CN105305800B - A kind of surge current suppression circuit - Google Patents
A kind of surge current suppression circuit Download PDFInfo
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- CN105305800B CN105305800B CN201510797384.9A CN201510797384A CN105305800B CN 105305800 B CN105305800 B CN 105305800B CN 201510797384 A CN201510797384 A CN 201510797384A CN 105305800 B CN105305800 B CN 105305800B
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Abstract
The present invention provides a kind of surge current suppression circuit, after the power on circuitry, AC power is charged by D1, D2, R1, R2, R3 to C1, and the voltage of C1 is stabilized to the clamp voltage of voltage-stabiliser tube ZD1, the positive terminal potentials of C3 are input voltage after rectification, waveform is half-sinusoid, and C3 does not have charging path, and voltage is zero thereon, thus C3 negative terminal current potentials follow anode voltage change, the situation of change for directly reacting supply voltage, in supply voltage less than before Q1 operation voltages, Q1, Q2 are held off；When mains voltage variations are to less than Q1 operation voltages, power supply potential state is reflected by C3 negative terminal current potentials, so that Q1 conductings, electric current flows into the grid of Q2 from C1 by Q1 and R6, so that its current potential is increased and be more than to open threshold voltage, Q2 conductings, supply voltage is charged by Q2 to C3, supply voltage instantaneous value is extremely low at this time, and surge current is inhibited.
Description
Technical field
The present invention relates to power protecting circuit fields, more particularly, to a kind of surge current suppression circuit.
Background technology
Switch power supply equipment is capacitive load for power grid, and short-circuit condition is presented in equipment access power grid moment, from
Power grid absorbs great electric current, referred to as surge current（Inrush current）, which is much larger than running current, to electricity
Net and switch power supply equipment all cause threat, if do not inhibited to it, unit exception will be caused even to damage.
Currently used suppressing method is series impedance device in circuit, such as power resistor, thermistor, thermistor
Collocation relay etc..In these methods, Surge suppression effect and the contradiction of device own loss are difficult to reconcile, thus inhibit effect
Fruit is bad.Each specific method, which has, itself to be difficult to overcome the problems, such as：Thermistor resistance value in low temperature environment becomes very
Greatly, cause booting difficult, and resistance value becomes very little at high temperature, loses Surge suppression ability；Relay service life is short, more
Failure is easy after secondary booting.
Invention content
The present invention provides a kind of surge current suppression circuit, and the circuit is by detecting AC-input voltage, control switch electricity
Source device accesses power grid when alternating voltage instantaneous value is zero or near zero, achievees the purpose that limit inrush currents.
In order to reach above-mentioned technique effect, technical scheme is as follows：
A kind of surge current suppression circuit, including rectifier bridge BD1, diode D1-D3, resistance R1-R7, capacitance C1-C3, surely
Pressure pipe ZD1, triode Q1, field-effect tube Q2；Rectifier bridge BD1 includes the diode of 4 interconnections, and two of which diode is total
Cathode connects, and the cathode of the connection of other two diode common-anode, two diodes of common-anode connection is connect with common cathode
The anode connection of two diodes, the tie point between two diodes of two groups of mutually heteropolar connections be connected across alternating current zero curve and
Between firewire；The anode of diode D1 is connect with firewire, and the cathode of diode D1 is connect with one end of resistance R1, and resistance R1's is another
One end is connect with one end of resistance R2, and the other end of resistance R2 is connect with one end of resistance R3, the other end of resistance R3 respectively with
The emitter of one end of capacitance C1, one end of resistance R4 and triode Q1 connects, and the other end of capacitance C1 is connected to field-effect
The other end of the source electrode of pipe Q2, resistance R4 is connected to the base stage of triode；Voltage-stabiliser tube ZD1 is connected in parallel on the both ends of capacitance C1, capacitance
One end of C2 and the base stage of triode connect, and the other end of capacitance C2 is connect with the source electrode of field-effect tube Q2, one end of resistance R5
It is connect with the collector of triode, the other end of resistance R5 is connect with the source electrode of field-effect tube Q2, one end of resistance R6 and three poles
The collector of pipe connects, and the other end of resistance R6 is connect with the grid of field-effect tube Q2, one end of resistance R7 and the base of triode
Pole connects, and the other end of resistance R7 is connect with the anode of diode D3, and the cathode of diode D3 connects with the drain electrode of field-effect tube Q2
It connects；The common cathode tie point for two diodes that one end of capacitance C3 is connect with the common cathode in rectifier bridge BD1 connects, capacitance C3
The other end connect with the drain electrode of field-effect tube Q2, the common-anode of two diodes of common-anode in rectifier bridge BD1 connection connects
Contact is connected to the source electrode of field-effect tube Q2.
