CN105244864A - Anti-flowing backwards protection circuit - Google Patents
Anti-flowing backwards protection circuit Download PDFInfo
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- CN105244864A CN105244864A CN201510799628.7A CN201510799628A CN105244864A CN 105244864 A CN105244864 A CN 105244864A CN 201510799628 A CN201510799628 A CN 201510799628A CN 105244864 A CN105244864 A CN 105244864A
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Abstract
The invention provides an anti-flowing backwards protection circuit, which is electrically connected between an input circuit and an output circuit. The anti-flowing backwards protection circuit comprises a reference voltage providing circuit, a voltage comparing circuit and an anti-flowing backwards circuit, wherein the voltage comparing circuit comprises a current detection resistor; the output end of the reference voltage providing circuit is connected with the first input end of the voltage comparing circuit; the negative electrode of the input circuit is connected with the negative electrode of the output circuit via the current detection resistor; feedback voltage is formed on the current detection resistor to act on the second input end of the voltage comparing circuit; and the anti-flowing backwards circuit comprises a P channel MOSFET. Through comparing the reference voltage and the feedback voltage by the voltage comparing circuit, the working state of the P channel MOSFET is controlled through the output end of the voltage comparing circuit, backward flowing current can be prevented from entering the input circuit from the output circuit, and the technical problems of large power consumption and much cooling when a diode is adopted in the prior art to realize backward flowing prevention can be solved.
Description
Technical field
The present invention relates to circuit protection technical field, fill with protective circuit in particular to a kind of counnter attack.
Background technology
Counnter attack is filled with protective circuit and is often used to prevent that output end current is counter fills with damage power supply; direct current of the prior art exports counnter attack filling control circuit and realizes counnter attack filling by a diode; circuit is as Fig. 1; AC rectification is direct current by rectifier bridge BR1 by ac current source; the direct-flow positive pole of rectifier bridge BR1 is connected with C2 positive pole; direct current negative pole is connected with C2 negative pole, utilizes C2 to carry out energy storage and filtering.Direct-flow positive pole is connected with the positive pole of diode D1, and the negative pole of diode D1 is connected with direct current output cathode.And direct current output negative pole is directly connected with the negative pole of C2.Because diode D1 can only one-directional flow electric current, namely output current from C2 positive pole, can only flow through D1 positive pole, then flows through D1 negative pole, then flow to direct current output cathode, after power consumption equipment, flow to direct current output negative pole, forms loop.That is, a series connection diode in output loop, just can prevent current flowing backwards.
But when output current is larger, the loss power on diode D1 is comparatively large, and such as, when exporting 5A, suppose diode D1 pressure drop 0.4V, so on diode, the wasted power of D1 is 5A × 0.4V=2W.The consequence caused is that diode heat power consumption is large, heat radiation difficulty.How providing a kind of counnter attack of low-power consumption to fill with control circuit is the anxious technical issues that need to address for a person skilled in the art.
Summary of the invention
In view of this, the invention provides a kind of counnter attack and fill with protective circuit, adopt diode to realize the technical problem that when counnter attack is filled with, power consumption is large and heat radiation is difficult to improve in prior art.
For achieving the above object, the invention provides following technical scheme: protective circuit is filled with in a kind of counnter attack, and it is electrically connected between an input circuit and an output circuit.This counnter attack is filled with protective circuit and is comprised: reference voltage provides circuit, voltage comparator circuit and counnter attack to fill with control circuit.Described voltage comparator circuit comprises current sense resistor.Described reference voltage provides the output of circuit to be connected with the first input end of described voltage comparator circuit.The negative pole of described input circuit is connected with described output circuit negative pole via described current sense resistor, described current sense resistor is formed the second input that back voltage acts on described voltage comparator circuit.Described counnter attack is filled with control circuit and is comprised a P channel mosfet, the first resistance, the first voltage-stabiliser tube and triode.The drain electrode of described P channel mosfet is connected with described input circuit positive pole, and the source electrode of described P channel mosfet is connected with the positive pole of described output circuit.Described first voltage-stabiliser tube is connected between the source electrode of described P channel mosfet and the grid of described P channel mosfet, and the positive pole of described first voltage-stabiliser tube is connected with the grid of described P channel mosfet, and described first resistance is in parallel with described first voltage-stabiliser tube.The grid of described P channel mosfet is via described triode ground connection, and the output of described voltage comparator circuit is connected with the base stage of described triode.Described voltage comparator circuit compares described reference voltage and described back voltage, controls described P channel mosfet operating state by the output of described voltage comparator circuit, prevents anti-electric current of filling with from entering described input circuit from described output circuit.
