CN103607109A - Power-supply soft-start circuit - Google Patents
Power-supply soft-start circuit Download PDFInfo
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- CN103607109A CN103607109A CN201310523345.0A CN201310523345A CN103607109A CN 103607109 A CN103607109 A CN 103607109A CN 201310523345 A CN201310523345 A CN 201310523345A CN 103607109 A CN103607109 A CN 103607109A
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Abstract
The invention discloses a power-supply soft-start circuit and belongs to the technical field of a power supply. The soft-start circuit includes a power-supply chip. The power-supply chip includes an output reference power-supply port, a feedback port and a compensation port and the like. The output reference power-supply port is connected to a base electrode of a triode and connected to a diode, a capacitor and an emitting electrode of the triode through a resistor. The other end of the diode is then connected to another resistor and another capacitor, a power-supply chip compensation port and a collecting electrode of a voltage feedback optocoupler. A collecting electrode of the triode, the two capacitors, the resistors, an emitting electrode of the voltage feedback optocoupler and the feedback port of the power-supply chip are grounded. The power-supply soft-start circuit is simple in structure, low in cost, easy to realize, convenient in calculation and capable of fundamentally solving a noise problem of a power-supply circuit, generated at the moment of starting up, an machine explosion problem of MOS or diode breakdown and a burning problem resulted from overly high load voltage and a machine breaking problem resulted from continuously fast plug-in and plug-out experiments.
Description
Technical field
The invention belongs to power circuit technical field, specifically, relate to a kind of soft startup circuit for power supply.
Background technology
In application, during without the power supply chip of frequency and duty ratio restriction, at booting moment, have the slight sound.Through measuring, find, at its FB feedback port of booting moment, have a upper punch voltage.This is because power supply chip itself is without soft start function, and there is no frequency and duty ratio restriction, at booting moment because the optocoupler being connected on its FB feedback port is not worked, feedback circuit is not set up, but chip internal detects the circuit of FB feedback port voltage and works, thereby make a voltge surge of FB port moment generation, according to the corresponding operating state of chip adjustment, now switching frequency changes very fast from booting moment to normal operation, thereby produce the slight sound, its circuit structure is shown in Figure 1.
Some power supply chips self are with at soft start function, thereby can avoid problems.But this type of power supply chip cost is higher, be not suitable for being widely used in the fiercer household appliances of price competition.For this reason, some production firm, in the design process of power circuit, adopts and on the FB of the power supply chip without frequency limitation feedback port, to increase the measures such as the ground capacity sound that suppresses to start shooting, and still, can not fundamentally thoroughly eliminate.
Therefore the circuit construction of electric power that, urgently occurs a kind of with low cost and sound of can effectively avoiding starting shooting.
Summary of the invention
The problem existing for above-mentioned prior art, the invention provides a kind of soft startup circuit for power supply, have the problem of the slight sound, and circuit cost is lower to solve existing power supply circuit at booting moment.
To achieve these goals, the technical solution used in the present invention is: comprise a power supply chip, this power supply chip comprises output reference power source port, feedback port, compensation port etc., output reference power source port is connected to a diode and an electric capacity by a resistance, the diode other end is connected to the collector electrode of another resistance and electric capacity, power supply chip compensation port and Voltage Feedback optocoupler, and the emitter of the Voltage Feedback optocoupler therewith feedback port of resistance capacitance and power supply chip is connected to ground;
A kind of soft startup circuit for power supply, it is characterized in that, comprise a power supply chip, this power supply chip comprises output reference power source port, feedback port, compensation port etc., output reference power source port is connected to the base stage of a triode, and by a resistance, be connected to the emitter of a diode and an electric capacity and this triode, the diode other end is connected to another resistance and electric capacity, the collector electrode of power supply chip compensation port and Voltage Feedback optocoupler, the collector electrode of triode, two electric capacity, resistance, the emitter of Voltage Feedback optocoupler and the feedback port of power supply chip are connected to ground,
Described soft startup circuit for power supply comprises power supply chip U1, PNP triode Q1, resistance R 1, resistance R 2, capacitor C 1, capacitor C 2, diode D1, optocoupler U2, the 8th pin of power supply chip U1 is connected to the base stage of PNP triode Q1, and by resistance R 1, be connected to the negative electrode of diode D1, the positive pole of capacitor C 1, the emitter of PNP triode Q1, the anodic bonding of diode D1 is to one end of resistance R 2, the positive pole of capacitor C 2, the 1st pin of power supply chip U1 and the collector electrode of optocoupler U2, the collector electrode of PNP triode Q1, the negative pole of capacitor C 1, the negative pole of capacitor C 2, the other end of resistance R 2, the 2nd pin of the emitter of optocoupler U2 and power supply chip U1 is connected to ground.