Preferably, the capacitance C1 and C2 is capacitor.
Preferably, the capacitance C3 is electrolytic capacitor.
Preferably, the triode Q1 is PNP type triode.
Preferably, the diode D1-D3 is high withstand voltage diode.
In the present invention, when not powering on, the voltage on all capacitances is zero, and triode Q1 is turned off with field-effect tube Q2,
After energization, AC power is charged by diode D1, diode D2, resistance R1, resistance R2, resistance R3 to capacitance C1, capacitance C1
Voltage be stabilized to the clamp voltage of voltage-stabiliser tube ZD1, the positive terminal potentials of capacitance C3 are input voltage after rectification, and waveform is sinusoidal half
Wave, capacitance C3 do not have charging path, and voltage is zero thereon, thus capacitance C3 negative terminal current potentials follow anode voltage change, directly anti-
The situation of change for answering supply voltage, in supply voltage less than before triode Q1 operation voltages, triode Q1, field-effect tube Q2 are protected
Hold off state；When mains voltage variations are to less than triode Q1 operation voltages, power supply potential state is by capacitance C3 negative terminal electricity
Position reflection so that triode Q1 conductings, electric current flow into the grid of field-effect tube Q2 from capacitance C1 by triode Q1 and resistance R6,
So that its current potential is increased and be more than to open threshold voltage, field-effect tube Q2 conducting, supply voltage is by field-effect tube Q2 to capacitance C3
Charging, supply voltage instantaneous value is extremely low at this time, and surge current is inhibited；After field-effect tube Q2 actions, capacitance C3 negative terminals are drawn
To no-voltage so that triode Q1 is held on, and is formed and is interlocked with field-effect tube Q2, ensures that field-effect tube Q2 is not when normal work
It turns off.
Compared with prior art, the advantageous effect of technical solution of the present invention is：
After power on circuitry of the present invention, AC power by diode D1, diode D2, resistance R1, resistance R2, resistance R3 to
Capacitance C1 charging, the voltage of capacitance C1 are stabilized to the clamp voltage of voltage-stabiliser tube ZD1, and the positive terminal potentials of capacitance C3 are to input after rectification
Voltage, waveform are half-sinusoid, and capacitance C3 does not have charging path, and voltage is zero thereon, thus capacitance C3 negative terminal current potentials follow just
Terminal voltage changes, and directly reacts the situation of change of supply voltage, before supply voltage is less than triode Q1 operation voltages, triode
Q1, field-effect tube Q2 are held off；When mains voltage variations are to less than triode Q1 operation voltages, power supply potential shape
State is reflected by capacitance C3 negative terminal current potentials so that triode Q1 conductings, electric current are flowed into from capacitance C1 by triode Q1 and resistance R6
The grid of field-effect tube Q2 makes its current potential increase and is more than to open threshold voltage, and field-effect tube Q2 conductings, supply voltage passes through field
Effect pipe Q2 charges to capacitance C3, and supply voltage instantaneous value is extremely low at this time, and surge current is inhibited.
Description of the drawings
Fig. 1 is circuit diagram of the present invention.
Specific implementation mode
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；
In order to more preferably illustrate that the present embodiment, the certain components of attached drawing have omission, zoom in or out, actual product is not represented
Size；
To those skilled in the art, it is to be appreciated that certain known features and its explanation, which may be omitted, in attached drawing
's.
The following further describes the technical solution of the present invention with reference to the accompanying drawings and examples.
