CN207150163U - Surge current suppression circuit module - Google Patents
Surge current suppression circuit module Download PDFInfo
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- CN207150163U CN207150163U CN201721039602.3U CN201721039602U CN207150163U CN 207150163 U CN207150163 U CN 207150163U CN 201721039602 U CN201721039602 U CN 201721039602U CN 207150163 U CN207150163 U CN 207150163U
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- output end
- supply input
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- power output
- programmable controller
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Abstract
The utility model discloses a kind of surge current suppression circuit module, including DC supply input and DC power output end；DC supply input is connected with FET source electrode, and FET drain is connected by thermistor with DC power output end；Fet gate is connected by resistance with transistor collector, and transistor base is connected with the control output end of programmable controller first, transistor emitter ground connection；Relay is connected between DC supply input and output end, relay normally open contact one end is connected the other end with power input and is connected with DC power output end；Magnet coil one end of relay is connected the other end with DC supply input and is connected with the control output end of programmable controller second.The utility model advantage is the intelligent control that Inrush current restraining is realized by programmable controller, the shortcomings that effectively overcoming pure hardware circuit in the prior art, and control method is simple, is easily modified, and integrated level is high, and stability is good.
Description
Technical field
Protection circuit module is the utility model is related to, more particularly, to surge current suppression circuit module.
Background technology
When high-power electronic device starts, because electronic equipment internal there are larger filter capacitor, these are limited by
Caused by the capacitive attribute of filter capacitor, powered on moment will produce very big charging current.Furthermore due to the power of electronic equipment
Larger, the input service electric current of electronic equipment is also larger, and momentary charge electric current is superimposed with input service electric current, can be produced bigger
Starting current, i.e. surge current.Surge current not only damages to the electronic device and circuit board of electronic equipment internal, together
When electromagnetic interference and injury will also result in electrical network facilities, it is therefore necessary to larger surge current is suppressed.
The method of traditional suppression surge current is that suitable negative temperature coefficient is sealed in the loop of power rectifier circuit
Thermistor（NTC）, its resistance is larger under normal conditions for thermistor, and power switch connects moment, and thermistor resistance is larger, limit
The charging current to electric capacity is made, so as to inhibit surge current.This method simple possible, but existing deficiency be ought be in short-term
After power-off, because thermistor needs longer cool time to recover larger resistance, when thermistor is uncolled, if power supply is opened
When pass is again switched on or circuit re-powers, the protective effect of thermistor will decline or even not have protective effect.Meanwhile
During circuit normal work, because sealing in for thermistor causes circuit to produce very big loss, power-efficient is also reduced.
Chinese Patent Application No. 201110030057.2, disclose a kind of surge restraint circuit.The surge restraint circuit by
One FET, a transistor and several resistance and electric capacity composition.The surge restraint circuit is in electronic device works
All the time it is linked into power circuit, resistance is working all the time, therefore there is also produce electric energy loss, reduce asking for power-efficient
Topic.
The content of the invention
The utility model purpose is to provide a kind of surge current suppression circuit module.
To achieve the above object, the utility model takes following technical proposals：
Surge current suppression circuit module described in the utility model, including DC supply input Vin and dc source
Output end vo ut；The DC supply input Vin is connected with FET T1 source S end, the leakage of the FET T1
Pole D ends are connected by thermistor NET with the DC power output end Vout, scene effect pipe T1 source S end and drain D
The parallel branch being made up of electric capacity C1, resistance R1 is connected between end；FET T1 grid G end passes through resistance R2 and three poles
Pipe T2 colelctor electrode c ends connection, the base stage b ends of the triode T2 and programmable controller（PLC）The first control output end
Ctrl-1 connections, triode T2 emitter e end ground connection；DC supply input Vin and DC power output end Vout it
Between be connected with control relay K, normally opened contact j1 one end of the control relay K is connected with power input Vin, it is described often
The contact j1 other ends are opened to be connected with DC power output end Vout；Control relay K magnet coil L one end and dc source are defeated
Enter to hold Vin to connect, the magnet coil L other ends and the programmable controller（PLC）The second control output end Ctrl-2
Connection.
The utility model advantage is to pass through programmable controller（PLC）The intelligent control of Inrush current restraining is realized, is had
The shortcomings that effect overcomes pure hardware circuit in the prior art, control method is simple, is easily modified, and integrated level is high, and stability is good；And
After electrical equipment steady operation, thermistor NET is departed from into current supply circuit, reduces unnecessary power attenuation, is simultaneously
Reliable guarantee is provided when power switch is again switched on or circuit re-powers, in particular for high power electrical equipment, can be held
By very big surge current.
