CN208209504U - A kind of single-phase active arc extinguishing type short-circuit protection - Google Patents

Abstract

The utility model discloses a kind of single-phase active arc extinguishing type short-circuit protections; it is related to breaker technical field; since the reaction that common short-circuit protector turns off circuit is slower; its key points of the technical solution are that including IGBT circuit: being connected on power grid, circuit where load can be cut off in time when short circuit occurs in load；First sample circuit: being connected in IGBT circuit both ends and samples to the voltage value in IGBT circuit；First sample circuit exports sampled voltage in real time；Comparison circuit: sampled voltage is compared by the sampled voltage for connecting the second sample circuit and exporting in response to the second sample circuit, the comparison circuit with a reference value, exports high level signal when sampled voltage is higher than a reference value；Driving circuit: connection comparison circuit and the high level signal in response to comparison circuit then control IGBT circuit and are turned off.Reach when short circuit occurs for load, the technical effect that IGBT circuit can rapidly switch off.

Description

A kind of single-phase active arc extinguishing type short-circuit protection

Technical field

The utility model relates to breaker technical fields, more specifically, it relates to a kind of single-phase active arc extinguishing type short circuit Protective device.

Background technique

Breaker can not only connect in a power distribution system with disjunction normal duty electric current, can also disconnect short trouble electricity Stream can timely and effectively cut off short trouble, ensure safe and stable operation of power system.

Traditional breaker is disconnected electric supply system by mechanical switch automatic trip in short circuit, due to its internal machine The inherent characteristic of tool switch, the time for power supply system of cutting off the power is longer, usually in a few tens of milliseconds between hundreds of milliseconds, because Short circuit place contact resistance is small, and the electric current for easily leading to current supply circuit increased dramatically, the temperature of current supply circuit conductor steeply rises, short-circuit Point generates very strong dangerous arc spark, and the high temperature and arc electrode generated is easy to cause fire or electric shock and other safety accidents.

The electric current in the second sample circuit of current sensor for thering is active arc extinguishing type short-circuit protection to use at present, then Digitial controller is provided data to, the method for short circuit is judged whether to realize by operation, but this scheme drawback is electric current For sensor there are conversion time, program operation needs the time, from be shorted to cutting power supply need dozens or even hundreds of microsecond when Between, so how to shorten from the reaction time for being shorted to cutting is a problem to be solved.

Utility model content

The purpose of the utility model is to provide a kind of single-phase active arc extinguishing type short-circuit protection, have short in load generation The purpose that Lu Shi, IGBT circuit can rapidly switch off.

The above-mentioned technical purpose of the utility model has the technical scheme that

A kind of single-phase active arc extinguishing type short-circuit protection, it is characterised in that: including IGBT circuit: being connected on power grid, Circuit where load can be cut off in time when short circuit occurs in load；First sample circuit: it is connected in IGBT circuit both ends and right Voltage value in IGBT circuit is sampled；First sample circuit exports sampled voltage in real time；Comparison circuit: connection second Sample circuit and the sampled voltage exported in response to the second sample circuit, the comparison circuit carry out sampled voltage and a reference value Compare, exports high level signal when sampled voltage is higher than a reference value；Driving circuit: comparison circuit is connected and in response to comparing The high level signal of circuit then controls IGBT circuit and is turned off.

By using above scheme, when loading normal work, IGBT circuit is equivalent to access, and electric current can smoothly flow through, When load because voltage is excessive and when occurring short-circuit, voltage signal is transferred to comparison circuit in time by the second sample circuit, and with The preset value of comparator is compared in comparison circuit, if the collected voltage signal of the second sample circuit is greater than preset value, Comparison circuit issues high level signal to control circuit, and control circuit controls the shutdown of IGBT circuit, to protect circuit, will need When overhauling to IGBT circuit, driving circuit can be issued a signal to by micro-processor interface circuit, driving circuit controls IGBT electricity Road shutdown, the shutdown mode of this IGBT circuit reacts relatively slow, isolation circuit can by the weak current part of micro-processor interface circuit with Control circuit and comparison circuit separate, and prevent micro-processor interface circuit from burning out because electric current is excessive.

Preferably, the comparison circuit includes the comparator of model TLV3501, the with comparator No. two pins coupling 30 capacitors and the end OFF coupled with No. three pins of comparator；No. seven pins connection power supply of comparator, the two of the comparator Number pin meets a reference value Vref1, is connected with chip control circuit and voltage input circuit on No. three pins of the comparator；Institute Stating the first sample circuit includes the 6th diode and the 13rd diode that cathode is connected to IGBT circuit both ends, and described The anode of six diodes and the 13rd diode is coupled with the input terminal of voltage input circuit.

By using above scheme, voltage is come in by No. three pins input of comparator, the voltage signal inputted into It is compared with Vref1, preset Vref1 is less than by the voltage that voltage input circuit conveying comes when load works normally Value, comparator issue low level signal；It is greater than preset value when being transported to the voltage value in comparator by voltage delivery circuit Vref1, comparator is defeated to determine high level signal, and the protection to load is realized in control IGBT circuit shutdown.

Preferably, the chip control circuit and voltage input circuit are parallel with one another；The chip control circuit includes the 70 diodes, respectively the 26th resistance and the 27th resistance with the coupling of two input terminals of the 70th diode, institute No. three pins of the output end and comparator of stating the 70th diode couple.

By using above scheme, electrostatic protective function is played to voltage input circuit by the 70th diode, is prevented Only electrostatic makes semiconductor devices be damaged by semiconductor components and devices.

