CN206559229U - A kind of switching regulator soft-start circuit - Google Patents

A kind of switching regulator soft-start circuit Download PDF

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Publication number
CN206559229U
CN206559229U CN201621302474.2U CN201621302474U CN206559229U CN 206559229 U CN206559229 U CN 206559229U CN 201621302474 U CN201621302474 U CN 201621302474U CN 206559229 U CN206559229 U CN 206559229U
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CN
China
Prior art keywords
circuit
driver
oxide
semiconductor
metal
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CN201621302474.2U
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Chinese (zh)
Inventor
李祥忠
曹利伟
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深圳市能隙科技有限公司
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Priority to CN201621302474.2U priority Critical patent/CN206559229U/en
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Publication of CN206559229U publication Critical patent/CN206559229U/en

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Abstract

The utility model discloses a kind of switching regulator soft-start circuit, including slow starting control circuit, filter unit, absorptive unit and driver element;The slow starting control circuit produces high-frequency, the pulse wave signal of low duty ratio controls the driver element constantly conducting and disconnection, the filter capacitor charging for making feeder ear intermittent to the filter unit, the backward voltage that the driver element turned on and disconnected moment and produces is limited by the absorptive unit simultaneously, and in filter capacitor charging process, current limliting is carried out to the electric current in circuit by the filter unit and the driver element is protected in filtering, in the filter capacitor charging complete, the slow starting control circuit exports high level, it is held on driver element, functional circuit is powered by feeder ear.The problem of the utility model solves delay startup inrush current shock, reduces the instantaneous power consumption of metal-oxide-semiconductor, also limit the backward voltage produced during metal-oxide-semiconductor shut-off, metal-oxide-semiconductor is worked in safety zone.

Description

A kind of switching regulator soft-start circuit

Technical field

The utility model is related to electronic technology field, more particularly to a kind of switching regulator soft-start circuit.

Background technology

In order to suppress interference signal, filter capacitor can be all used in current various electronic circuits, due to Large Copacity filtered electrical The presence of appearance, at upper electric initial stage, capacitance short-circuit can produce great surge current in input circuit, to power supply and electricity consumption Circuit causes very big impact, causes the unstable of electronic circuit, reduces the reliability of circuit, when serious, or even can cause line Road plate or electronic component burn, it is therefore necessary to increase soft-start circuit in electronic circuit.

Current soft-start circuit generally uses resistance or NTC(Negative temperature system thermal resistor)To limit upper electric initial stage Electric current, in normal work, starts resistance by the short circuit such as relay or IGCT, reduces power attenuation during normal work, But such a mode is present that cost is high, bulky shortcoming.

There are the electric current that upper electric initial stage was limited using the linear operating region of metal-oxide-semiconductor, in normal work, MOS simultaneously Pipe is fully on, reduces conduction loss, but in delay startup, because metal-oxide-semiconductor works in the range of linearity, conduction voltage drop is big, easily Metal-oxide-semiconductor is caused instantaneously to overheat and damage.

Thus prior art could be improved and improve.

Utility model content

In view of in place of above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide a kind of switching regulator delay startup electricity Road, it is possible to resolve the problem of instantaneous power consumption of metal-oxide-semiconductor is excessive in delay startup.

In order to achieve the above object, the utility model takes following technical scheme:

A kind of switching regulator soft-start circuit, is connected with feeder ear and functional circuit, and the switching regulator soft-start circuit includes Slow starting control circuit, filter unit, absorptive unit and driver element;The slow starting control circuit produces high-frequency, low accounted for The pulse wave signal of empty ratio controls the continuous conducting of driver element and disconnection, makes feeder ear intermittent single to the filtering The filter capacitor charging of member, while limiting the reverse electricity that the driver element turned on and disconnected moment and produces by the absorptive unit Pressure, and in filter capacitor charging process, current limliting is carried out to the electric current in circuit by the filter unit and filtering protection is described Driver element, in the filter capacitor charging complete, the slow starting control circuit exports high level, keeps driver element Conducting, is powered by feeder ear to functional circuit.

Further, the filter unit includes filter capacitor and inductance, and one end of the filter capacitor passes through the electricity Sense connects the absorptive unit and driver element, also linkage function circuit, the other end connection absorptive unit of the filter capacitor, Feeder ear and functional circuit.

