CN110445091A - A kind of single-phase arc extinguishing type short-circuit protector - Google Patents
A kind of single-phase arc extinguishing type short-circuit protector Download PDFInfo
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- CN110445091A CN110445091A CN201810416832.XA CN201810416832A CN110445091A CN 110445091 A CN110445091 A CN 110445091A CN 201810416832 A CN201810416832 A CN 201810416832A CN 110445091 A CN110445091 A CN 110445091A
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- 238000011897 real-time detection Methods 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 59
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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Abstract
The invention discloses single-phase arc extinguishing type short-circuit protectors; belong to breaker technical field; its key points of the technical solution are that including the IGBT circuit being connected between power grid end and output loading end; the IGBT circuit includes: load blocks; load blocks are used to detect the voltage between power grid end firewire and zero curve, including the second resistance being parallel between firewire and zero curve；Control module, control module is connected to the voltage signal of load blocks and real-time detection second resistance, when great variation occurs for the voltage signal of second resistance, control IGBT circuit breaker, it solves current sensor and needs conversion time, cause circuit breaker not in time the problem of, achieved the effect that quick to judge in single-phase circuit whether short circuit and to carry out open circuit to circuit in time.
Description
Technical field
The present invention relates to breaker technical field, in particular to a kind of single-phase arc extinguishing type short-circuit protector.
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 current sensor Acquisition Circuit for thering is active arc extinguishing type short-circuit protection to use at present, then number
According to digitial controller is supplied to, the method for short circuit is judged whether to realize by operation, but this scheme drawback is current sense
There are conversion time, program operations to need the time for device, from the time for being shorted to the dozens or even hundreds of microsecond of cutting power supply needs.
Summary of the invention
The object of the present invention is to provide a kind of single-phase arc extinguishing type short-circuit protectors, have and respond rapidly, not by current sense
The advantages of device conversion speed, can quickly to single-phase circuit whether short circuit judge and in time to circuit carry out open circuit.
Above-mentioned technical purpose of the invention has the technical scheme that
Single-phase arc extinguishing type short-circuit protector, including the IGBT circuit being connected between power grid end and output loading end, the IGBT
Circuit includes: load blocks, and load blocks are used to detect the voltage between power grid end firewire and zero curve, and load blocks include parallel connection
Second resistance between firewire and zero curve；Control module, control module are connected to load blocks and the second electricity of real-time detection
The voltage signal of resistance controls IGBT circuit breaker when great variation occurs for the voltage signal of second resistance；Control module includes
Sampling unit, processing unit and on-off unit；Sampling unit is used to detect the voltage value at second resistance both ends and is converted into electric current
Signal output；Processing unit is connected to sampling unit and in response to the current signal of sampling unit output, and processing unit will connect
The current signal received is handled, and when current signal is sine wave, exports high level signal, when current signal occurs sharply
When variation, low level signal is exported；The current signal that on-off unit connects processing unit and exports in response to processing unit, when
When on-off unit receives high level signal, load end access is controlled, when on-off unit receives low level signal, control is negative
Carry end open circuit；On-off unit includes the first triode, the second triode, first diode and the second diode, the first triode
Collector and emitter be electrically connected on firewire, the emitter of the second triode is electrically connected to the emitter of the first triode
On, the collector of the second triode is electrically connected on firewire, and first diode is parallel to collector and the transmitting of the first triode
Pole, for the second diodes in parallel in the collector and emitter of the second triode, processing unit is electrically connected to the first triode and
The base stage of two triodes, the first triode when processing unit exports high level to the base stage of the first triode and the second triode
It is connected with the collector and emitter of the second triode, when processing unit is exported to the base stage of the first triode and the second triode
The collector and emitter of the first triode and the second triode ends when low level.
By using above scheme, when IGBT circuit works normally, second resistance both sides voltage stabilization, sampling unit inspection
It surveys the voltage value at second resistance both ends and converts thereof into current signal and export to processing unit, processing unit will be at current signal
High level signal is exported after reason to the base stage of the first triode and the second triode, the first triode and the second triode ON,
Work normally circuit, when short circuit occurs for circuit, change dramatically occurs for the voltage value of second resistance, and processing unit exports low electricity
Ordinary mail number gives the base stage of the first triode and the second triode, ends the first triode and the second triode, makes entire circuit
Open circuit, due to not needing current sensor, so short-circuit protector can quickly react the short circuit of circuit, and in time
Open circuit is carried out to circuit, achievees the effect that protect safe and stable operation of power system.
