CN106024520B - Electronic arc-suppressor - Google Patents
Electronic arc-suppressor Download PDFInfo
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- CN106024520B CN106024520B CN201610410574.5A CN201610410574A CN106024520B CN 106024520 B CN106024520 B CN 106024520B CN 201610410574 A CN201610410574 A CN 201610410574A CN 106024520 B CN106024520 B CN 106024520B
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- thyristor
- circuit
- voltage detecting
- detecting circuit
- control
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/541—Contacts shunted by semiconductor devices
- H01H9/542—Contacts shunted by static switch means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/541—Contacts shunted by semiconductor devices
- H01H9/542—Contacts shunted by static switch means
- H01H2009/545—Contacts shunted by static switch means comprising a parallel semiconductor switch being fired optically, e.g. using a photocoupler
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Keying Circuit Devices (AREA)
Abstract
Electronic arc-suppressor of the present invention belongs to electricity field, particularly a kind of to be suitable for electronic arc-suppressor of the mechanical switch as arc extinguishing purposes, including the thyristor in parallel with the contact both ends of mechanical switch, it is characterized in that：The major loop connection voltage detecting circuit of thyristor, the output terminal of voltage detecting circuit are connected with control circuit, and voltage detecting circuit is used to detect contact closure；Control circuit and the control terminal of thyristor connect, control circuit provides turn on thyristors control signal when voltage detecting circuit detects contact closure, for contact closure spring arc extinguishing, electronic arc-suppressor of the present invention has the advantages that ON time is short, overload capacity is strong, easy to use.
Description
Technical field
Electronic arc-suppressor of the present invention belongs to electricity field, and particularly one kind is suitably applied contactor, relay, open circuit
Electronic arc-suppressor in device and other mechanical switch as arc extinguishing purposes.
Background technology
At present in electric control system, widely use the mechanical switch such as contactor, relay, breaker and load is carried out
Disjunction control is connected, but since the arc-chute of the prior art is, it is necessary to move breaking arc to certain length, can just work, deposit
Poor in arc quenching effect, electric arc is big when disjunction loads, and causes the easy scaling loss of mechanical switch, the shortcomings that electric life is short.
For this purpose, there is the arc-control device for mechanical switch arc extinguishing, it is entitled such as Patent No. CN01201907.0
The patent of " electronic arc-control device "；Patent No. CN200910306608.6, the entitled " hybrid AC contactor based on optocoupler
Passive switch driving controller ", two patents are revealed, in a manner that thyristor is in parallel with the contact both ends of contactor,
The working power of the control circuit of the electronic arc-suppressor and the control coil of contactor connect, in the contact closure of contactor
Before, control circuit provides the signal of a control turn on thyristors, and spring arc extinguishing is closed for contactor；When the control of contactor
Coil losing electricity, contact is in disjunction, turn on thyristors, passes through the filter capacitor discharge lag of control circuit, time delayed turn-off crystalline substance lock
The drive signal of pipe conducting, thyristor cut-off, completes no electric arc breaking course.It has the following disadvantages：Reach contactor to close
It must make turn on thyristors in advance in contact closure when closing spring arc extinguishing, thyristor is caused to need ON time longer, and is held
The heavy current impact that moment is easily connected by load damages.
The content of the invention
It is an object of the invention to avoid the shortcoming of existing electronic arc-suppressor, a kind of thyristor is provided and is opened in machinery
Close ON time short electronic arc-suppressor when closing.
It achieves the object of the present invention by the following technical programs to reach：
A kind of electronic arc-suppressor, including the thyristor in parallel with the contact both ends of mechanical switch, the master of thyristor returns
Road connects voltage detecting circuit, and the output terminal of voltage detecting circuit is connected with control circuit, and voltage detecting circuit is tactile for detecting
Point is closed；Control circuit and the control terminal of thyristor connect, and control circuit is carried when voltage detecting circuit detects contact closure
For turn on thyristors control signal, for contact closure spring arc extinguishing.
A kind of electronic arc-suppressor, voltage detecting circuit are full wave voltage detection circuit.
A kind of electronic arc-suppressor, voltage detecting circuit include first voltage detection circuit, second voltage detection circuit；It is brilliant
Brake tube includes the first thyristor, the second thyristor；Contact includes the first contact, the second contact；First voltage detection circuit and the
The major loop of one thyristor is in parallel, and the major loop both ends of the first thyristor are in parallel with the first contact both ends；Second voltage is examined
Slowdown monitoring circuit is in parallel with the major loop of the second thyristor, and the major loop both ends of the second thyristor are in parallel with the second contact both ends.
A kind of electronic arc-suppressor, voltage detecting circuit include tertiary voltage detection circuit；Thyristor includes the 3rd brilliant lock
Pipe；Contact includes the 3rd contact；Tertiary voltage detection circuit is in parallel with the major loop of the 3rd thyristor, and the master of the 3rd thyristor returns
Road both ends are in parallel with the 3rd contact both ends.
A kind of electronic arc-suppressor, the major loop connection current sensor of thyristor, the output terminal of current sensor and control
Circuit processed connection, current sensor are disconnected, control circuit is in electric current by detecting the conducting electric current of thyristor for detecting contact
Sensor, which detects, closes turn on thyristors control signal when contact disconnects.
A kind of electronic arc-suppressor, current sensor are current transformer.
A kind of electronic arc-suppressor, control circuit are connected by at least driving circuit of an electronic switch and thyristor, are driven
The drive signal of dynamic turn on thyristors is transferred to crystalline substance by the major loop of thyristor by the series circuit being made of capacitance and resistance
The control pole of brake tube, electronic switch are used to control drive signal.
