CN205141988U - Surge current suppressing circuit - Google Patents
Surge current suppressing circuit Download PDFInfo
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- CN205141988U CN205141988U CN201520922554.7U CN201520922554U CN205141988U CN 205141988 U CN205141988 U CN 205141988U CN 201520922554 U CN201520922554 U CN 201520922554U CN 205141988 U CN205141988 U CN 205141988U
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Abstract
The utility model provides a surge current suppressing circuit, this circuit circular telegram back, alternating current power supply passes through D1, D2, R1, R2, R3 charges to C1, C1's voltage is by stable clamp voltage to stabilivolt ZD1, C3 anode current potential is input voltage after the rectification, the wave form is the halfsinusoid, the C3 route that does not charge, voltage is zero on it, therefore anode voltage variation is followed to C3 negative terminal current potential, direct reaction mains voltage's situation of change, before mains voltage is less than Q1 action voltage, Q1, Q2 all keeps off state, change when being less than Q1 action voltage as mains voltage, the power supply potential state is reflected by C3 negative terminal current potential for Q1 switches on, and the grid that C1 passes through Q1 and R6 inflow Q2 is followed to the electric current, makes its current potential rising and surpass to open threshold voltage, and Q2 switches on, and mains voltage charges to C3 through Q2, and the mains voltage instantaneous value is extremely low at this moment, and surge current obtains the suppression.
Description
Technical field
The utility model relates to power protecting circuit field, more specifically, relates to a kind of surge current suppression circuit.
Background technology
Switch power supply equipment is capacitive load for electrical network, short-circuit condition is presented instantaneously at equipment access electrical network, great electric current is absorbed from electrical network, be called surge current (Inrushcurrent), this electric current is much larger than running current, all threat being caused to electrical network and switch power supply equipment, if do not suppressed it, unit exception will be caused even to damage.
At present conventional suppressing method is series impedance device in circuit, as power resistor, thermistor, thermistor collocation relay etc.In these methods, the contradiction of Surge suppression effect and device own loss is difficult to be in harmonious proportion, and thus inhibition is not good.Each concrete method has the problem self being difficult to overcome: thermistor resistance value in low temperature environment becomes very large, cause start difficulty, and resistance value becomes very little when high temperature, loses Surge suppression ability; Relay is short for useful life, repeatedly easily loses efficacy after start.
Utility model content
The utility model provides a kind of surge current suppression circuit, this circuit by detect AC-input voltage, control switch power-supply device alternating voltage instantaneous value be zero or close to zero time access electrical network, reach the object of limit inrush currents.
In order to reach above-mentioned technique effect, the technical solution of the utility model is as follows:
A kind of surge current suppression circuit, comprises rectifier bridge BD1, diode D1-D3, resistance R1-R7, electric capacity C1-C3, voltage-stabiliser tube ZD1, triode Q1, field effect transistor Q2; Rectifier bridge BD1 comprises 4 interconnective diodes, wherein two diode common cathodes connect, two other diode common anode pole connects, the anode of two diodes that the negative electrode of two diodes that common anode pole connects is connected with common cathode connects, and the tie point between two diodes of two groups of phase heteropole connections is connected across between the zero line of civil power and live wire; The anode of diode D1 is connected with live wire, the negative electrode of diode D1 is connected with one end of resistance R1, the other end of resistance R1 is connected with one end of resistance R2, the other end of resistance R2 is connected with one end of resistance R3, the other end of resistance R3 is connected with the emitter of one end of electric capacity C1, one end of resistance R4 and triode Q1 respectively, the other end of electric capacity C1 is connected to the source electrode of field effect transistor Q2, and the other end of resistance R4 is connected to the base stage of triode; Voltage-stabiliser tube ZD1 is connected in parallel on the two ends of electric capacity C1, one end of electric capacity C2 is connected with the base stage of triode, the other end of electric capacity C2 is connected with the source electrode of field effect transistor Q2, and one end of resistance R5 is connected with the collector electrode of triode, and the other end of resistance R5 is connected with the source electrode of field effect transistor Q2
,one end of resistance R6 is connected with the collector electrode of triode, the other end of resistance R6 is connected with the grid of field effect transistor Q2, one end of resistance R7 is connected with the base stage of triode, and the other end of resistance R7 is connected with the anode of diode D3, and the negative electrode of diode D3 is connected with the drain electrode of field effect transistor Q2; The common cathode tie point of two diodes that one end of electric capacity C3 is connected with the common cathode in rectifier bridge BD1 connects, the other end of electric capacity C3 is connected with the drain electrode of field effect transistor Q2, and the common anode pole tie point of two diodes that the common anode pole in rectifier bridge BD1 connects is connected to the source electrode of field effect transistor Q2.
