CN104578366A - Self-powered super capacitor energy-storage power source for detecting line faults - Google Patents

Self-powered super capacitor energy-storage power source for detecting line faults Download PDF

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Publication number
CN104578366A
CN104578366A CN201510002181.6A CN201510002181A CN104578366A CN 104578366 A CN104578366 A CN 104578366A CN 201510002181 A CN201510002181 A CN 201510002181A CN 104578366 A CN104578366 A CN 104578366A
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circuit
resistance
super capacitor
diode
self
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CN104578366B (en
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刘健
刘树林
张小庆
付善
赵树仁
张志华
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State Grid Corp of China SGCC
Xian University of Science and Technology
Electric Power Research Institute of State Grid Shaanxi Electric Power Co Ltd
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State Grid Corp of China SGCC
Xian University of Science and Technology
Electric Power Research Institute of State Grid Shaanxi Electric Power Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/345Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Protection Of Static Devices (AREA)

Abstract

The invention discloses a self-powered super capacitor energy-storage power source for detecting line faults. The self-powered super capacitor energy-storage power source comprises a rectifying circuit, a pre-charging and by-pass switch circuit, a two-way controllable switch circuit, a charging and discharging control circuit, a super capacitor, an overvoltage control and driving circuit and a reference circuit. The rectifying circuit and the pre-charging and by-pass switch circuit are connected between a current transformer and a fault detecting device and are used for providing power output. The two-way controllable switch circuit is connected with the pre-charging and by-pass switch circuit and is used for controlling the super capacitor to be charged and discharged. The charging and discharging control circuit is connected with the two-way controllable switch circuit and is used for controlling the two-way controllable switch circuit to be connected and disconnected. The super capacitor is connected with the charging and discharging control circuit and the two-way controllable switch circuit and is used for energy storage. The overvoltage control and driving circuit is connected between the pre-charging and by-pass switch circuit and the reference circuit and is used for conducting overvoltage protecting control and driving. The input end of the reference circuit is connected to the pre-charging and by-pass switch circuit, and the output end of the reference circuit is connected with the charging and discharging control circuit and the overvoltage control and driving circuit. The self-powered super capacitor energy-storage power source can stably operate in line fault detection for a long time.

Description

A kind of self-powered super capacitor energy-storing power supply detected for line fault
Technical field
The invention belongs to line fault detection field, particularly a kind of self-powered super capacitor energy-storing power supply detected for line fault.
Background technology
Be applied to the DC power supply that transmission line malfunction detects at present, usually have following several mode: 1. directly use lithium battery group or storage battery as the power supply of line fault testing device; 2. solar panel and Combined storage battery is used to power; 3. adopt current transformer from power taking a cable line, and being aided with storage battery or lithium battery energy storage battery, to realize power supply uninterrupted.But these traditional modes requiring the long-life, the application scenario such as highly reliable all has problems.Mode 1. in pure adopt lithium battery or storage battery power supply, so can reduce the size of line fault testing device, efficient and conveniently to come into operation, but to there is useful life short for lithium battery and storage battery, and lithium battery and accumulator property influenced by environmental temperature.2. mode adopts solar panel and storage battery, its can meet be operated in for a long time not needs external power supply when, environmental protection and energy saving, but solar panel and storage battery make the size of line fault testing device greatly increase, and solar panel conversion efficiency affects larger by factors such as weather, weather, environment, and storage battery itself to there is useful life short, charge-discharge performance temperature influence.3. mode utilizes current transformer from power taking a cable line, and being aided with storage battery or lithium battery energy storage battery, to realize power supply uninterrupted, this mode and mode 1. 2. compared with, take into account size and the useful life of failure detector, before being, the two is incomparable, is also current modal occupation mode.
But the electric current of the high voltage bus of current transformer primary side is very little during normal work, even if under occurring that line fault produces transient high-current situation, charging and discharging currents due to storage battery and lithium battery can not be too large etc. problem, storage battery or lithium battery cannot obtain enough energy, under the state that will be in electric discharge for a long time, have that useful life is short, power density is low, these defects of discharge performance temperature influence.
Therefore for requiring long-life, highly reliable application scenario, use traditional mode 1. 2. 3. etc. power supply just have some limitations.