Further, the absorptive unit includes first resistor, the second electric capacity and diode, and the negative pole of the diode connects Connect one end of first resistor and one end of the second electric capacity, the other end connection feeder ear of the first resistor, the one of the second electric capacity End, the other end and functional circuit of the filter capacitor, the positive pole of the diode connect one end of the inductance, also connect institute State driver element.

Further, the driver element includes metal-oxide-semiconductor, second resistance and 3rd resistor, and the grid of the metal-oxide-semiconductor passes through The second resistance connects slow starting control circuit, is grounded also by the 3rd resistor, and the drain electrode connection of the metal-oxide-semiconductor is described One end of the positive pole of diode and the inductance, the source ground of the metal-oxide-semiconductor.

Specifically, the metal-oxide-semiconductor is N-channel MOS pipe.

Specifically, the inductance value of the inductance is 1-10 μ H.

The high frequency switch type soft starting circuit provided compared to prior art, the utility model, including delay startup control electricity Road, filter unit, absorptive unit and driver element;By the switching pulse charging modes of high frequency low duty ratio, slow open is solved The problem of dynamic inrush current shock, the instantaneous power consumption of metal-oxide-semiconductor is reduced, reliability is improved, it is ensured that the safety of metal-oxide-semiconductor; By using absorptive unit, the backward voltage produced during metal-oxide-semiconductor shut-off is limited, metal-oxide-semiconductor is worked in safety zone;It is simultaneously whole Individual circuit structure is simple, has the advantages that high efficiency, reliable, low cost.

Brief description of the drawings

Fig. 1 is the structured flowchart of switching regulator soft-start circuit provided by the utility model.

Fig. 2 is the schematic diagram of switching regulator soft-start circuit provided by the utility model.

Embodiment

The utility model provides a kind of switching regulator soft-start circuit, to make the purpose of this utility model, technical scheme and effect Fruit is clearer, clear and definite, and the utility model is further described the embodiment that develops simultaneously referring to the drawings.It should be appreciated that this The specific embodiment of place description only to explain the utility model, is not used to limit the utility model.

Fig. 1 and Fig. 2 are referred to, the switching regulator soft-start circuit that the present invention is provided is high frequency switch type soft-start circuit, with Feeder ear and functional circuit connection, including slow starting control circuit 10, filter unit 11, absorptive unit 12 and driver element 13, The slow starting control circuit 10 is sequentially connected with the filter unit 11, absorptive unit 12 and driver element 13.

Specifically, the delay startup control unit 10 is used to send in the filter capacitor C1 charging processes of filter unit 11 The pulse wave signal of high-frequency, low duty ratio, high level is exported in filter capacitor C1 charging completes;The filter unit 11 is used In current limliting and filtering;The absorptive unit 12 is used to limit the driver element conducting and disconnects the backward voltage of moment generation; The driver element 13 is used to suppress surge current.

When it is implemented, the slow starting control circuit 10 produces high-frequency, the pulse wave signal control institute of low duty ratio Driver element 13 constantly conducting and disconnection are stated, the intermittent filter capacitor C1 to the filter unit 11 of feeder ear is filled Electricity, while the backward voltage that the driver element 13 turned on and disconnected moment generation is limited by the absorptive unit 12, and in filter In ripple electric capacity C1 charging processes, current limliting is carried out to the electric current in circuit by the filter unit 11 and the filtering protection driving is single Member 13, in the filter capacitor charging complete, the slow starting control circuit 10 exports high level, keeps driver element 13 Conducting, is powered by feeder ear to functional circuit.

Referring to Fig. 2, it is Large Copacity that the filter unit 11, which includes filter capacitor C1 and inductance L1, the filter capacitor C1, Filter capacitor, the inductance L1 be used for limit in charging process, the electric current in each switch periods is less using inductance value Inductance, it is specific from the inductance that inductance value is 1-10 μ H.