Preferably, the sampling unit includes the operational amplifier for being electrically connected to second resistance both ends；The processing unit
Photoelectrical coupler is controlled including the digit chip being sequentially connected in series and door, digit chip is electrically connected to the output end of operational amplifier,
The output end of door control photoelectrical coupler is electrically connected to the base stage of the first triode and the second triode.
By using above scheme, the voltage value at second resistance both ends is zoomed into current value and exported to number by operational amplifier
Word chip, control door control photoelectrical coupler output high level signal or low level signal after digit chip processing.
Preferably, being electrically connected with the first two-way TVS pipe at second resistance both ends.
By using above scheme, the first two-way TVS pipe can be when the voltage value on second resistance both sides be lifted rapidly
Breakdown, short-circuit second resistance is waited, plays the role of protecting circuit.
Preferably, being parallel with first capacitor between two input terminals of operational amplifier.
By using above scheme, first capacitor can be filtered the voltage signal for entering operational amplifier, make to transport
The amplification result for calculating amplifier is more accurate.
Preferably, the output end in operational amplifier is electrically connected with the second capacitor, second capacitor other end ground connection.
By using above scheme, the clutter that operational amplifier exports can be led to ground by the second capacitor, make operation amplifier
The waveform of device output is more stable, as a result more accurate.
Preferably, the output end in operational amplifier is electrically connected with the second two-way TVS pipe, the second two-way TVS pipe other end
It is electrically connected with 3.3V power supply.
By using above scheme, since the output end of operational amplifier will connect digit chip, digit chip can not be held
By the electric current for being higher than 3.3V voltage, the second two-way TVS pipe can prevent the electric current higher than 3.3V voltage from entering digit chip, play
Protect the effect of digit chip.
Preferably, the output end in operational amplifier is electrically connected with the two-way TVS pipe of third, the two-way TVS pipe other end of third
Ground connection.
By using above scheme, since the output end of operational amplifier will connect digit chip, digit chip can not be held
By the electric current for being lower than 0V voltage, the two-way TVS pipe of third can prevent the electric current lower than 0V voltage from entering digit chip, play protection
The effect of digit chip.
Preferably, being connected with frequency selection circuit in door driving photoelectric coupler output end, frequency selection circuit includes being series at a drive
9th resistance of the output end of dynamic photoelectrical coupler is parallel to the 9th resistance both ends and the tenth resistance being serially connected and the 4th
Capacitor is parallel with negative 9V power supply between the tenth resistance and the 4th capacitor.
By using above scheme, door drives the driving signal of photoelectrical coupler output to pass through frequency selection circuit, only meets
The driving signal of set waveform can play the role of removing door driving photoelectrical coupler output clutter by frequency selection circuit.
Preferably, the output end of door driving photoelectrical coupler is connected with switching circuit, the switching circuit include: according to
Positive 15V power supply, third transistor, the 4th triode and the negative 9V power supply of secondary setting, the base stage of third transistor are electrically connected to door
The output end of photoelectrical coupler is driven, the collector of third transistor is electrically connected to positive 15V power supply, the emitter of third transistor
It is electrically connected to the collector of the 4th triode, the base stage of the 4th triode is electrically connected to an output end for driving photoelectrical coupler,
The emitter of 4th triode is electrically connected to negative 9V power supply, and the emitter of third transistor is electrically connected to the first triode and second
The base stage of triode.
By using above scheme, when the driving signal of door driving photoelectrical coupler output is high level, the three or three pole
Pipe and the 4th triode ON export high level signal to the base stage of the first triode and the second triode, when door drives photoelectricity
When the driving signal of coupler output is low level, third transistor and the shutdown of the 4th triode, output signal, does not reach control
The effect of IGBT circuit.