Preferably, described electric capacity C1 and C2 is capacitor.
Preferably, described electric capacity C3 is electrochemical capacitor.
Preferably, described triode Q1 is PNP type triode.
Preferably, described diode D1-D3 is high withstand voltage diode.
In the utility model, when not powering on, voltage on all electric capacity is zero, triode Q1 and field effect transistor Q2 all ends, after energising, AC power is by diode D1, diode D2, resistance R1, resistance R2, resistance R3 charges to electric capacity C1, the voltage of electric capacity C1 is stabilized to the clamp voltage of voltage-stabiliser tube ZD1, the positive terminal potential of electric capacity C3 is input voltage after rectification, waveform is half-sinusoid, electric capacity C3 does not have charging path, on it, voltage is zero, thus electric capacity C3 negative terminal current potential follows anode change in voltage, the situation of change of direct reaction supply voltage, before supply voltage is lower than triode Q1 operation voltage, triode Q1, field effect transistor Q2 all keeps off state, when mains voltage variations is to during lower than triode Q1 operation voltage, power supply potential state is reflected by electric capacity C3 negative terminal current potential, make triode Q1 conducting, electric current flows into the grid of field effect transistor Q2 by triode Q1 and resistance R6 from electric capacity C1, make its current potential raise and exceed and open threshold voltage, field effect transistor Q2 conducting, supply voltage is charged to electric capacity C3 by field effect transistor Q2, now supply voltage instantaneous value is extremely low, and surge current is inhibited, after field effect transistor Q2 action, electric capacity C3 negative terminal is pulled to no-voltage, makes triode Q1 keep conducting, is formed interlock with field effect transistor Q2, and when ensureing normally to work, field effect transistor Q2 does not turn off.
Compared with prior art, the beneficial effect of technical solutions of the utility model is:
After the utility model power on circuitry, AC power is charged to electric capacity C1 by diode D1, diode D2, resistance R1, resistance R2, resistance R3, the voltage of electric capacity C1 is stabilized to the clamp voltage of voltage-stabiliser tube ZD1, the positive terminal potential of electric capacity C3 is input voltage after rectification, waveform is half-sinusoid, electric capacity C3 does not have charging path, on it, voltage is zero, thus electric capacity C3 negative terminal current potential follows anode change in voltage, the situation of change of direct reaction supply voltage, before supply voltage is lower than triode Q1 operation voltage, triode Q1, field effect transistor Q2 all keep off state; When mains voltage variations is to during lower than triode Q1 operation voltage, power supply potential state is reflected by electric capacity C3 negative terminal current potential, make triode Q1 conducting, electric current flows into the grid of field effect transistor Q2 by triode Q1 and resistance R6 from electric capacity C1, make its current potential raise and exceed and open threshold voltage, field effect transistor Q2 conducting, supply voltage is charged to electric capacity C3 by field effect transistor Q2, now supply voltage instantaneous value is extremely low, and surge current is inhibited.
Accompanying drawing explanation
Fig. 1 is the utility model circuit theory diagrams.