When it is implemented, one end of the filter capacitor C1 passes through the inductance L1 connections absorptive unit 12 and driving Unit 13, specifically connects the diode D1 of the absorptive unit 12 positive pole and the metal-oxide-semiconductor Q1 of the driver element 13 drain electrode, Also linkage function circuit, other end connection absorptive unit 12, feeder ear and the functional circuit of the filter capacitor C1, are specifically connected Second electric capacity C2 of the absorptive unit 12 one end and first resistor R1 one end.Please continue to refer to Fig. 2, the absorptive unit It is absorption resistance including first resistor R1, the second electric capacity C2 and diode D1, the first resistor R1, the second electric capacity C2 is High-frequency ceramic electric capacity, the diode D1 be fast recovery diode, reverse recovery time short the characteristics of good with switching characteristic, The first resistor R1, the second electric capacity C2 and diode D1 constitute high-frequency absorption loop.

When it is implemented, the negative pole of the diode D1 connect respectively first resistor R1 one end and the second electric capacity C2 one End, other end connection feeder ear, the second electric capacity C2 other end, the other end of the filter capacitor C1 of the first resistor R1 And functional circuit, the positive pole connection inductance L1 of diode D1 one end, the driver element 13 is also connected, is specifically connected Connect metal-oxide-semiconductor Q1 drain electrode.

If metal-oxide-semiconductor Q1 disconnects, it is accumulated in energy in stray inductance and is charged by metal-oxide-semiconductor Q1 parasitic capacitance, metal-oxide-semiconductor Q1 electricity Pressure rises.When its voltage rises to the second electric capacity C2 voltage, diode D1 conductings, metal-oxide-semiconductor Q1 voltages are embedded by diode D1 Position, about 1V or so.The energy accumulated in stray inductance also charges to the second electric capacity C2.During metal-oxide-semiconductor Q1 is connected, the second electric capacity C2 is discharged by first resistor R1, so that the backward voltage of the moment limitation metal-oxide-semiconductor Q1 in metal-oxide-semiconductor Q1 off and on.

Please continue to refer to Fig. 2, the driver element 13 includes metal-oxide-semiconductor Q1, second resistance R2 and 3rd resistor R3, and described the Two resistance R2 and R3 shield, and the metal-oxide-semiconductor Q1 is used for the surge current for suppressing to produce upper electric initial stage, specially N ditches Road metal-oxide-semiconductor.

When it is implemented, the grid of the metal-oxide-semiconductor Q1 is by the second resistance R2 connections slow starting control circuit 10, It is grounded by the 3rd resistor R3, the drain electrode connection diode D1 of metal-oxide-semiconductor positive pole, the one of the inductance L1 End, the source ground of the metal-oxide-semiconductor.

In order to be better understood from the utility model, detailed is made to the technical solution of the utility model below in conjunction with Fig. 1 and Fig. 2 Explanation:

In feeder ear powered on moment, filter capacitor C1 instantaneous short circuits, the power supply of feeder ear is all carried in metal-oxide-semiconductor Q1 source In pole and drain electrode, and inductance L1, the electric current in inductance L1 limiting circuits is no more than metal-oxide-semiconductor Q1 peak-peak, now delays and opens Dynamic control circuit 10 sends high-frequency, the impulse wave of low duty ratio, and metal-oxide-semiconductor Q1 is driven by second resistance R2, it is intermittent to Metal-oxide-semiconductor Q1 grid and source electrode is powered, and changes metal-oxide-semiconductor Q1 gate source voltage VGS, it is operated in linear zone, suppresses surge electricity Stream, simultaneously because power supply process is intermittent, reduces metal-oxide-semiconductor Q1 instantaneous power consumption.Hereafter, with filter capacitor C1 Voltage lifting step by step so that the VDS of metal-oxide-semiconductor is gradually decreased, is finally operated in conducting area.Afterwards, filter capacitor C1 charging completes When, the slow starting control circuit 10 no longer exports high-frequency, the pulse wave signal of low duty ratio, but exports high level, makes Metal-oxide-semiconductor Q1 is held on, and functional circuit is powered by feeder ear, and delay startup is completed.

Meanwhile, during metal-oxide-semiconductor Q1 shut-off, the energy during shut-off is absorbed by absorptive unit 12, limitation metal-oxide-semiconductor Q1's Backward voltage, it is to avoid metal-oxide-semiconductor Q1 excessive pressure damages.

In summary, the switching regulator soft-start circuit that the utility model is provided is filled by the switching pulse of high frequency low duty ratio Electrically, the problem of solving delay startup inrush current shock, reduces the instantaneous power consumption of metal-oxide-semiconductor, improves reliability, also protects The safety of metal-oxide-semiconductor is demonstrate,proved;By using absorptive unit, the backward voltage produced during metal-oxide-semiconductor shut-off is limited, metal-oxide-semiconductor is worked In safety zone.