Brief description of the drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Embodiments of the invention are elaborated below in conjunction with the accompanying drawings, the present embodiment using technical solution of the present invention before
Put and implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to down
State embodiment.
As shown in figure 1, surge current suppression circuit module described in the utility model, including DC supply input Vin
With DC power output end Vout；The DC supply input Vin is connected with FET T1 source S end, the field effect
Should pipe T1 drain D end be connected by thermistor NET with the DC power output end Vout, scene effect pipe T1 source electrode
The parallel branch being made up of electric capacity C1, resistance R1 is connected between S ends and drain D end；FET T1 grid G end passes through electricity
Resistance R2 is connected with triode T2 colelctor electrode c ends, the base stage b ends of the triode T2 and programmable controller（PLC）First
Control output end Ctrl-1 connections, triode T2 emitter e end ground connection；It is defeated in DC supply input Vin and dc source
Go out to hold to be connected between Vout control relay K, the control relay K normally opened contact j1 one end and power input Vin
Connection, the normally opened contact j1 other ends are connected with DC power output end Vout；Control relay K magnet coil L one end
It is connected with DC supply input Vin, the magnet coil L other ends and the programmable controller（PLC）Second control
Output end Ctrl-2 connections.
When the utility model does not power to the load, DC supply input Vin keeps control source, due to PLC technology
Device（Integrated circuit EPM570T100C5N）The second control output end Ctrl-2 there is no a signal output, therefore control relay K loses
Electricity, its normally opened contact j1 are off, and FET T1 grid G end is in high level and ended, i.e. FET T1
Source S end and drain D end it is separated, DC power output end Vout is without output.
When needing powering load, the first control output end Ctrl-1 of programmable controller exports high level to three poles
Pipe T2 base stage b, triode T2 colelctor electrode c turn on emitter e, so that FET T1 grid G ground connection so that field
Effect pipe T1 source S and drain D conducting, dc source is by thermistor NET through DC power output end Vout to load
Power supply, while be the electric capacity charging in load, the charging interval is set by programmable controller program（Such as 500ms）, temperature-sensitive
Resistance NET plays a part of suppressing surge current.
After the charging interval of setting, the second control output end of programmable controller Ctrl-2 output low levels, control
Relay K magnet coil L obtains electric, and its normally opened contact j1 closure conductings, dc source powered to the load by normally opened contact j1.
Again by the time of programmable controller program setting（Such as 400ms）Afterwards, programmable controller first controls defeated
Go out to hold Ctrl-1 to export base stage b of the low level to triode T2, triode T2 cut-offs so that FET T1 source S and
Building pole D is disconnected, and thermistor NET departs from current supply circuit, and dc source is powered to the load by normally opened contact j1.
Because thermistor NET departs from current supply circuit, thermistor is cooled down and has recovered big resistance characteristic, is power supply
Reliable guarantee is provided when switch is again switched on or circuit re-powers.
Claims (1)
1. a kind of surge current suppression circuit module, including DC supply input Vin and DC power output end Vout；It is special
Sign is：The DC supply input Vin is connected with FET T1 source S end, the drain D end of the FET T1
Be connected by thermistor NET with the DC power output end Vout, scene effect pipe T1 source S end and drain D end it
Between be connected with the parallel branch being made up of electric capacity C1, resistance R1；FET T1 grid G end passes through resistance R2 and triode T2
The connection of colelctor electrode c ends, the first control output end Ctrl-1 of the base stage b ends of the triode T2 and programmable controller connects
Connect, triode T2 emitter e end ground connection；It is connected between DC supply input Vin and DC power output end Vout
Control relay K, normally opened contact j1 one end of the control relay K are connected with power input Vin, the normally opened contact j1
The other end is connected with DC power output end Vout；Control relay K magnet coil L one end and DC supply input Vin
Connection, the magnet coil L other ends are connected with the second control output end Ctrl-2 of the programmable controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721039602.3U CN207150163U (en) | 2017-08-18 | 2017-08-18 | Surge current suppression circuit module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721039602.3U CN207150163U (en) | 2017-08-18 | 2017-08-18 | Surge current suppression circuit module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207150163U true CN207150163U (en) | 2018-03-27 |
Family
ID=61666837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721039602.3U Active CN207150163U (en) | 2017-08-18 | 2017-08-18 | Surge current suppression circuit module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207150163U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107317315A (en) * | 2017-08-18 | 2017-11-03 | 安图实验仪器(郑州)有限公司 | Surge current suppression circuit module |
-
2017
- 2017-08-18 CN CN201721039602.3U patent/CN207150163U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107317315A (en) * | 2017-08-18 | 2017-11-03 | 安图实验仪器(郑州)有限公司 | Surge current suppression circuit module |
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