Preferably, the door driving photoelectrical coupler is electrically connected with voltage regulator circuit, voltage regulator circuit includes the 6th capacitor, the 7th
Capacitor and the 8th capacitor, the 6th capacitor and the 7th capacitor are series between positive 15V power supply and negative 9V power supply, and the 8th capacitor is parallel to
6th capacitor and the 7th capacitor both ends, the 6th capacitor and the 7th capacitor indirectly.
By using above scheme, door driving photoelectrical coupler needs to remove positive 15V power supply and the progress pressure stabilizing of negative 9V power supply
Clutter makes powered stable, it is ensured that circuit runs well.
In conclusion the invention has the following advantages:
1. second resistance both sides voltage stabilization, sampling unit detects the electricity at second resistance both ends when IGBT circuit works normally
Pressure value simultaneously converts thereof into current signal and exports to processing unit, and processing unit exports high level signal after handling current signal
To the base stage of the first triode and the second triode, the first triode and the second triode ON work normally circuit, work as electricity
When short circuit occurs for road, change dramatically occurs for the voltage value of second resistance, and processing unit exports low level signal to the first triode
With the base stage of the second triode, ends the first triode and the second triode, make entire circuit breaker, due to not needing electric current
Sensor reaches so short-circuit protector can quickly react the short circuit of circuit, and carry out open circuit to circuit in time
Protect the effect of safe and stable operation of power system；
2. the driving signal of driving photoelectrical coupler output passes through frequency selection circuit, only meet the driving signal energy of set waveform
Enough by frequency selection circuit, play the role of removing door driving photoelectrical coupler output clutter；
3. driving photoelectrical coupler needs to carry out pressure stabilizing to positive 15V power supply and negative 9V power supply to remove clutter, make powered stable, really
Circuit is protected to run well.
Detailed description of the invention
Fig. 1 is the integrated circuit schematic diagram of IGBT circuit in embodiment；
Fig. 2 is the circuit diagram of operation amplifier circuit in embodiment；
Fig. 3 is the circuit diagram of digit chip circuit in embodiment；
Fig. 4 is the circuit diagram of door driving photoelectrical coupler in embodiment；
Fig. 5 is the circuit diagram of voltage regulator circuit in embodiment.
In figure, 1, load blocks；2, control module；21, sampling unit；211, operational amplifier；22, processing unit；
221, digit chip；222, door drives photoelectrical coupler；2221, frequency selection circuit；2222, switching circuit；2223, voltage regulator circuit；
23, on-off unit；R1, first resistor；R2, second resistance；R3,3rd resistor；R4, the 4th resistance；R5, the 5th resistance；R6,
Six resistance；R7, the 7th resistance；R8, the 8th resistance；R9, the 9th resistance；R10, the tenth resistance；D1, first diode；D2, second
Diode；D3, the first two-way TVS pipe；D4, the second two-way TVS pipe；The two-way TVS pipe of D5, third；Q1, the first triode；Q2,
Two triodes；Q3, third transistor；Q4, the 4th triode；C1, first capacitor；C2, the second capacitor；C3, third capacitor；C4,
4th capacitor；C5, the 5th capacitor；C6, the 6th capacitor；C7, the 7th capacitor；C8, the 8th capacitor；L, firewire；N, zero curve.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.The wherein identical appended drawing reference of identical components
It indicates.It should be noted that word "front", "rear" used in the following description, "left", "right", "up" and "down" refer to it is attached
Direction in figure, word " bottom surface " and " top surface ", "inner" and "outside" are referred respectively to towards or away from geometric center of specific component
Direction.
Embodiment: a kind of single-phase arc extinguishing type short-circuit protector, as shown in Figure 1, including being connected to power grid end and output loading
IGBT circuit between end, TGBT circuit include load blocks 1 and control module 2.Load blocks 1 are connected to power grid end, load
Module 1 is used to voltage value and output between real-time detection power grid end firewire L and zero curve N；Control module 2 is connected to load mould
Between block 1 and power grid end, and control module 2 detects the voltage value that load blocks 1 export, when short circuit occurs for circuit, control
Module 2 can fast control circuit open circuit, play the role of protect power equipment safety.
