CN206922645U - A kind of soft starting circuit of power switch - Google Patents
A kind of soft starting circuit of power switch Download PDFInfo
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- CN206922645U CN206922645U CN201621480047.3U CN201621480047U CN206922645U CN 206922645 U CN206922645 U CN 206922645U CN 201621480047 U CN201621480047 U CN 201621480047U CN 206922645 U CN206922645 U CN 206922645U
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- electric capacity
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- 239000004065 semiconductor Substances 0.000 abstract description 18
- 230000006872 improvement Effects 0.000 abstract description 3
- 239000003990 capacitor Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 6
- 102100039435 C-X-C motif chemokine 17 Human genes 0.000 description 4
- 101000889048 Homo sapiens C-X-C motif chemokine 17 Proteins 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007600 charging Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000012421 spiking Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Abstract
The utility model discloses a kind of soft starting circuit of power switch, including insulating power supply unit, opto-coupled feedback driver element and the PWM chip being sequentially connected, the soft starting circuit of the power switch also include：Primary soft start unit, secondary soft start unit and electric capacity discharge cell；The output end of the primary soft start unit is connected with the FB pins of the PWM chip；The input of the secondary soft start unit is connected with the output end of the insulating power supply unit, and output end is connected with the control terminal of the opto-coupled feedback driver element；The input of the electric capacity discharge cell is connected with the output end of the insulating power supply unit.The utility model is a kind of soft starting circuit of power switch, improves the reliability of the metal-oxide-semiconductor occurred in start-up phase and shut-down-phase and secondary commutation diode.Particularly in the power supply of High voltage output, the utility model can use the reliability of limited cost improvement power supply.
Description
Technical field
Field of switch power is the utility model is related to, more particularly to a kind of soft starting circuit of power switch.
Background technology
At present, in the market inverse-excitation type switch power-supply has been widely used in all trades and professions, is current most widely used electricity
One of source.But because its inner workings and materials'use etc., on startup, power supply enters continuous state, transformer
Middle dump energy is not fully transmitted to secondary but feeds back to primary, and these energy cause very strong point on primary metal-oxide-semiconductor
Peak.Switching Power Supply can typically increase absorption RCD circuits and be absorbed, but this absorbing circuit needs to consider temperature rise and MOS
Manage it is pressure-resistant between equilibrium relation, and typically the spike of booting moment can not effectively be absorbed, during so as to cause start
Metal-oxide-semiconductor peak value is higher than peak value during normal work, the metal-oxide-semiconductor for forcing engineer to have to select more high standard.
Utility model content
The purpose of this utility model is to overcome weak point of the prior art, there is provided a kind of soft start electricity of power switch
Road.
The purpose of this utility model is achieved through the following technical solutions：
A kind of soft starting circuit of power switch, including insulating power supply unit, the opto-coupled feedback driver element being sequentially connected
And PWM chip, the soft starting circuit of the power switch also include：Primary soft start unit, secondary soft start unit and electric capacity
Discharge cell；The output end of the primary soft start unit is connected with the FB pins of the PWM chip；The secondary soft start list
The input of member is connected with the output end of the insulating power supply unit, output end and the control terminal of the opto-coupled feedback driver element
Connection；The input of the electric capacity discharge cell is connected with the output end of the insulating power supply unit.
As further preferred scheme, the primary soft start unit includes the first power supply, first resistor, second
Resistance, the first electric capacity and the first triode；
First power supply is connected with the first resistor and the second resistance successively, the first resistor and institute
The common port for stating second resistance is connected with the base stage of first triode；The grounded collector of first triode, transmitting
Pole is connected with the FB pins of the PWM chip；
First electric capacity and the both ends of the second resistance are connected in parallel.
As further preferred scheme, the secondary soft start unit includes the second power supply, the first diode, the
One comparator, the second electric capacity, 3rd resistor, the 4th resistance, the 5th resistance and the 6th resistance；
One end of second electric capacity is connected with the output end of the insulating power supply unit, and the other end is successively with the described 5th
Resistance is grounded after being connected with the 6th resistant series, the common port and described first of the 5th resistance and the 6th resistance
The negative pole inverting input connection of comparator；
Second power supply is grounded after being connected with the 3rd resistor, the 4th resistant series, the 3rd electricity
The common port of resistance and the 4th resistance is connected with the positive pole inverting input of the first comparator；
The output end of the first comparator is connected with the negative electrode of first diode, the anode of first diode
Output end as the secondary soft start unit；
Second power supply is also connected with the VCC ends of the first comparator.