A kind of electronic arc-suppressor, electronic switch are photoelectrical coupler.
The series circuit of a kind of electronic arc-suppressor, capacitance and resistance composition is connected in parallel on the major loop of thyristor by device
Input and output both ends.
A kind of electronic arc-suppressor, voltage detecting circuit include a resistance, a photoelectrical coupler, resistance and photoelectrical coupler
Control terminal connection.
A kind of electronic arc-suppressor, control circuit are built-in with programming device.
A kind of electronic arc-suppressor, programming device are microcontroller.
A kind of electronic arc-suppressor, the input power of control circuit are provided by the input terminal of the major loop of thyristor.
A kind of electronic arc-suppressor, control circuit are useful for the input port of input mechanical switch synchronizing signal.
The input and output both ends of a kind of electronic arc-suppressor, the input terminal of voltage detecting circuit and the major loop of thyristor connect
It connects.
A kind of electronic arc-suppressor, the input terminal of voltage detecting circuit and the major loop load end of thyristor connect.
A kind of electronic arc-suppressor, voltage detecting circuit is for detecting contact disconnection, and control circuit is in voltage detecting circuit
When detecting that contact disconnects, thyristor pulse signal is provided.
A kind of electronic arc-suppressor, voltage detecting circuit include at least a voltage transformer.
A kind of electronic arc-suppressor, control circuit are built-in with microcontroller, and the major loop of thyristor connects current sensor,
Current sensor detects the conducting electric current of thyristor, is disconnected for detecting contact, voltage detecting circuit and current sensor it is defeated
Go out signal and be transferred to microcontroller, microcontroller at least one exports the control terminal that signal is transferred to thyristor, and microcontroller exists
Voltage detecting circuit provides turn on thyristors control signal when detecting contact closure, and microcontroller is detected in current sensor
Turn on thyristors control signal is closed when contact disconnects.
A kind of electronic arc-suppressor, voltage detecting circuit is for detecting mechanical switch disconnection, and control circuit is in voltage detecting
When circuit detects that mechanical switch disconnects, turn on thyristors control signal is closed.
Its operation principle：The electronic arc-suppressor of the present invention, during mechanical switch Operating In Persistent Current Mode in parallel therewith, electricity
Pressure detection circuit is used to detect the contact closure of mechanical switch, when control circuit is closed in the contact of mechanical switch one, control
Turn on thyristors processed realizes the arc extinguishing that bounces the closure of mechanical switch；Mechanical switch is disconnected in the course of work, and mechanical switch touches
Point first disconnects, control circuit control thyristor cut-off.
Present invention design is reasonable, based on the contact of mechanical switch during connection, as long as can just be produced when bouncing
Raw larger electric arc, is used to detect the contact closure of mechanical switch by voltage detecting circuit, in mechanical switch closing course, machine
The contact one of tool switch is closed, and signal is passed to control circuit by voltage detecting circuit again so that control circuit control is brilliant
Brake tube turns on, and realizes the purpose that spring arc extinguishing is closed to mechanical switch, is first closed by the contact of mechanical switch, control circuit is controlled again
Product brake tube turns on, and greatly reduces the working time of thyristor and reduces and connects load high current caused by thyristor
Impact, turn on thyristors time are extremely short, you can play the role of the closure spring arc extinguishing to mechanical switch, when mechanical switch disconnects
In the course of work, the contact of mechanical switch first disconnects, control circuit control thyristor cut-off.
Description of the drawings
Fig. 1 is one of the embodiment of the present invention circuit diagram.
Fig. 2 is two circuit diagrams of the embodiment of the present invention.
Fig. 3 is the three-circuit schematic diagram of the embodiment of the present invention.
Fig. 4 is four circuit diagrams of the embodiment of the present invention.
Fig. 5 is five circuit diagrams of the embodiment of the present invention.
Specific embodiment
As shown in Figure 1, one of the embodiment of the present invention, fills for a kind of electronic arc eliminating for monopole mechanical switch arc extinguishing
Put, including the thyristor TR1 in parallel with the contact both ends of mechanical switch SW1, control circuit (A), voltage detecting circuit (B1) and
Current Transmit.Voltage detecting circuit (B1) is in parallel with the major loop of thyristor TR1, voltage detecting circuit (B1) output terminal with
Control circuit (A) connects, and Current Transmit is connected with the major loop of thyristor TR1, Current Transmit detection thyristor TR1
Conducting electric current, disconnected for detecting the contact of mechanical switch SW1, the major loop both ends of thyristor TR1 respectively with mechanical switch
The contact both ends connection of SW1, J1 and J2 are respectively the input and output endpoint of major loop, and mechanical switch SW1 is to be connected with the present apparatus
Required arc extinguishing mechanical switch, J3 circuit (A) power input ports in order to control.
Voltage detecting circuit (B1)：Including current-limiting resistance R1, photoelectrical coupler OPT1；The input terminal of photoelectrical coupler OPT1
It is in parallel with the major loop both ends of thyristor TR1 by current-limiting resistance R1, output terminal and the control circuit (A) of photoelectrical coupler OPT1
Connection.
