CN209516926U - A kind of soft startup of electric power protection circuit - Google Patents
A kind of soft startup of electric power protection circuit Download PDFInfo
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- CN209516926U CN209516926U CN201920435590.9U CN201920435590U CN209516926U CN 209516926 U CN209516926 U CN 209516926U CN 201920435590 U CN201920435590 U CN 201920435590U CN 209516926 U CN209516926 U CN 209516926U
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Abstract
The utility model relates to power technique fields, and particularly a kind of soft startup of electric power protects circuit.The utility model discloses a kind of soft startup of electric power to protect circuit; including delay circuit, current-limiting circuit and switching circuit; it is arranged between power input and power output end after the current-limiting circuit and switching circuit are in parallel; the output end of input the termination current-limiting circuit and switching circuit of the delay circuit; the control terminal of the output termination switching circuit of the delay circuit, is connected for control switch circuit delay.The utility model can reduce interference of the power surge to late-class circuit, realize the purpose for improving life of product and stability, and have the advantages of simple structure and easy realization.
Description
Technical field
The utility model belongs to power technique fields, protects circuit more particularly to a kind of soft startup of electric power.
Background technique
The input circuit of Switching Power Supply generallys use the form of rectification power-up capacitor filter, if power supply protects electricity without soft start
Road is powered moment in input circuit, since the initial voltage of filter capacitor is the instantaneous punching that zero can be charged rapidly, and form very big
Electric current, also referred to as surge current are hit, which is far longer than stable state input current, is easy to generate system late-class circuit dry
It disturbs, system anti-fatigue ability is poor, ultimately causes system destruction, reduced lifetime.
Summary of the invention
The purpose of this utility model is to provide a kind of soft startup of electric power protection circuits to solve above-mentioned technology
Problem.
To achieve the above object, the technical solution adopted in the utility model are as follows: a kind of soft startup of electric power protection circuit, including
Setting is in power input and electricity after delay circuit, current-limiting circuit and switching circuit, the current-limiting circuit and switching circuit are in parallel
Between source output terminal, the output end of input the termination current-limiting circuit and switching circuit of the delay circuit, the delay circuit
The control terminal of output termination switching circuit, is connected for control switch circuit delay.
Further, the switching circuit is realized using PMOS tube Q1, and the source electrode of the PMOS tube Q1 connects power input
End, the drain electrode of the PMOS tube Q1 connect power output end, and the grid of the PMOS tube Q1 connects the output end of delay circuit.
Further, the current-limiting circuit includes resistance R3, and the resistance R3 is in parallel with PMOS tube Q1.
Further, the delay circuit includes the first termination electricity of capacitor EC1 and NPN triode Q2, the capacitor EC1
Source output terminal, the second end ground connection of capacitor EC1, the base stage of the NPN triode Q2 meet the first end of capacitor EC1, the NPN tri-
The collector of pole pipe Q2 connects the grid of PMOS tube Q1, the emitter ground connection of the NPN triode Q2.
It further, further include zener diode D1, the base series zener diode D1 of the NPN triode Q2 connects
The first end of capacitor EC1.
It further, further include resistance R2 and R4, the resistance R4 is serially connected in the collector and PMOS tube of NPN triode Q2
Between the grid of Q1, the resistance R2 is connect between the source electrode and grid of PMOS tube Q1.
It further, further include capacitor C3, the capacitor C3 connects between the source electrode and grid of PMOS tube Q1.
It further, further include that resistance R1 and capacitor C1, the resistance R1 and capacitor C1 series connection are followed by PMOS tube Q1's
Between source electrode and drain electrode.
It further, further include resistance R7 and capacitor C4, the power input is sequentially connected in series capacitor C4 and resistance R7 connects
Ground.
The advantageous effects of the utility model:
The utility model realizes soft startup of electric power, reduces interference of the power surge to late-class circuit, realizes and improve product
The purpose in service life and stability, and circuit structure is simple, it is easy to accomplish, it is at low cost.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly introduced, it should be apparent that, the accompanying drawings in the following description is only some implementations of the utility model
Example, for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the circuit diagram of the utility model specific embodiment.
Specific embodiment
To further illustrate each embodiment, the utility model is provided with attached drawing.These attached drawings are in the utility model discloses
A part of appearance mainly to illustrate embodiment, and can cooperate the associated description of specification former come the running for explaining embodiment
Reason.Cooperation refers to these contents, and those of ordinary skill in the art will be understood that other possible embodiments and sheet are practical new
The advantages of type.Component in figure is not necessarily to scale, and similar component symbol is conventionally used to indicate similar component.
Now in conjunction with the drawings and specific embodiments, the present invention will be further described.