As shown in Figure 1, load blocks 1 include first resistor R1, the second resistance R2 being parallel between zero curve N and firewire L
It is serially connected with 3rd resistor R3, first resistor R1, second resistance R2 and 3rd resistor R3, is parallel at the both ends second resistance R2
First two-way TVS pipe D3.Whether control module 2 is short-circuit come decision circuitry by the voltage value for detecting the both ends second resistance R2, the
Voltage value of the one two-way TVS pipe D3 at the both ends second resistance R2 can be breakdown when raising rapidly, short-circuit second resistance R2,
Play the effect of protection circuit.
As depicted in figs. 1 and 2, control module 2 includes sequentially connected sampling unit 21, processing unit 22 and on-off unit
23, sampling unit 21 includes operational amplifier 211, processing unit 22 include the digit chip 221 (referring to Fig. 3) that is sequentially connected in series and
Door driving photoelectrical coupler 222 (referring to fig. 4), on-off unit 23 include the first triode Q1 and the second triode Q2, and the one or three
Pole pipe Q1 and the second triode Q2 are series on firewire L, and the voltage value at the both ends second resistance R2 is converted to by operational amplifier 211
Current signal simultaneously amplifies, and passes to digit chip 221, and digit chip 221 passes to a driving photoelectrical coupler after treatment
222, the current signal that door drives photoelectrical coupler 222 to be transmitted according to digit chip 221 is to the first triode Q1 and the two or three pole
The base stage output high level signal or low level signal of pipe Q2, thus the on-off of control circuit.
As shown in Fig. 2, first capacitor C1 is parallel between the positive and negative input terminal of operational amplifier 211, in operational amplifier
211 negative input is electrically connected with the 4th resistance R4, is electrically connected with the 5th resistance in the positive input of operational amplifier 211
R5 is parallel with the 7th resistance R7 between the positive input of operational amplifier 211 and the 5th resistance R5, operational amplifier 211
The 6th resistance R6 is parallel between negative input and output end, the output end of operational amplifier 211 is electrically connected with the 8th resistance
R8, the 8th resistance R8 other end are electrically connected with the second capacitor C2, second capacitor C2 other end ground connection.Operational amplifier 211 just,
Negative input end is parallel to the both ends second resistance R2, and operational amplifier 211 receives the voltage signal at the both ends second resistance R2, by the
One capacitor C1 filters out clutter, and then received voltage signal is converted into current signal and exports and put by operational amplifier 211
Greatly, the second capacitor C2 filters out the clutter in current signal that operational amplifier 211 exports with passing to, and guarantees operation amplifier
The current signal stable that device 211 exports.
As shown in Figures 2 and 3, the 8th resistance R8 is electrically connected with the second two-way TVS pipe D4, and the second two-way TVS pipe D4 is another
End is electrically connected with 3.3V analog voltage, and the 8th resistance R8 is also electrically connected with the two-way TVS pipe D5 of third, and the two-way TVS pipe D5 of third is another
One end ground connection, the output end of operational amplifier 211 will connect digit chip 221, and digit chip 221 cannot receive voltage and be higher than
3.3V or electric current lower than 0V, the second two-way TVS pipe D4 and the two-way TVS pipe D5 of third can be exported in operational amplifier 211
Driving signal voltage be higher than 3.3V or be lower than 0V when it is breakdown, protect digit chip 221.
As shown in Figure 3 and Figure 4, the model STM32F103VCT6, the 8th resistance R8 of digit chip 221 are electrically connected to number
No. 16 pins of word chip 221, door drive the model HCPL-316J of photoelectrical coupler 222, No. 81 pipes of digit chip 221
Foot is electrically connected to No. 1 pin of driving photoelectrical coupler 222.The driving signal that operational amplifier 211 exports passes through digital core
No. 16 pins of piece 221, which enter in digit chip 221, to be handled, digit chip 221 will treated driving signal from No. 81
Pin exports and enters in a driving photoelectrical coupler 222 from No. 1 pin of door driving photoelectrical coupler 222 and handled.
