CN103580466B - A kind of voltage-controlled type soft-start circuit with stagnant ring function - Google Patents
A kind of voltage-controlled type soft-start circuit with stagnant ring function Download PDFInfo
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- CN103580466B CN103580466B CN201310546714.8A CN201310546714A CN103580466B CN 103580466 B CN103580466 B CN 103580466B CN 201310546714 A CN201310546714 A CN 201310546714A CN 103580466 B CN103580466 B CN 103580466B
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Abstract
The invention discloses a kind of voltage-controlled type soft-start circuit with stagnant ring function, comprising: comparator N1, diode V1, diode V2, triode V3, resistance R1-resistance R7.Resistance R1 connects with resistance R2 and forms bleeder circuit, when input voltage be established to gradually make the 2IN+ pin voltage of comparator N1 be greater than the 2IN-pin voltage of comparator N1 time, there is high level in the 2OUT of comparator N1, thus makes SS be high level; When the 2OUT pin of comparator N1 is high level, resistance R3, resistance R4, diode V1 start to devote oneself to work, if now there is input voltage fluctuation within limits, still can ensure that SS signal is high level, maintenance work.Circuit structure of the present invention is simple, can resist the input voltage fluctuation of certain limit, play good delay startup effect in circuit.
Description
Technical field
The present invention relates to a kind of voltage-controlled type soft-start circuit, particularly a kind of voltage-controlled type soft-start circuit with stagnant ring function.
Background technology
The current rectifying and wave filtering circuit of DC power supply, usually containing larger storage capacitor, can produce larger impulse current at powered on moment, likely damages switch contact, rectifier diode etc. in circuit, and causes interference to electrical network.
Voltage-controlled type soft-start circuit general at present, comprise: comparator N1, resistance R1, resistance R2, resistance R4, resistance R1 connects with resistance R2, comparator N1 is sent to after input voltage dividing potential drop, after comparing with reference voltage, the 2OUT pin of comparator N1 exports as high level, and this level is for controlling unlatching and the shutoff of power supply.This soft-start circuit can not resist input voltage fluctuation within the specific limits, meet the 2OUT pin output high level of comparator N1 at input voltage after, if reducing appears in input voltage, through dividing potential drop and after comparing with the reference voltage of the 2IN-pin of comparator N1, formation level overturns, there is low level, cause input voltage to be cut off.
Summary of the invention
The object of the present invention is to provide a kind of voltage-controlled type soft-start circuit with stagnant ring function, solve the problem that input voltage may be caused cut-off when input voltage fluctuates within the specific limits.
There is a voltage-controlled type soft-start circuit for stagnant ring function, comprising: comparator N1, resistance R1, resistance R2, resistance R4, also comprise: diode V1, diode V2, triode V3, resistance R3, resistance R5, resistance R6, resistance R7.
One end and the input voltage signal Vin of resistance R1 hold wire to be connected, and the resistance R1 other end is connected with one end of resistance R2 and one end wire of resistance R3 respectively; The resistance R2 other end is connected with GND wire; The resistance R3 other end is connected with the 2IN+ pin wire of resistance R4 one end and comparator N1 respectively; The other end of resistance R4 is connected with the anode wire of diode V1; The negative terminal of diode V1 is connected with the 2OUT pin wire of comparator N1; The 2IN-pin of comparator N1 is connected with 5.1V reference signal end wire; The 2OUT pin of comparator N1 is connected with the 1IN-pin wire of comparator N1; The 1IN+ pin of comparator N1 is connected with one end wire of 5.1V reference signal end and resistance R5 respectively; The other end of resistance R5 is connected with the anode wire of diode V2; The negative terminal of diode V2 is connected with the 1OUT pin wire of comparator N1, and the 1OUT pin of comparator N1 is connected with one end of resistance R7, one end of resistance R6, the base lead of triode V3 respectively; The other end of resistance R6 is connected with 15V power reference end wire; Triode V3 emitter is connected with 15V voltage reference end wire; Triode V3 collector electrode is connected with SS signal end wire; The power supply pin of comparator N1 is connected with VC signal end wire; The grounding leg of comparator N1 is connected with GND wire.