Further, reference voltage described in protective circuit is filled with in above-mentioned counnter attack provides circuit to comprise a voltage stabilizing element, the 7th resistance and the 8th resistance.Described voltage stabilizing element via the 7th resistance be connected in series and the 8th grounding through resistance, the first input end of described voltage comparator circuit is electrically connected between the 7th resistance and the 8th resistance, and described voltage stabilizing element provides described reference voltage for described voltage comparator circuit.
Further, it is a controllable accurate source of stable pressure that voltage stabilizing element described in protective circuit is filled with in above-mentioned counnter attack, and described reference voltage provides circuit also to comprise the 5th resistance.The plus earth of described controllable accurate source of stable pressure, the reference pole of described controllable accurate source of stable pressure is connected with the negative electrode of described controllable accurate source of stable pressure, and the negative electrode of described controllable accurate source of stable pressure is connected with described input circuit via described 5th resistance.The reference pole of described controllable accurate source of stable pressure is via the 7th resistance be connected in series and the 8th grounding through resistance, and the first input end of described voltage comparator circuit is electrically connected between the 7th resistance and the 8th resistance.
Further, described in above-mentioned counnter attack filling protective circuit, voltage comparator circuit also comprises a voltage comparator, the 3rd resistance, the 6th resistance and the 4th electric capacity.First input pin of described voltage comparator forms the first input end of described voltage comparator.Second input pin of described voltage comparator and described 6th resistance connect and compose the second input of described voltage comparator circuit.The output pin of described voltage comparator forms the output of described voltage comparator circuit.The output pin of described voltage comparator be connected described 3rd resistance between described second input pin, second input pin of described voltage comparator is also via described 6th resistance and described current sense resistor ground connection, and the output pin of described voltage comparator is via described 3rd resistance and described 4th capacity earth.
Further, described in above-mentioned counnter attack filling protective circuit, counnter attack filling control circuit also comprises the second resistance, the 4th resistance and the 3rd electric capacity.The grid of described P channel mosfet is via described second resistance and described triode ground connection, and described 4th resistance one end is via described 3rd capacity earth, and the other end of described 4th resistance is connected with the output of described voltage comparator circuit.The base stage of described triode is connected between described 4th resistance and described 3rd electric capacity.
Further, above-mentioned counnter attack is filled with in protective circuit, and described triode is NPN triode, and the first input end of described voltage comparator circuit is out-phase input, and described voltage comparator circuit second input is in-phase input end.
Further, above-mentioned counnter attack is filled with in protective circuit, and described triode is PNP triode, and the first input end of described voltage comparator circuit is in-phase input end, and described voltage comparator circuit second input is out-phase input.Further, above-mentioned counnter attack is filled with input circuit described in protective circuit and is comprised ac current source, rectification circuit and filter circuit, and described output circuit comprises external equipment.Described ac current source is connected with described rectification circuit, described rectification circuit is connected with described filter circuit, the direct-flow positive pole of the just very described rectification circuit of described input circuit, the negative pole of described input circuit is the direct current negative pole of described rectification circuit, the positive pole of the just very described external equipment of described output circuit, the negative pole of described output circuit is the negative pole of described external equipment.