As shown in figure 4, No. 13 pins and No. 12 pins of door driving photoelectrical coupler 222 are electrically connected with positive 15V power supply, door
No. 9 pins and No. 10 pins for driving photoelectrical coupler 222 are electrically connected with negative 9V power supply, and positive 15V power supply and negative 9V power supply are to door
Photoelectrical coupler 222 is driven to power.No. 11 pins of door driving photoelectrical coupler 222 are connected with frequency selection circuit 2221 in turn and open
Powered-down road 2222, door drive photoelectrical coupler 222 to receive driving signal by No. 1 pin, are exported after treatment by No. 11 pins.
As shown in figure 4, frequency selection circuit 2221 includes the 9th resistance R9, the tenth resistance R10 and the 4th capacitor C4, the 9th resistance
R9 is electrically connected to No. 11 pins of driving photoelectrical coupler 222, and the tenth resistance R10 and the 4th capacitor C4 are parallel to the 9th resistance
The both ends R9 are parallel with negative 9V power supply between the tenth resistance R10 and the 4th capacitor C4.Door can be driven light by frequency selection circuit 2221
The clutter in driving signal that electric coupler 222 exports removes, and the driving signal of specific frequency is only stayed to pass through.
As shown in Figure 1 and Figure 4, switching circuit 2222 includes the third transistor Q3 and the 4th triode Q4 being serially connected,
9th resistance R9 is electrically connected to the base stage of third transistor Q3 and the 4th triode Q4, the collector electrical connection of third transistor Q3
There is positive 15V power supply, the emitter of third transistor Q3 is electrically connected to the collector of the 4th triode Q4, the hair of the 4th triode Q4
Emitter-base bandgap grading is electrically connected with negative 9V power supply, and the emitter of third transistor Q3 is electrically connected to the first triode Q1's and the second triode Q2
Base stage.The driving signal of 222 output of door driving photoelectrical coupler is direct current, when door driving photoelectrical coupler 222 exports high electricity
When ordinary mail, third transistor Q3 and the 4th triode Q4 conducting export high level signal to the first triode Q1 and the two or three
The base stage of pole pipe Q2, to control the first triode Q1 and the second triode Q2 conducting.When door driving photoelectrical coupler 222 export it is low
When level signal, third transistor Q3 and the 4th triode Q4 shutdown, output signal, does not make the first triode Q1 and the two or three pole
Pipe Q2 shutdown.The emitter of first triode Q1 is electrically connected to the emitter of the second triode Q2, in the hair of the first triode Q1
Emitter-base bandgap grading and collector both ends are parallel with first diode D1, and first diode D1 is from the emitter of the first triode Q1 to collector
Conducting, the emitter and collector both ends of the second triode Q2, which are parallel with the second diode D2, the second diode D2, the two or three
The emitter of pole pipe Q2 is connected to collector, and the forward current of power grid is by the first triode Q1 and the second diode D2 by power grid
End flows to output loading end, and the negative current of power grid is flowed to by the second triode Q2 and first diode D1 by output loading end
Power grid end, when the first triode Q1 and the second triode Q2 ends, entire circuit breaker realizes protection.
As shown in Figure 4 and Figure 5, it is connected between the positive 15V power supply and negative 9V power supply of door driving photoelectrical coupler 222 steady
Volt circuit 2223, voltage regulator circuit 2223 include the 6th capacitor C6, the 7th capacitor C7 and the 8th capacitor C8, the 6th capacitor C6 and the 7th
Capacitor C7 is series between positive 15V power supply and negative 9V power supply, and the 8th capacitor C8 is parallel to the 6th capacitor C6 and the 7th capacitor C7 two
End, in being arranged indirectly for the 6th capacitor C6 and the 7th capacitor C7.Voltage regulator circuit 2223 can be to positive 15V power supply and negative 9V power supply
It carries out pressure stabilizing and removes clutter, guarantee that positive 15V power supply and negative 9V power supply output waveform are stablized.