The course of work：By the present apparatus for exemplified by mechanical switch SW1 arc extinguishings, control circuit (A) must be electric, in mechanical switch
In the case that the contact of SW1 disconnects, voltage detecting circuit (B1) input both ends input has alternating voltage, output terminal output height
Level pulsewidth is relatively stable, and the pulsewidth for the signal that control circuit (A) is provided according to voltage detecting circuit (B1) identifies that machinery is opened
The closure of SW1 is closed, when closure situation occurs in the contact of mechanical switch SW1, control circuit (A) control thyristor TR1 conductings are realized
It is brilliant during the arc extinguishing that bounces the contact closure of mechanical switch SW1 to the purpose of the contact closure spring arc extinguishing of mechanical switch
Brake tube TR1 ON times can be short up in 1 millisecond；In the course of work that mechanical switch SW1 is disconnected, have in Current Transmit output
During thyristor TR1 Continuity signals, that is, detect that the contact of mechanical switch SW1 disconnects, control circuit (A) control thyristor TR1 is cut
Only, the purpose to mechanical switch disconnection arc extinguishing is realized, thyristor TR1 can be short up to half of cycle in disconnection arc extinguishing ON time.
In the present embodiment, voltage detecting (B1) circuit will use full wave voltage detection circuit, and photoelectrical coupler OPT1 is adopted
With double light emitting diode photoelectrical couplers, two photoelectrical coupler input terminal reverse parallel connections can also be used to use.
As shown in Fig. 2, the two of the embodiment of the present invention, it is filled for a kind of electronic arc eliminating for monopole mechanical switch arc extinguishing
Put, voltage detecting circuit (B1) it is in parallel with the major loop of thyristor TR1 (i.e. with the input/output terminal of the major loop of thyristor TR1
Connection), Current Transmit is connected with the major loop of thyristor TR1, the conducting electric current of detection thyristor TR1, current transformer
The output terminal of CT is connected with control circuit (A), is disconnected for detecting the contact of mechanical switch SW1, and mechanical switch SW1 is and this dress
Put the mechanical switch of the required arc extinguishing of connection, J1, J2 are the input and output endpoint of major loop, and control circuit (A) is by the way that (Fig. 2 is
It is built-in, or external) driving of electronic switch OPT2 (for a photoelectrical coupler with thyristor output) and thyristor TR1
Circuit connects, and the drive signals of thyristor TR1 conductings is by the major loop of thyristor TR1 by being made of capacitance C1 and resistance R2
Series circuit passes to the control pole of thyristor TR1, and electronic switch OPT2 is connected in the driving circuit of thyristor TR1, electronics
The voltage input end of switch OPT2 is connected with voltage limiting device RV1 pressure limitings, for protecting electronic switch OPT2, voltage detecting circuit
(B1) output terminal is connected with control circuit (A), and J1 and J2 are respectively the input and output endpoint of major loop, J3 circuit (A) in order to control
Power input port.
Voltage detecting circuit (B1)：Including current-limiting resistance R1, photoelectrical coupler OPT1, the input terminal of photoelectrical coupler OPT1
Pass through current-limiting resistance R1 (the i.e. input/output terminal companies of the major loop of thyristor TR1 in parallel with the major loop both ends of thyristor TR1
It connects).
Control circuit (A)：J3 ports are used for input service power supply, and input power is whole through transformer T1, rectification circuit BR1
Stream, capacitance C2 and C3 filtering, IC1 voltage stabilizings, capacitance C4 and C5 are filtered to microcontroller and its interlock circuit power supply, microcontroller
The P0.3 mouths of device MCU are connected with light-emitting diode display part, for status display, P0.1 mouths and the electronic switch OPT2 of microcontroller
Control terminal connection, the output signal of Current Transmit is transferred to the P0.0 mouths of microcontroller through BR2 rectifications, and voltage is examined
The output signal of slowdown monitoring circuit (B1) is connected to the P0.2 mouths of microcontroller, and control circuit (A) passes through electronic switch OPT2 and crystalline substance
The driving circuit connection of brake tube TR1, J4 ports are used to input the input port of mechanical switch SW1 synchronizing signals, electronics of the present invention
Arc-control device switches in dual power supply or motor positive and inverse control is in application, prevent major loop from by other switch bypass, causing control
Circuit (A) is judged by accident.
The course of work：By the present apparatus for exemplified by mechanical switch SW1 arc extinguishings, control circuit (A) must be electric, in mechanical switch
In the case that the contact of SW1 disconnects, voltage detecting circuit (B1) input both ends input has alternating voltage, voltage detecting circuit (B1)
Photoelectrical coupler OPT1 output signals be supplied to the P0.2 mouths of microcontroller, microcontroller passes through to photoelectrical coupler
The pulsewidth of OPT1 outputs is measured to be preserved with data, during pulsewidth when retaining its pulse width time and high level in low level
Between, when the contact of mechanical switch SW1 is closed, low level pulse width time can shorten can be elongated with the pulsewidth of high level, control
The microcontroller of circuit (A) processed provides electronic switch OPT2 control signals, for overcoming crystalline substance before the contact closure of mechanical switch SW1
Brake tube TR1 shorting advances, electronic switch OPT2 output conducting, the contact closure of mechanical switch SW1 moment or bounce,
Very high voltage increase rate will can be generated at thyristor TR1 both ends, capacitance C1 can pass through higher driving current, thyristor
TR1 triggering and conductings realize the purpose of the contact closure spring arc extinguishing of mechanical switch SW1；Mechanical switch SW1 disconnection process, in machine
The moment that tool switch SW1 is disconnected, thyristor TR1 both ends can generate higher voltage increase rate, and capacitance C1 can be by higher
Driving current, thyristor TR1 triggering and conductings, electric current are bypassed by thyristor TR1, realize what mechanical switch SW1 was disconnected without electric arc
Purpose, the P0.0 mouths of microcontroller have the current signal input that Current Transmit transfers, that is, detect mechanical switch SW1
It disconnects, closes electronic switch OPT2 control signals；Mechanical switch SW1 disconnection process, mechanical switch SW1 disconnect moment,
Both ends are just the zero point of voltage, and triggering and conducting, electric current do not have to bypass by thyristor TR1 thyristor TR1, and voltage is examined at this time
Slowdown monitoring circuit (B1) can be used for detecting mechanical switch SW1 disconnections, the electricity that microcontroller is inputted according to voltage detecting circuit (B1)
Press signal, close the control signal of electronic switch OPT2, thyristor TR1 not triggering and conducting can also realize mechanical switch SW1 without
The purpose that electric arc disconnects.
