CN105305800A - Surge current suppression circuit - Google Patents
Surge current suppression circuit Download PDFInfo
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- CN105305800A CN105305800A CN201510797384.9A CN201510797384A CN105305800A CN 105305800 A CN105305800 A CN 105305800A CN 201510797384 A CN201510797384 A CN 201510797384A CN 105305800 A CN105305800 A CN 105305800A
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Abstract
The invention provides a surge current suppression circuit. After the suppression circuit is electrified, an alternating-current power supply charges a C1 via a D1, a D2, an R1, an R2 and an R3. The voltage of the C1 is stabilized to be the clamping voltage of a voltage-regulator tube ZD1. The positive-end level of the C3 is the input voltage after rectification, the waveform is the sine half-wave and the C3 does not have charging access. The voltage of the C3 is 0, thus, the negative end level of the C3 changes along with the positive-end voltage and change conditions of the power voltage is directly reflected. Before the power voltage is lower than the Q1 operating voltage, a Q1 and a Q2 are kept in the turned-off state. When the power voltage changes to be lower than the Q1 operating voltage, the power level state is reflected by the negative-end level of the C3 and then the Q1 is conductive. Current flows into the grid electrode of the Q2 via the Q1 and an R6 from the C1, so level of the Q2 is increased and exceeds the open threshold voltage, and the Q2 is conductive. When the power voltage charges the C3 via the Q2, the instantaneous value of the power voltage is quite low and the surge current can be suppressed.
Description
Technical field
The present invention relates to power protecting circuit field, more specifically, relate 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.
Summary of the invention
The invention 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, technical scheme of the present invention 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 present invention, 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 solution of the present invention is:
After power on circuitry of the present invention, 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 circuit theory diagrams of the present invention.
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, technical scheme of the present invention 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 invention 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, the above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.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 any amendments done within the spirit and principles in the present invention, equivalent to replace and improvement etc., within the protection range that all should be included in the claims in the present invention.
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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510797384.9A CN105305800B (en) | 2015-11-18 | 2015-11-18 | A kind of surge current suppression circuit |
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|---|---|---|---|
| CN201510797384.9A CN105305800B (en) | 2015-11-18 | 2015-11-18 | A kind of surge current suppression circuit |
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| CN105305800A true CN105305800A (en) | 2016-02-03 |
| CN105305800B CN105305800B (en) | 2018-08-28 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105680678A (en) * | 2016-03-30 | 2016-06-15 | 合肥惠科金扬科技有限公司 | Discharge circuit and AC power supply device |
| CN105764004A (en) * | 2016-02-29 | 2016-07-13 | 广东欧珀移动通信有限公司 | Headphone jack protection circuit, headphone jack circuit and mobile device |
| CN106787658A (en) * | 2016-12-30 | 2017-05-31 | 天水七四九电子有限公司 | A kind of power-on surge current suppression circuit of temperature work ultra-low loss wide |
| CN110291691A (en) * | 2017-02-13 | 2019-09-27 | 赤多尼科两合股份有限公司 | Circuit for the surge current limitation at power supply |
| CN111555598A (en) * | 2020-04-29 | 2020-08-18 | 中国电子科技集团公司第二十九研究所 | Intelligent capacitor and working method thereof |
| CN112003255A (en) * | 2020-07-29 | 2020-11-27 | 苏州浪潮智能科技有限公司 | Power supply surge current suppression device and method |
| CN112968616A (en) * | 2021-02-19 | 2021-06-15 | 北京泰力控科技有限公司 | AC-DC converter and AC-DC conversion system |
| CN113765387A (en) * | 2020-06-02 | 2021-12-07 | 上海芯熠微电子有限公司 | Method and apparatus for broadening voltage range of AC-DC converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105764004A (en) * | 2016-02-29 | 2016-07-13 | 广东欧珀移动通信有限公司 | Headphone jack protection circuit, headphone jack circuit and mobile device |
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| CN106787658A (en) * | 2016-12-30 | 2017-05-31 | 天水七四九电子有限公司 | A kind of power-on surge current suppression circuit of temperature work ultra-low loss wide |
| CN110291691A (en) * | 2017-02-13 | 2019-09-27 | 赤多尼科两合股份有限公司 | Circuit for the surge current limitation at power supply |
| CN111555598A (en) * | 2020-04-29 | 2020-08-18 | 中国电子科技集团公司第二十九研究所 | Intelligent capacitor and working method thereof |
| CN113765387A (en) * | 2020-06-02 | 2021-12-07 | 上海芯熠微电子有限公司 | Method and apparatus for broadening voltage range of AC-DC converter |
| CN113765387B (en) * | 2020-06-02 | 2024-04-26 | 上海芯熠微电子有限公司 | Method and device for widening voltage range of alternating current-direct current converter |
| CN112003255A (en) * | 2020-07-29 | 2020-11-27 | 苏州浪潮智能科技有限公司 | Power supply surge current suppression device and method |
| CN112968616A (en) * | 2021-02-19 | 2021-06-15 | 北京泰力控科技有限公司 | AC-DC converter and AC-DC conversion system |
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| CN105305800B (en) | 2018-08-28 |
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