As shown in Figure 1, a kind of soft startup of electric power protects circuit, including delay circuit, current-limiting circuit and switching circuit, it is described
It is arranged between power input VCC IN and power output end VCC OUT after current-limiting circuit and switching circuit are in parallel, it is described to prolong
When circuit input termination current-limiting circuit and switching circuit output end, the delay circuit output termination switching circuit control
End processed is connected for control switch circuit delay, and the conducting of switching circuit is short-circuit by current-limiting circuit.
Specifically, the switching circuit is realized using PMOS tube Q1, the source electrode of the PMOS tube Q1 connects power input
VCC IN, the drain electrode of the PMOS tube Q1 meet power output end VCC OUT, and the grid of the PMOS tube Q1 connects the defeated of delay circuit
Outlet.
In this specific embodiment, the model IRFR5305TRPBF of PMOS tube Q1 certainly in other embodiments, can also
To be realized using the PMOS tube of other models or other switching tubes, this is that those skilled in the art can realize easily, no
It describes in detail again.
In this specific embodiment, the current-limiting circuit includes resistance R3, and the resistance R3 is in parallel with PMOS tube Q1, structure letter
It is single, it is at low cost, certainly, in other embodiments, it can also be realized using existing various current-limiting circuits, this is this field skill
What art personnel can realize easily, no longer describe in detail.
In this specific embodiment, the delay circuit includes capacitor EC1 and NPN triode Q2, and the first of the capacitor EC1
The second end of termination power output end VCC OUT, capacitor EC1 is grounded, and the base stage of the NPN triode Q2 connects the of capacitor EC1
One end, the collector (output end of delay circuit) of the NPN triode Q2 connect the grid of PMOS tube Q1, the NPN triode
The emitter of Q2 is grounded, and the base series resistor R8 of the NPN triode Q2 connects the emitter of NPN triode Q2, the present embodiment
Delay circuit have the advantages of simple structure and easy realization.Certainly, in other embodiments, existing other delay circuits can also be used
It realizes, this is that those skilled in the art can realize easily, no longer describe in detail.
In this specific embodiment, capacitor EC1 is preferably electrolytic capacitor, and capacity is big, and price is low.
It further, further include zener diode D1, the base stage of the NPN triode Q2 is sequentially connected in series zener diode D1
The first end of capacitor EC1 is connect with resistance R6.Zener diode D1 is used to that the time that NPN triode Q2 is begun to turn on to be arranged, also phase
The time is begun to turn on when PMOS tube Q1 is then arranged.
In this specific embodiment, zener diode D1 is 12V voltage-stabiliser tube, when voltage is more than 12V on electrolytic capacitor EC1
NPN triode Q2 and PMOS tube Q1 are begun to turn on, and certainly, in other embodiments, the pressure stabilizing value of zener diode D1 can root
It is selected according to actual needs, this is that those skilled in the art can realize easily, is no longer described in detail.
Further include resistance R2 and R4 in this specific embodiment, the resistance R4 be serially connected in the collector of NPN triode Q2 with
Between the grid of PMOS tube Q1, the resistance R2 is connect between the source electrode and grid of PMOS tube Q1.Resistance R2 and R4 composition partial pressure
Circuit ensures that the VGS voltage of PMOS tube Q1 without departing from the requirement of metal-oxide-semiconductor VGS voltage specification, improves reliability.
It further include capacitor C3 in this specific embodiment, the capacitor C3 connects between the source electrode and grid of PMOS tube Q1.Electricity
Holding C3 is used to prevent concussion between the grid and source electrode of PMOS tube Q1 from causing PMOS tube Q1 job insecurity.
It further include that resistance R1 and capacitor C1, the resistance R1 and capacitor C1 series connection are followed by PMOS in this specific embodiment
Between the source electrode and drain electrode of pipe Q1.Resistance R1 and capacitor C1 can prevent the peak voltage between the source electrode and drain electrode of PMOS tube Q1
The normal phase is more than that parameter specification causes PMOS tube Q1 fever to influence the service life.
It further include that resistance R7 and capacitor C4, the power input VCC IN are sequentially connected in series capacitor in this specific embodiment
C4 and resistance R7 ground connection.For eliminating common mode interference, reduce EMI influences resistance R7 and capacitor C4.
The course of work:
When just powering on, the first end voltage of electrolytic capacitor EC1 is 0, and the base voltage of NPN triode Q2 is 0, NPN at this time
Triode Q2 is not turned on, and PMOS tube Q1 is in off state.Electric current charges to electrolytic capacitor C1 by resistance R3, because of resistance R3
Presence keep charging current unlikely too big, reduce system power impact.