Embodiment
Accompanying drawing, only for exemplary illustration, can not be interpreted as the restriction to this patent;
In order to better the present embodiment is described, some parts of accompanying drawing have omission, zoom in or out, and do not represent the size of actual product;
To those skilled in the art, in accompanying drawing, some known features and explanation thereof may be omitted is understandable.
Below in conjunction with drawings and Examples, the technical solution of the utility model is described further.
Embodiment 1
As shown in Figure 1, a kind of surge current suppression circuit, comprises rectifier bridge BD1, diode D1-D3, resistance R1-R7, electric capacity C1-C3, voltage-stabiliser tube ZD1, triode Q1, field effect transistor Q2; Rectifier bridge BD1 comprises 4 interconnective diodes, wherein two diode common cathodes connect, two other diode common anode pole connects, the anode of two diodes that the negative electrode of two diodes that common anode pole connects is connected with common cathode connects, and the tie point between two diodes of two groups of phase heteropole connections is connected across between the zero line of civil power and live wire; The anode of diode D1 is connected with live wire, the negative electrode of diode D1 is connected with one end of resistance R1, the other end of resistance R1 is connected with one end of resistance R2, the other end of resistance R2 is connected with one end of resistance R3, the other end of resistance R3 is connected with the emitter of one end of electric capacity C1, one end of resistance R4 and triode Q1 respectively, the other end of electric capacity C1 is connected to the source electrode of field effect transistor Q2, and the other end of resistance R4 is connected to the base stage of triode; Voltage-stabiliser tube ZD1 is connected in parallel on the two ends of electric capacity C1, one end of electric capacity C2 is connected with the base stage of triode, the other end of electric capacity C2 is connected with the source electrode of field effect transistor Q2, and one end of resistance R5 is connected with the collector electrode of triode, and the other end of resistance R5 is connected with the source electrode of field effect transistor Q2
,one end of resistance R6 is connected with the collector electrode of triode, the other end of resistance R6 is connected with the grid of field effect transistor Q2, one end of resistance R7 is connected with the base stage of triode, and the other end of resistance R7 is connected with the anode of diode D3, and the negative electrode of diode D3 is connected with the drain electrode of field effect transistor Q2; The common cathode tie point of two diodes that one end of electric capacity C3 is connected with the common cathode in rectifier bridge BD1 connects, the other end of electric capacity C3 is connected with the drain electrode of field effect transistor Q2, and the common anode pole tie point of two diodes that the common anode pole in rectifier bridge BD1 connects is connected to the source electrode of field effect transistor Q2.
In the present embodiment, electric capacity C1 and C2 is capacitor; Electric capacity C3 is electrochemical capacitor; Triode Q1 is PNP type triode; Diode D1-D3 is high withstand voltage diode.
Operation principle of the present utility model is as follows:
When circuit is not energized, voltage on all electric capacity is zero, triode Q1 and field effect transistor Q2 all ends, after energising, AC power is by diode D1, diode D2, resistance R1, resistance R2, resistance R3 charges to electric capacity C1, the voltage of electric capacity C1 is stabilized to the clamp voltage of voltage-stabiliser tube ZD1, the positive terminal potential of electric capacity C3 is input voltage after rectification, waveform is half-sinusoid, electric capacity C3 does not have charging path, on it, voltage is zero, thus electric capacity C3 negative terminal current potential follows anode change in voltage, the situation of change of direct reaction supply voltage, before supply voltage is lower than triode Q1 operation voltage, triode Q1, field effect transistor Q2 all keeps off state, when mains voltage variations is to during lower than triode Q1 operation voltage, power supply potential state is reflected by electric capacity C3 negative terminal current potential, make triode Q1 conducting, electric current flows into the grid of field effect transistor Q2 by triode Q1 and resistance R6 from electric capacity C1, make its current potential raise and exceed and open threshold voltage, field effect transistor Q2 conducting, supply voltage is charged to electric capacity C3 by field effect transistor Q2, now supply voltage instantaneous value is extremely low, and surge current is inhibited.