Preferably, being connected with the second sample circuit on the IGBT circuit, second sample circuit can acquire load The electric current and voltage signal at both ends, second sample circuit connect micro-processor interface circuit；Second sample circuit include with it is defeated Enter the 90th resistance, one end and concatenated 89th resistance of the 90th resistance and the 92nd resistance of power grid end Lin coupling The 9th resistance that concatenated 91st resistance and both ends are coupled with the 91st resistance and the 89th resistance respectively, described the It is in series with the 12nd two-way TVS pipe on nine resistance, the 12nd two-way TVS pipe, the 9th electricity are in series on the 9th resistance The both ends of resistance are coupled respectively at output end VOL- and output end VOL+, and output end VOL- connects load with output end VOL+.9th The both ends of resistance are coupled respectively at output end VOL- and output end VOL+；The chip control circuit includes and micro-processor interface circuit is electric The 87th resistance and anode and concatenated 21st diode of the 87th resistance of connection, the 21st diode It is coupled with No. three pins of comparator.

By using above scheme, cooperated by the 91st resistance, the 9th resistance and the 89th resistance in power grid Electric current and voltage signal sampled, the current value and voltage value at the 9th resistance both ends pass through output end VOL- and output end VOL+ is exported, and is transferred in comparison circuit, and the 92nd resistance connects the voltage that can be measured with the 91st resistance more Greatly, the 90th resistance and the 89th resistance string are capable of increasing the measurement range of voltage, in overtension, the 12nd in conjunction with sample Two-way TVS pipe conducting, to play the role of protection to circuit, chip control circuit can control comparator shutdown.

Preferably, the IGBT circuit includes the 8th diode, the collector and the of cathode and input power grid end Lin coupling The 9th 2 pole that the second insulated gate bipolar transistor, the anode of the cathode coupling of eight diodes are coupled with the 8th diode cathode 4th insulated gate bipolar transistor of the cathode coupling of pipe, collector and the 9th diode, the anode of the 8th diode It is grounded with the anode of the 9th diode, the emitter and the 4th insulated gate bipolar of second insulated gate bipolar transistor The emitter of transistor is coupled and is grounded；Second insulated gate bipolar transistor and the 4th insulated gate bipolar transistor Gate pole is respectively coupled to one end of the tenth two-way TVS pipe and the 11st two-way TVS pipe, the tenth two-way TVS pipe and the 11st The other end of two-way TVS pipe is grounded.

By using above scheme, in normal work, electric current is issued double by the second insulated gate by input power grid end Lin Power grid is flowed back in bipolar transistor, the 9th diode and load, and when electric current is reversed, electric current is through overload, the 4th insulated gate bipolar Transistor npn npn and the 8th diode flow back to power grid, and the tenth two-way TVS pipe and the 11st two-way TVS pipe can prevent IGBT circuit electric Height is pressed through, IGBT circuit over-voltage breakdown can be made in this way, damages IGBT circuit.

Preferably, being connected with isolation circuit between the micro-processor interface circuit and driving circuit, the isolation circuit includes light Electric coupler and the frequency selection circuit coupled with photoelectrical coupler；The frequency selection circuit includes the 51st capacitor, one end and photoelectricity Coupler ride on Bus No. 11 pin coupling the 20th resistance and the 21st resistance, the both ends of the 51st capacitor respectively with The coupling of the other end of 20th resistance and the 21st resistance；The driving circuit includes that base stage and the 20th resistance couple NPN triode and PNP triode, the collector coupling of the emitter of the NPN triode and PNP triode and the two it Between coupled with the control terminal of IGBT circuit；The micro-processor interface circuit includes micro-chip processor, and the micro-chip processor can receive Manual input signals are to export high level signal to driving circuit.

By using above scheme, photoelectrical coupler can keep apart micro-processor interface circuit and driving circuit, prevent from driving Forceful electric power in dynamic circuit enters the micro-chip processor in micro-processor interface circuit and burning out micro-processor interface circuit, is compared by frequency selection circuit Signal herein is transferred to compared with device to carry out selecting wave, avoids generating accidentally short-circuit protection phenomenon.

Preferably, it is in series with current amplification circuit and voltage amplifier circuit between the micro-processor interface circuit and IGBT circuit, The voltage amplifier circuit includes the 7 of the positive input coupling of the first amplifier of model LF353D, the first amplifier 68th resistance of the output end coupling of 12 resistance, one end and the first amplifier, one end are another with the 68th resistance Hold the 43rd capacitor of coupling, the other end ground connection of the 43rd capacitor.

By using above scheme, carried out by the voltage signal that will come from IGBT circuit transmission by the first amplifier Amplification to being transmitted on micro-processor interface circuit, the 43rd capacitor can clutter in filtering circuit, guarantee the steady of transmission signal It is qualitative.

Preferably, the 91st two-way TVS pipe is parallel on the 43rd capacitor, the 91st two-way TVS The both ends of pipe are coupled with the both ends of the 43rd capacitor respectively, are connected between the 43rd capacitor and the 68th resistance 52nd resistance, the 52nd resistor in parallel have the 51st two-way TVS pipe, the 52nd resistance and the 6th Power end is connected between 18 resistance.

By using above scheme, by the 51st two-way TVS pipe and the 91st two-way TVS pipe to voltage amplification Circuit plays the role of overload protection, when the voltage at voltage amplifier circuit both ends is excessive, the 51st two-way TVS pipe and the 9th 11 two-way TVS pipes can be connected in time and then prevent the first amplifier from burning out.

