CN204598412U - A kind of LED drive power soft starting circuit - Google Patents
A kind of LED drive power soft starting circuit Download PDFInfo
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- CN204598412U CN204598412U CN201520306211.8U CN201520306211U CN204598412U CN 204598412 U CN204598412 U CN 204598412U CN 201520306211 U CN201520306211 U CN 201520306211U CN 204598412 U CN204598412 U CN 204598412U
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- 230000001052 transient effect Effects 0.000 abstract description 14
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- 230000000694 effects Effects 0.000 description 1
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model discloses a kind of LED drive power soft starting circuit, comprise driver element and soft start unit, described soft start unit connects driver element, described soft start unit controls driver element output voltage when powering on relaxes rising, output voltage transient overshoot can be prevented, also would not produce transient overshoot rush of current LED light source, thus ensure that the useful life of LED light source, also improve the reliability of LED drive circuit.
Description
Technical field
The utility model relates to LED technology field, particularly a kind of LED drive power soft starting circuit.
Background technology
Characteristic due to LED light source determines that LED drive circuit must constant current output.In order to realize constant current output, usually two feedback control loops are set at output.Refer to Fig. 1, when powering on, the electric current that power supply control chip exports carries out power delivery by transformer Tr, then generates output voltage Vout after carrying out rectifying and wave-filtering by the first diode D1, the first electric capacity C1 and the second electric capacity C2.A feedback control loop realizes maximum open circuit voltage and controls, and is made up of output voltage Vout, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 3rd electric capacity C3, shunt reference source S1 and optocoupler IC.Another feedback control loop realizes output current and controls, and is made up of the 5th resistance R5, operational amplifier IC1A, the second diode D2 and optocoupler IC.
Because Voltage Feedback has delayed feature, output voltage is easily caused to produce leading-edge overshoot: to be specially: this LED drive circuit starts moment, the control pole R of shunt reference source S1 is electronegative potential, its negative electrode K exports high level, thus make output voltage Vout first rapidly increase to very high (exceeding default normal value), after drop to normal value.A larger transient overshoot electric current can be produced like this.This transient overshoot electric current can impact LED light source, reduces the life-span of LED light source, reduces the reliability of drive circuit.
Thus prior art need to improve.
Utility model content
In view of above-mentioned the deficiencies in the prior art part, the purpose of this utility model is to provide a kind of LED drive power soft starting circuit, produce leading-edge overshoot to solve output voltage when existing LED drive circuit powers on, and then produce the problem of transient overshoot rush of current LED light source.
In order to achieve the above object, the utility model takes following technical scheme:
A kind of LED drive power soft starting circuit, it comprises: driver element and soft start unit, and described soft start unit connects driver element;
Soft start unit controls driver element output voltage when powering on relaxes rising.
In described LED drive power soft starting circuit, described driver element comprises power supply control chip, transformer, the first diode, the second diode, the first electric capacity, the second electric capacity, the 3rd electric capacity, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, shunt reference source, operational amplifier and optocoupler;
1st end of described transformer, 2nd end, 3rd end all connects power supply control chip, 4th end ground connection of transformer, 7th end of transformer connects the positive pole of the first diode, the negative pole of the first diode is also connected by the first electric capacity, the negative pole of described first diode connects positive pole and the output voltage anode of the second electric capacity, 6th end of the negative pole connection transformer of described second electric capacity, one end of 5th resistance and ground, the other end of described 5th resistance connects the inverting input of output voltage negative terminal and operational amplifier, the in-phase input end input reference voltage of described operational amplifier, the output of operational amplifier connects the negative pole of the second diode, the positive pole of described second diode connects the 2nd pin of optocoupler, one end of 4th resistance and the negative electrode of shunt reference source, 1st pin of described optocoupler connects one end of the 3rd resistance, the other end of described 3rd resistance connects one end of the first resistance, soft start unit and output voltage anode, the other end of described first resistance connects control pole and the soft start unit of shunt reference source, the other end of the first resistance also connects the other end of the 4th resistance by the 3rd electric capacity, the other end of described first resistance also connects anode and the ground of shunt reference source by the second resistance, 3rd pin of described optocoupler is by the 6th grounding through resistance, 4th pin of optocoupler connects power supply control chip.
In described LED drive power soft starting circuit, described soft start unit comprises the 7th resistance, the 4th electric capacity and the 3rd diode; One end of described 4th electric capacity connects one end of the first resistance, the other end of the 4th electric capacity connects one end of the 7th resistance and the positive pole of the 3rd diode, the negative pole of described 3rd diode connects the other end of the first resistance, and the other end of described 7th resistance connects anode and the ground of shunt reference source.
In described LED drive power soft starting circuit, the capacitance of described 4th electric capacity is 10uF, and the resistance of the 7th resistance is 20K Ω.
In described LED drive power soft starting circuit, described soft start unit also comprises the 8th resistance, described 8th resistance and the 4th Capacitance parallel connection.