Hinge structure, protective circuit is filled with in a kind of counnter attack, and it is electrically connected between an input circuit and an output circuit.This counnter attack is filled with protective circuit and is comprised: reference voltage provides circuit, voltage comparator circuit and counnter attack to fill with control circuit.Described voltage comparator circuit comprises current sense resistor.Described reference voltage provides the output of circuit to be connected with the first input end of described voltage comparator circuit.The negative pole of described input circuit is connected with described output circuit negative pole via described current sense resistor, described current sense resistor is formed the second input that back voltage acts on described voltage comparator circuit.Described counnter attack is filled with control circuit and is comprised a P channel mosfet, the first resistance, the first voltage-stabiliser tube and triode.The drain electrode of described P channel mosfet is connected with described input circuit positive pole, and the source electrode of described P channel mosfet is connected with the positive pole of described output circuit.Described first voltage-stabiliser tube is connected between the source electrode of described P channel mosfet and the grid of described P channel mosfet, and the positive pole of described first voltage-stabiliser tube is connected with the grid of described P channel mosfet, and described first resistance is in parallel with described first voltage-stabiliser tube.The grid of described P channel mosfet is via described triode ground connection, and the output of described voltage comparator circuit is connected with the base stage of described triode.Described voltage comparator circuit compares described reference voltage and described back voltage, controls described P channel mosfet operating state by the output of described voltage comparator circuit, prevents anti-electric current of filling with from entering described input circuit from described output circuit.The energy consumption that protective circuit is filled with in above-mentioned counnter attack produces primarily of described P channel mosfet and described current sense resistor; due to the dead resistance of described P channel mosfet and described current sense resistor resistance very little; therefore; the heat power consumption that the dead resistance and described current sense resistor of described P channel mosfet produce is very little, and hinge structure adopts diode to realize anti-anti-tank and greatly reduces heat power consumption.Efficiently solve in prior art the technical problem of the large and heat radiation difficulty of power consumption when adopting diode to realize anti-anti-tank.
Accompanying drawing explanation
In order to the clearer explanation embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the circuit diagram that in prior art, protective circuit is filled with in counnter attack;
Fig. 2 is the schematic diagram of the counnter attack filling protective circuit that the specific embodiment of the invention provides;
Fig. 3 is a kind of physical circuit figure of the counnter attack filling protective circuit that the specific embodiment of the invention provides.
Embodiment
Also by reference to the accompanying drawings the present invention is described in further detail below by specific embodiment.
With reference to Fig. 2, protective circuit 200 is filled with in counnter attack provided by the invention, and it is electrically connected between an input circuit 100 and an output circuit 300.This counnter attack is filled with protective circuit 200 and is comprised: reference voltage provides circuit 210, voltage comparator circuit 220 and counnter attack to fill with control circuit 230.Described voltage comparator circuit 220 comprises current sense resistor.Described reference voltage provides the output of circuit 210 to be connected with the first input end of described voltage comparator circuit 220.The negative pole of described input circuit 100 is connected with described output circuit 300 negative pole via described current sense resistor, described current sense resistor is formed the second input that back voltage acts on described voltage comparator circuit 220.
Described counnter attack is filled with control circuit 230 and is comprised a P channel mosfet, the first resistance R1, the first voltage-stabiliser tube Z1 and triode Q2.The drain electrode of described P channel mosfet is connected with described input circuit 100 positive pole, and the source electrode of described P channel mosfet is connected with the positive pole of described output circuit 300.Described first voltage-stabiliser tube Z1 is connected between the source electrode of described P channel mosfet and the grid of described P channel mosfet, and the positive pole of described first voltage-stabiliser tube Z1 is connected with the grid of described P channel mosfet, and described first resistance R1 is in parallel with described first voltage-stabiliser tube Z1.The grid of described P channel mosfet is via described triode Q2 ground connection, and the output of described voltage comparator circuit 220 is connected with the base stage of described triode Q2.Described voltage comparator circuit 220 compares described reference voltage and described back voltage, control described P channel mosfet operating state by the output of described voltage comparator circuit 220, prevent anti-electric current of filling with from entering described input circuit 100 from described output circuit 300.When there is not anti-filling phenomenon, because of the dead resistance of P channel mosfet and the resistance of current sense resistor R9 very little, when equal electric current passes through, the heat power consumption that P channel mosfet and current sense resistor R9 produce is less than the heat power consumption adopting diode to produce as counnter attack filling device.