Summary of the invention
The object of the invention is to provide a kind of self-powered super capacitor energy-storing power supply detected for line fault, detects Problems existing in self powered supply to solve existing line fault.
To achieve these goals, the present invention adopts following technical scheme:
A kind of self-powered super capacitor energy-storing power supply detected for line fault, comprise rectification circuit, connect with rectification circuit for providing power supply to export and the precharge of overvoltage protection and bypass switching circuit, with precharge and the two-way two-way gate-controlled switch circuit for energy storage discharge and recharge connected of bypass switching circuit, connect with two-way gate-controlled switch circuit for controlling the charge-discharge control circuit that the conducting of bidirectional switch pipe turns off, connect for the super capacitor of charging energy-storing with two-way gate-controlled switch circuit, connect with precharge and bypass switching circuit for crossing mistake pressure-controlled that pressure-controlled and controlling drives and controlling drive circuit, with cross pressure-controlled and control the two reference circuits for generation of reference voltage that drive circuit and charge-discharge control circuit connect.
Preferably, the input of described rectification circuit connects current transformer.
Preferably, rectification circuit is made up of rectifier bridge, after precharge and bypass switching circuit thereof are connected to rectification circuit; Precharge and bypass switching circuit thereof comprise diode D1, bypass enhancement mode PMOS switch pipe Q2, dividing potential drop sampling resistor R3, dividing potential drop sampling resistor R4, electrochemical capacitor C1; V+ and the V-two ends of rectifier bridge also meet bypass enhancement mode PMOS switch pipe Q2; The V+ end of rectifier bridge connects the anode of diode D1, and the negative electrode of diode D1 connects the anode of electrochemical capacitor C1, between the negative electrode that electrochemical capacitor C1 is attempted by diode D1 and ground; In parallel component pressure sampling resistor R3, R4 after diode D1; Precharge and bypass switching circuit thereof provide the voltage VCC at the two ends of taking from electrochemical capacitor C1 to two-way gate-controlled switch circuit, cross pressure-controlled and drive circuit, charge-discharge control circuit and reference circuit, also provide output voltage VO to failure detector simultaneously.
Preferably, two-way gate-controlled switch circuit comprises enhancement mode PMOS switch pipe Q1, drives resistance R1 and triode VT1; The source S of switching tube Q1 is connected with the anode of electrochemical capacitor C1, and drain D connects the anode of super capacitor, the collector electrode of grid G connecting triode VT1, drives resistance R1 to be connected between the grid source electrode of switching tube Q1, and the emitter-base bandgap grading of triode VT1 connects ground; The negativing ending grounding of super capacitor.
Preferably, pressure-controlled and Drive and Control Circuit thereof comprise overvoltage detection control circuit and drive circuit excessively; Overvoltage detection control circuit is made up of resistance R2, R5 pressure sampling circuit being attempted by electrochemical capacitor C1 two ends; Drive circuit comprises integrated operational amplifier U1, resistance R7 and resistance R9; By resistance R7, output is fed back to inverting input by integrated operational amplifier U1 and form negative feedback, resistance R2 and R5 is attempted by super capacitor two ends, dividing potential drop gathers the voltage V2 at super capacitor two ends to the in-phase end of U1, compares the drive control signal defined PMOS switch pipe Q2 with reference voltage V ref.
Preferably, charge-discharge control circuit comprises integrated transporting discharging U2, resistance R6, resistance R8, resistance R10, resistance R11, resistance R13, diode D3, diode D4, electric capacity C3 and integrated transporting discharging U4; The inverting input that integrated transporting discharging U2 and integrated transporting discharging U4 feeds back to integrated transporting discharging U2, U4 by resistance R8 and electric capacity C2, resistance R11 and electric capacity C3 from respective output respectively forms negative feedback, and the in-phase end input of integrated transporting discharging U2 is the voltage V1 by divider resistance R3 and resistance R4 dividing potential drop gained; The backward end of integrated transporting discharging U2 entered proportion resistor R10 by reference voltage Vref and inputted, and the in-phase end input of integrated transporting discharging U4 is V1 equally, and backward end input is by the V2 of the resistance R2 and R5 dividing potential drop gained being attempted by super capacitor two ends; The negative electrode of diode D4 is connected with the output of integrated transporting discharging U2, diode D4 anode is connected with the output of integrated transporting discharging U4 by resistance R6, the anode of diode D3 is connected with the anode of diode D4, the negative electrode of diode D3 is connected to the base stage of the triode VT1 in major loop, provides drive singal.