In the present embodiment, voltage detecting circuit (B1) will use full wave voltage detection circuit, and photoelectrical coupler OPT1 is adopted
With double light emitting diode photoelectrical couplers, two photoelectrical coupler input terminal reverse parallel connections can also be used to use, thyristor TR1
Major loop connection Current Transmit, the conducting electric current of Current Transmit detection thyristor TR1 breaks for detecting contact
It opens, the output signal of voltage detecting circuit (B1) and Current Transmit is transferred to microcontroller, and microcontroller is at least
There is the control terminal that an output signal is transferred to thyristor TR1, microcontroller detects that machinery is opened in voltage detecting circuit (B1)
Thyristor TR1 conductivity control signals are provided when closing the contact closure of SW1, microcontroller detects machine in Current Transmit
Tool switch SW1 contact disconnect when close thyristor TR1 conductivity control signals, this microcontroller can also with it is other can
Programming device substitutes, such as programmable array, operation principle are identical.
It has the following advantages in the present embodiment：
1. the series circuit of capacitance C1, resistance R2 composition plays a part of to transfer drive signal to thyristor TR1 in arc extinguishing,
Under mechanical switch SW1 normally opens, it can also rise and absorb transient overvoltage (note：The series circuit is to pass through device (voltage limiter
Part RV1) in parallel with the input/output terminal of the major loop of thyristor TR1), for protecting thyristor TR1, without separately adding resistance-capacitance absorption
Circuit simplifies circuit；The physical features that cannot be mutated using capacitance both end voltage, in the wink that mechanical switch is closed or disconnects
Between, generate very high voltage increase rate, the capacitance very little selected here, can several microfarads of zero point be to 0. more than zero microfarad
Can, can also turn on thyristors be driven by big electric current, with component is less likely to be damaged, reliability is high, at low cost, circuit
The advantages of simple；Due to smaller by the power current of capacitance under the conditions of power frequency, using a voltage limiting device or using normally closed
Electronic switch so significantly reduces the resistance to pressure request to electronic switch, reduces electricity to being bypassed by the power current of capacitance
The cost of sub switch and the reliability for improving electronic switch；
2. control circuit (A) is built-in with microcontroller, circuit can be further simplified.
3. the major loop connection Current Transmit of thyristor TR1, the electric conduction of Current Transmit detection thyristor TR1
Stream disconnects for detecting contact, can greatly reduce the ON time of the disjunction arc extinguishing of thyristor TR1.
4. voltage detecting circuit (B1) for detect mechanical switch SW1 disconnection, mechanical switch SW1 disconnect moment,
Both ends are just the zero point of voltage, and electric current does not have to bypass by thyristor TR1, and microcontroller is according to voltage detecting circuit
(B1) voltage signal of input closes the control signal of electronic switch OPT2, and triggering and conducting can also not realize machine to thyristor TR1
The purpose that tool switch SW1 is disconnected without electric arc.
As shown in figure 3, the three of the embodiment of the present invention, it goes out for a kind of electronics that formula mechanical switch arc extinguishing is controlled for three-phase two
Arc device (note：One phase inlet wire of its threephase load is directly connected to another phase power supply), including control circuit (A), Current Mutual Inductance
Device CT, the first thyristor TR1, the second thyristor TR2, first voltage detection circuit (B1), second voltage detection circuit (B2).The
One voltage detecting circuit (B1) is in parallel with the major loop of the first thyristor TR1, second voltage detection circuit (B2) and the second brilliant lock
The major loop of pipe TR2 is in parallel, first voltage detection circuit (B1), the output terminal and control circuit of second voltage detection circuit (B2)
(A) connect, Current Transmit is connected with the major loop of the second thyristor TR2, for detecting the electric conduction of the second thyristor TR2
Stream, the first thyristor TR1, the second thyristor TR2 major loop both ends respectively with the first contact SW1-1 of mechanical switch SW1, the
Two contacts SW1-2 both ends connect, and J1 and J3, J2 and J4 are respectively the input and output endpoint of two-phase major loop, and mechanical switch SW1 is
The mechanical switch for the required arc extinguishing being connected with the present apparatus, control circuit (A) power input and two power semiconductor TR1, TR2's
The input terminal connection of major loop.
First voltage detection circuit (B1)：Including current-limiting resistance R1, photoelectrical coupler OPT1；Photoelectrical coupler OPT1's is defeated
It is in parallel with the major loop both ends of the first thyristor TR1 by current-limiting resistance R1 to enter end, the output terminal of photoelectrical coupler OPT1 and control
Circuit (A) connection processed.
Second voltage detection circuit (B2)：Including current-limiting resistance R2, photoelectrical coupler OPT2；Photoelectrical coupler OPT2's is defeated
It is in parallel with the major loop both ends of the second thyristor TR2 by current-limiting resistance R2 to enter end, the output terminal of photoelectrical coupler OPT2 and control
Circuit (A) connection processed.