Preferably, the current amplification circuit include the second amplifier of model LF353D and with the second amplifier just The 44th resistance, the 42nd resistance and the 42nd with the output end coupling of the second amplifier coupled to input terminal 40th capacitor of concatenated 41st resistance of resistance and one end and the coupling of the 41st resistance, the 40th capacitor it is another One end ground connection.

By using above scheme, the current signal transmitted from comparator enters after passing through the 44th resistance Second amplifier amplifies, and is then transferred in driving circuit by the output end of the second amplifier, and capacitor can filter out electricity Clutter in current amplifier guarantees the stability of signal outflow.

Preferably, the 44th resistance is in series with protection circuit, the protection electricity far from one end of the second amplifier Road includes the 71st resistance with the 70th resistance of the 44th resistance coupling and with the coupling of the 44th resistance, and described the The other end of 70 resistance and the 71st resistance ground connection.

By using above scheme, by right in the 70th resistance of the 44th resistor in parallel and the 71st resistance Current amplifier electric current plays the role of protection, and when current is excessive, the 70th resistance and the 71st resistance can consume circuit In one part of current and play the role of protection to current amplification circuit.

In conclusion the utility model has the following beneficial effects:

1. the utility model is compared collected signal in the second sample circuit by comparing electric current, then pass through Driving circuit goes control IGBT circuit shutdown, to play the role of short-circuit protection to load；

2. the utility model the voltage value acquired in the second sample circuit is compared with preset value Vref1 so that it is determined that Whether load is short-circuit, and then determines whether to turn off in IGBT circuit；

3. the utility model carries out electrostatic protection to voltage input circuit by the 70th diode, electrostatic is prevented in turn Semiconductor components and devices is set to be damaged in semiconductor components and devices.

Detailed description of the invention

Fig. 1 is IGBT electrical block diagram in embodiment；

Fig. 2 is the second sample circuit structural schematic diagram in embodiment；

Fig. 3 is comparison circuit structural schematic diagram in embodiment；

Fig. 4 is isolation circuit and driving circuit structure sterogram in embodiment；

Fig. 5 is micro-chip processor structural schematic diagram in embodiment；

Fig. 6 is Simple oxhorn holder structure schematic diagram in embodiment；

Fig. 7 is short-circuit signal circuit and normal signal electrical block diagram in embodiment；

Fig. 8 is voltage amplifier circuit structural schematic diagram in embodiment；

Fig. 9 is current amplification circuit structural schematic diagram in embodiment.

In figure, 1, IGBT circuit；D8, the 8th diode；D9, the 9th diode；Q2, the second insulated gate bipolar crystal Pipe；Q4, the 4th insulated gate bipolar transistor；D11, the tenth two-way TVS pipe；D11, the 11st two-way TVS pipe；2, the second sampling Circuit；R9, the 9th resistance；R89, the 89th resistance；R90, the 90th resistance；R91, the 91st resistance；R92, the 90th Two resistance；D12, two-way TVS pipe；3, comparison circuit；31, chip control circuit；R87, the 89th resistance；D21, the 21st Diode；32, voltage input circuit；R26, the 26th resistance；R27, the 27th resistance；R28, the 28th resistance； BAV70, the 70th diode；T1, comparator；C30, the 30th capacitor；R29, the 29th resistance；4, driving circuit；Q6, NPN triode；Q7, PNP triode；5, isolation circuit；51, frequency selection circuit；T4, photoelectrical coupler；R20, the 20th resistance； R21, the 21st resistance；C51, the 51st capacitor；52, normal signal circuit；R18, the 18th resistance；D22, the 22nd Light emitting diode；53, short-circuit signal circuit；D23, the 23rd light emitting diode；R19, the 19th resistance；C18, the 18th electricity Hold；C19, the 19th capacitor；6, micro-processor interface circuit；J8, Simple oxhorn seat；7, voltage amplifier circuit；R51, the 51st resistance； R52, the 52nd resistance；R62, the 62nd resistance；R63, the 63rd resistance；R64, the 64th resistance；R65, the 6th 15 resistance；R68, the 68th resistance；R72, the 72nd resistance；T2, the first amplifier；C43, the 43rd capacitor； D51, two-way TVS pipe；D91, two-way TVS pipe；71, current amplification circuit；R40, the 40th resistance；R41, the 41st resistance； R42, the 42nd resistance；R43, the 43rd resistance；R44, the 44th resistance；R70, the 70th resistance；R71, the 70th One resistance；T3, the second amplifier；C40, the 40th capacitor；C48, the 48th capacitor；P11, socket.

Specific embodiment

The utility model is described in further detail below in conjunction with attached drawing.The wherein identical attached drawing of identical components Label indicates.It should be noted that word "front", "rear" used in the following description, "left", "right", "up" and "down" refer to It is the direction in attached drawing, word " bottom surface " and " top surface ", "inner" and "outside" are referred respectively to towards or away from particular elements geometry The direction at center.

Embodiment: a kind of single-phase active arc extinguishing type short-circuit protection, including IGBT circuit 1(are as shown in Figure 1), second adopt Sample circuit 2(is as shown in Figure 2), comparison circuit 3(it is as shown in Figure 3), driving circuit 4(it is as shown in Figure 4), isolation circuit 5(such as Fig. 4 It is shown) and micro-processor interface circuit 6(it is as shown in Figure 7).IGBT circuit 1 is connected on power grid firewire and and load in series；Second sampling Circuit 2 is electrically connected with IGBT circuit 1；Comparison circuit 3 is electrically connected with IGBT circuit 1；The input terminal and output end of driving circuit 4 point It is not electrically connected with isolation circuit 5 and IGBT circuit 1；Isolation circuit 5 is set between micro-processor interface circuit 6 and driving circuit 4.