Embodiment 1
As shown in Figure 1, a kind of surge current suppression circuit, including rectifier bridge BD1, diode D1-D3, resistance R1-R7, electricity
Hold C1-C3, voltage-stabiliser tube ZD1, triode Q1, field-effect tube Q2；Rectifier bridge BD1 includes the diode of 4 interconnections, wherein two
A diode common cathode connection, the connection of other two diode common-anode, the cathode of two diodes of common-anode connection is together
The anode of two diodes of cathode connection connects, and the tie point between two diodes of two groups of mutually heteropolar connections is connected across city
Between the zero curve and firewire of electricity；The anode of diode D1 is connect with firewire, and the cathode of diode D1 is connect with one end of resistance R1,
The other end of resistance R1 is connect with one end of resistance R2, and the other end of resistance R2 is connect with one end of resistance R3, and resistance R3's is another
One end is connect with the emitter of one end of capacitance C1, one end of resistance R4 and triode Q1 respectively, and the other end of capacitance C1 connects
It is connected to the source electrode of field-effect tube Q2, the other end of resistance R4 is connected to the base stage of triode；Voltage-stabiliser tube ZD1 is connected in parallel on capacitance C1's
Both ends, one end of capacitance C2 and the base stage of triode connect, and the other end of capacitance C2 is connect with the source electrode of field-effect tube Q2, resistance
One end of R5 and the collector of triode connect, and the other end of resistance R5 is connect with the source electrode of field-effect tube Q2, and the one of resistance R6
End is connect with the collector of triode, and the other end of resistance R6 is connect with the grid of field-effect tube Q2, one end of resistance R7 and three
The base stage of pole pipe connects, and the other end of resistance R7 is connect with the anode of diode D3, cathode and the field-effect tube Q2 of diode D3
Drain electrode connection；The common cathode tie point for two diodes that one end of capacitance C3 is connect with the common cathode in rectifier bridge BD1 connects
It connects, the other end of capacitance C3 is connect with the drain electrode of field-effect tube Q2, two diodes of the common-anode connection in rectifier bridge BD1
Common-anode tie point is connected to the source electrode of field-effect tube Q2.
In the present embodiment, capacitance C1 and C2 are capacitor；Capacitance C3 is electrolytic capacitor；Triode Q1 is PNP type triode；
Diode D1-D3 is high withstand voltage diode.
Working principle of the present invention is as follows：
When circuit is not powered on, the voltage on all capacitances is zero, and triode Q1 is turned off with field-effect tube Q2, after energization,
AC power is charged by diode D1, diode D2, resistance R1, resistance R2, resistance R3 to capacitance C1, the voltage quilt of capacitance C1
Stablize to the clamp voltage of voltage-stabiliser tube ZD1, the positive terminal potentials of capacitance C3 are input voltage after rectification, and waveform is half-sinusoid, capacitance
C3 does not have charging path, and voltage is zero thereon, thus capacitance C3 negative terminal current potentials follow anode voltage change, directly react power supply electricity
The situation of change of pressure, in supply voltage less than before triode Q1 operation voltages, triode Q1, field-effect tube Q2 are held off shape
State；When mains voltage variations are to less than triode Q1 operation voltages, power supply potential state is reflected by capacitance C3 negative terminal current potentials, makes
Triode Q1 conductings are obtained, electric current is flowed into the grid of field-effect tube Q2 by triode Q1 and resistance R6 from capacitance C1, makes its current potential
It increases and is more than to open threshold voltage, field-effect tube Q2 conductings, supply voltage is charged by field-effect tube Q2 to capacitance C3, at this time
Supply voltage instantaneous value is extremely low, and surge current is inhibited.
The same or similar label correspond to the same or similar components；
Position relationship described in attached drawing is used to only for illustration, should not be understood as the limitation to this patent；
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
All any modification, equivalent and improvement etc., should be included in the claims in the present invention made by within the spirit and principle of invention
Protection domain within.