The course of work：By the present apparatus for exemplified by mechanical switch SW1 arc extinguishings, control circuit (A) must be electric, in mechanical switch
During the Operating In Persistent Current Mode of SW1, since three-phase potential difference is 120 degree, closed in contact SW1-1, SW1-2 of mechanical switch SW1
Before conjunction, when first voltage detection circuit (B1), second voltage detection circuit (B2) output loop difference, ends, as long as mechanical switch
When there is closure situation in contact SW1-1, SW1-2 of SW1, first voltage detection circuit (B1), second voltage detection circuit (B2)
Output loop ends simultaneously, and control circuit (A) controls two thyristor TR1, TR2 conductings, realizes that being closed spring to mechanical switch goes out
The purpose of arc, two thyristor TR1, TR2 ON times can be short up to 1 millisecond during spring arc extinguishing is closed to mechanical switch SW1
It is interior；In the course of work that mechanical switch SW1 is disconnected, when Current Transmit output has thyristor TR2 Continuity signals, control electricity
Road (A) controls two thyristor TR1, TR2 cut-offs, realizes the purpose to mechanical switch disconnection arc extinguishing, two thyristor TR1, TR2 are disconnected
Opening arc extinguishing ON time can be short up to half of cycle.
In the present embodiment, two voltage detecting circuits will use full wave voltage detection circuit, photoelectrical coupler OPT1, OPT2
Using double light emitting diode photoelectrical couplers, two photoelectrical coupler input terminal reverse parallel connections can also be used to use.
As shown in figure 4, the four of the embodiment of the present invention, for a kind of electronic arc eliminating that mechanical switch arc extinguishing is controlled for three-phase three
Device, including control circuit (A), Current Transmit, the first thyristor TR1, the second thyristor TR2, the 3rd thyristor TR3,
First voltage detection circuit (B1), second voltage detection circuit (B2), tertiary voltage detection circuit (B3).First voltage detection electricity
Road (B1) is in parallel with the major loop of the first thyristor TR1, second voltage detection circuit (B2) and the major loop of the second thyristor TR2
Parallel connection, tertiary voltage detection circuit (B3) is in parallel with the major loop of the 3rd thyristor TR3, first voltage detection circuit (B1),
Two voltage detecting circuits (B2), the output terminal of tertiary voltage detection circuit (B3) are connected with control circuit (A), Current Transmit
It is connected with the major loop of the second thyristor TR2, for detecting the conducting electric current of the second thyristor TR2, thyristor TR1, TR2, TR3
Major loop both ends the first contact SW1-1, the second contact SW1-2, the 3rd contact SW1-3 both ends with mechanical switch SW1 respectively
Connection, J1 and J4, J2 and J5, J3 and J6 are respectively the input and output endpoint of three-phase major loop, and mechanical switch SW1 is and the present apparatus
The input terminal of the major loop of the mechanical switch of the required arc extinguishing of connection, control circuit (A) power input and power semiconductor connects
Connect (note：The input terminal of the major loop of wherein two of three thyristor TR1, TR2, TR3 can be selected as power input).
First voltage detection circuit (B1)：Including current-limiting resistance R1, photoelectrical coupler OPT1；Photoelectrical coupler OPT1's is defeated
Enter end and pass through current-limiting resistance R1 (the i.e. input and output both ends companies of major loop in parallel with the major loop both ends of the first thyristor TR1
Connect), the output terminal of photoelectrical coupler OPT1 is connected with control circuit (A).
Second voltage detection circuit (B2)：Including current-limiting resistance R2, photoelectrical coupler OPT2；Photoelectrical coupler OPT2's is defeated
It is in parallel with the major loop both ends of the second thyristor TR2 by current-limiting resistance R2 to enter end, the output terminal of photoelectrical coupler OPT2 and control
Circuit (A) connection processed.
Tertiary voltage detection circuit (B3)：Including current-limiting resistance R3, photoelectrical coupler OPT3；Photoelectrical coupler OPT3's is defeated
It is in parallel with the major loop both ends of the 3rd thyristor TR3 by current-limiting resistance R3 to enter end, the output terminal of photoelectrical coupler OPT3 and control
Circuit (A) connection processed.
The course of work：By the present apparatus for exemplified by mechanical switch SW1 arc extinguishings, control circuit (A) must be electric, in mechanical switch
During the Operating In Persistent Current Mode of SW1, before the closure of mechanical switch SW1, since three-phase potential difference is 120 degree, first voltage inspection
End when slowdown monitoring circuit (B1), second voltage detection circuit (B2), tertiary voltage detection circuit (B3) output loop difference, as long as machine
When closure situation occurs in contact SW1-1, SW1-2, SW1-3 of tool switch SW1, cut simultaneously in three voltage detecting circuit output loops
When only, control circuit (A) controls three thyristor TR1, TR2, TR3 conductings, realizes the purpose that spring arc extinguishing is closed to mechanical switch,
Three thyristor TR1, TR2, TR3 ON times can be short up in 1 millisecond during spring arc extinguishing is closed to mechanical switch SW1；Machine
In the course of work that tool switch SW1 is disconnected, when Current Transmit output has thyristor TR2 Continuity signals, control circuit (A)
Three thyristor TR1, TR2, TR3 is controlled to end, realize the purpose to mechanical switch disconnection arc extinguishing, three thyristor TR1, TR2, TR3
It can be short up to half of cycle in disconnection arc extinguishing ON time.