Please also refer to Fig. 3, input circuit 100 comprises an ac current source, a rectification circuit and a filter circuit, rectification circuit adopts rectifier bridge BR1 to realize, filter circuit adopts the second electric capacity C2 to realize, the positive pole of the second electric capacity C2 connects the direct-flow positive pole of rectifier bridge BR1, the negative pole of the second electric capacity C2 connects the direct current negative pole of rectifier bridge BR1, and ac current source flows through rectifier bridge BR1 and the second electric capacity C2, obtains DC power supply.Output circuit comprises an external equipment, the positive pole of the just very external equipment of output circuit, and the negative pole of output current is the negative pole of external equipment.
Reference voltage provides circuit 210 to comprise: a controllable accurate source of stable pressure U2, the 5th resistance R5, the 7th resistance R7 and the 8th resistance R8, the plus earth of controllable accurate source of stable pressure U2, the negative electrode of controllable accurate source of stable pressure U2 is connected with the positive pole of DC power supply via the 5th resistance R5, the negative electrode of controllable accurate source of stable pressure U2 is also connected with the reference pole of controllable accurate source of stable pressure U2, can form a burning voltage V1 by above-mentioned connection on the negative electrode of controllable accurate source of stable pressure U2.The negative electrode of controllable accurate source of stable pressure U2 is connected to ground via the 7th resistance R7 and the 8th resistance R8.The output of controllable accurate source of stable pressure U2 is between the 8th resistance R8 and the 7th resistance R7.Can also arrange the 5th electric capacity C5 for filtering between the negative electrode and ground of controllable accurate source of stable pressure U2, also can be arranged in parallel with the 6th electric capacity C6 at the 8th resistance R8, the 6th electric capacity C6 is used for filtering.
Be appreciated that controllable accurate source of stable pressure can adopt voltage-stabiliser tube to substitute in other embodiments of the present invention.
Voltage comparator circuit 220 comprises integrated operational amplifier circuit U1, current sense resistor R9, the 3rd resistance R3 and the 6th resistance R6 of one or eight pins, the power end of integrated operational amplifier circuit U1 is connected with the positive pole of DC power supply, DC power supply is powered to integrated operational amplifier circuit U1, and integrated operational amplifier circuit U1 is normally worked.One just can also be comprised for filtering first electric capacity C1 between the power end and ground of integrated operational amplifier circuit U1.The earth terminal of integrated operational amplifier circuit U1 is connected to ground.First input pin of integrated operational amplifier circuit U1 is connected between the 8th resistance and the 7th resistance, and the first input pin (out-phase input pin) that the 8th ohmically dividing potential drop V1*R8/ (R7+R8) (reference voltage provides circuit 210 output end voltage) acts on integrated operational amplifier circuit U1 provides reference voltage for integrated operational amplifier circuit U1.Second input pin of integrated operational amplifier circuit U1 is by the 6th resistance R6 and current sense resistor R9 ground connection, and one end of current sense resistor R9 connects DC power cathode, and the other end of current sense resistor R9 is connected with output circuit negative pole.Electric current flows through current sense resistor R9 and forms back voltage, and back voltage acts on second input pin (homophase input pin) of integrated operational amplifier circuit U1 through the 6th resistance R6, forms positive feedback comparator.The output pin of integrated operational amplifier circuit U1 be connected the 3rd resistance R3 between the second input pin, form positive feedback hysteresis comparator, the antijamming capability to signal fluctuation can be strengthened.One the 4th electric capacity C4 can also be set between second input pin and ground of integrated operational amplifier circuit U1 and carry out High frequency filter.
First input pin of integrated operational amplifier circuit U1 forms the first input end (out-phase input) of described voltage comparator circuit 220.Second input pin of integrated operational amplifier circuit U1 and described 6th resistance R6 connect and compose second input (in-phase input end) of described voltage comparator circuit 220.The output pin of integrated operational amplifier circuit U1 forms the output of voltage comparator circuit 220.
Be appreciated that and comparator also can be adopted in other embodiments of the present invention to form above-mentioned positive feedback hysteresis comparator.