When the first end voltage of electrolytic capacitor EC1 rises to 12V, NPN triode Q2 is connected, and then PMOS tube Q1 is connected,
By resistance R3 short circuit, electric current flows to power output end VCC OUT from PMOS tube Q1, and then flows to system for PMOS tube Q1 conducting at this time
Rear class realizes the purpose that electric current will not be too small when working normally.
The utility model realizes soft startup of electric power, reduces interference of the power surge to late-class circuit, realizes and improve product
The purpose in service life and stability, and circuit structure is simple, it is easy to accomplish, it is at low cost.
Although specifically showing and describing the utility model in conjunction with preferred embodiment, those skilled in the art is answered
This is understood, in the spirit and scope for not departing from the utility model defined by the appended claims, in form and details
On the utility model can be made a variety of changes, be the protection scope of the utility model.
Claims (9)
1. a kind of soft startup of electric power protects circuit, it is characterised in that: described including delay circuit, current-limiting circuit and switching circuit
It is arranged between power input and power output end after current-limiting circuit and switching circuit are in parallel, the input terminal of the delay circuit
Connect the output end of current-limiting circuit and switching circuit, the control terminal of the output termination switching circuit of the delay circuit, for controlling
Switching circuit Delayed conducting.
2. soft startup of electric power according to claim 1 protects circuit, it is characterised in that: the switching circuit uses PMOS tube
Q1 realizes that the source electrode of the PMOS tube Q1 connects power input, the drain electrode of the PMOS tube Q1 connects power output end, described
The grid of PMOS tube Q1 connects the output end of delay circuit.
3. soft startup of electric power according to claim 2 protects circuit, it is characterised in that: the current-limiting circuit includes resistance
R3, the resistance R3 are in parallel with PMOS tube Q1.
4. soft startup of electric power according to claim 2 protects circuit, it is characterised in that: the delay circuit includes capacitor
The first termination power output end of EC1 and NPN triode Q2, the capacitor EC1, the second end ground connection of capacitor EC1, the NPN
The base stage of triode Q2 connects the first end of capacitor EC1, and the collector of the NPN triode Q2 connects the grid of PMOS tube Q1, described
The emitter of NPN triode Q2 is grounded.
5. soft startup of electric power according to claim 4 protects circuit, it is characterised in that: further include zener diode D1, institute
The base series zener diode D1 for stating NPN triode Q2 connects the first end of capacitor EC1.
6. soft startup of electric power according to claim 4 protects circuit, it is characterised in that: it further include resistance R2 and R4, it is described
Resistance R4 is serially connected between the collector of NPN triode Q2 and the grid of PMOS tube Q1, and the resistance R2 connects PMOS tube Q1's
Between source electrode and grid.
7. soft startup of electric power according to claim 4 protects circuit, it is characterised in that: further include capacitor C3, the capacitor
C3 connects between the source electrode and grid of PMOS tube Q1.
8. soft startup of electric power according to claim 4 protects circuit, it is characterised in that: it further include resistance R1 and capacitor C1,
The resistance R1 and capacitor C1 series connection is followed by between the source electrode and drain electrode of PMOS tube Q1.
9. soft startup of electric power according to claim 4 protects circuit, it is characterised in that: it further include resistance R7 and capacitor C4,
The power input is sequentially connected in series capacitor C4 and resistance R7 ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920435590.9U CN209516926U (en) | 2019-04-02 | 2019-04-02 | A kind of soft startup of electric power protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920435590.9U CN209516926U (en) | 2019-04-02 | 2019-04-02 | A kind of soft startup of electric power protection circuit |
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| Publication Number | Publication Date |
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| CN209516926U true CN209516926U (en) | 2019-10-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920435590.9U Active CN209516926U (en) | 2019-04-02 | 2019-04-02 | A kind of soft startup of electric power protection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113242138A (en) * | 2021-07-14 | 2021-08-10 | 杭州杰为科技有限公司 | Simple PD circuit and PD equipment power supply method |
| CN113937743A (en) * | 2021-10-18 | 2022-01-14 | 深圳英恒电子有限公司 | Impulse current suppression circuit |
-
2019
- 2019-04-02 CN CN201920435590.9U patent/CN209516926U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113242138A (en) * | 2021-07-14 | 2021-08-10 | 杭州杰为科技有限公司 | Simple PD circuit and PD equipment power supply method |
| CN113937743A (en) * | 2021-10-18 | 2022-01-14 | 深圳英恒电子有限公司 | Impulse current suppression circuit |
| CN113937743B (en) * | 2021-10-18 | 2024-05-14 | 深圳英恒电子有限公司 | Impact current suppression circuit |
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