Preferably, reference circuit comprises benchmark U3, current-limiting resistance R12 and electric capacity C4; The negative electrode of benchmark U3 connects the anode of the electrochemical capacitor C1 in pre-charge circuit and bypass switching circuit through current-limiting resistance R12, plus earth, and reference edge and negative electrode connect and export the benchmark Vref of whole power supply, reference edge through an electric capacity C4 to carry out filtering.
Relative to prior art, the present invention has following beneficial effect: the present invention is after line failure, and circuit will produce transient high-current, and the electric energy that circuit taken from by current transformer is charged to pre-charge circuit by rectification circuit, then charges to super capacitor.Super capacitor stores enough energy within the of short duration time, and after line fault causes tripping operation power-off, super capacitor can discharge reverses through pre-charge circuit, provides enough electric energy to maintain the normal work of external testing circuit.Usually, during there is line fault (only tens mS), super capacitor has stored and enough can provide required electric energy to failure detector circuit.So, when not needing additional power source to power, the analog circuit of simple and stable is adopted to realize precharging circuit and super capacitor charge and discharge control, existing line fault can be overcome and detect Problems existing in the middle of self powered supply, play an important role in the application improving line fault detection self powered supply.Under normal circumstances, line current is less, and the self-powered super capacitor energy-storing power supply that this line fault detects and line fault testing device can be in resting state.
A kind of self-powered super capacitor energy-storing power supply detected for line fault of the present invention has that stored energy is large, charging current is large, speed is fast, service life cycle is long, power density is high, ultralow temperature characteristic is good and the plurality of advantages such as environmental protection, and the transient high-current that proposition utilizes line fault to produce on mode basis 3. can realize super capacitor fast charging energy storage.Compared to storage battery and lithium battery, super capacitor has lower series equivalent resistance, longer useful life, wider temperature working range, wider voltage change range, the advantage such as non-maintaining.
The present invention is when exporting when line failure, the electric current flowing through circuit increases rapidly, by current transformer power taking through rectification circuit make the voltage of pre-charge circuit very fast rise to preset value, externally can provide VCC, two-way gate-controlled switch circuit is opened super capacitor and is started charging energy-storing subsequently.After line fault causes switch trip, super capacitor starts electric discharge, provides required electric energy to pre-charge circuit and other checkout equipments.When not needing to provide additional power source, can be stable run on for a long time in the middle of line fault detection, realizes detecting self-powered requirement to line fault.
Accompanying drawing explanation
Fig. 1 is the self powered supply theory diagram of fault detect;
Fig. 2 is the schematic diagram of fault detect self powered supply circuit.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Refer to shown in Fig. 1, a kind of self-powered super capacitor energy-storing power supply detected for line fault of the present invention, the self powered supply circuit of fault detect is connected between current transformer and super capacitor, comprise rectification circuit 1, connect with rectification circuit 1 for provide power supply to export and overvoltage protection be precharge and bypass switching circuit 2, with precharge and the two-way two-way gate-controlled switch circuit 3 for energy storage discharge and recharge connected of bypass switching circuit 2, connect with two-way gate-controlled switch circuit 3 for controlling the charge-discharge control circuit 5 that the conducting of bidirectional switch pipe turns off, connect with two-way gate-controlled switch circuit 3 is super capacitor 7 for charging energy-storing, connect with precharge and bypass switching circuit 2 for crossing mistake pressure-controlled that pressure-controlled and controlling drives and controlling drive circuit 4, with cross pressure-controlled and control the two reference circuits 6 for generation of reference voltage that drive circuit 4 and charge-discharge control circuit 5 connect.While precharging circuit and bypass switching circuit 2 provide VCC to two-way gate-controlled switch circuit 3, mistake pressure-controlled and drive circuit 4, charge-discharge control circuit 5, reference circuit 6, also externally failure detector provides output voltage.