Input signal Vin is through resistance R1, the 2IN+ pin of comparator N1 is sent to after resistance R2 series connection dividing potential drop, after the 2IN+ pin level of comparator N1 is greater than the 2IN-pin reference signal of comparator N1, the 2OUT pin of comparator N1 exports high level, if this level is greater than the reference level of the 1IN+ pin of comparator N1, by after resistance R5 and diode V2 serial Feedback between 1OUT pin and 1IN+ pin, the 1OUT pin output low level of comparator N1, triode V3 base level is made to become low level from the high level obtained after pull-up resistor R6 parallel resistance R7 connects power supply, SS signal becomes low level by high level, the delay startup of realizing circuit.After there is high level in the 2OUT pin of comparator N1, resistance R3, resistance R4 and diode V1 start working, realize resistance R3, resistance R4, diode V1 connect after in parallel with resistance R2, jointly dividing potential drop is carried out to input signal Vin, realizes the stagnant ring function of dividing potential drop of input voltage.
The present invention has the opposing input current excessive feature causing components and parts damage, can input the electrical safety of limit components and parts by available protecting.And this circuit has the larger feature of opposing input voltage fluctuation simultaneously, user can sets itself resistance R1-R4 resistance as required, thus change the size of starting resistor, overcome input voltage fluctuation larger time cause cut off exchange input phenomenon, this circuit is suitable for the delay startup part of various Switching Power Supply.
Accompanying drawing explanation
A kind of structural representation with the voltage-controlled type soft-start circuit of stagnant ring function of Fig. 1.
Embodiment
There is a voltage-controlled type soft-start circuit for stagnant ring function, comprising: comparator N1, resistance R1, resistance R2, resistance R4, also comprise: diode V1, diode V2, triode V3, resistance R3, resistance R5, resistance R6, resistance R7.
One end and the input voltage signal Vin of resistance R1 hold wire to be connected, and the resistance R1 other end is connected with one end of resistance R2 and one end wire of resistance R3 respectively; The resistance R2 other end is connected with GND wire; The resistance R3 other end is connected with the 2IN+ pin wire of resistance R4 one end and comparator N1 respectively; The other end of resistance R4 is connected with the anode wire of diode V1; The negative terminal of diode V1 is connected with the 2OUT pin wire of comparator N1; The 2IN-pin of comparator N1 is connected with 5.1V reference signal end wire; The 2OUT pin of comparator N1 is connected with the 1IN-pin wire of comparator N1; The 1IN+ pin of comparator N1 is connected with one end wire of 5.1V reference signal end and resistance R5 respectively; The other end of resistance R5 is connected with the anode wire of diode V2; The negative terminal of diode V2 is connected with the 1OUT pin wire of comparator N1, and the 1OUT pin of comparator N1 is connected with one end of resistance R7, one end of resistance R6, the base lead of triode V3 respectively; The other end of resistance R6 is connected with 15V power reference end wire; Triode V3 emitter is connected with 15V voltage reference end wire; Triode V3 collector electrode is connected with SS signal end wire; The power supply pin of comparator N1 is connected with VC signal end wire; The grounding leg of comparator N1 is connected with GND wire.
Input signal Vin is through resistance R1, the 2IN+ pin of comparator N1 is sent to after resistance R2 series connection dividing potential drop, after the 2IN+ pin level of comparator N1 is greater than the 2IN-pin reference signal of comparator N1, the 2OUT pin of comparator N1 exports high level, if this level is greater than the reference level of the 1IN+ pin of comparator N1, by after resistance R5 and diode V2 serial Feedback between 1OUT pin and 1IN+ pin, the 1OUT pin output low level of comparator N1, triode V3 base level is made to become low level from the high level obtained after pull-up resistor R6 parallel resistance R7 connects power supply, SS signal becomes low level by high level, the delay startup of realizing circuit.After there is high level in the 2OUT pin of comparator N1, resistance R3, resistance R4 and diode V1 start working, realize resistance R3, resistance R4, diode V1 connect after in parallel with resistance R2, jointly dividing potential drop is carried out to input signal Vin, realizes the stagnant ring function of dividing potential drop of input voltage.
