point of the two or three end adjustable shunt reference source; the anode of described the two or three end adjustable shunt reference source connects the second end of the 12 electric capacity; the negative electrode of described the two or three end adjustable shunt reference source connects the negative electrode of the light-emitting diode of the first end of the 21 resistance and the first photoelectrical coupler simultaneously; the anode of the light-emitting diode of the first photoelectrical coupler connects the first end of the 20 resistance; the 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 the first photoelectrical coupler connects described pulse-width modulation circuit by the 22 resistance, and the collector electrode of the triode of described the first photoelectrical coupler directly connects described pulse-width modulation circuit.
In the said structure; described current foldback circuit comprises the second photoelectrical coupler; the 7th diode and the 8th diode; the anode of the light-emitting diode of described the second photoelectrical coupler connects the 6th resistance; the negative electrode of the light-emitting diode of described the second photoelectrical coupler connects the anode of the 7th diode and the 8th diode simultaneously; the negative electrode of described the 7th diode connects the second output of two operational amplification circuits; the negative electrode of described the 8th diode connects the first output of two operational amplification circuits; the grounded emitter of the triode of described the second photoelectrical coupler, the collector electrode of the triode of described the second photoelectrical coupler connects described pulse-width modulation circuit.
In the present invention, adopt the structure of this LED driving power circuit, by changing subelement parameter in the circuit, so that the LED driving power circuit can be realized different capacity output, because need not do large 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, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit 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 process, 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 ratio control 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 ratio control 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; the first resistance R 1; the 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; the first capacitor C 1; the 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 adjustable shunt reference source U2; the first end ground connection of the 12 capacitor C 12; the first termination 400V Input voltage terminal of the first primary coil of transformer T1; the second termination pulse-width modulation circuit 100 of the first primary coil of transformer T1; the first termination pulse-width modulation circuit 100 of the second primary coil of transformer T1; the second end ground connection of the second primary coil of transformer T1; the first end of the first secondary coil of transformer T1 and the 3rd termination output circuit 200; the second end of the first termination the 12 capacitor C 12 of the second end of the first secondary coil of transformer T1 and the second subprime coil of transformer T1; the second end of the second subprime coil of transformer T1 is by the first diode D1 and the first resistance R 1 collector electrode of meeting 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 the second resistance R 2; the collector electrode of the first triode Q1 connects the anode of the second diode D2 by the 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 the second end of the 12 capacitor C 12 by the 4th capacitor C 4; the anode of the second diode D2 connects the 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 the second tunnel the 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; the 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 the first end of the 4th resistance R 4; the second end of the 4th resistance R 4 connects output circuit 200 and overvoltage crowbar 500 by the 3rd resistance R 3; the second end that second capacitor C 2 and seven resistance R 7 of the first end of the 4th resistance R 4 by parallel connection connects the 12 capacitor C 12; the first end of the 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; the second end the second tunnel of the 3rd capacitor C 3 connects the second inverting input of two operational amplification circuit U1; the second output first via of two operational amplification circuit U1 connects the second inverting input by the 9th resistance R 9 and the 6th capacitor C 6 of serial connection; the second output the second tunnel of two operational amplification circuit U1 connects the 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 the second end of the 12 capacitor C 12 by the one or three end adjustable shunt reference source U2; the contact the second tunnel of the 8th resistance R 8 and the 11 resistance R 11 connects the 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 the 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 the 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, the 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, the first inductance L 1 and the second inductance L 2, the anode of the 3rd diode D3 and the 4th diode D4 connects the first end of the first secondary coil of transformer T1 simultaneously, the anode of the 5th diode D5 and the 6th diode D6 connects the 3rd end of the 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 the first end of the first inductance L 1 and the first end of the 13 capacitor C 13 simultaneously, the second end of the first inductance L 1 connects the first end of the second inductance L 2 simultaneously, the first end of the 14 capacitor C 14, the 3rd resistance R 3, the first end of the 16 capacitor C 16, the first end of the 14 resistance R 14, the first end of the 15 resistance R 15, the second end while ground connection of the 14 capacitor C 14 and the first end of the 15 capacitor C 15, the second end of the 13 capacitor C 13, the second end of the 15 capacitor C 15, the second end of the 16 capacitor C 16, the second end of the 14 resistance R 14 and the second end of the 15 resistance R 15 connect the first end of the second subprime coil of the first end of the 16 resistance R 16 and transformer T1 simultaneously, the second end of the 16 resistance R 16 is the cathode output end of output circuit 200, the second end of the second inductance L 1 is the cathode output end of output circuit 200 by the 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 adjustable shunt reference source U3 and the first photoelectrical coupler U4; the 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 the second end of the 12 capacitor C 12; the second end the second tunnel of the 17 resistance R 17 connects the reference utmost point of the two or three end adjustable shunt reference source U3; the anode of the two or three end adjustable shunt reference source U3 connects the second end of the 12 capacitor C 12; the negative electrode of the two or three end adjustable shunt reference source U3 connects the negative electrode of the U4 light-emitting diode of the first end of the 21 resistance R 21 and the first photoelectrical coupler simultaneously; the anode of the light-emitting diode of the first photoelectrical coupler U4 connects the first end of the 20 resistance R 20; the 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.