Usage mode: when the circuit is operating normally, forward current is by the first triode Q1 and the second diode D2 by electricity
Net end flows to output loading end, and negative current flows to power grid by output loading section by the second triode Q2 and first diode D1
End, the voltage at the both ends second resistance R2 is the sinusoidal variations according to 50HZ, voltage stabilization, the electricity at the both ends second resistance R2 at this time
Signal is pressed to enter in operational amplifier 211 after first capacitor C1 filtering, voltage signal is converted into driving by operational amplifier 211
It moves signal and amplifies, the driving signal that operational amplifier 211 exports is filtered by the second capacitor C2 by the 16 of digit chip 221
Number pin, which enters in digit chip 221, to be handled, and digit chip 221 is passed through by the driving signal of No. 81 pins output high level
No. 1 pin of door driving photoelectrical coupler 222, which enters in a driving photoelectrical coupler 222, to be handled, and door drives photoelectric coupling
Clutter is filtered by frequency selection circuit 2221 by the driving signal of No. 11 pin output high level, is then input to third by device 222
The base stage of triode Q3 and the 4th triode Q4 control first by control third transistor Q3 and the 4th triode Q4 conducting
Triode Q1 and the second triode Q2 conducting, makes normal operation circuit.
When short circuit occurs in circuit, great variation occurs for the voltage value at the both ends second resistance R2, and digit chip 221 exports low
The driving signal of level simultaneously passes to a driving photoelectrical coupler 222, and door driving photoelectrical coupler 222 exports low level driving
Signal is to third transistor Q3 and the 4th triode Q4, the base stage wave-off of the first triode Q1 and the second triode Q2,
End the first triode Q1 and the second triode Q2, make circuit breaker, plays the effect of protection safe and stable operation of power system
Fruit.Due to only driving photoelectrical coupler 222 using digit chip 221 and door by the voltage value at the detection both ends second resistance R2
Processing can control circuit open circuit, judge that speed is fast, it is at low cost, can in time to circuit carry out open circuit protection.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the scope of the claims of invention.
Claims (10)
1. a kind of single-phase arc extinguishing type short-circuit protector, which is characterized in that including being connected between power grid end and output loading end
IGBT circuit, the IGBT circuit include:
Load blocks (1), load blocks (1) are used to detect the voltage between power grid end firewire (L) and zero curve (N), load blocks
It (1) include the second resistance (R2) being parallel between firewire (L) and zero curve (N)；
Control module (2), control module (2) are connected to the voltage letter of load blocks (1) and real-time detection second resistance (R2)
Number, when great variation occurs for the voltage signal of second resistance (R2), control IGBT circuit breaker；
Control module (2) includes sampling unit (21), processing unit (22) and on-off unit (23)；Sampling unit (21) is for examining
It surveys the voltage value at the both ends second resistance (R2) and is converted into current signal output；Processing unit (22) is connected to sampling unit (21)
And in response to the current signal of sampling unit (21) output, processing unit (22) handles the current signal received,
When current signal is sine wave, high level signal is exported, when change dramatically occurs for current signal, exports low level signal；
On-off unit (23) connects processing unit (22) and in response to the current signal of processing unit (22) output, when on-off unit
(23) when receiving high level signal, load end access is controlled, when on-off unit (23) receives low level signal, control is negative
Carry end open circuit；On-off unit (23) includes the first triode (Q1), the second triode (Q2), first diode (D1) and the two or two
Pole pipe (D2), the collector and emitter of the first triode (Q1) are electrically connected on firewire (L), the transmitting of the second triode (Q2)
Pole is electrically connected on the emitter of the first triode (Q1), and the collector of the second triode (Q2) is electrically connected on firewire (L), the
One diode (D1) is parallel to the collector and emitter of the first triode (Q1), and the second diode (D2) is parallel to the two or three pole
The collector and emitter of (Q2) is managed, processing unit (22) is electrically connected to the base of the first triode (Q1) and the second triode (Q2)
Pole, the first triode when processing unit (22) exports high level to the base stage of the first triode (Q1) and the second triode (Q2)
(Q1) it is connected with the collector and emitter of the second triode (Q2), when processing unit (22) is to the first triode (Q1) and second
The collector and emitter of the first triode (Q1) and the second triode (Q2) is cut when the base stage of triode (Q2) exports low level
Only.
2. a kind of single-phase arc extinguishing type short-circuit protector according to claim 1, which is characterized in that the sampling unit (21)
Operational amplifier (211) including being electrically connected to the both ends second resistance (R2)；
The processing unit (22) includes the digit chip (221) being sequentially connected in series and door control photoelectrical coupler (222), digital core
Piece (221) is electrically connected to the output end of operational amplifier (211), and the output end of door control photoelectrical coupler (222) is electrically connected to
The base stage of first triode (Q1) and the second triode (Q2).