As shown in Figure 1, IGBT circuit 1 includes the 8th diode D8, the 9th diode D9, the second insulated gate bipolar crystal Pipe Q2, the 4th insulated gate bipolar transistor Q4, two-way TVS pipe Q10 and two-way TVS pipe Q11.The cathode of 8th diode D8 with Input power grid end Lin coupling, the cathode of the 9th diode D9 and output loading end Lout are coupled, the anode of the 8th diode D8 with The anode of 9th diode D9 is coupled and is grounded.

Input power grid end Lin is power grid firewire, and input power grid end Lout is grid zero line.Second insulated gate bipolar crystal The collector of pipe Q2 and input power grid end Lin coupling, the collector of the 4th insulated gate bipolar transistor Q4 and input load end The emitter of Lout coupling, the second insulated gate bipolar transistor Q2 and the 4th insulated gate bipolar transistor Q4 are coupled and are connect It is two-way that the gate pole of ground, the second insulated gate bipolar transistor Q2 and the 4th insulated gate bipolar transistor Q4 are separately connected the tenth The other end of TVS pipe D10 and the 11st two-way TVS pipe D11, the tenth two-way TVS pipe D10 and the 11st two-way TVS pipe D11's is another One end couples and is grounded.

When the input of power grid forward direction, electric current passes through the second insulated gate bipolar transistor Q2, the 9th diode D9 and load Power grid is flowed back to, is at this time backward voltage between the collector and gate pole of the 4th insulated gate bipolar transistor Q4, so shutdown；When When power grid reversely inputs, electric current flows back to power grid through overload, the 4th insulated gate bipolar transistor Q4 and the 8th diode D8, this When the 4th insulated gate bipolar transistor Q4 collector and gate pole between be forward voltage, so conducting, the second insulated gate are double Bipolar transistor Q2 is also similarly.When load goes wrong and causes the electric current at the both ends IGBT excessively high, the tenth two-way TVS pipe The two-way TVS pipe D11 conducting of D10 and the 11st, to play the role of overload protection to IGBT circuit 1.Input power grid end Lin with The cathode of the 6th diode D6 and the 13rd diode D13, the 6th diode D6 and the 13rd are separately connected on output loading end The anode of diode D13 is separately connected input terminal DESAT-U and input terminal DESAT-D, such input terminal DESAT-U and input terminal DESAT-D receives the voltage signal in circuit and voltage signal can be passed to comparison circuit 3.

As depicted in figs. 1 and 2, the second sample circuit 2 includes the 92nd resistance R92, the 91st resistance R91, the 9th Ten resistance R90, the 89th resistance R89, the 9th resistance R9 and the 12nd two-way TVS pipe D12.The one of 92nd resistance R92 It connects with input power grid end Nin coupling, the 91st resistance R91 with the 92nd resistance R92 at end；The one of 90th resistance R90 It connects with input power grid end Lin coupling, the 89th resistance R89 with the 90th resistance R90 at end；Distinguish at the both ends of 9th resistance R9 One end and the 89th resistance R89 with the 91st resistance R91 far from the 92nd resistance R92 is far from the 90th resistance R90 One end coupling；12nd two-way TVS pipe D12 is in parallel with the 9th resistance R9 and its both ends both ends with the 9th resistance R9 respectively Coupling, the both ends of the 9th resistance R9 respectively with connect load end VOL- and load end VOL+, the both ends of the 9th resistance R9 respectively with Output loading end Lout and output loading end Nout coupling.

When such load short circuits, the voltage at the 9th both ends resistance R9 can also change accordingly, such 9th resistance R9 The potential value of 1 other end of potential value and IGBT circuit on firewire passes through input terminal DESAT-U and input terminal DESAT-D respectively It enters in comparison circuit 3.92nd resistance R92 and the 91st resistance R91, the 90th resistance R90 and the 89th electricity Series connection can guarantee that the second sample circuit 2 is able to bear higher voltage value, series connection the 12nd on the 9th resistance R9 between resistance R89 Two-way TVS pipe D12 impedance can be reduced and be connected when the voltage of the second sample circuit 2 is excessive, be played to the second sample circuit 2 The effect of protection.

As shown in figure 3, comparison circuit 3 includes comparator T1, chip control circuit 31, voltage input circuit 32 and the 30th Capacitor C30.The model TLV3501 of comparator T1, voltage input circuit 32 and chip control circuit 31 are with comparator T1's No. three pin couplings, one end of the 30th capacitor C30 and No. two pins of comparator T1 couple, and the 30th capacitor C30's is another No. two pins of end ground connection, comparator T1 are equipped with preset value Vref1.No. four pins of comparator are grounded, and the six of comparator T1 Number pin connects the end OFF, is parallel with the 29th resistance R29 on the end OFF, the 29th end resistance R29 connection DESAT is compared No. seven pins of device T1 connect power supply, No. eight pins ground connection of comparator T1.The port DESAT can monitor the second sampling electricity in real time Road 2(is as shown in Figure 2) voltage signal that passes over, and it is as shown in Figure 4 these signals can be passed to driving circuit 4(), The end OFF connects micro-processor interface circuit 6.