Compared to prior art, a kind of LED drive power soft starting circuit that the utility model provides, the output voltage being controlled driver element by soft start unit when powering on relaxes rising, output voltage transient overshoot can be prevented, also transient overshoot rush of current LED light source would not be produced, thus ensure that the useful life of LED light source, also improve the reliability of LED drive circuit.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of existing LED drive circuit.
Fig. 2 is the circuit diagram of the utility model LED drive power soft starting circuit preferred embodiment.
Embodiment
The utility model provides a kind of LED drive power soft starting circuit, has soft start function.Namely described soft start function is output voltage is relaxed rise and can not exceed preset maximum value.Output voltage would not be made like this to produce leading-edge overshoot, prevent LED light source to be subject to the impact of transient overshoot electric current, ensure that the useful life of LED light source, also improve the reliability of LED drive circuit.For making the purpose of this utility model, technical scheme and effect clearly, clearly, referring to the accompanying drawing embodiment that develops simultaneously, the utility model is further described.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Refer to Fig. 2, the LED drive power soft starting circuit that the utility model provides comprises driver element 100 and soft start unit 200, and described soft start unit 200 connects driver element 100.Described soft start unit 200 controls driver element 100 output voltage when powering on relaxes rising, can prevent output voltage transient overshoot, also would not produce transient overshoot rush of current LED light source.
Described driver element 100 comprises power supply control chip, transformer Tr, the first diode D1, the second diode D2, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, shunt reference source S1, operational amplifier IC1A and optocoupler IC;
1st end of described transformer Tr, 2nd end, 3rd end all connects power supply control chip, the 4th end ground connection of transformer Tr, 7th end of transformer Tr connects the positive pole of the first diode D1, the negative pole of the first diode D1 is also connected by the first electric capacity C1, the negative pole of described first diode D1 connects positive pole and the output voltage anode Vout+ of the second electric capacity C2, 6th end of the negative pole connection transformer Tr of described second electric capacity C2, one end of 5th resistance R5 and ground, the other end of described 5th resistance R5 connects the inverting input of output voltage negative terminal Vout-and operational amplifier IC1A, the in-phase input end input reference voltage of described operational amplifier IC1A, the output of operational amplifier IC1A connects the negative pole of the second diode D2, the positive pole of described second diode D2 connects the 2nd pin of optocoupler IC, one end of 4th resistance R4 and the negative electrode K of shunt reference source S1, 1st pin of described optocoupler IC connects one end of the 3rd resistance R3, the other end of described 3rd resistance R3 connects one end of the first resistance R1, soft start unit and output voltage anode Vout+, the other end of described first resistance R1 connects control pole R and the soft start unit of shunt reference source S1, the other end of the first resistance R1 also connects the other end of the 4th resistance R4 by the 3rd electric capacity C3, the other end of described first resistance R1 also connects anode A and the ground of shunt reference source S1 by the second resistance R2, 3rd pin of described optocoupler IC is by the 6th resistance R6 ground connection, 4th pin of optocoupler IC connects power supply control chip.
It is to be appreciated that described power supply control chip is prior art.The utility model is not described further the existing operation principle of driver element 100, after emphasis explaination increases soft start unit 200, and the operation principle of driver element 100.
Please continue to refer to Fig. 2, described soft start unit 200 comprises the 7th resistance R7, the 4th electric capacity C4 and the 3rd diode D3; One end of described 4th electric capacity C4 connects one end of the first resistance R1, the other end of the 4th electric capacity C4 connects one end of the 7th resistance R7 and the positive pole of the 3rd diode D3, the negative pole of described 3rd diode D3 connects the other end of the first resistance R1, and the other end of described 7th resistance R7 connects anode A and the ground of shunt reference source S1.
Powered on moment, 4th electric capacity C4 is equivalent to short circuit instantaneously, the control pole R of shunt reference source S1 is high level, the negative electrode of shunt reference source S1 is made to be low level, output voltage Vout can be made like this to relax rise, prevent output voltage transient overshoot, thus prevent LED light source to be subject to the impact of transient overshoot electric current, ensure that the useful life of LED light source, improve the reliability of LED drive power.
Wherein, the 3rd diode D3 has one-way conduction characteristic, can prevent the 7th resistance R7 from affecting the current potential of the control pole R of shunt reference source S1.
Output voltage Vout is full of electricity to the 4th electric capacity C4, discharges in the loop formed by the 7th resistance R7, the first resistance R1 during shutdown.All soft start function can be played when can guarantee each switch like this.
In the present embodiment, can control output voltage Vout in order to ensure powered on moment and relax rising, can not affect again the work of shunt reference source S1, the capacitance unit of described 4th electric capacity C4 is uF, is preferably 10uF.The resistance of described 7th resistance R7 is tens K Ω, is preferably 20K Ω.