When circuit breaks down, the electric current flowing through circuit increases rapidly, the electric energy of circuit is taken from by instrument transformer, become direct current through rectification circuit 1 to charge to precharge and bypass switching circuit 2, the voltage of pre-charge circuit raises, when being elevated to preset value, charge-discharge control circuit 5 action makes the conducting of two-way gate-controlled switch circuit 3 to super capacitor 7 charging energy-storing.Cause precharge and bypass switching circuit 2 voltage drop thereof when line short fault causes during tripping operation power-off, super capacitor 7 in support power supply discharges, to reference circuit 6 and other failure detector circuit energy supplies to pre-charge circuit 2 by two-way gate-controlled switch circuit 3.Cross pressure-controlled and control drive circuit 4 for driving precharge by-pass switch road 2, prevent because super capacitor 7 charging voltage is too high and damage.
As Fig. 2 provides the circuit diagram of fault detect self powered supply circuit of the present invention; Whole circuit is divided into 7 parts: rectification circuit 1, precharge and bypass switching circuit 2, two-way gate-controlled switch circuit 3, excessively pressure-controlled and control drive circuit 4, charge-discharge control circuit 5, reference circuit 6, super capacitor 7.Concrete connection is: current transformer takes from the electric energy of circuit after rectifier bridge BRIGER1, and connect bypass enhancement mode nmos switch pipe Q2 (such as IRF640), be connected in series a diode D1, in parallel component pressure sampling resistor R3, R4 and other electrochemical capacitor C1 after diode D1, this part constitutes precharge and bypass switching circuit 2.Precharge and bypass switching circuit 2 supplying power for outside VCC, be supplied to integrated transporting discharging U1, U2, U4 and benchmark U3 (TL431).Enhancement mode PMOS (such as IRF9540) switching tube Q1 is connected in series after precharge and bypass switching circuit 2, component pressure sampling resistor R2, a R5 has been met after switching tube Q1, be connected to one between the grid source electrode of switching tube Q1 and drive resistance R1, the source S of switching tube Q1 is connected with the anode of electrochemical capacitor C1, drain D connects the anode of super capacitor 7 (sc), the negativing ending grounding of super capacitor 7; The collector electrode of what the grid of enhancement mode PMOS switch pipe Q1 connected the is triode VT1 of a NPN type (such as 8050), the emitter grounding of triode VT1, this part constitutes two-way gate-controlled switch circuit 3.The base drive signal of triode VT1 is by the output of integrated transporting discharging U2 (such as LM358) and the output of integrated transporting discharging U4 (such as LM358) and connect and provide.Integrated transporting discharging U2 and integrated transporting discharging U4 is respectively by resistance R8, electric capacity C2 and resistance R11, the inverting input that electric capacity C3 feeds back to integrated transporting discharging from respective output forms negative feedback, the in-phase end input of integrated transporting discharging U2 is the V1 by the resistance R3 in major loop and R4 dividing potential drop gained, reverse input is reference voltage Vref, the in-phase end input of integrated transporting discharging U4 is V1 equally, and backward end input is the V2 by the divider resistance R2 in major loop and R5 dividing potential drop gained; The negative electrode of diode D4 is connected with the output of integrated transporting discharging U2, anode is connected with the output of integrated U4 by resistance R6, the anode of diode D3 is connected with the anode of diode D4, the negative electrode of diode D3 is connected to the base stage of the NPN type triode VT1 in major loop, there is provided drive singal, this part is charge-discharge control circuit 5.Integrated transporting discharging U1 (such as LM358) feeds back to inverting input through resistance R7 from output and forms a negative feedback, the V2 of the in-phase end input gained that is by major loop and connecting resistance R2 and R5 dividing potential drop are sampled, backward end input is then reference voltage Vref, the drive singal of the nmos switch pipe Q2 that what output provided is then in major loop, this part constituted pressure-controlled and controlled drive circuit 4.The VCC provided by pre-charge circuit is connected to the negative electrode of benchmark U3 (TL431) by serial connection current-limiting resistance R12, the plus earth of benchmark U3, reference edge tieback is to the output of anode tap as reference voltage, export Vref, reference edge carries out filtering with receiving by an electric capacity C4 in addition, and this part is reference circuit 6.The drain electrode of what the anode of ultracapacitor 7 connected is enhancement mode switching tube Q1, what negative terminal connected is ground, is the energy storage for power supply that whole line fault detects self powered supply.Be exactly more than self powered supply 7 parts of fault detect.