As further preferred scheme, the electric capacity discharge cell includes the second triode, the 7th resistance, the 8th resistance
And second comparator；
Input of the emitter stage of second triode as electric capacity discharge cell, colelctor electrode and the 7th resistance
One end connects, the other end ground connection of the 7th resistance；The base stage of second triode is through the 8th resistance and described the
The output end connection of two comparators.
The advantages of the utility model is compared to prior art and have the beneficial effect that：
1st, the utility model is a kind of soft starting circuit of power switch, improves and goes out in start-up phase and shut-down-phase
Existing metal-oxide-semiconductor and the reliability of secondary commutation diode.Particularly in the power supply of High voltage output, the utility model can be with having
The reliability of the cost improvement power supply of limit.
2nd, the soft starting circuit of power switch of the present utility model is provided with primary soft start unit, can be used for solving start
When MOS and diode peak too high problem of startup stage loop when not setting up.
3rd, the utility model is a kind of soft starting circuit of power switch, provided with secondary soft start unit, can be used for solving
When certainly starting shooting, secondary loop has been set up, but it is stable not enough when metal-oxide-semiconductor and the too high problem of diode peak.
4th, the soft starting circuit of power switch of the present utility model is provided with electric capacity discharge cell, can be used for solving switch
Under the conditions of machine, instant power-down etc. the problem of secondary soft start element failure.
5th, the component of the soft starting circuit of power switch of the present utility model is less so that cost is relatively low, and may be used also
To reduce the peak value of metal-oxide-semiconductor peak value and secondary commutation diode, circuit is improved in the special of start, shutdown or high-speed switch machine
Under the conditions of stability.
Brief description of the drawings
Fig. 1 is the theory diagram of the soft starting circuit of the power switch of the utility model embodiment；
Fig. 2 is the partial circuit diagram of the soft starting circuit of the power switch of the utility model embodiment；
Fig. 3 is the circuit diagram of primary soft start unit of the present utility model；
Fig. 4 is the circuit diagram of secondary soft start unit of the present utility model；
Fig. 5 is the circuit diagram of electric capacity discharge cell of the present utility model.
Embodiment
For the ease of understanding the utility model, the utility model is more fully retouched below with reference to relevant drawings
State.Better embodiment of the present utility model is given in accompanying drawing.But the utility model can come in many different forms
Realize, however it is not limited to embodiments described herein.On the contrary, the purpose for providing these embodiments is to make to this practicality newly
The more thorough and comprehensive that the disclosure of type understands.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element
Or there may also be element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
For illustrative purposes only, it is unique embodiment to be not offered as " right side " and similar statement.
Unless otherwise defined, all of technologies and scientific terms used here by the article is led with belonging to technology of the present utility model
The implication that the technical staff in domain is generally understood that is identical.It is simply in term used in the description of the present utility model herein
The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term as used herein " and/or " bag
Include the arbitrary and all combination of the Listed Items of one or more correlations.
Referring to Fig. 1, a kind of soft starting circuit 10 of power switch, including insulating power supply unit 1, the optocoupler being sequentially connected
Feedback driver element 2 and PWM chip 3, the soft starting circuit 10 of the power switch also include：Primary soft start unit 4, secondary
Soft start unit 5 and electric capacity discharge cell 6；The output end of the primary soft start unit 4 and the FB pins of the PWM chip 3
Connection；The input of the secondary soft start unit 5 is connected with the output end of the insulating power supply unit 1, output end with it is described
The control terminal connection of opto-coupled feedback driver element 2；The input of the electric capacity discharge cell 6 and the insulating power supply unit 1
Output end connects.
Wherein, the primary soft start unit 4 is used to solve the due to voltage spikes that opto-coupled feedback driver element 2 occurs during start
Problem.The secondary soft start unit 5 is used for after solving start, but opto-coupled feedback driving when secondary loop is stable not enough is single
The due to voltage spikes problem that member 2 occurs.It is secondary under the conditions of instant power-down etc. when the electric capacity discharge cell 6 is used to solve switching on and shutting down
The problem of soft start unit 5 fails.
It is noted that the primary soft start unit 4 includes the first power supply VCC1, first resistor R363, second
Resistance R364, the first electric capacity C323 and the first triode Q313.
Further, the first power supply VCC1 successively with the first resistor R363 and the second resistance R364
Connection, the first resistor R363 and the second resistance R364 common port connect with the base stage of the first triode Q313
Connect；The grounded collector of the first triode Q313, emitter stage are connected with the FB pins of the PWM chip 3；First electricity
The both ends for holding C323 and the second resistance R364 are connected in parallel.