Voltage input circuit 32 include the 70th diode BAV70, the 26th resistance R26, the 27th resistance R27 and One end of 28th resistance R28, the 26th resistance R26 and the 27th resistance R27 are separately connected the 70th diode No. three pins of two input terminals of BAV70, the output end of resistance BAV70 and comparator T1 couple, the 26th resistance R26 and The other end of 27th resistance R27 connects power supply.One end of 28th resistance R28 and No. three pin couplings of comparator T1 It connects, other end ground connection.Chip control circuit 31 include the 87th resistance R87 and the 21st diode D21, the 21st The cathode of diode D21 and No. three pins of comparator T1 couple, one end of the 87th resistance R87 and the 21st diode The anode coupling of D21, another termination port S_OFF.Compared in this way by the 70th diode BAV70 to prevent electrostatic from entering In device T1, and then play the role of electrostatic protection to comparator T1, the 21st diode D21 can prevent electric current reversed.When from When the voltage of input terminal DESAT-U and input terminal DESAT-D input is excessive, the end OFF issues signal, micro- place to micro-processor interface circuit 6 It manages circuit 6 and comparator T1 shutdown is controlled by port S_OFF.

As shown in figure 4, isolation circuit 5 and the coupling of driving circuit 4 are arranged, isolation circuit 5 is photoelectrical coupler T4 and frequency-selecting Circuit 51, the No.1 pin of photoelectrical coupler T4 connect input terminal IGBT CTRL, No. two pins of photoelectrical coupler T4, No. four pipes Foot, No. eight pins and ten No. six pins are grounded, and No. three pins of photoelectrical coupler T4 connect positive pole, can give photoelectric coupling Device T4 powers, and the 19th capacitor C19, the other end ground connection of the 19th capacitor C19 are coupled on No. three pins of photoelectrical coupler T4.

No. five pins of photoelectrical coupler T4 connect output end IGBT RESET, and No. six pins of photoelectrical coupler T4 connect defeated No. nine pins and No. ten pins of outlet IGBT Error, photoelectrical coupler T4 connect power supply negative potential, and the ten of photoelectrical coupler T4 No. two pins and ten No. three pins connect power supply positive potential, and power supply positive potential and power supply negative potential, which cooperate, supplies photoelectrical coupler T4 Electricity.Ten No. four pins of photoelectrical coupler T4 connect the 18th capacitor C18, No. 14 pins ground connection of photoelectrical coupler T4, photoelectricity Input terminal DESAT, the ride on Bus No. 11 pin coupling of frequency selection circuit 51 and photoelectrical coupler T4 are connected on ten No. four pins of coupler T4 It connects.

Frequency selection circuit 51 includes the 20th resistance R20, the 21st resistance R21 and the 51st capacitor C51.20th electricity The ride on Bus No. 11 pin of one end and photoelectrical coupler T4 for hindering R20 and the 21st resistance R21 couples, the 20th resistance R20 and the The other end of 21 resistance R21 is coupled respectively at the both ends of the 51st capacitor C51, the 51st capacitor C51 and the 20th One end of one resistance R21 coupling connects negative potential.

Pass through the 20th resistance R20, the 21st resistance R21 and the respectively from the signal that photoelectrical coupler T4 is exported in this way The cooperation filtering clutter of the concatenated 51st capacitor C51 of 20 resistance R20 guarantees that the signal exported from input terminal DESAT is true For the low level signal in 51 output area of frequency selection circuit generated because of load short circuits, guarantee the accurate of output signal Degree.

Driving circuit 4 includes NPN triode Q6 and PNP triode Q7.The collector of NPN triode Q6 connects power supply positive electricity Gesture, the emitter of PNP triode Q7 connect power supply negative potential, the emitter of NPN triode Q6 and the collector of PNP triode Q7 Coupling.The positive potential at NPN triode Q6 and the both ends PNP triode Q7 and negative potential cooperation make to be input to low level signal herein A closed circuit can be constituted with the second insulated gate bipolar transistor Q2 and the 4th insulated gate bipolar transistor Q4 cooperation, Low level signal herein is input to after frequency selection circuit 51 by the output end of NPN triode Q6, then in turn through second Then the gate pole and emitter of insulated gate bipolar transistor Q2 passes through the 9th diode D9 to the 4th insulated gate bipolar crystal The collector of pipe Q4 accommodates backward voltage between the gate pole and collector of the 4th insulated gate bipolar transistor Q4 in this way, therefore And the 4th insulated gate bipolar transistor Q4 is turned off, so that IGBT circuit 1 be turned off.

As shown in Figure 3 and Figure 5, micro-processor interface circuit 6 is micro-chip processor STM32F405RG, micro-chip processor 30 No. three pins and 30 No. four pins of STM32F405RG respectively with the end input terminal S_OFF of resistance and comparator T1 The end the OFF coupling of No. six pins, such micro-chip processor STM32F405RG can control comparator T1 by 30 No. three pins Shutdown.

As shown in Figure 5 and Figure 6, Simple oxhorn seat J8, simple ox are connected between photoelectrical coupler T4 and micro-processor interface circuit 6 It is all connected with power supply between the No.1 pin of angled seat J8 and No. two pins, for powering to micro-processor interface circuit 6, Simple oxhorn seat J8's No. three pins and No. four pins are grounded, No. five pins and No. six pins of Simple oxhorn seat J8 respectively with micro-chip processor The bus end U1_USART_TX of 40 No. two pins of the STM32F405RG and bus port U1_USART_ of 40 No. three pins RX coupling.