In above four embodiments, the major loop of current transformer and thyristor connects, and detects the electric conduction of thyristor
Stream, has the following advantages：
1. using the current signal for the current transformer feedback being connected with thyristor, disconnected for detecting mechanical switch,
When detecting that mechanical switch disconnects, control circuit control thyristor cut-off is realized the purpose that thyristor quickly ends, is greatly reduced
Working time of the thyristor during disconnection arc extinguishing.
2. since thyristor is by current work time short only Millisecond, the major loop conducting wire very little of thyristor can also be held
Great operating current is carried, therefore micro-transformer of current can be selected in current transformer, it, can also be straight using punching connection mode
It connects and mode is connected in series using major loop conducting wire and current transformer, current transformer has the characteristics that small, at low cost, side
Just with whole device as an entirety.
As shown in figure 5, the five of the embodiment of the present invention, it goes out for a kind of electronics that formula mechanical switch arc extinguishing is controlled for three-phase two
Arc device (note：One phase inlet wire of its threephase load is directly connected to another phase power supply), including control circuit (A), the first brilliant lock
Pipe TR1, the second thyristor TR2, first voltage detection circuit (B1), second voltage detection circuit (B2).First voltage detection electricity
Road (B1) is in parallel with the major loop of the first thyristor TR1, second voltage detection circuit (B2) and the major loop of the second thyristor TR2
Parallel connection, first voltage detection circuit (B1), the output terminal of second voltage detection circuit (B2) are connected with control circuit (A), brilliant lock
The major loop both ends of pipe TR1, TR2 are connected respectively with the first contact SW1-1 of mechanical switch SW1, the second contact SW1-2 both ends,
J1 and J3, J2 and J4 are respectively the input and output endpoint of two-phase major loop, and mechanical switch SW1 is goes out needed for being connected with the present apparatus
The mechanical switch of arc, control circuit (A) power input are connected with the input terminal of the major loop of two power semiconductor TR1, TR2.
First voltage detection circuit (B1)：Including current-limiting resistance R1, voltage transformer T1；The input terminal of voltage transformer T1
It is in parallel with the major loop both ends of the first thyristor TR1 by current-limiting resistance R1, the output terminal and control circuit of voltage transformer T1
(A) connect.
Second voltage detection circuit (B2)：Including current-limiting resistance R2, voltage transformer T2；The input terminal of voltage transformer T2
It is logical
The major loop both ends that current-limiting resistance R2 is crossed with the second thyristor TR2 are in parallel, the output terminal of voltage transformer T2 and control
Circuit (A) connection processed.
The course of work：By the present apparatus for exemplified by mechanical switch SW1 arc extinguishings, control circuit (A) must be electric, in mechanical switch
During the Operating In Persistent Current Mode of SW1, as long as there is closure situation in contact SW1-1, SW1-2 of mechanical switch SW1, first voltage inspection
Without electric signal output, control circuit (A) provides two brilliant lock of pulse signal control for slowdown monitoring circuit (B1), second voltage detection circuit (B2)
Pipe TR1, TR2 are turned on, and realize the purpose that spring arc extinguishing is closed to mechanical switch, and spring arc extinguishing mistake is being closed to mechanical switch SW1
Two thyristor TR1, TR2 ON times can be short up in 1 millisecond in journey；In the course of work that mechanical switch SW1 is disconnected, in the first electricity
When any output of pressure detection circuit (B1), second voltage detection circuit (B2) has electric signal, control circuit (A) provides pulse signal
Two thyristor TR1, TR2 is controlled to turn on, realize the purpose to mechanical switch disconnection arc extinguishing, two thyristor TR1, TR2 go out in disconnection
Arc ON time can be short up to half of cycle.
In the present embodiment, first voltage detection circuit (B1), second voltage detection circuit (B2) are opened for detecting machinery
Contact SW1-1, SW1-2 open and close of SW1 is closed, two voltage detecting circuits employ voltage transformer, break to mechanical switch
Detection is opened with response speed quickly, reduces lag time of the present apparatus in disconnection arc extinguishing.
The input terminal of above example voltage detecting circuit is connected with the input and output both ends of the major loop of thyristor,
When load be not for motor or capacitance when or during infrequently switching such energy storage load, voltage detecting circuit input terminal can be with crystalline substance
The major loop load end connection of brake tube, operation principle are identical；The current sensor of above example detection electric current employs electric current
Mutual inductor, have the advantages that it is at low cost, can also other detection electric currents current sensor, such as Hall sensor.
The control circuit of electronic arc-suppressor of the present invention by the contact closure condition to mechanical switch due to being examined
It surveys, without obtaining synchronizing signal by contactor control coil, the input power of control circuit can be by the major loop of thyristor
The mode of connection that input terminal provides is advantageously used for the mechanical switch arc extinguishing without operation control coil such as breaker, has wiring
Less, the characteristics of wide adaptation range.
Claims (25)
1. a kind of electronic arc-suppressor, including the thyristor in parallel with the contact both ends of mechanical switch, it is characterized in that：
The major loop connection voltage detecting circuit of the thyristor, output terminal and the control circuit of the voltage detecting circuit connect
It connects, the voltage detecting circuit is used to detect the contact closure；
The control circuit is connected with the control terminal of the thyristor, and the control circuit is detected in the voltage detecting circuit
The turn on thyristors control signal is provided during the contact closure, for contact closure spring arc extinguishing；
The control circuit is built-in with microcontroller, the major loop connection current sensor of the thyristor, the current sense
Device detects the conducting electric current of the thyristor, is disconnected for detecting the contact, and the voltage detecting circuit and the electric current pass
The output signal of sensor is transferred to the microcontroller, and the microcontroller at least one exports signal and is transferred to the thyristor
Control terminal, the microcontroller provides the turn on thyristors when the voltage detecting circuit detects the contact closure
Control signal, the microcontroller close the turn on thyristors control when the current sensor detects that the contact disconnects
Signal processed.
