CN202906730U - Self-switching-on-off starting control circuit used for LED flyback driving power supply - Google Patents

Self-switching-on-off starting control circuit used for LED flyback driving power supply Download PDF

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Publication number
CN202906730U
CN202906730U CN 201220481124 CN201220481124U CN202906730U CN 202906730 U CN202906730 U CN 202906730U CN 201220481124 CN201220481124 CN 201220481124 CN 201220481124 U CN201220481124 U CN 201220481124U CN 202906730 U CN202906730 U CN 202906730U
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CN
China
Prior art keywords
capacitor
control circuit
led
diode
semiconductor
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Expired - Fee Related
Application number
CN 201220481124
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Chinese (zh)
Inventor
肖应梅
邱治富
黄志伟
韦荣师
丁成林
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Shenzhen Puguang Energy Saving Technology Co., Ltd.
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肖应梅
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Priority to CN 201220481124 priority Critical patent/CN202906730U/en
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Publication of CN202906730U publication Critical patent/CN202906730U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a self-switching-on-off starting control circuit used for LED flyback driving power supply, which comprises a rectifier bridge. The AC input end of the rectifier bridge is connected with an electrical network through a switch. The negative pole of the DC output end of the rectifier bridge is grounded, and the positive pole of the DC output end is grounded through a first capacitor, a first resistor and a second capacitor which are successively connected in series. The connection point between the first resistor and the second capacitor is also connected with the drain electrode of a MOS tube through a current-limiting resistor. The connection point between the first resistor and the second capacitor is also connected with a grid electrode of the MOS tube. The source electrode of the MOS tube is also connected with an anode of a freewheeling diode. The cathode of the freewheeling diode is grounded through a third capacitor. The connection point between the freewheeling diode and the third capacitor is a PWM power source end. The PWM power source end is also connected with the cathode of a first diode. The anode of the first diode is grounded through an auxiliary main winding of an LED power transformer. The self-switching-on-off starting control circuit has the following functions: reducing power consumption, and prolonging service life of a whole machine.