This counnter attack is filled with control circuit 230 and is comprised a P channel mosfet (in figure Q1), the first resistance R1, voltage stabilizing didoe Z1, NPN triode Q2, the second resistance R2 and the 4th resistance R4.The drain electrode of P channel mosfet is connected with the positive pole of DC power supply, and the source electrode of P channel mosfet is connected with the positive pole of output circuit.The drain electrode of P channel mosfet through the second resistance R2 and NPN triode Q2 ground connection, NPN triode Q2 grounded emitter.4th resistance R4 one end is connected with the output pin of integrated operational amplifier circuit U1, and the 4th resistance R4 other end is connected to ground via the 3rd electric capacity C3, and the base stage of NPN triode Q2 is connected between the 4th resistance R4 and the 3rd electric capacity C3.The first resistance R1 is connected with between the drain electrode and source electrode of P channel mosfet, first voltage-stabiliser tube Z1 is in parallel with the first resistance R1, the positive pole of the first voltage-stabiliser tube Z1 is connected with the drain electrode of P channel mosfet, and the negative pole of the first voltage-stabiliser tube Z1 is connected with the source electrode of P channel mosfet.
When there is not anti-filling electric current, the reference voltage that the back voltage acted on the current sense resistor R9 of second input of integrated operational amplifier circuit U1 is compared to for first input end is large, and the output of integrated operational amplifier circuit U1 exports high level.High level acts on the 3rd electric capacity C3 via the 4th resistance R4, voltage official post NPN triode Q2 conducting is produced at the 3rd electric capacity C3 two ends, electric current is had to make the source voltage of P channel mosfet be greater than drain voltage (equaling the voltage of the first voltage-stabiliser tube Z1) via the first resistance R1, the conducting of P channel mosfet, DC power anode electric current can output to output circuit 300 positive pole via P channel mosfet.
When exist anti-fill with electric current time, act on the reference voltage that the back voltage on the current sense resistor R9 of second input of integrated operational amplifier circuit U1 is compared to for first input end little, the output output low level of integrated operational amplifier circuit U1.Low level acts on the base stage of NPN triode Q2 via the 4th resistance R4, and NPN triode Q2 ends.Do not have electric current via the first resistance R1, the source voltage of P channel mosfet equals drain voltage, and P channel mosfet ends, and electric current can be prevented to be poured into input circuit 100 positive pole from output circuit 300 positive pole via P channel mosfet is counter.
Be appreciated that, in other specific embodiment of the present invention, when the back voltage on current sense resistor R9 acts on the first input end (out-phase input) of integrated operational amplifier circuit U1, when reference voltage acts on the second input (in-phase input end) of integrated operational amplifier circuit U1, triode Q2 also can adopt PNP triode to realize.
In above-mentioned anti-feedback circuit, main energy consumption produces primarily of described P channel mosfet and described current sense resistor R9, due to the dead resistance of described MOSFET and described current sense resistor R9 resistance very little.Such as: under square one (output current is 5A), suppose that the pressure drop of the counnter attack filling diode D1 in Fig. 1 is 0.4V, the dead resistance of described MOSFET is 5m Ω, and described current sense resistor R9 is 10m Ω.The heat power consumption of filling with on diode D1 in described counnter attack is P1=5A*0.4V=2W, the heat power consumption P2=5A*5A*5m Ω+5A*5A*10m Ω=0.375W in above-mentioned anti-feedback circuit.As can be seen here, the total heat power consumption dead resistance and described current sense resistor of described MOSFET produced can fill with the heat power consumption of diode generation much smaller than counnter attack.
In sum, described voltage comparator circuit is by comparing described reference voltage and described back voltage, control described P channel mosfet operating state by the output of described voltage comparator circuit, prevent anti-electric current of filling with from entering described input circuit from described output circuit.The above-mentioned counnter attack energy consumption of filling with protective circuit produces primarily of the MOSFET of described P raceway groove and described current sense resistor; due to the dead resistance of the MOSFET of described P raceway groove and described current sense resistor resistance very little; the heat power consumption that the dead resistance and described current sense resistor of the MOSFET of described P raceway groove produce is very little, and hinge structure adopts diode to realize anti-anti-tank and greatly reduces heat power consumption.
It should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the article of a series of key element or equipment not only comprises those key elements, but also comprise other key elements clearly do not listed.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within the article or equipment comprising described key element and also there is other identical element.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.It should be noted that: represent similar terms in similar label and letter accompanying drawing below, therefore, once be defined in an a certain Xiang Yi accompanying drawing, then do not need to define further it and explain in accompanying drawing subsequently.