The corresponding same or analogous parts of same or analogous label;
Describe in accompanying drawing position relationship for only for exemplary illustration, the restriction to this patent can not be interpreted as;
Obviously, above-described embodiment of the present utility model is only for the utility model example is clearly described, and is not the restriction to execution mode of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all execution modes.All do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., within the protection range that all should be included in the utility model claim.
Claims (5)
1. a surge current suppression circuit, is characterized in that, comprises rectifier bridge BD1, diode D1-D3, resistance R1-R7, electric capacity C1-C3, voltage-stabiliser tube ZD1, triode Q1, field effect transistor Q2; Rectifier bridge BD1 comprises 4 interconnective diodes, wherein two diode common cathodes connect, two other diode common anode pole connects, the anode of two diodes that the negative electrode of two diodes that common anode pole connects is connected with common cathode connects, and the tie point between two diodes of two groups of phase heteropole connections is connected across between the zero line of civil power and live wire; The anode of diode D1 is connected with live wire, the negative electrode of diode D1 is connected with one end of resistance R1, the other end of resistance R1 is connected with one end of resistance R2, the other end of resistance R2 is connected with one end of resistance R3, the other end of resistance R3 is connected with the emitter of one end of electric capacity C1, one end of resistance R4 and triode Q1 respectively, the other end of electric capacity C1 is connected to the source electrode of field effect transistor Q2, and the other end of resistance R4 is connected to the base stage of triode; Voltage-stabiliser tube ZD1 is connected in parallel on the two ends of electric capacity C1, one end of electric capacity C2 is connected with the base stage of triode, the other end of electric capacity C2 is connected with the source electrode of field effect transistor Q2, and one end of resistance R5 is connected with the collector electrode of triode, and the other end of resistance R5 is connected with the source electrode of field effect transistor Q2
,one end of resistance R6 is connected with the collector electrode of triode, the other end of resistance R6 is connected with the grid of field effect transistor Q2, one end of resistance R7 is connected with the base stage of triode, and the other end of resistance R7 is connected with the anode of diode D3, and the negative electrode of diode D3 is connected with the drain electrode of field effect transistor Q2; The common cathode tie point of two diodes that one end of electric capacity C3 is connected with the common cathode in rectifier bridge BD1 connects, the other end of electric capacity C3 is connected with the drain electrode of field effect transistor Q2, and the common anode pole tie point of two diodes that the common anode pole in rectifier bridge BD1 connects is connected to the source electrode of field effect transistor Q2.
2. surge current suppression circuit according to claim 1, is characterized in that, described electric capacity C1 and C2 is capacitor.
3. surge current suppression circuit according to claim 1, is characterized in that, described electric capacity C3 is electrochemical capacitor.
4. surge current suppression circuit according to claim 1, is characterized in that, described triode Q1 is PNP type triode.
5. surge current suppression circuit according to claim 1, is characterized in that, described diode D1-D3 is high withstand voltage diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520922554.7U CN205141988U (en) | 2015-11-18 | 2015-11-18 | Surge current suppressing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520922554.7U CN205141988U (en) | 2015-11-18 | 2015-11-18 | Surge current suppressing circuit |
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| Publication Number | Publication Date |
|---|---|
| CN205141988U true CN205141988U (en) | 2016-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520922554.7U Expired - Fee Related CN205141988U (en) | 2015-11-18 | 2015-11-18 | Surge current suppressing circuit |
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| CN (1) | CN205141988U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305800A (en) * | 2015-11-18 | 2016-02-03 | 明纬(广州)电子有限公司 | Surge current suppression circuit |
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2015
- 2015-11-18 CN CN201520922554.7U patent/CN205141988U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305800A (en) * | 2015-11-18 | 2016-02-03 | 明纬(广州)电子有限公司 | Surge current suppression circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160406 Termination date: 20201118 |