Current foldback circuit 400 comprises the second photoelectrical coupler U5; the 7th diode D7 and the 8th diode D8; the anode of the light-emitting diode of the second photoelectrical coupler U5 connects the 6th resistance R 6; the negative electrode of the light-emitting diode of the second photoelectrical coupler U5 connects the anode of the 7th diode D7 and the 8th diode D8 simultaneously; the negative electrode of the 7th diode D7 connects the second output of two operational amplification circuit U1; the negative electrode of the 8th diode D8 connects the first output of two operational amplification circuit U1; the grounded emitter of the triode of the second photoelectrical coupler U5, the collector electrode of the triode of the second photoelectrical coupler U5 connects pulse-width modulation circuit 100.
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, so that the LED driving power circuit can be realized different capacity output:
As shown in Figure 3, be used for the 16 resistance R 16 of current sampling in the cathode output end of output circuit 200 serial connection one, be used for realizing 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 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 calculate the needed parameter value of various elements by theory 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 adjustable shunt 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 namely 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, R18*R19/ (R18+R19)=2.5/0.5*1000=5kohm then, but consider according to the resistance value of reality, last R18=5.1kohm, R19=68kohm.
Calculate I2=V2/R7=2.5/2.4 ≈ 1.042mA for 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 4, the 17 resistance R 17, the 18 resistance R 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:
Figure GSB00000916065200101
In embodiments of the present invention, adopt the structure of this LED driving power circuit, by changing subelement parameter in the circuit, so that the LED driving power circuit can be realized different capacity output, because need not do large 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 limiting the present invention, all any modifications of doing 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 (5)

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 process, 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;
Described power conversion circuit comprises following element:
Transformer, the first resistance, the 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, the first electric capacity, the 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, the first diode, the second diode, two operational amplification circuits, the one or three end adjustable shunt reference source;
The first end ground connection of described the 12 electric capacity; the first termination Input voltage terminal of the first primary coil of described transformer; the described pulse-width modulation circuit of the second termination of the first primary coil of described transformer; the described pulse-width modulation circuit of the first termination of the second primary coil of described transformer; the second end ground connection of the second primary coil of described transformer; the first end of the first secondary coil of described transformer and the described output circuit of the 3rd termination; the second end of the first termination the 12 electric capacity of the second end of the first secondary coil of described transformer and the second subprime coil of transformer; the second end of the second subprime coil of transformer is by the first diode and the first resistance collector electrode of connecing the first triode of serial connection; the collector electrode of described the first triode connects the base stage of the first triode by the second resistance; the collector electrode of described the first triode connects the anode of the second diode by the first electric capacity; the negative electrode of described the second diode connects the base stage of the first triode; the emitter of described the first triode connects the second end of the 12 electric capacity by the 4th electric capacity; the anode of the second diode connects the second end of the 12 electric capacity; the first via of the emitter of described the first triode connects described current foldback circuit by the 6th resistance; the the second tunnel the 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 the 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; the 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 the first end of the 4th resistance; the second end of described the 4th resistance connects described output circuit and overvoltage crowbar by the 3rd resistance; the second end that second electric capacity and seven resistance of the first end of described the 4th resistance by parallel connection connects the 12 electric capacity; the first end of the 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; the second end the second tunnel of the 3rd electric capacity connects the second inverting input of two operational amplification circuits; the second output first via of two operational amplification circuits connects the second inverting input by the 9th resistance and the 6th electric capacity of serial connection; the second output the second tunnel of two operational amplification circuits connects the 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 the second end of the 12 electric capacity by the one or three end adjustable shunt reference source; the contact the second tunnel of described the 8th resistance and the 11 resistance connects the 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 the 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 the 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 the 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, the second end of negative supply termination the 12 electric capacity of two operational amplification circuits.