4th electric capacity C4 may be longer by the time that the 7th resistance R7, the first resistance R1 discharge, in order to ensure the normal use of soft start function, in the present embodiment, described soft start unit 200 also comprises the 8th resistance R8, and described 8th resistance R8 is in parallel with the 4th electric capacity C4.To the 4th electric capacity C4 repid discharge when 8th resistance R8 can ensure each power cut-off, when ensureing each switch, soft start function can be played.
In sum, a kind of LED drive power soft starting circuit that the utility model provides, by soft start unit, output voltage is relaxed rise and can not preset maximum value be exceeded, so just can prevent output voltage transient overshoot, thus prevent LED light source to be subject to the impact of transient overshoot electric current, ensure that the life-span of LED light source, improve the reliability of LED drive power.
Be understandable that; for those of ordinary skills; can be equal to according to the technical solution of the utility model and utility model design thereof and replace or change, and all these change or replace the protection range that all should belong to the claim appended by the utility model.
Claims (5)
1. a LED drive power soft starting circuit, is characterized in that, comprising: driver element and soft start unit, and described soft start unit connects driver element;
Soft start unit controls driver element output voltage when powering on relaxes rising.
2. LED drive power soft starting circuit according to claim 1, it is characterized in that, described driver element comprises power supply control chip, transformer, the first diode, the second diode, the first electric capacity, the second electric capacity, the 3rd electric capacity, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, shunt reference source, operational amplifier and optocoupler;
1st end of described transformer, 2nd end, 3rd end all connects power supply control chip, 4th end ground connection of transformer, 7th end of transformer connects the positive pole of the first diode, the negative pole of the first diode is also connected by the first electric capacity, the negative pole of described first diode connects positive pole and the output voltage anode of the second electric capacity, 6th end of the negative pole connection transformer of described second electric capacity, one end of 5th resistance and ground, the other end of described 5th resistance connects the inverting input of output voltage negative terminal and operational amplifier, the in-phase input end input reference voltage of described operational amplifier, the output of operational amplifier connects the negative pole of the second diode, the positive pole of described second diode connects the 2nd pin of optocoupler, one end of 4th resistance and the negative electrode of shunt reference source, 1st pin of described optocoupler connects one end of the 3rd resistance, the other end of described 3rd resistance connects one end of the first resistance, soft start unit and output voltage anode, the other end of described first resistance connects control pole and the soft start unit of shunt reference source, the other end of the first resistance also connects the other end of the 4th resistance by the 3rd electric capacity, the other end of described first resistance also connects anode and the ground of shunt reference source by the second resistance, 3rd pin of described optocoupler is by the 6th grounding through resistance, 4th pin of optocoupler connects power supply control chip.
3. LED drive power soft starting circuit according to claim 2, is characterized in that, described soft start unit comprises the 7th resistance, the 4th electric capacity and the 3rd diode; One end of described 4th electric capacity connects one end of the first resistance, the other end of the 4th electric capacity connects one end of the 7th resistance and the positive pole of the 3rd diode, the negative pole of described 3rd diode connects the other end of the first resistance, and the other end of described 7th resistance connects anode and the ground of shunt reference source.
4. LED drive power soft starting circuit according to claim 3, is characterized in that, the capacitance of described 4th electric capacity is 10uF, and the resistance of the 7th resistance is 20K Ω.
5. LED drive power soft starting circuit according to claim 3, is characterized in that, described soft start unit also comprises the 8th resistance, described 8th resistance and the 4th Capacitance parallel connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520306211.8U CN204598412U (en) | 2015-05-13 | 2015-05-13 | A kind of LED drive power soft starting circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520306211.8U CN204598412U (en) | 2015-05-13 | 2015-05-13 | A kind of LED drive power soft starting circuit |
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| CN204598412U true CN204598412U (en) | 2015-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520306211.8U Expired - Fee Related CN204598412U (en) | 2015-05-13 | 2015-05-13 | A kind of LED drive power soft starting circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107733219A (en) * | 2017-11-01 | 2018-02-23 | 广州金升阳科技有限公司 | A kind of Switching Power Supply output soft start circuit |
| CN108832667A (en) * | 2018-05-03 | 2018-11-16 | 许继电源有限公司 | A kind of SS (soft start) control circuit applied to control switch power supply direct current output |
-
2015
- 2015-05-13 CN CN201520306211.8U patent/CN204598412U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107733219A (en) * | 2017-11-01 | 2018-02-23 | 广州金升阳科技有限公司 | A kind of Switching Power Supply output soft start circuit |
| WO2019085544A1 (en) * | 2017-11-01 | 2019-05-09 | 广州金升阳科技有限公司 | Output soft-start circuit for switching power supply |
| CN108832667A (en) * | 2018-05-03 | 2018-11-16 | 许继电源有限公司 | A kind of SS (soft start) control circuit applied to control switch power supply direct current output |
| CN108832667B (en) * | 2018-05-03 | 2020-09-25 | 许继电源有限公司 | Soft start control circuit applied to control of DC output of switching power supply |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150826 |
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| CF01 | Termination of patent right due to non-payment of annual fee |