Further, the secondary soft start unit 5 compares including the second power supply, the first diode D308, first
Device, the second electric capacity C418,3rd resistor R439, the 4th resistance R440, the 5th resistance R448 and the 6th resistance R441.To be illustrated
It is that the second power supply is 12V.
One end of the second electric capacity C418 is connected with the output end of the insulating power supply unit 1, the other end successively with institute
State after the 5th resistance R448 and the 6th resistance R441 is connected in series and be grounded, the 5th resistance R448 and the 6th resistance
R441 common port is connected with the negative pole inverting input IN- of the first comparator；
Second power supply is grounded after being connected in series with the 3rd resistor R439, the 4th resistance R440, institute
3rd resistor R439 and the 4th resistance R440 common port is stated with the positive pole inverting input IN+ of the first comparator to connect
Connect.
The output end of the first comparator is connected with the negative electrode of the first diode D308, first diode
Output end of the D308 anode as the secondary soft start unit 5；Second power supply also with the first comparator
VCC ends connection.
Further, the electric capacity discharge cell 6 includes the second triode Q312, the 7th resistance R444, the 8th resistance
R447 and the second comparator U514B.
Input of the emitter stage of the second triode Q312 as electric capacity discharge cell 6, colelctor electrode and the described 7th
Resistance R444 one end connection, the other end ground connection of the 7th resistance R444；The base stage of the second triode Q312 is through institute
The output end that the 8th resistance R447 is stated with the second comparator U514B is connected.
It should also be noted that the opto-coupled feedback driver element 2 includes metal-oxide-semiconductor Q302, the 9th resistance R309, the two or two pole
Pipe D306 and the tenth resistance R311.
The D poles of the metal-oxide-semiconductor Q302 are connected with an input of the insulating power supply unit, and G poles are through successively with described
It is connected after nine resistance R309, the tenth resistance R311 series connection with the GATE pins of the PWM chip 3；S poles are grounded.Described
Two diode D306 are in parallel with the both ends of the 9th resistance R309.
The opto-coupled feedback driver element 2 also includes feedback control circuit, and the feedback control circuit includes optocoupler unit,
The negative electrode of the secondary light emitting diode of the optocoupler unit is also as the control terminal of the opto-coupled feedback driver element 2 and described time
The output end connection of level soft start unit 5, i.e., the negative electrode of the secondary light emitting diode of described optocoupler unit and the one or two pole
Pipe D308 anode connection.The output end of the optocoupler unit primary part is connected with the FB pins of the PWM chip 3.
It should also be noted that insulating power supply unit includes transformer and is connected in parallel with the secondary output end of the transformer
The first electrochemical capacitor C310 and the second electrochemical capacitor C312.Insulating power supply unit also includes secondary commutation diode D304, institute
State commutation diode D304 anode to be connected with a secondary output end of the transformer, negative electrode is defeated as insulating power supply unit
Go out end.
The course of work：
Referring to Fig. 3, Fig. 3 is the circuit theory diagrams of primary soft start unit of the present utility model.Wherein, in the increase of FB pin
After network by components such as the first triode Q313, can solve spiking problems during start, particularly opto-coupled feedback is driven
The few tens of cycles of metal-oxide-semiconductor backward voltage in moving cell has effect effect.After power initiation, PWM chip U303 5 pin are defeated
Go out square-wave signal, but because now the first power supply VCC1 gave for the first electric capacity C323 charging stages, the first triode Q313 is led
Logical, the FB pin of PWM chip are clamped to low level.PWM chip is stopped after several drive waveforms are exported.Now first supply
Power supply VCC1 also stops power supply, and when start-up circuit continues to start, PWM chip exports several drive waveforms and stops work again
Make, now, two electrochemical capacitors of secondary output can be slowly charged several cycles, and voltage slowly rises.In this actuation cycle
And the first electric capacity C323 voltage is increased, until the first triode Q313 is no longer turned on, circuit initially enters normal work shape
State.
The FB pin of PWM chip are the pins for controlling metal-oxide-semiconductor Q302 dutycycles, and the FB pin of PWM chip are by the first triode
Q313 is constantly dragged down, and driving dutycycle can be forced not increase immediately, and be constantly stopped.Transformer inductance electric current can be compared with nothing
The electric current of soft starting circuit is small, when metal-oxide-semiconductor turns off, the electric current by largest current change be 0 when rate of change can also reduce, coupling
Closing the electric current of leakage inductance and metal-oxide-semiconductor junction capacity will reduce, and metal-oxide-semiconductor peak voltage can also reduce caused by leakage inductance, therefore
Metal-oxide-semiconductor due to voltage spikes can reduce, and realize metal-oxide-semiconductor soft start.