Claims (10)
1. protective circuit is filled with in a counnter attack, it is electrically connected between an input circuit and an output circuit, it is characterized in that, this counnter attack is filled with protective circuit and is comprised: reference voltage provides circuit, circuit is filled with in voltage comparator circuit and counnter attack, described voltage comparator circuit comprises current sense resistor, described reference voltage provides the output of circuit to be connected with the first input end of described voltage comparator circuit, the negative pole of described input circuit is connected with described output circuit negative pole via described current sense resistor, described current sense resistor is formed the second input that back voltage acts on described voltage comparator circuit, described counnter attack is filled with circuit and is comprised a P channel mosfet, first resistance, first voltage-stabiliser tube and triode, the drain electrode of described P channel mosfet is connected with described input circuit positive pole, the source electrode of described P channel mosfet is connected with the positive pole of described output circuit, described first voltage-stabiliser tube is connected between the source electrode of described P channel mosfet and the grid of described P channel mosfet, the positive pole of described first voltage-stabiliser tube is connected with the grid of described P channel mosfet, described first resistance is in parallel with described first voltage-stabiliser tube, the grid of described P channel mosfet is via described triode ground connection, the output of described voltage comparator circuit is connected with the base stage of described triode, described voltage comparator circuit compares reference voltage and described back voltage, described P channel mosfet operating state is controlled by the output of described voltage comparator circuit, prevent anti-electric current of filling with from entering described input circuit from described output circuit.
2. protective circuit is filled with in counnter attack as claimed in claim 1; it is characterized in that: described reference voltage provides circuit to comprise a voltage stabilizing element, the 7th resistance and the 8th resistance; the negative electrode of described voltage stabilizing element is via the 7th resistance be connected in series and the 8th grounding through resistance; the first input end of described voltage comparator circuit is electrically connected between the 7th resistance and the 8th resistance, and described voltage stabilizing element provides described reference voltage for described voltage comparator circuit.
3. protective circuit is filled with in counnter attack as claimed in claim 2, it is characterized in that: described voltage stabilizing element is a controllable accurate source of stable pressure, described reference voltage provides circuit also to comprise the 5th resistance, the plus earth of described controllable accurate source of stable pressure, the reference pole of described controllable accurate source of stable pressure is connected with the negative electrode of described controllable accurate source of stable pressure, the negative electrode of described controllable accurate source of stable pressure is connected with described input circuit via described 5th resistance, the reference pole of described controllable accurate source of stable pressure is via the 7th resistance be connected in series and the 8th grounding through resistance, the first input end of described voltage comparator circuit is electrically connected between the 7th resistance and the 8th resistance.
4. protective circuit is filled with in counnter attack as claimed in claim 2, it is characterized in that: described voltage stabilizing element is a voltage-stabiliser tube.
5. protective circuit is filled with in counnter attack as claimed in claim 2, it is characterized in that: described voltage comparator circuit also comprises a voltage comparator, 3rd resistance, 6th resistance and the 4th electric capacity, first input pin of described voltage comparator forms the first input end of described voltage comparator circuit, second input pin of described voltage comparator and described 6th resistance connect and compose the second input of described voltage comparator circuit, the output pin of described voltage comparator forms the output of described voltage comparator circuit, the output pin of described voltage comparator be connected described 3rd resistance between described second input pin, second input pin of described voltage comparator is also via described 6th resistance and described current sense resistor ground connection, the output pin of described voltage comparator is via described 3rd resistance and described 4th capacity earth.
6. protective circuit is filled with in counnter attack as claimed in claim 5, it is characterized in that: described voltage comparator is an operational amplification circuit.
7. protective circuit is filled with in counnter attack as claimed in claim 5; it is characterized in that: described counnter attack is filled with circuit and also comprised the second resistance, the 4th resistance and the 3rd electric capacity; the grid of described P channel mosfet is via described second resistance and described triode ground connection; described 4th resistance one end is via described 3rd capacity earth; the other end of described 4th resistance is connected with the output of described voltage comparator circuit, and the base stage of described triode is connected between described 4th resistance and described 3rd electric capacity.