3. a kind of single-phase arc extinguishing type short-circuit protector according to claim 1, it is characterised in that: in second resistance (R2) two
End is electrically connected with the first two-way TVS pipe (D3).
4. a kind of single-phase arc extinguishing type short-circuit protector according to claim 2, it is characterised in that: in operational amplifier
(211) first capacitor (C1) is parallel between two input terminals.
5. a kind of single-phase arc extinguishing type short-circuit protector according to claim 2, it is characterised in that: in operational amplifier
(211) output end is electrically connected with the second capacitor (C2), the second capacitor (C2) other end ground connection.
6. a kind of single-phase arc extinguishing type short-circuit protector according to claim 2, it is characterised in that: in operational amplifier
(211) output end is electrically connected with the second two-way TVS pipe (D4), and second two-way TVS pipe (D4) other end is electrically connected with 3.3V electricity
Source.
7. a kind of single-phase arc extinguishing type short-circuit protector according to claim 2, it is characterised in that: in operational amplifier
(211) output end is electrically connected with the two-way TVS pipe of third (D5), third two-way TVS pipe (D5) other end ground connection.
8. a kind of single-phase arc extinguishing type short-circuit protector according to claim 2, which is characterized in that drive photoelectric coupling in door
Device (222) output end is connected with frequency selection circuit (2221), and frequency selection circuit (2221) includes being series at a driving photoelectrical coupler
(222) the 9th resistance (R9) of output end, the tenth resistance (R10) for being parallel to the 9th resistance both ends (R9) and being serially connected
With the 4th capacitor (C4), negative 9V power supply is parallel between the tenth resistance (R10) and the 4th capacitor (C4).
9. a kind of single-phase arc extinguishing type short-circuit protector according to claim 2, which is characterized in that the door drives photoelectricity coupling
The output end of clutch (222) is connected with switching circuit (2222), and the switching circuit (2222) includes:
Positive 15V power supply, third transistor (Q3), the 4th triode (Q4) and the negative 9V power supply set gradually, third transistor
(Q3) base stage is electrically connected to an output end for driving photoelectrical coupler (222), the collector electrical connection of third transistor (Q3)
In positive 15V power supply, the emitter of third transistor (Q3) is electrically connected to the collector of the 4th triode (Q4), the 4th triode
(Q4) base stage is electrically connected to an output end for driving photoelectrical coupler (222), the emitter electrical connection of the 4th triode (Q4)
In negative 9V power supply, the emitter of third transistor (Q3) is electrically connected to the base of the first triode (Q1) and the second triode (Q2)
Pole.
10. a kind of single-phase arc extinguishing type short-circuit protector according to claim 9, it is characterised in that: the door drives photoelectricity
Coupler (222) is electrically connected with voltage regulator circuit (2223), and voltage regulator circuit (2223) includes the 6th capacitor (C6), the 7th capacitor (C7)
With the 8th capacitor (C8), the 6th capacitor (C6) and the 7th capacitor (C7) are series between positive 15V power supply and negative 9V power supply, the 8th electricity
Hold (C8) and be parallel to the 6th capacitor (C6) and the 7th both ends capacitor (C7), the 6th capacitor (C6) and the 7th capacitor (C7) are indirectly
Ground.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810416832.XA CN110445091A (en) | 2018-05-03 | 2018-05-03 | A kind of single-phase arc extinguishing type short-circuit protector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810416832.XA CN110445091A (en) | 2018-05-03 | 2018-05-03 | A kind of single-phase arc extinguishing type short-circuit protector |
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| CN110445091A true CN110445091A (en) | 2019-11-12 |
Family
ID=68428008
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810416832.XA Pending CN110445091A (en) | 2018-05-03 | 2018-05-03 | A kind of single-phase arc extinguishing type short-circuit protector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114336565A (en) * | 2022-03-10 | 2022-04-12 | 成都凯天电子股份有限公司 | Lightning protection device based on high-temperature silicon piezoresistive sensor and lightning protection method thereof |
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