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 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, the first inductance and the second inductance, the anode of described the 3rd diode and the 4th diode connects the first end of the first secondary coil of described transformer simultaneously, the anode of described the 5th diode and the 6th diode connects the 3rd end of the 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 the first end of described the first inductance and the first end of the 13 electric capacity simultaneously, the second end of described the first inductance connects the first end of the second inductance simultaneously, the first end of the 14 electric capacity, the 3rd resistance, the first end of the 16 electric capacity, the first end of the 14 resistance, the first end of the 15 resistance, the second end while ground connection of the 14 electric capacity and the first end of the 15 electric capacity, the second end of the 13 electric capacity, the second end of the 15 electric capacity, the second end of the 16 electric capacity, the second end of the 14 resistance and the second end of the 15 resistance connect the first end of the second subprime coil of the first end of the 16 resistance and described transformer simultaneously, the second end of the 16 resistance is the cathode output end of described output circuit, the second end of the second inductance connects described the 5th resistance by the 17 electric capacity, and the second end of the second inductance is the cathode output end of described output circuit.
4. LED driving power circuit as claimed in claim 3; 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 two or three end adjustable shunt reference source and the first photoelectrical coupler; described the 3rd resistance of the 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 the second end of the 12 electric capacity; the second end the second tunnel of described the 17 resistance connects the reference utmost point of the two or three end adjustable shunt reference source; the anode of described the two or three end adjustable shunt reference source connects the second end of the 12 electric capacity; the negative electrode of described the two or three end adjustable shunt reference source connects the negative electrode of the light-emitting diode of the first end of the 21 resistance and the first photoelectrical coupler simultaneously; the anode of the light-emitting diode of the first photoelectrical coupler connects the first end of the 20 resistance; the 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 the first photoelectrical coupler connects described pulse-width modulation circuit by the 22 resistance, and the collector electrode of the triode of described the first photoelectrical coupler directly connects described pulse-width modulation circuit.
5. LED driving power circuit as claimed in claim 4; it is characterized in that; described current foldback circuit comprises the second photoelectrical coupler; the 7th diode and the 8th diode; the anode of the light-emitting diode of described the second photoelectrical coupler connects the 6th resistance; the negative electrode of the light-emitting diode of described the second photoelectrical coupler connects the anode of the 7th diode and the 8th diode simultaneously; the negative electrode of described the 7th diode connects the second output of two operational amplification circuits; the negative electrode of described the 8th diode connects the first output of two operational amplification circuits; the grounded emitter of the triode of described the second photoelectrical coupler, the collector electrode of the triode of described the second photoelectrical coupler connects described pulse-width modulation circuit.
CN2009101090146A 2009-07-21 2009-07-21 LED driving power supply circuit Expired - Fee Related CN101711069B (en)

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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
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
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
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
CN105873278B (en) * 2016-05-23 2017-08-18 东莞市领冠半导体照明有限公司 A kind of multi-mode dimming power source circuit
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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