No. seven pins of Simple oxhorn seat J8 and the No.1 pin IGBT CTRL of photoelectrical coupler T4 are coupled, and work as micro process Chip STM32F405RG to when the input signal of photoelectrical coupler T4 is 1, open, and works as micro-chip processor by control IGBT circuit 1 To when the input signal of photoelectrical coupler T4 is 0, photoelectrical coupler T4 controls IGBT circuit 1 and turns off STM32F405RG.

As shown in Figure 6 and Figure 7, No. nine pins of Simple oxhorn seat J8 are with photoelectrical coupler T4(with reference to No. five pipes of Fig. 4) Foot coupling, No. ten pins of Simple oxhorn seat J8 and No. six pins of photoelectrical coupler T4 couple.No. seven of Simple oxhorn seat J8 Normal signal circuit 52 is connected between pin and No. three pins, normal signal circuit 52 includes the 18th resistance R18 and second One end of 12 light emitting diode D22, the 18th resistance R18 and No. seven pins of Simple oxhorn seat J8 couple, the 18th resistance The anode of the other end of R18 and the 22nd light emitting diode D22 couple, the cathode of the 22nd light emitting diode D22 and letter No. three pins coupling of easy toggle switch J8, when IGBT circuit 1 operates normally, the 22nd light emitting diode D22 green light, electricity By between No. nine pins and No. three pins of Simple oxhorn seat J8, the 22nd light emitting diode D22's stream shines indication circuit It operates normally.

Short-circuit signal circuit 53, short-circuit signal circuit are connected between No. ten pins and No. two pins of Simple oxhorn seat J8 53 include the 19th resistance R19 and diode D23, one end of the 19th resistance R19 and No. ten pin couplings of Simple oxhorn seat J8 It connects, the other end of the 19th resistance R19 and the cathode of the 23rd light emitting diode D23 couple, the 23rd light emitting diode The anode of D23 is coupled with No. two pins of Simple oxhorn seat J8, and the 23rd light emitting diode D23 can glow.In this way when When short circuit occurs for load, Simple oxhorn device J8 issues signal by No. six pins of photoelectrical coupler T4, Simple oxhorn device J8's It is powered between No. ten pins and No. two pins, the 23rd light emitting diode D23 is lighted and then issued feux rouges, for reminding correlation Personnel.

As shown in Figure 8 and Figure 9, IGBT circuit 1(is connected with electricity with reference between Fig. 1) and micro-chip processor STM32F405RG Press amplifying circuit 7 and current amplification circuit 71, voltage amplifier circuit 7 includes the first amplifier T2, the 65th resistance R65, the 65 resistance R65 and the 52nd resistance R52.The model LF353D of first amplifier T2, the one of the 65th resistance R65 End and the positive input of the first amplifier T2 couple, and the other end of the 65th resistance R65 is sequentially connected in series the 64th resistance R64, the 63rd resistance R63 and the 62nd resistance R62, the other end of the 62nd resistance R62 connect the 9th resistance R9(ginseng Examine Fig. 2) close to one end of the 89th resistance R89, such 64th resistance R64, the 63rd resistance R63 and the 62nd Resistance R62 can play the role of forceful electric power protection to micro-chip processor STM32F405RG, prevent micro-chip processor STM32F405RG is burnt, the one end of the 65th resistance R65 far from the first amplifier T2 positive input because electric current is excessive It is coupled with the 72nd resistance R72, the other end ground connection of the 72nd resistance R72 further protects circuit.

The coupling of the output end of the negative input of first amplifier T2 and the first amplifier T2, the 68th resistance R68's One end and the first amplifier T2 are coupled, and the other end of the 68th resistance R68 and the 52nd resistance R52 are coupled, and the 52nd The other end of resistance R52 and ten No. four pins of micro-chip processor STM32F405RG couple, and collect in this way from the 9th resistance R9 Voltage signal by passing to micro-chip processor STM32F405RG, micro-chip processor after the first amplifier T2 amplification STM32F405RG can connect display and show the voltage signal over the display.

The 51st resistance R51, the 51st electricity are connected between 68th resistance R68 and the 52nd resistance R52 The other end and the 52nd resistance R52 for hindering R51 close to one end of output end are connected with the 51st two-way TVS pipe D51, and the 5th Power supply is connected between 11 resistance R51 and the 51st two-way TVS pipe D51, for supplying to micro-chip processor STM32F405RG Electricity.51st two-way TVS pipe D51 is connected with the 43rd capacitor C43, and the other end of the 43rd capacitor C43 is grounded, and the 5th 11 two-way TVS pipe D51 connect the 91st two-way TVS pipe D91, the 91st two-way TVS pipe D91 close to one end of output end Both ends respectively with the both ends of the 43rd capacitor C43 couple.Such 91st two-way TVS pipe D91 and the 51st is two-way When the voltage at the both ends TVS pipe D51 is excessive, the impedance of the 91st two-way two-way TVS pipe D51 of TVS pipe D91 and the 51st is reduced And be connected, play the role of protection to circuit.43rd capacitor C43 being capable of clutter in filtering circuit.

Current amplification circuit 71 includes the second amplifier T3, the 44th resistance R44, the 42nd resistance R42 and the 4th 11 resistance R41.The model LF353D of second amplifier T3, one end of the 44th resistance R44 and the second amplifier T3's Positive input coupling, the other end of the 44th resistance R44 connect one end of the close input power grid end Lin of the 9th resistance R9, 44th resistance R44 is connected with the 70th resistance R70 and the 71st resistance R71 far from one end of the second amplifier T3, the The other end of 70 resistance R70 and the 71st resistance R71 is grounded, such 70th resistance R70 and the 71st resistance R71 The protection that overload protection is played to current amplification circuit 71 prevents the electric current in circuit excessive.