Operation principle for the self-powered super capacitor energy-storing power supply that line fault detects: self-powered super capacitor energy-storing power supply the present invention being used for line fault detection, when line failure is not before causing tripping operation power-off, the electric current flowing through circuit increases rapidly, the electric energy on circuit is taken from through current transformer, after full-wave rectification BRIGR1, charge first to precharge and bypass switching circuit 1 by diode D1, now the voltage at electrochemical capacitor C1 two ends raises, charging is initial, the in-phase end of integrated transporting discharging U2 is less than the reference voltage Vref of backward end by the voltage V1 of gained of sampling, the in-phase end input voltage V1 of integrated transporting discharging U4 is higher than end of oppisite phase input voltage V2, so the output voltage of integrated transporting discharging U2 reduces, integrated transporting discharging U4 output voltage raises, the now first conducting of diode D4, the anode potential of diode D3 is dragged down, thus make triode NPN be operated in cut-off state, PMOS switch pipe Q2 not conducting, super capacitor does not charge, after the magnitude of voltage of pre-charge circuit exceedes preset value, the in-phase end voltage V1 of integrated transporting discharging U2 is higher than the reference voltage Vref of backward end, the in-phase end voltage V1 of integrated transporting discharging U4 is higher than end of oppisite phase voltage V2, integrated transporting discharging U2 output voltage raises, the voltage that integrated transporting discharging U4 exports also raises, now diode D4 ends, diode D3 conducting, triode VT1 is operated in amplification region (will be operated in saturation region subsequently), PMOS switch pipe Q2 starts conducting gradually, start to charge to super capacitor.Along with the conducting of PMOS switch pipe Q2 is by the access of super capacitor, the source potential VCC of PMOS is dragged down, now integrated transporting discharging U2 output voltage reduces, the voltage of integrated transporting discharging U4 raises, diode D4 conducting will be there is, diode D3 anode potential drags down, clamped at about 1V, now VT1 will be operated in cut-off region, switching tube Q1 not conducting, the voltage at the electrochemical capacitor C1 two ends of pre-charge circuit like this raises, will again from newly making integrated transporting discharging U2 output voltage raise, the output voltage of U4 raises, diode D4 not conducting, diode D3 conducting, triode VT1 will be operated in saturation region, switching tube Q1 is from new conducting, charge to super capacitor.Two-way gate-controlled switch circuit is in a dynamic charging process.Form operational amplifier by U1 in addition and form an overvoltage crowbar, now output voltage is not enough to driving switch pipe Q2 conducting.The voltage of pre-charge circuit and super capacitor continues to rise; when the magnitude of voltage at super capacitor two ends is increased beyond preset value; sampled voltage V2 will higher than Vref; now integrated transporting discharging output voltage raises; U1 output voltage now raises and makes nmos switch pipe Q2 conducting; the short circuit after switching tube Q2, protect super capacitor, thus realize overvoltage protection.After circuit breaks down and causes switch trip, need to provide energy to failure detector circuit, certainly will decline causing the current potential of the electrochemical capacitor C1 of pre-charge circuit, super capacitor starts, to pre-charge circuit back discharge, to provide enough energy to failure detector circuit.

Claims (7)

1. the self-powered super capacitor energy-storing power supply detected for line fault, it is characterized in that, comprise rectification circuit (1), connect with rectification circuit (1) for providing power supply to export and the precharge of overvoltage protection and bypass switching circuit (2), with precharge and the two-way two-way gate-controlled switch circuit (3) for energy storage discharge and recharge connected of bypass switching circuit (2), connect with two-way gate-controlled switch circuit (3) for controlling the charge-discharge control circuit (5) that the conducting of bidirectional switch pipe turns off, connect with two-way gate-controlled switch circuit (3) for the super capacitor (7) of charging energy-storing, connect with precharge and bypass switching circuit (2) for crossing mistake pressure-controlled that pressure-controlled and controlling drives and controlling drive circuit (4), with cross pressure-controlled and control the two reference circuits (6) for generation of reference voltage that drive circuit (4) and charge-discharge control circuit (5) connect.
2. a kind of self-powered super capacitor energy-storing power supply detected for line fault according to claim 1, is characterized in that, the input of described rectification circuit (1) connects current transformer.