Claims (1)
1. there is a voltage-controlled type soft-start circuit for stagnant ring function, comprising: comparator N1, resistance R1, resistance R2, resistance R4, characterized by further comprising: diode V1, diode V2, triode V3, resistance R3, resistance R5, resistance R6, resistance R7;
One end and the input voltage signal Vin of resistance R1 hold wire to be connected, and the resistance R1 other end is connected with one end of resistance R2 and one end wire of resistance R3 respectively; The resistance R2 other end is connected with GND wire; The resistance R3 other end is connected with the 2IN+ pin wire of resistance R4 one end and comparator N1 respectively; The other end of resistance R4 is connected with the anode wire of diode V1; The negative terminal of diode V1 is connected with the 2OUT pin wire of comparator N1; The 2IN-pin of comparator N1 is connected with 5.1V reference signal end wire; The 2OUT pin of comparator N1 is connected with the 1IN-pin wire of comparator N1; The 1IN+ pin of comparator N1 is connected with one end wire of 5.1V reference signal end and resistance R5 respectively; The other end of resistance R5 is connected with the anode wire of diode V2; The negative terminal of diode V2 is connected with the 1OUT pin wire of comparator N1, and the 1OUT pin of comparator N1 is connected with one end of resistance R7, one end of resistance R6, the base lead of triode V3 respectively; The other end of resistance R6 is connected with 15V power reference end wire; Triode V3 emitter is connected with 15V voltage reference end wire; Triode V3 collector electrode is connected with SS signal end wire; The power supply pin of comparator N1 is connected with VC signal end wire; The grounding leg of comparator N1 is connected with GND wire;
Input signal Vin is through resistance R1, the 2IN+ pin of comparator N1 is sent to after resistance R2 series connection dividing potential drop, after the 2IN+ pin level of comparator N1 is greater than the 2IN-pin reference signal of comparator N1, the 2OUT pin of comparator N1 exports high level, if this level is greater than the reference level of the 1IN+ pin of comparator N1, by after resistance R5 and diode V2 serial Feedback between 1OUT pin and 1IN+ pin, the 1OUT pin output low level of comparator N1, triode V3 base level is made to become low level from the high level obtained after pull-up resistor R6 parallel resistance R7 connects power supply, SS signal becomes low level by high level, the delay startup of realizing circuit, after there is high level in the 2OUT pin of comparator N1, resistance R3, resistance R4 and diode V1 start working, realize resistance R3, resistance R4, diode V1 connect after in parallel with resistance R2, jointly dividing potential drop is carried out to input signal Vin, realizes the stagnant ring function of dividing potential drop of input voltage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310546714.8A CN103580466B (en) | 2013-11-07 | 2013-11-07 | A kind of voltage-controlled type soft-start circuit with stagnant ring function |
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| CN201310546714.8A CN103580466B (en) | 2013-11-07 | 2013-11-07 | A kind of voltage-controlled type soft-start circuit with stagnant ring function |
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| CN103580466B true CN103580466B (en) | 2016-03-30 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201928186U (en) * | 2011-01-17 | 2011-08-10 | 南通三信塑胶装备科技有限公司 | Sliding frequency soft startup circuit applied to electromagnetic induction heating power supply |
| CN202503436U (en) * | 2011-12-31 | 2012-10-24 | 珠海拓普智能电气股份有限公司 | Explosion-proof and intrinsically safe type direct-current voltage-stabilized power supply delay start-up circuit based on TPS5430 chip |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8742741B2 (en) * | 2011-03-30 | 2014-06-03 | Fairchild Semiconductor Corporation | Apparatus and methods of soft-start in a hysteretic power converter |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201928186U (en) * | 2011-01-17 | 2011-08-10 | 南通三信塑胶装备科技有限公司 | Sliding frequency soft startup circuit applied to electromagnetic induction heating power supply |
| CN202503436U (en) * | 2011-12-31 | 2012-10-24 | 珠海拓普智能电气股份有限公司 | Explosion-proof and intrinsically safe type direct-current voltage-stabilized power supply delay start-up circuit based on TPS5430 chip |
Non-Patent Citations (2)
| Title |
|---|
| "有源电力滤波器在分布式发电系统中的应用";姜春霞等;《电力系统保护与控制》;20081116;第36卷(第22期);50-53 * |
| "滞环比较器及其在电力电子中的应用";艾永乐等;《汕头大学学报（自然科学版）》;20081130;第23卷(第4期);71-75 * |
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