Described soft startup circuit for power supply can adopt various structures form to realize, and below sets forth three kinds of concrete structures: the first is to adopt a PNP triode to form described switching circuit, and its connected mode in circuit is shown in shown in accompanying drawing 1; The second is to adopt a depletion type P channel MOS tube, its connected mode in circuit is the tie point that the grid of depletion type P channel MOS tube is connected to the base stage of PNP triode, the source electrode of depletion type P channel MOS tube is connected to the tie point of the emitter of PNP triode, and the drain electrode of depletion type P channel MOS tube is connected to the tie point of the collector electrode of PNP triode; The third is to adopt a comparator and a controllable switch element, two inputs that its connected mode in circuit is comparator divide the tie point of the base stage that is clipped to PNP triode and the tie point of emitter, controllable switch element two ends are connected respectively to the tie point of emitter and the tie point of collector electrode of PNP triode, and comparator is control switch element conductive after its voltage difference being detected.
Compared with prior art, advantage of the present invention and good effect are: soft startup circuit for power supply of the present invention is simple in structure, with low cost, realize easily, convenience of calculation, can fundamentally solve the sound problem that power circuit booting moment produces, the aircraft bombing problem of MOS or diode breakdown, the too high problem that burns out causing of load voltage, the bad machine problem that fast insert-pull is tested continuously etc., guarantee that input voltage can bust, output voltage can transition, can reduce electromagnetic interference simultaneously, improve electromagnetism tolerance, be applicable to adopt and there is no frequency arbitrarily, in the switching power circuit that the power supply chip of the limitation functions such as duty ratio forms.
Read by reference to the accompanying drawings after the detailed description of embodiment of the present invention, it is clearer that the other features and advantages of the invention will become.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of power supply chip in existing switch power supply type electric car charger circuit;
Fig. 2 is the circuit theory diagrams of a kind of execution mode of soft startup circuit for power supply proposed by the invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the present invention are described in further detail.
The present invention adopts the switching power circuit that does not have the power supply chip of frequency and duty ratio restriction function to form to have soft start function in order to make at present, the sound occurring to solve power circuit booting moment, the aircraft bombing of MOS or diode breakdown, too high the burning out of causing of load voltage, the problems such as bad machine that fast insert-pull is tested continuously, between the reference power source port of power supply chip and compensation port, designed a soft startup circuit for power supply, the technical solution used in the present invention is: comprise a power supply chip, this power supply chip comprises output reference power source port, feedback port, compensation port etc., output reference power source port is connected to a diode and an electric capacity by a resistance, the diode other end is connected to another resistance and electric capacity, the collector electrode of power supply chip compensation port and Voltage Feedback optocoupler, the emitter of the Voltage Feedback optocoupler therewith feedback port of resistance capacitance and power supply chip is connected to ground,
A kind of soft startup circuit for power supply, it is characterized in that, comprise a power supply chip, this power supply chip comprises output reference power source port, feedback port, compensation port etc., output reference power source port is connected to the base stage of a triode, and by a resistance, be connected to the emitter of a diode and an electric capacity and this triode, the diode other end is connected to another resistance and electric capacity, the collector electrode of power supply chip compensation port and Voltage Feedback optocoupler, the collector electrode of triode, two electric capacity, resistance, the emitter of Voltage Feedback optocoupler and the feedback port of power supply chip are connected to ground,
Described soft startup circuit for power supply comprises power supply chip U1, PNP triode Q1, resistance R 1, resistance R 2, capacitor C 1, capacitor C 2, diode D1, optocoupler U2, the 8th pin of power supply chip U1 is connected to the base stage of PNP triode Q1, and by resistance R 1, be connected to the negative electrode of diode D1, the positive pole of capacitor C 1, the emitter of PNP triode Q1, the anodic bonding of diode D1 is to one end of resistance R 2, the positive pole of capacitor C 2, the 1st pin of power supply chip U1 and the collector electrode of optocoupler U2, the collector electrode of PNP triode Q1, the negative pole of capacitor C 1, the negative pole of capacitor C 2, the other end of resistance R 2, the 2nd pin of the emitter of optocoupler U2 and power supply chip U1 is connected to ground.