The circuit can not only realize the soft start of metal-oxide-semiconductor, can also realize the soft start of secondary commutation diode, avoid
This two power conversion apparatus voltage overshoots caused by start.Because continuous repeated priming, system is avoided in continuous mode
Long-term work, therefore diode reverse spike can be improved.
Primary soft start unit has certain inhibitory action to several due to voltage spikes of booting moment, once on capacitance voltage
When being raised to cut-off state, function is just lost, can not clamper FB pin waveform, therefore also need to the progress of another soft starting circuit again
Ensuing work.
Referring to Fig. 4, Fig. 4 show secondary soft start unit, in system start-up phase, primary part passes through transformer coupling
Close secondary and give output two electrochemical capacitor (the first electrochemical capacitor C310 and the second electrochemical capacitor C312) chargings, secondary voltage
Begin to ramp up, dV/dt can be formed on the second electric capacity C418, because capacitance characteristic is separated by direct communication characteristic, the voltage of this change
Can flow through the second electric capacity C418, and by the 5th resistance R448 and the 6th resistance R441 first comparator negative pole anti-phase input
Form voltage on the IN- of end, the base pressure now formed with the positive pole inverting input IN+ of first comparator relatively after, by the
The output end output low level of one comparator, drags down VFB pin, forces optocoupler sub-section to turn on.The primary controlled part of optocoupler is same
When turn on, drag down the FB pins of primary PWM chip, form feedback.FB pins can drag down GATE pin output duty cycles, and then shape
Into soft start.
Fig. 4 is secondary soft start unit, because the power supply of the second comparator needs main system to power, in the dozens of that main system starts
In cycle, VCC undertensions, the second comparator can not work.Secondary loop is not also set up.After few tens of cycles,
The circuit ability normal work.Therefore in this few tens of cycles, secondary soft start unit can not improve voltage peak, by first
Level soft start limitation due to voltage spikes.
Two kinds of soft starting circuits of only Fig. 3 and Fig. 4 be combined with each other, and could ensure that metal-oxide-semiconductor peak value drops in whole startup stage
It is low, really play a part of soft start.
But only Fig. 3 and Fig. 4 soft starting circuit can only solve the stress excessive problem of booting moment.Can not solve to switch
Stress problem during machine, after power supply power-fail, PWM chip has been stopped, and if now loading without consumed energy, secondary two
Still in store certain voltage in individual electrochemical capacitor (the first electrochemical capacitor C310 and the second electrochemical capacitor C312), PWM chip
Startup stage can still be entered, and now do not form effective dV/di on the second electric capacity C418；In second electric capacity C418
The AC compounent changed greatly is cannot flow through, this soft starting circuit will fail.
Therefore, we add discharge circuit using another comparator.After power supply is stopped, discharge circuit meeting
Open, during power supply normal work, discharge circuit can close, and so can effectively solve the overshooting problem caused by switching on and shutting down.
Referring to Fig. 5, when power down occurs in Vout2,6 pin benchmark of the second comparator are constant, the 5 pin electricity of the second comparator
Pressure drop is low, now, the 7 pin output low level of the second comparator, the second triode Q312 conductings, the 7 pin continuation of the second comparator
Electric discharge.When Vout2 voltage is normal, 5 pin voltages of the second comparator need to be higher than 6 pin voltages, and the second triode Q312 will not
Conducting.Electric current will not pass through the 7th resistance R444.Secondary electrolysis electric capacity discharging function so can be both met, it is ensured that soft start electricity
Road will not fail, it is also ensured that will not be because of the 7th resistance R444 consumed energies during normal work.It ensure that electrical resistance simultaneously
The stability of energy, it also ensure that power standby power consumption rises and efficiency will not decline because increase circuit.