2. electronic arc-suppressor according to claim 1, it is characterized in that：The voltage detecting circuit detects for full wave voltage
Circuit.
3. electronic arc-suppressor according to claim 1, it is characterized in that：The voltage detecting circuit is used to detect the machine
Tool switch disconnects, and the control circuit closes the crystalline substance when the voltage detecting circuit detects that the mechanical switch disconnects
Brake tube conductivity control signal.
4. electronic arc-suppressor according to claim 1, it is characterized in that：The voltage detecting circuit includes a resistance, one
Photoelectrical coupler, the resistance are connected with the control terminal of the photoelectrical coupler.
5. electronic arc-suppressor according to claim 1, it is characterized in that：The control circuit is useful for inputting the machinery
The input port of switching synchronization signals.
6. electronic arc-suppressor according to claim 1, it is characterized in that：The input terminal of the voltage detecting circuit with it is described
The input and output both ends connection of the major loop of thyristor.
7. electronic arc-suppressor according to claim 1, it is characterized in that：The input terminal of the voltage detecting circuit with it is described
The major loop load end connection of thyristor.
8. according to the electronic arc-suppressor described in claim 1 to 7 any claim, it is characterized in that：The control circuit is led to
It crosses an at least electronic switch to be connected with the driving circuit of the thyristor, drives the drive signal of the turn on thyristors by described
The major loop of thyristor is transferred to the control pole of the thyristor, the electronics by the series circuit being made of capacitance and resistance
It switchs to control the drive signal.
9. electronic arc-suppressor according to claim 8, it is characterized in that：The electronic switch is photoelectrical coupler.
10. electronic arc-suppressor according to claim 8, it is characterized in that：The series circuit is connected in parallel on institute by device
State the input and output both ends of the major loop of thyristor.
11. a kind of electronic arc-suppressor, including the thyristor in parallel with the contact both ends of mechanical switch, it is characterized in that：
The major loop connection voltage detecting circuit of the thyristor, output terminal and the control circuit of the voltage detecting circuit connect
It connects, the voltage detecting circuit is used to detect the contact closure；
The control circuit is connected with the control terminal of the thyristor, and the control circuit is detected in the voltage detecting circuit
The turn on thyristors control signal is provided during the contact closure, for contact closure spring arc extinguishing；
The voltage detecting circuit disconnects for detecting the mechanical switch, and the control circuit is examined in the voltage detecting circuit
When measuring the mechanical switch disconnection, the turn on thyristors control signal is closed.
12. electronic arc-suppressor according to claim 11, it is characterized in that：The voltage detecting circuit is examined for full wave voltage
Slowdown monitoring circuit.
13. electronic arc-suppressor according to claim 11, it is characterized in that：The major loop connection electric current of the thyristor passes
Sensor, the output terminal of the current sensor are connected with the control circuit, and the current sensor is by detecting the brilliant lock
The conducting electric current of pipe disconnects for detecting the contact, and the control circuit detects the contact in the current sensor
The turn on thyristors control signal is closed during disconnection.
14. electronic arc-suppressor according to claim 13, it is characterized in that：The current sensor is current transformer.
15. electronic arc-suppressor according to claim 11, it is characterized in that：The voltage detecting circuit include a resistance,
One photoelectrical coupler, the resistance are connected with the control terminal of the photoelectrical coupler.
16. electronic arc-suppressor according to claim 11, it is characterized in that：The input terminal of the voltage detecting circuit and institute
State the input and output both ends connection of the major loop of thyristor.
17. electronic arc-suppressor according to claim 11, it is characterized in that：The input terminal of the voltage detecting circuit and institute
State the major loop load end connection of thyristor.
18. according to the electronic arc-suppressor described in claim 11 to 17 any claim, it is characterized in that：The control circuit
It is connected by an at least electronic switch with the driving circuit of the thyristor, drives the drive signal of the turn on thyristors by institute
The major loop for stating thyristor is transferred to the control pole of the thyristor, the electricity by the series circuit being made of capacitance and resistance
Sub switch is used to control the drive signal.
19. electronic arc-suppressor according to claim 18, it is characterized in that：The electronic switch is photoelectrical coupler.
20. electronic arc-suppressor according to claim 18, it is characterized in that：The series circuit is connected in parallel on institute by device
State the input and output both ends of the major loop of thyristor.
21. a kind of electronic arc-suppressor, including the thyristor in parallel with the contact both ends of mechanical switch, it is characterized in that：
The major loop connection voltage detecting circuit of the thyristor, output terminal and the control circuit of the voltage detecting circuit connect
It connects, the voltage detecting circuit is used to detect the contact closure；
The control circuit is connected with the control terminal of the thyristor, and the control circuit is detected in the voltage detecting circuit
The turn on thyristors control signal is provided during the contact closure, for contact closure spring arc extinguishing；
The voltage detecting circuit disconnects for detecting the contact, and the control circuit is detected in the voltage detecting circuit
When the contact disconnects, the thyristor pulse signal is provided.
22. electronic arc-suppressor according to claim 21, it is characterized in that：The voltage detecting circuit includes at least an electricity
Press mutual inductor.