Described soft startup circuit for power supply can adopt various structures form to realize, and below sets forth three kinds of concrete structures: the first is to adopt a PNP triode to form described switching circuit, and its connected mode in circuit is shown in shown in accompanying drawing 1; The second is to adopt a depletion type P channel MOS tube, its connected mode in circuit is the tie point that the grid of depletion type P channel MOS tube is connected to the base stage of PNP triode, the source electrode of depletion type P channel MOS tube is connected to the tie point of the emitter of PNP triode, and the drain electrode of depletion type P channel MOS tube is connected to the tie point of the collector electrode of PNP triode; The third is to adopt a comparator and a controllable switch element, two inputs that its connected mode in circuit is comparator divide the tie point of the base stage that is clipped to PNP triode and the tie point of emitter, controllable switch element two ends are connected respectively to the tie point of emitter and the tie point of collector electrode of PNP triode, and comparator is control switch element conductive after its voltage difference being detected.
As shown in Figure 1, at power supply, rigidly connect when logical, voltage stabilizing circuit not yet enters operating state, and the foundation of switch power source output voltage needs the regular hour.Like this, lower output voltage, the error voltage that makes to be added in current comparator reverse input end is very high, and this will make chip during this period of time drive the pwm pulse that pin output duty cycle is very large.The overlong time of switching tube conducting, is easy to burn out because of overheated, so need to add soft starting circuit in circuit.
As shown in Figure 2, the soft starting circuit being formed by diode D1 and resistance R 1, capacitor C 1, PNP triode Q1, when just start, because the voltage in capacitor C 1 is zero, the error voltage that is added in current comparator reverse input end is zero, and driving pin can output low level.Along with the reference voltage pin of power supply chip is by the charging of 1 pair of capacitor C 1 of resistance R, the voltage of the 1st pin of power supply chip raises gradually, and the error voltage that is added in current comparator reverse input end is also raise gradually.Drive the duty ratio of the pwm pulse of pin output, in firm start-up phase, be restricted.When capacitor C 1 is charged to after certain voltage, diode D1 cut-off, soft start finishes.
As shown in Figure 2, reasonably select the parameter value of described resistance R 1 and charging capacitor C1, the rate of climb of the surge voltage that voltage on charging capacitor C1 is looked on not understanding produce than compensation port booting moment is fast, the surge voltage that just can make power supply at booting moment, compensation port be produced is moved low voltage to by diode, thereby guarantee that compensation port does not have the impact of large voltage, thereby solve the too high problem such as burn out causing of aircraft bombing, the load voltage of the sound, MOS or diode breakdown that power circuit booting moment occurs.
As shown in Figure 2, after shutdown, after the reference voltage of the 8th pin of power supply chip is zero, under the effect of the voltage in capacitor C 1, PNP triode Q1 conducting, capacitor C 1 is shorted to ground by the emitter and collector of triode Q1, can in time the voltage in capacitor C 1 be released like this, to meet the short time, again cannot realize the object of soft start in the situation of plug-in, solve the bad machine people problem of continuous fast insert-pull experiment.
When described switching circuit adopts depletion type P channel MOS tube to realize, its connected mode in circuit is the tie point that the grid of depletion type P channel MOS tube is connected to the base stage of PNP triode, the source electrode of depletion type P channel MOS tube is connected to the tie point of the emitter of PNP triode, the drain electrode of depletion type P channel MOS tube is connected to the tie point of the collector electrode of PNP triode, other circuit structures, with adopting PNP triode, do not repeat them here.
When described switching circuit adopts a comparator and a controllable switch element to realize, two inputs that its connected mode in circuit is comparator divide the tie point of the base stage that is clipped to PNP triode and the tie point of emitter, controllable switch element two ends are connected respectively to the tie point of emitter and the tie point of collector electrode of PNP triode, comparator is control switch element conductive after its voltage difference being detected, other circuit structures, with adopting PNP triode, do not repeat them here.
Certainly, described switching circuit equally also can adopt other various structures forms to realize, and the present invention is not limited in above-mentioned giving an example.
In the present invention, described power supply chip U1 can adopt the single-ended PWM controller generally adopting in current switching power circuit to realize, and such as the power supply chip of UC3842 series, the present invention's contrast does not specifically limit.