Description

A kind of certainly shutoff startup control circuit that instead swashs driving power for LED
Technical field
The utility model relates to LED and drives the field, relates in particular to a kind of certainly shutoff startup control circuit that instead swashs driving power for LED.
Background technology
LED inverse-excitation type driving power refers to use the anti-Switching Power Supply that high frequency transformer will be inputted, output loop is isolated that swashs, and its overall volume is little, simple in structure, in the Alternating Current Power Supply occasion, is used widely.In the LED inverse-excitation type driving power, when switching tube was connected, output transformer served as inductance, and electric energy conversion is magnetic energy, at this moment the output loop no current; On the contrary, when switching tube turn-offed, output transformer released energy, and magnetic energy is converted into electric energy, and electric current is arranged in the output loop.LED inverse-excitation type driving power is starting moment, need to press from power taking on the input line, and to the pwm chip power supply, when the startup event is finished, pwm chip is powered by the ancillary coil winding.Generally, LED inverse-excitation type driving power need to add start-up circuit, extensively adopt from input at present and directly power to pwm chip by the resistance current limliting, there is following shortcoming in the sort circuit structure: start-up circuit is not in power-up state for a long time owing to not possessing from turn-off function, after power supply has started, current-limiting resistance still has electric current to flow through, and consumes certain power, affects overall efficiency and useful life.
The utility model content
The technical problems to be solved in the utility model is, provides a kind of certainly shutoff that instead swashs driving power for LED to start control circuit, improving the overall efficiency of power supply, and increases the service life.
For solving the problems of the technologies described above, the utility model adopts following technical scheme.
The utility model discloses a kind of certainly shutoff startup control circuit that instead swashs driving power for LED, it includes a rectifier bridge, first electric capacity of the dc output end of described rectifier bridge by connecting successively, the first resistance and the second capacity earth, the tie point of the first resistance and the second electric capacity also is connected to the drain electrode of a metal-oxide-semiconductor by a current-limiting resistance, the tie point of the first resistance and the second electric capacity also is connected to the grid of metal-oxide-semiconductor, the source electrode of metal-oxide-semiconductor is connected to the negative electrode of one first voltage-stabiliser tube, the plus earth of the first voltage-stabiliser tube, the source electrode of metal-oxide-semiconductor also is connected to the anode of a fly-wheel diode, the negative electrode of fly-wheel diode is by one the 3rd capacity earth, the tie point of fly-wheel diode and the 3rd electric capacity is the PWM power end, this PWM power end also is connected to the negative electrode of one first diode, and the anode of this first diode is by the secondary main winding ground connection of LED power transformer.
Preferably, the tie point of the first resistance and the second electric capacity also is connected to the negative electrode of one second voltage-stabiliser tube, the plus earth of the second voltage-stabiliser tube.
Preferably, the ac input end of described rectifier bridge also is connected to electrical network by a switch.
The disclosed a kind of certainly shutoff startup control circuit that instead swashs driving power for LED of the utility model, by controlling the open-minded of metal-oxide-semiconductor, make PWM power end VCC produce starting resistor, when closing, metal-oxide-semiconductor has no progeny, be the 3rd capacitor charging by auxiliary winding, make the PWM power end produce continuous voltage and be the PWM chip power supply.The sort circuit structure has the control metal-oxide-semiconductor from the effect of turn-offing, and compares existing startup control circuit, and the utility model can not be in power-up state for a long time, has avoided the consumption to power, simultaneously, has also improved the useful life of complete machine.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with drawings and Examples the utility model is done more detailed description.
The utility model discloses a kind of certainly shutoff startup control circuit that instead swashs driving power for LED, as shown in Figure 1, it includes a rectifier bridge DB1, first capacitor C 1 of the dc output end of described rectifier bridge DB1 by connecting successively, the first resistance R 1 and the second capacitor C 2 ground connection, the tie point of the first resistance and the second electric capacity also is connected to the drain electrode of a metal-oxide-semiconductor Q1 by a current-limiting resistance R2, the tie point of the first resistance R 1 and the second capacitor C 2 also is connected to the grid of metal-oxide-semiconductor Q1, the source electrode of metal-oxide-semiconductor Q1 is connected to the negative electrode of one first voltage-stabiliser tube DZ1, the plus earth of the first voltage-stabiliser tube DZ2, the source electrode of metal-oxide-semiconductor Q1 also is connected to the anode of a sustained diode 2, the negative electrode of sustained diode 2 is by one the 3rd capacitor C, 3 ground connection, the tie point of sustained diode 2 and the 3rd capacitor C 3 is PWM power end VCC, this PWM power end VCC also is connected to the negative electrode of one first diode D1, and the anode of this first diode D1 is by the secondary main winding T1 ground connection of LED power transformer.
In the foregoing circuit structure, when the ac input end of rectifier bridge DB1 accesses electrical network, electric current is by the first capacitor C 1, the first resistance R 1 and the second capacitor C 2 circulate to ground, the first capacitor C 1 and the charging of the second capacitor C 2 and the voltage of the two rising of starting from scratch this moment, when the voltage of the second capacitor C 2 rise to metal-oxide-semiconductor Q1 open threshold values the time, metal-oxide-semiconductor Q1 conducting, at this moment, electric current is by the first rectifying tube DB1, the first capacitor C 1, the first resistance R 1, sustained diode 2 and the 3rd capacitor C 3 ground connection, at this moment, the charging of the 3rd capacitor C 3 and its charging voltage rise to the clamp voltage of DZ2, make PWM power end VCC produce voltage and are the PWM chip power supply.After the first capacitor C 1 and the second capacitor C 2 were full of electricity, the electric current that flows through the first resistance R 1 was zero, and the voltage of the second capacitor C 2 constantly reduces, until metal-oxide-semiconductor Q1 turn-offs the start-up circuit cut-off.At this moment, the 3rd capacitor C 3, auxiliary winding T1 and the first diode D1 form the loop, and the 3rd capacitor C 3 continues to provide charging current by auxiliary winding T1, take make that PWM power end VCC can continue as the PWM chip power supply, circuit start is finished.In this circuit, open-minded by control metal-oxide-semiconductor Q1 makes PWM power end VCC produce starting resistor, when closing, metal-oxide-semiconductor Q1 has no progeny, and be 3 chargings of the 3rd capacitor C by auxiliary winding T1, make PWM power end VCC generation continuous voltage and be the PWM chip power supply.The sort circuit structure, it has control metal-oxide-semiconductor Q1 from the effect of turn-offing, and compares existing startup control circuit, and the utility model can not be in power-up state for a long time, has reduced the consumption to power, simultaneously, has also improved the useful life of complete machine.
As shown in Figure 1, the tie point of the first resistance R 1 and the second capacitor C 2 also is connected to the negative electrode of one second voltage-stabiliser tube DZ2, the plus earth of the second voltage-stabiliser tube DZ2.Under the effect of the second voltage-stabiliser tube DZ2 clamp voltage, can prevent that metal-oxide-semiconductor Q1 from damaging because of the overtension of grid.In the present embodiment, because the time constant of start-up circuit is τ=R1*C1, therefore, can further regulate by regulating the first resistance R 1 and the first capacitor C 1 delay time of start-up circuit, thereby adjust the work of LED driving power/intermittence state, further reduce the average standby power of LED driving power.The ac input end of described rectifier bridge DB1 also is connected to electrical network by a switch S 1, in the practical application, can be that the utility model powers on by Closing Switch S1.
The disclosed a kind of certainly shutoff startup control circuit that instead swashs driving power for LED of the utility model, by controlling the open-minded of metal-oxide-semiconductor Q1, make PWM power end VCC produce starting resistor, when closing, metal-oxide-semiconductor Q1 has no progeny, be the charging of the 3rd capacitor C 3 by auxiliary winding T1, make PWM power end VCC produce continuous voltage and be the PWM chip power supply.The sort circuit structure has control metal-oxide-semiconductor Q1 from the effect of turn-offing, and compares existing startup control circuit, and the utility model can not be in power-up state for a long time, has reduced the consumption to power, simultaneously, has also improved the useful life of complete machine.
The above is the utility model preferred embodiment, is not limited to the utility model, all modifications of making in technical scope of the present utility model, is equal to and replaces or improvement etc., all should be included in the scope that the utility model protects.