Claims (5)
1. a kind of surge current suppression circuit, which is characterized in that including rectifier bridge BD1, diode D1-D3, resistance R1-R7, electricity
Hold C1-C3, voltage-stabiliser tube ZD1, triode Q1, field-effect tube Q2；Rectifier bridge BD1 includes the diode of 4 interconnections, wherein two
A diode common cathode connection, the connection of other two diode common-anode, the cathode of two diodes of common-anode connection is together
The anode of two diodes of cathode connection connects, and the tie point between two diodes of two groups of mutually heteropolar connections is connected across city
Between the zero curve and firewire of electricity；The anode of diode D1 is connect with firewire, and the cathode of diode D1 is connect with one end of resistance R1,
The other end of resistance R1 is connect with one end of resistance R2, and the other end of resistance R2 is connect with one end of resistance R3, and resistance R3's is another
One end is connect with the emitter of one end of capacitance C1, one end of resistance R4 and triode Q1 respectively, and the other end of capacitance C1 connects
It is connected to the source electrode of field-effect tube Q2, the other end of resistance R4 is connected to the base stage of triode；Voltage-stabiliser tube ZD1 is connected in parallel on capacitance C1's
Both ends, one end of capacitance C2 and the base stage of triode connect, and the other end of capacitance C2 is connect with the source electrode of field-effect tube Q2, resistance
One end of R5 and the collector of triode connect, and the other end of resistance R5 is connect with the source electrode of field-effect tube Q2, and the one of resistance R6
End is connect with the collector of triode, and the other end of resistance R6 is connect with the grid of field-effect tube Q2, one end of resistance R7 and three
The base stage of pole pipe connects, and the other end of resistance R7 is connect with the anode of diode D3, cathode and the field-effect tube Q2 of diode D3
Drain electrode connection；The common cathode tie point for two diodes that one end of capacitance C3 is connect with the common cathode in rectifier bridge BD1 connects
It connects, the other end of capacitance C3 is connect with the drain electrode of field-effect tube Q2, two diodes of the common-anode connection in rectifier bridge BD1
Common-anode tie point is connected to the source electrode of field-effect tube Q2.
2. surge current suppression circuit according to claim 1, which is characterized in that the capacitance C1 and C2 is capacitor.
3. surge current suppression circuit according to claim 1, which is characterized in that the capacitance C3 is electrolytic capacitor.
4. surge current suppression circuit according to claim 1, which is characterized in that the triode Q1 is three pole of positive-negative-positive
Pipe.
5. surge current suppression circuit according to claim 1, which is characterized in that the diode D1-D3 is high voltage
Diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510797384.9A CN105305800B (en) | 2015-11-18 | 2015-11-18 | A kind of surge current suppression circuit |
Applications Claiming Priority (1)
| 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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| Publication Number | Publication Date |
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| CN105305800A CN105305800A (en) | 2016-02-03 |
| CN105305800B true CN105305800B (en) | 2018-08-28 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105680678B (en) * | 2016-03-30 | 2019-01-18 | 合肥惠科金扬科技有限公司 | A kind of discharge circuit and AC power supply 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 |
| 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 |
| CN112003255B (en) * | 2020-07-29 | 2022-07-08 | 苏州浪潮智能科技有限公司 | Power supply surge current suppression device and method |
| CN112968616B (en) * | 2021-02-19 | 2022-02-15 | 北京泰力控科技有限公司 | AC-DC converter and AC-DC conversion system |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101764578B (en) * | 2009-12-15 | 2011-11-16 | 天水华天微电子股份有限公司 | Dual-path synchronous SS (soft start) control circuit |
| CN201726130U (en) * | 2010-07-27 | 2011-01-26 | 长城信息产业股份有限公司 | Direct-current surge suppression circuit |
| CN102231518B (en) * | 2011-06-10 | 2013-09-25 | 广州金升阳科技有限公司 | Surging suppression circuit |
| CN104135146B (en) * | 2014-07-29 | 2017-02-15 | 广州金升阳科技有限公司 | Soft starting method and circuit |
| CN204068682U (en) * | 2014-08-23 | 2014-12-31 | 成都四威航空电源有限公司 | A kind of high-power low-loss surge restraint circuit |
| CN205141988U (en) * | 2015-11-18 | 2016-04-06 | 明纬(广州)电子有限公司 | Surge current suppressing circuit |
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