3. a kind of self-powered super capacitor energy-storing power supply detected for line fault according to claim 1, it is characterized in that, rectification circuit (1) is made up of rectifier bridge, after precharge and bypass switching circuit (2) thereof are connected to rectification circuit (1); Precharge and bypass switching circuit (2) thereof comprise diode D1, bypass enhancement mode PMOS switch pipe Q2, dividing potential drop sampling resistor R3, dividing potential drop sampling resistor R4, electrochemical capacitor C1; V+ and the V-two ends of rectifier bridge also meet bypass enhancement mode PMOS switch pipe Q2; The V+ end of rectifier bridge connects the anode of diode D1, and the negative electrode of diode D1 connects the anode of electrochemical capacitor C1, between the negative electrode that electrochemical capacitor C1 is attempted by diode D1 and ground; In parallel component pressure sampling resistor R3, R4 after diode D1; Precharge and bypass switching circuit (2) thereof provide the voltage VCC at the two ends of taking from electrochemical capacitor C1 to two-way gate-controlled switch circuit (3), cross pressure-controlled and drive circuit (4), charge-discharge control circuit (5) and reference circuit (6), also provide output voltage VO to failure detector simultaneously.
4. a kind of self-powered super capacitor energy-storing power supply detected for line fault according to claim 3, is characterized in that, two-way gate-controlled switch circuit (3) comprises enhancement mode PMOS switch pipe Q1, drives resistance R1 and triode VT1; The source S of switching tube Q1 is connected with the anode of electrochemical capacitor C1, drain D connects the anode of super capacitor (7), the collector electrode of grid G connecting triode VT1, drives resistance R1 to be connected between the grid source electrode of switching tube Q1, and the emitter-base bandgap grading of triode VT1 connects ground; The negativing ending grounding of super capacitor (7).
5. a kind of self-powered super capacitor energy-storing power supply detected for line fault according to claim 3, it is characterized in that, pressure-controlled and Drive and Control Circuit (4) thereof comprise overvoltage detection control circuit and drive circuit excessively; Overvoltage detection control circuit is made up of resistance R2, R5 pressure sampling circuit being attempted by electrochemical capacitor C1 two ends; Drive circuit comprises integrated operational amplifier U1, resistance R7 and resistance R9; By resistance R7, output is fed back to inverting input by integrated operational amplifier U1 and form negative feedback, resistance R2 and R5 is attempted by super capacitor two ends, dividing potential drop gathers the voltage V2 at super capacitor two ends to the in-phase end of U1, compares the drive control signal defined PMOS switch pipe Q2 with reference voltage V ref.
6. a kind of self-powered super capacitor energy-storing power supply detected for line fault according to claim 5, it is characterized in that, charge-discharge control circuit (5) comprises integrated transporting discharging U2, resistance R6, resistance R8, resistance R10, resistance R11, resistance R13, diode D3, diode D4, electric capacity C3 and integrated transporting discharging U4; The inverting input that integrated transporting discharging U2 and integrated transporting discharging U4 feeds back to integrated transporting discharging U2, U4 by resistance R8 and electric capacity C2, resistance R11 and electric capacity C3 from respective output respectively forms negative feedback, and the in-phase end input of integrated transporting discharging U2 is the voltage V1 by divider resistance R3 and resistance R4 dividing potential drop gained; The backward end of integrated transporting discharging U2 entered proportion resistor R10 by reference voltage Vref and inputted, and the in-phase end input of integrated transporting discharging U4 is V1 equally, and backward end input is by the V2 of the resistance R2 and R5 dividing potential drop gained being attempted by super capacitor two ends; The negative electrode of diode D4 is connected with the output of integrated transporting discharging U2, diode D4 anode is connected with the output of integrated transporting discharging U4 by resistance R6, the anode of diode D3 is connected with the anode of diode D4, the negative electrode of diode D3 is connected to the base stage of the triode VT1 in major loop, provides drive singal.
7. a kind of self-powered super capacitor energy-storing power supply detected for line fault according to claim 6, it is characterized in that, reference circuit (6) comprises benchmark U3, current-limiting resistance R12 and electric capacity C4; The negative electrode of benchmark U3 connects the anode of the electrochemical capacitor C1 in pre-charge circuit and bypass switching circuit (2) through current-limiting resistance R12, plus earth, reference edge and negative electrode connect and export the benchmark Vref of whole power supply, reference edge through an electric capacity C4 to carry out filtering.
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