8. protective circuit is filled with in counnter attack as claimed in claim 7, and it is characterized in that: described triode is NPN triode, the first input end of described voltage comparator circuit is out-phase input, and the second input of described voltage comparator circuit is in-phase input end.
9. protective circuit is filled with in counnter attack as claimed in claim 7, and it is characterized in that: described triode is PNP triode, the first input end of described voltage comparator circuit is in-phase input end, and the second input of described voltage comparator circuit is out-phase input.
10. protective circuit is filled with in counnter attack as claimed in claim 1, it is characterized in that: described input circuit comprises ac current source, rectification circuit and filter circuit, described output circuit comprises external equipment, described ac current source is connected with described rectification circuit, described rectification circuit is connected with described filter circuit, the direct-flow positive pole of the just very described rectification circuit of described input circuit, the negative pole of described input circuit is the direct current negative pole of described rectification circuit, the positive pole of the just very described external equipment of described output circuit, the negative pole of described output circuit is the negative pole of described external equipment.
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| CN106301200A (en) * | 2016-08-30 | 2017-01-04 | 四川蜀旺新能源股份有限公司 | A kind of realize direct current with exchange counnter attack fill control device |
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| CN107819327A (en) * | 2016-09-13 | 2018-03-20 | 维谛技术有限公司 | A kind of ups power bypass is anti-to fill guard method |
| CN108565961A (en) * | 2018-06-11 | 2018-09-21 | 瑞纳智能设备股份有限公司 | There is one kind counnter attack to fill power supply automatic switchover without crushing output circuit |
| CN109478779A (en) * | 2016-07-19 | 2019-03-15 | Abb瑞士股份有限公司 | Ideal diode with active reverse-voltage protection |
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| WO2020191618A1 (en) * | 2019-03-26 | 2020-10-01 | 深圳欣锐科技股份有限公司 | Anti-backflow circuit, power supply and anti-backflow method |
| CN115021539A (en) * | 2022-08-09 | 2022-09-06 | 无锡力芯微电子股份有限公司 | Circuit structure for preventing current backflow |
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| CN201898330U (en) * | 2010-11-12 | 2011-07-13 | 无锡新茂科技有限责任公司 | Reverse-connection-preventive circuit |
| CN205141658U (en) * | 2015-11-18 | 2016-04-06 | 四川汇源光通信有限公司 | Prevent anti - protection circuit of irritating |
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| CN109478779A (en) * | 2016-07-19 | 2019-03-15 | Abb瑞士股份有限公司 | Ideal diode with active reverse-voltage protection |
| US11114838B2 (en) | 2016-07-19 | 2021-09-07 | Abb Schweiz Ag | Ideal diode with active reverse voltage protection |
| CN109478779B (en) * | 2016-07-19 | 2021-01-22 | Abb瑞士股份有限公司 | Ideal diode with active reverse voltage protection |
| CN106301200A (en) * | 2016-08-30 | 2017-01-04 | 四川蜀旺新能源股份有限公司 | A kind of realize direct current with exchange counnter attack fill control device |
| CN107819327A (en) * | 2016-09-13 | 2018-03-20 | 维谛技术有限公司 | A kind of ups power bypass is anti-to fill guard method |
| CN107819327B (en) * | 2016-09-13 | 2019-02-12 | 维谛技术有限公司 | A kind of ups power bypass is anti-to fill guard method |
| CN106533142A (en) * | 2016-10-18 | 2017-03-22 | 成都前锋电子仪器有限责任公司 | Anti-backflow circuit |
| CN108565961A (en) * | 2018-06-11 | 2018-09-21 | 瑞纳智能设备股份有限公司 | There is one kind counnter attack to fill power supply automatic switchover without crushing output circuit |
| WO2020191618A1 (en) * | 2019-03-26 | 2020-10-01 | 深圳欣锐科技股份有限公司 | Anti-backflow circuit, power supply and anti-backflow method |
| CN110380396A (en) * | 2019-08-19 | 2019-10-25 | 深圳市思榕科技有限公司 | A kind of quick self-adapted counnter attack protection circuit |
| CN115021539A (en) * | 2022-08-09 | 2022-09-06 | 无锡力芯微电子股份有限公司 | Circuit structure for preventing current backflow |
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