44th resistance R44 is also connected with socket P11, the No.1 pipe of socket P11 far from one end of the second amplifier T3 Foot and the 44th resistance R44 are coupled, and are connected with earthing power supply GND VCC between No. two pins and No. three pins of socket P11, It can power to current amplification circuit 71, the 48th capacitor C48 of filtering is parallel on earthing power supply GND VCC.

The negative input and output end of second amplifier T3 couples, the 42nd resistance R42 and the 41st resistance R41 It connects and the output end of the other end of the 42nd resistance R42 and the second amplifier T3 couples, the 41st resistance R41's is another One end connects ten No. five pins coupling of micro-chip processor STM32F405RG, the 42nd resistance R42 and the 41st resistance The 40th resistance R40, another termination power of the 40th resistance R40, for micro-chip processor are connected between R41 STM32F405RG power supply, the 41st resistance R41 are connected with the 40th capacitor C40, the 40th capacitor close to the side of output end The other end of C40 is grounded, and such 40th capacitor C40 can filter out clutter present in current amplification circuit 71, be input to micro- The current signal for handling chip STM32F405RG is relatively stable, the current signal energy that micro-chip processor STM32F405RG is received It is enough transmitted on display and is shown.

It is as follows that equation is embodied:

In this way when short circuit occurs in load, there is obvious become in the voltage at the 9th both ends resistance R9 on the second sample circuit 2 Change, then passes through input terminal DESAT_U and input terminal DESAT_D for IGBT circuit 1 together with the potential at the both ends of the 9th resistance R9 Signal passes to comparison circuit 3, and then the average value of input terminal DESAT_U and input terminal DESAT_D potential is transmitted to comparator It is compared in T1 with preset value Vref1, if preset value Vref1 is smaller, comparator T1 passes through photoelectrical coupler T4 transmitting letter Number to being compared in driving circuit 4, such driving circuit 4 controls IGBT circuit 1 and turns off, pass through in this way comparator T1 ratio compared with After directly control the shutdown of IGBT circuit 1, reaction is very fast.

When needing to overhaul IGBT circuit 1, micro-chip processor STM32F405R is issued towards Simple oxhorn seat J8 Signal is controlled, the IGBT CTRL signal of No. seven pins of Simple oxhorn seat J8 becomes 0, and then signal is transmitted to the control of driving circuit 4 IGBT circuit 1 processed turns off, and the reaction of such driving circuit 4 is slower, but can control at any time by artificially, in IGBT circuit 1 Electric current and voltage signal pass through current amplification circuit 71 respectively and voltage amplifier circuit 7 is transported to micro-chip processor STM32F405R, micro-chip processor STM32F405R can connect display screen for current status and voltage status real-time display aobvious Facilitate the electric current and voltage change of monitoring circuit in display screen.

This specific embodiment is only the explanation to the utility model, is not limitations of the present invention, ability Field technique personnel can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but As long as all by the protection of Patent Law in the scope of the claims of the utility model.

Claims (10)

1. a kind of single-phase active arc extinguishing type short-circuit protection, it is characterised in that:

Including IGBT circuit (1): being connected on power grid, circuit where load can be cut off in time when short circuit occurs in load；

First sample circuit: being connected in IGBT circuit (1) both ends and samples to the voltage value in IGBT circuit (1)；Described One sample circuit exports sampled voltage in real time；

Comparison circuit (3): connection the second sample circuit (2) and the sampled voltage exported in response to the second sample circuit (2), it is described Sampled voltage is compared by comparison circuit (3) with a reference value, exports high level signal when sampled voltage is higher than a reference value；

Driving circuit (4): connection comparison circuit (3) and in response to the high level signal of comparison circuit (3) then controls IGBT Circuit (1) is turned off.

2. a kind of single-phase active arc extinguishing type short-circuit protection according to claim 1, it is characterised in that:

The comparison circuit (3) includes the comparator (T1) of model TLV3501, the with the coupling of comparator (T1) No. two pins 30 capacitors (C30) and the end OFF coupled with No. three pins of comparator (T1)；No. seven pins of comparator (T1) connect power supply, No. two pins of the comparator (T1) meet a reference value Vref1, are connected with chip control on No. three pins of the comparator (T1) Circuit (31) processed and voltage input circuit (32)；First sample circuit includes that cathode is connected to IGBT circuit (1) two 6th diode (D6) and the 13rd diode (D13) at end, the 6th diode (D6) and the 13rd diode (D13) Anode is coupled with the input terminal of voltage input circuit (32).

3. a kind of single-phase active arc extinguishing type short-circuit protection according to claim 2, it is characterised in that:

The chip control circuit (31) and voltage input circuit (32) are parallel with one another；

The voltage input circuit (32) include the 70th diode (BAV70), respectively with the 70th diode (BAV70) two The 26th resistance (R26) and the 27th resistance (R27) of a input terminal coupling, the 70th diode (BAV70) No. three pins of output end and comparator (T1) couple.