Should be understood that; above-mentioned explanation is not limitation of the present invention; the present invention is also not limited in above-mentioned giving an example, and the variation that those skilled in the art have done in essential scope of the present invention, remodeling, interpolation or replacement, also should belong to protection scope of the present invention.
Claims (1)
1. a soft startup circuit for power supply, it is characterized in that, comprise a power supply chip, this power supply chip comprises output reference power source port, feedback port, compensation port etc., output reference power source port is connected to the base stage of a triode, and by a resistance, be connected to the emitter of a diode and an electric capacity and this triode, the diode other end is connected to another resistance and electric capacity, the collector electrode of power supply chip compensation port and Voltage Feedback optocoupler, the collector electrode of triode, two electric capacity, resistance, the emitter of Voltage Feedback optocoupler and the feedback port of power supply chip are connected to ground,
Described soft startup circuit for power supply comprises power supply chip U1, PNP triode Q1, resistance R 1, resistance R 2, capacitor C 1, capacitor C 2, diode D1, optocoupler U2, the 8th pin of power supply chip U1 is connected to the base stage of PNP triode Q1, and by resistance R 1, be connected to the negative electrode of diode D1, the positive pole of capacitor C 1, the emitter of PNP triode Q1, the anodic bonding of diode D1 is to one end of resistance R 2, the positive pole of capacitor C 2, the 1st pin of power supply chip U1 and the collector electrode of optocoupler U2, the collector electrode of PNP triode Q1, the negative pole of capacitor C 1, the negative pole of capacitor C 2, the other end of resistance R 2, the 2nd pin of the emitter of optocoupler U2 and power supply chip U1 is connected to ground,
PNP triode Q1 in described soft startup circuit for power supply can be used depletion type P channel MOS tube to replace, its connected mode in circuit is the tie point that the grid of depletion type P channel MOS tube is connected to the base stage of PNP triode, the source electrode of depletion type P channel MOS tube is connected to the tie point of the emitter of PNP triode, and the drain electrode of depletion type P channel MOS tube is connected to the tie point of the collector electrode of PNP triode;
PNP triode Q1 in described soft startup circuit for power supply can be used a comparator and a controllable switch element to replace, two inputs that its connected mode in circuit is comparator divide the tie point of the base stage that is clipped to PNP triode and the tie point of emitter, controllable switch element two ends are connected respectively to the tie point of emitter and the tie point of collector electrode of PNP triode, and comparator is control switch element conductive after its voltage difference being detected.
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| CN201310523345.0A CN103607109A (en) | 2013-10-30 | 2013-10-30 | Power-supply soft-start circuit |
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| CN201310523345.0A CN103607109A (en) | 2013-10-30 | 2013-10-30 | Power-supply soft-start circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104079156A (en) * | 2014-05-26 | 2014-10-01 | 徐州市恒源电器有限公司 | Soft starting circuit of power source |
| CN104883045A (en) * | 2015-05-28 | 2015-09-02 | 株洲变流技术国家工程研究中心有限公司 | Switch power supply soft start circuit and switch power supply soft start method |
| CN108712068A (en) * | 2018-08-17 | 2018-10-26 | 广州金升阳科技有限公司 | A kind of compensation circuit |
| CN109194109A (en) * | 2018-09-27 | 2019-01-11 | 广州金升阳科技有限公司 | A kind of compensation circuit |
| CN114710018A (en) * | 2022-06-06 | 2022-07-05 | 广东东菱电源科技有限公司 | PFC protection circuit for fast startup and shutdown |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104079156A (en) * | 2014-05-26 | 2014-10-01 | 徐州市恒源电器有限公司 | Soft starting circuit of power source |
| CN104883045A (en) * | 2015-05-28 | 2015-09-02 | 株洲变流技术国家工程研究中心有限公司 | Switch power supply soft start circuit and switch power supply soft start method |
| CN108712068A (en) * | 2018-08-17 | 2018-10-26 | 广州金升阳科技有限公司 | A kind of compensation circuit |
| CN108712068B (en) * | 2018-08-17 | 2024-02-13 | 广州金升阳科技有限公司 | Compensation circuit |
| CN109194109A (en) * | 2018-09-27 | 2019-01-11 | 广州金升阳科技有限公司 | A kind of compensation circuit |
| CN114710018A (en) * | 2022-06-06 | 2022-07-05 | 广东东菱电源科技有限公司 | PFC protection circuit for fast startup and shutdown |
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Application publication date: 20140226 |