Embodiment described above only expresses several embodiments of the present utility model, and it describes more specific and detailed
Carefully, but the limitation to the utility model patent scope therefore can not be interpreted as.It should be pointed out that for the general of this area
For logical technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these are all
Belong to the scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (4)
1. a kind of soft starting circuit of power switch, including be sequentially connected insulating power supply unit, opto-coupled feedback driver element and
PWM chip, it is characterised in that the soft starting circuit of the power switch also includes：Primary soft start unit, secondary soft start list
Member and electric capacity discharge cell；The output end of the primary soft start unit is connected with the FB pins of the PWM chip；The secondary
The input of soft start unit is connected with the output end of the insulating power supply unit, output end and the opto-coupled feedback driver element
Control terminal connection；The input of the electric capacity discharge cell is connected with the output end of the insulating power supply unit.
2. the soft starting circuit of power switch according to claim 1, it is characterised in that the primary soft start unit bag
Include the first power supply, first resistor, second resistance, the first electric capacity and the first triode；
First power supply is connected with the first resistor and the second resistance successively, the first resistor and described
The common port of two resistance is connected with the base stage of first triode；The grounded collector of first triode, emitter stage with
The FB pins connection of the PWM chip；
First electric capacity and the both ends of the second resistance are connected in parallel.
3. the soft starting circuit of power switch according to claim 1, it is characterised in that the secondary soft start unit bag
Include the second power supply, the first diode, first comparator, the second electric capacity, 3rd resistor, the 4th resistance, the 5th resistance and
Six resistance；
One end of second electric capacity is connected with the output end of the insulating power supply unit, the other end successively with the 5th resistance
It is grounded after being connected with the 6th resistant series, the common port of the 5th resistance and the 6th resistance is compared with described first
The negative pole inverting input connection of device；
Second power supply is grounded after being connected with the 3rd resistor, the 4th resistant series, the 3rd resistor and
The common port of 4th resistance is connected with the positive pole inverting input of the first comparator；
The output end of the first comparator is connected with the negative electrode of first diode, the anode conduct of first diode
The output end of the secondary soft start unit；
Second power supply is also connected with the VCC ends of the first comparator.
4. the soft starting circuit of power switch according to claim 1, it is characterised in that the electric capacity discharge cell includes
Second triode, the 7th resistance, the 8th resistance and the second comparator；
Input of the emitter stage of second triode as electric capacity discharge cell, one end of colelctor electrode and the 7th resistance
Connection, the other end ground connection of the 7th resistance；The base stage of second triode compares through the 8th resistance and described second
Output end compared with device connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621480047.3U CN206922645U (en) | 2016-12-30 | 2016-12-30 | A kind of soft starting circuit of power switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621480047.3U CN206922645U (en) | 2016-12-30 | 2016-12-30 | A kind of soft starting circuit of power switch |
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| CN206922645U true CN206922645U (en) | 2018-01-23 |
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| CN201621480047.3U Expired - Fee Related CN206922645U (en) | 2016-12-30 | 2016-12-30 | A kind of soft starting circuit of power switch |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108909918A (en) * | 2018-05-29 | 2018-11-30 | 沈江 | A kind of control circuit and its control method of balance car |
| CN109067158A (en) * | 2018-08-21 | 2018-12-21 | 北方电子研究院安徽有限公司 | A kind of elimination DC power supply starting overshoot protection circuit |
| CN109687700A (en) * | 2019-02-27 | 2019-04-26 | 山东超越数控电子股份有限公司 | A kind of DC-DC converter restores soft starting circuit and starting method fastly |
| CN111725985A (en) * | 2020-07-11 | 2020-09-29 | 青岛鼎信通讯股份有限公司 | Soft start control circuit applied to electric power product |
| 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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2016
- 2016-12-30 CN CN201621480047.3U patent/CN206922645U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108909918A (en) * | 2018-05-29 | 2018-11-30 | 沈江 | A kind of control circuit and its control method of balance car |
| CN109067158A (en) * | 2018-08-21 | 2018-12-21 | 北方电子研究院安徽有限公司 | A kind of elimination DC power supply starting overshoot protection circuit |
| CN109067158B (en) * | 2018-08-21 | 2024-01-26 | 北方电子研究院安徽有限公司 | Protection circuit for eliminating starting overshoot of direct-current power supply |
| CN109687700A (en) * | 2019-02-27 | 2019-04-26 | 山东超越数控电子股份有限公司 | A kind of DC-DC converter restores soft starting circuit and starting method fastly |
| CN111725985A (en) * | 2020-07-11 | 2020-09-29 | 青岛鼎信通讯股份有限公司 | Soft start control circuit applied to electric power product |
| 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 |
| CN114710018B (en) * | 2022-06-06 | 2022-09-02 | 广东东菱电源科技有限公司 | PFC (power factor correction) protection circuit for quick startup and shutdown |
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