4. a kind of single-phase active arc extinguishing type short-circuit protection according to claim 3, it is characterised in that: the IGBT electricity It is connected on road (1) the second sample circuit (2), second sample circuit (2) can acquire the electric current and voltage at load both ends Signal, second sample circuit (2) connect micro-processor interface circuit (6)；Second sample circuit (2) include and input power grid end 90th resistance (R90) of Lin coupling and concatenated 89th resistance (R89) of the 90th resistance (R90) and input power grid Hold the 92nd resistance (R92) and concatenated 91st resistance (R91) of the 92nd resistance (R92) and the both ends of Nin coupling The 9th resistance (R9) coupled respectively with the 91st resistance (R91) and the 89th resistance (R89), the 9th resistance (R9) On be in series with the 12nd two-way TVS pipe (D12), the both ends of the 9th resistance (R9) respectively with output end VOL- and output end VOL+ coupling, output end VOL- connect load with output end VOL+；

The chip control circuit (31) include the 87th resistance (R87) being electrically connected with micro-processor interface circuit (6) and anode with 87th concatenated 21st diode (D21) of resistance (R87), the 21st diode (D21) and comparator (T1) No. three pins coupling.

5. a kind of single-phase active arc extinguishing type short-circuit protection according to claim 1, it is characterised in that:

The IGBT circuit (1) includes the 8th diode (D8), the collector and the eight or two of cathode and input power grid end Lin coupling The second insulated gate bipolar transistor (Q2), anode and the anode coupling of the 8th diode (D8) of the cathode coupling of pole pipe (D8) 4th insulated gate bipolar transistor (Q4) of the cathode coupling of the 9th diode (D9), collector and the 9th diode (D9), The anode of 8th diode (D8) is grounded with the anode of the 9th diode (D9), the second insulated gate bipolar crystal The emitter of the emitter and the 4th insulated gate bipolar transistor (Q4) of managing (Q2) is coupled and is grounded；

The gate pole of second insulated gate bipolar transistor (Q2) and the 4th insulated gate bipolar transistor (Q4) is respectively coupled to There are one end of the tenth two-way TVS pipe (Q10) and the 11st two-way TVS pipe (Q11), the tenth two-way TVS pipe (Q10) and the tenth The other end of one two-way TVS pipe (Q11) is grounded.

6. a kind of single-phase active arc extinguishing type short-circuit protection according to claim 4, it is characterised in that: the micro process Be connected between circuit (6) and driving circuit isolation circuit (5), the isolation circuit (5) include photoelectrical coupler (T4) and with The frequency selection circuit (51) of photoelectrical coupler (T4) coupling；

The frequency selection circuit (51) includes the ride on Bus No. 11 pin coupling of the 51st capacitor (C51), one end and photoelectrical coupler (T4) The 20th resistance (20) connect and the 21st resistance (21), the both ends of the 51st capacitor (C51) are respectively with described The coupling of the other end of 20 resistance (20) and the 21st resistance (21)；

The driving circuit (4) includes the NPN triode (Q6) and PNP triode of base stage and the coupling of the 20th resistance (20) (Q7), the emitter of the NPN triode (Q6) and the collector of PNP triode (Q7) coupling and between the two with IGBT electricity The control terminal on road (1) couples；

The micro-processor interface circuit (6) includes micro-chip processor (STM32F405RG), the micro-chip processor (STM32F405RG) Manual input signals can be received to export high level signal to driving circuit (4).

7. a kind of single-phase active arc extinguishing type short-circuit protection according to claim 1, it is characterised in that: the IGBT electricity The input terminal of current amplification circuit (71) and voltage amplifier circuit (7), institute are in series between road (1) and the second sample circuit (2) It states current amplification circuit (71) and connects micro-processor interface circuit (6), the voltage amplifier circuit with the output end of voltage amplifier circuit (7) (7) the 70th for including the first amplifier (T2) of model LF353D, being coupled with the positive input of the first amplifier (T2) Two resistance (R72), the 68th resistance (R68) and the 68th resistance with the output end coupling of the first amplifier (T2) (R68) the 43rd capacitor (R43) of other end coupling, the other end ground connection of the 43rd capacitor (R43).

8. a kind of single-phase active arc extinguishing type short-circuit protection according to claim 7, it is characterised in that: the described 40th The 91st two-way TVS pipe (D91), the both ends point of the 91st two-way TVS pipe (D91) are parallel on three capacitors (R43) It is not coupled with the both ends of the 43rd capacitor (R43), between the 43rd capacitor (R43) and the 68th resistance (R68) It is connected with the 52nd resistance (R52), the 51st two-way TVS pipe (D51) is parallel on the 52nd resistance (R52), Power end is connected between 52nd resistance (R52) and the 68th resistance (R68).

9. a kind of single-phase active arc extinguishing type short-circuit protection according to claim 7, it is characterised in that: the electric current is put Big circuit (71) includes the second amplifier (T3) of model LF353D and couples with the positive input of the second amplifier (T3) The 44th resistance (R44), coupled with the output end of the second amplifier (T3) the 42nd resistance (R41), with the 40th The capacitor (C40) of concatenated 41st resistance (R41) of two resistance (R41) and one end and the coupling of the 41st resistance (R41), institute State the other end ground connection of capacitor (C40).

10. a kind of single-phase active arc extinguishing type short-circuit protection according to claim 9, it is characterised in that: the described 4th 14 resistance (R44) are in series with protection circuit far from the one end of the second amplifier (T3), and the protection circuit includes one end and the 70th resistance (R70) of 44 resistance (R44) coupling and the 71st resistance coupled with the 44th resistance (R44) (R71), the other end of the 70th resistance (R70) and the 71st resistance (R71) is grounded.