Present invention employs a small number of conventional electronic components, make the characteristics of power supply has high efficiency, reliable, low cost, On the premise of increasing seldom cost, the performance of power supply is greatly improved, the market competitiveness is added.

It is understood that for those of ordinary skills, can according to the technical solution of the utility model and The design of its utility model is subject to equivalent substitution or change, and all these changes or replacement should all belong to appended by the utility model Scope of the claims.

Claims (6)

1. a kind of switching regulator soft-start circuit, is connected with feeder ear and functional circuit, it is characterised in that the switching regulator delay startup Circuit includes slow starting control circuit, filter unit, absorptive unit and driver element;The slow starting control circuit produces high frequency Rate, the pulse wave signal of low duty ratio control the driver element constantly conducting and disconnection, make feeder ear intermittent to institute The filter capacitor charging of filter unit is stated, while limiting the driver element by the absorptive unit turns on and disconnect moment generation Backward voltage, and in filter capacitor charging process, current limliting and filtering are carried out to the electric current in circuit by the filter unit Protect the driver element;In the filter capacitor charging complete, the slow starting control circuit exports high level, makes driving Unit is held on, and functional circuit is powered by feeder ear.
2. switching regulator soft-start circuit according to claim 1, it is characterised in that the filter unit includes filter capacitor And inductance, one end of the filter capacitor is by absorptive unit and driver element described in the inductance connection, and also linkage function is electric Road, other end connection absorptive unit, feeder ear and the functional circuit of the filter capacitor.
3. switching regulator soft-start circuit according to claim 2, it is characterised in that the absorptive unit includes the first electricity Resistance, the second electric capacity and diode, one end and one end of the second electric capacity of the negative pole connection first resistor of the diode, described the Other end connection feeder ear, the other end of the second electric capacity, the other end and functional circuit of the filter capacitor of one resistance, it is described The positive pole of diode connects one end of the inductance, also connects the driver element.
4. switching regulator soft-start circuit according to claim 3, it is characterised in that the driver element includes metal-oxide-semiconductor, the Two resistance and 3rd resistor, the grid of the metal-oxide-semiconductor connect slow starting control circuit by the second resistance, also by described 3rd resistor is grounded, the positive pole of the drain electrode connection diode of the metal-oxide-semiconductor and one end of the inductance, the metal-oxide-semiconductor Source ground.
5. switching regulator soft-start circuit according to claim 4, it is characterised in that the metal-oxide-semiconductor is N channel MOS tubes.
6. the switching regulator soft-start circuit according to claim 2-5 any one, it is characterised in that the inductance of the inductance Measure as 1-10 μ H.
CN201621302474.2U 2016-11-30 2016-11-30 A kind of switching regulator soft-start circuit CN206559229U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201621302474.2U CN206559229U (en) 2016-11-30 2016-11-30 A kind of switching regulator soft-start circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201621302474.2U CN206559229U (en) 2016-11-30 2016-11-30 A kind of switching regulator soft-start circuit

Publications (1)

Publication Number Publication Date
CN206559229U true CN206559229U (en) 2017-10-13

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108258677A (en) * 2018-01-02 2018-07-06 珠海格力电器股份有限公司 A kind of battery charge controller, charging system and its control method
CN108964433A (en) * 2018-06-28 2018-12-07 北京航天自动控制研究所 A kind of overall process Inrush current restraining generalization device and control method based on PWM closed-loop control
CN110086246A (en) * 2019-04-30 2019-08-02 普联技术有限公司 A kind of anti-voltage overshoot circuit and duplicate supply system for duplicate supply system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108258677A (en) * 2018-01-02 2018-07-06 珠海格力电器股份有限公司 A kind of battery charge controller, charging system and its control method
CN108964433A (en) * 2018-06-28 2018-12-07 北京航天自动控制研究所 A kind of overall process Inrush current restraining generalization device and control method based on PWM closed-loop control
CN110086246A (en) * 2019-04-30 2019-08-02 普联技术有限公司 A kind of anti-voltage overshoot circuit and duplicate supply system for duplicate supply system

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