Claims (3)

1. one kind is used for the certainly shutoff startup control circuit that LED instead swashs driving power, it is characterized in that: it includes a rectifier bridge (DB1), first electric capacity (C1) of the dc output end of described rectifier bridge (DB1) by connecting successively, the first resistance (R1) and the second electric capacity (C2) ground connection, the tie point of the first resistance (R1) and the second electric capacity (C2) also is connected to the drain electrode of a metal-oxide-semiconductor (Q1) by a current-limiting resistance (R2), the tie point of the first resistance (R1) and the second electric capacity (C2) also is connected to the grid of metal-oxide-semiconductor (Q1), the source electrode of metal-oxide-semiconductor (Q1) is connected to the negative electrode of one first voltage-stabiliser tube (DZ1), the plus earth of the first voltage-stabiliser tube (DZ2), the source electrode of metal-oxide-semiconductor (Q1) also is connected to the anode of a fly-wheel diode (D2), the negative electrode of fly-wheel diode (D2) is by one the 3rd electric capacity (C3) ground connection, fly-wheel diode (D2) is PWM power end (VCC) with the tie point of the 3rd electric capacity (C3), this PWM power end (VCC) also is connected to the negative electrode of one first diode (D1), and the anode of this first diode (D1) is by secondary main winding (T1) ground connection of LED power transformer.
2. as claimed in claim 1 from turn-offing the startup control circuit, it is characterized in that: the tie point of described the first resistance (R1) and the second electric capacity (C2) also is connected to the negative electrode of one second voltage-stabiliser tube (DZ2), the plus earth of described the second voltage-stabiliser tube (DZ2).
3. as claimed in claim 1 from turn-offing the startup control circuit, it is characterized in that: the ac input end of described rectifier bridge (DB1) also is connected to electrical network by a switch (S1).
CN 201220481124 2012-09-20 2012-09-20 Self-switching-on-off starting control circuit used for LED flyback driving power supply Expired - Fee Related CN202906730U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220481124 CN202906730U (en) 2012-09-20 2012-09-20 Self-switching-on-off starting control circuit used for LED flyback driving power supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201220481124 CN202906730U (en) 2012-09-20 2012-09-20 Self-switching-on-off starting control circuit used for LED flyback driving power supply

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CN202906730U true CN202906730U (en) 2013-04-24

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105262326A (en) * 2015-11-16 2016-01-20 中国电子科技集团公司第四十三研究所 Starting control circuit for output linear voltage of switching power supply
CN110729883A (en) * 2019-10-25 2020-01-24 天津航空机电有限公司 Quick start circuit applied to flyback converter
CN110971111A (en) * 2019-11-14 2020-04-07 中电科仪器仪表(安徽)有限公司 Pulse width modulator auxiliary power supply circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105262326A (en) * 2015-11-16 2016-01-20 中国电子科技集团公司第四十三研究所 Starting control circuit for output linear voltage of switching power supply
CN110729883A (en) * 2019-10-25 2020-01-24 天津航空机电有限公司 Quick start circuit applied to flyback converter
CN110971111A (en) * 2019-11-14 2020-04-07 中电科仪器仪表(安徽)有限公司 Pulse width modulator auxiliary power supply circuit

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C14 Grant of patent or utility model
GR01 Patent grant
ASS Succession or assignment of patent right

Owner name: SHENZHEN PUGUANG ENERGY SAVING TECHNOLOGY CO., LTD

Free format text: FORMER OWNER: XIAO YINGMEI

Effective date: 20131113

C41 Transfer of patent application or patent right or utility model
TR01 Transfer of patent right

Effective date of registration: 20131113

Address after: 518000, No. 2, No. 401, industrial zone, deep Feng Road, Henggang street, Longgang District, Guangdong, Shenzhen

Patentee after: Shenzhen Puguang Energy Saving Technology Co., Ltd.

Address before: 518000, No. 1, deep Feng Road, Henggang Town, Longgang District, Guangdong, Shenzhen

Patentee before: Xiao Yingmei

LICC Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model
EE01 Entry into force of recordation of patent licensing contract

Assignee: Shenzhen Fengtaijing Optoelectronics Technology Co., Ltd.

Assignor: Shenzhen Puguang Energy Saving Technology Co., Ltd.

Contract record no.: 2014440020185

Denomination of utility model: Self-switching-on-off starting control circuit used for LED flyback driving power supply

Granted publication date: 20130424

License type: Exclusive License

Record date: 20140529

CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130424

Termination date: 20160920