23. electronic arc-suppressor according to claim 21, it is characterized in that：The input terminal of the voltage detecting circuit and institute
State the input and output both ends connection of the major loop of thyristor.
24. electronic arc-suppressor according to claim 21, it is characterized in that：The input terminal of the voltage detecting circuit and institute
State the major loop load end connection of thyristor.
25. electronic arc-suppressor according to claim 21, it is characterized in that：The input power of the control circuit is by described
The input terminal of the major loop of thyristor provides.
Applications Claiming Priority (15)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2014100934552 | 2014-03-07 | ||
| CN2014100934711 | 2014-03-07 | ||
| CN2014201166137 | 2014-03-07 | ||
| CN201420115758 | 2014-03-07 | ||
| CN201410093471 | 2014-03-07 | ||
| CN2014201157585 | 2014-03-07 | ||
| CN201410093455 | 2014-03-07 | ||
| CN201420116613 | 2014-03-07 | ||
| CN201410150333 | 2014-04-04 | ||
| CN2014101503332 | 2014-04-04 | ||
| CN201420178613X | 2014-04-04 | ||
| CN201420178613 | 2014-04-04 | ||
| CN2014103996584 | 2014-08-07 | ||
| CN201410399658 | 2014-08-07 | ||
| CN201410719920.9A CN104392859B (en) | 2014-03-07 | 2014-11-22 | Electronic arc-suppressor |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410719920.9A Division CN104392859B (en) | 2014-03-07 | 2014-11-22 | Electronic arc-suppressor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106024520A CN106024520A (en) | 2016-10-12 |
| CN106024520B true CN106024520B (en) | 2018-05-29 |
Family
ID=52610742
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420737815.3U Withdrawn - After Issue CN204242870U (en) | 2014-03-07 | 2014-11-22 | Electronic arc-suppressor |
| CN201410719920.9A Active CN104392859B (en) | 2014-03-07 | 2014-11-22 | Electronic arc-suppressor |
| CN201610410574.5A Active CN106024520B (en) | 2014-03-07 | 2014-11-22 | Electronic arc-suppressor |
Family Applications Before (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420737815.3U Withdrawn - After Issue CN204242870U (en) | 2014-03-07 | 2014-11-22 | Electronic arc-suppressor |
| CN201410719920.9A Active CN104392859B (en) | 2014-03-07 | 2014-11-22 | Electronic arc-suppressor |
Country Status (2)
| Country | Link |
|---|---|
| CN (3) | CN204242870U (en) |
| WO (1) | WO2015131718A1 (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204242870U (en) * | 2014-03-07 | 2015-04-01 | 广州市金矢电子有限公司 | Electronic arc-suppressor |
| CN105428117B (en) * | 2014-12-11 | 2017-06-30 | 广州市金矢电子有限公司 | Arc extinguishing device |
| WO2016180345A1 (en) * | 2015-05-13 | 2016-11-17 | 广州市金矢电子有限公司 | Two-terminal arc extinguishing device and hybrid switch |
| CN106712756B (en) * | 2016-01-24 | 2018-02-09 | 广州市金矢电子有限公司 | Composite switch |
| WO2017125057A1 (en) * | 2016-01-24 | 2017-07-27 | 广州市金矢电子有限公司 | Power device driving apparatus |
| CN106253256B (en) * | 2016-08-04 | 2018-12-04 | 浙江大学 | A kind of process chamber breakdown crowbar circuit of high-pressure pulse electric liquid foodstuffs sterilization |
| CN110993403B (en) * | 2017-07-24 | 2023-07-25 | 广州市金矢电子有限公司 | DC arc extinguishing circuit and device |
| WO2019029550A1 (en) * | 2017-08-10 | 2019-02-14 | 广州市金矢电子有限公司 | Arc extinguishing method and apparatus |
| CN111527575B (en) * | 2017-09-14 | 2023-01-10 | 广州市金矢电子有限公司 | DC arc-extinguishing device |
| AU2019341286B2 (en) | 2018-09-19 | 2023-01-19 | Qiaoshi Guo | Arc-extinguishing circuit and apparatus |
| CN109216070A (en) * | 2018-10-12 | 2019-01-15 | 东莞立讯智连电子科技有限公司 | A kind of arc extinguishing DC contactor |
| WO2020083181A1 (en) * | 2018-10-22 | 2020-04-30 | 郭桥石 | Alternating-current arc extinguishing circuit and device, and switching system |
| CN112243555B (en) * | 2019-05-18 | 2024-06-28 | 广州市金矢电子有限公司 | Arc extinguishing circuit and device |
| CN110223810B (en) * | 2019-06-12 | 2020-08-25 | 西南交通大学 | Self-arc-extinguishing device |
| CN110967577B (en) * | 2019-10-30 | 2022-07-08 | 浙江工业大学 | Device and method for evaluating arc extinguishing effect of arc extinguisher |
| CN113791340B (en) * | 2021-08-31 | 2024-07-23 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Bidirectional arc voltage measuring device and method for high-voltage direct-current vacuum circuit breaker |
| CN114540774B (en) * | 2022-01-29 | 2022-09-27 | 深圳市瀚强科技股份有限公司 | Power supply and arc processing method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2085092U (en) * | 1991-03-01 | 1991-09-18 | 赵为政 | A.c. arc-suppressing electronic module |
| US6643112B1 (en) * | 1999-06-08 | 2003-11-04 | Crouzet Automatismes | Semiconductor switch-assisted electromechanical relay |
| CN2720596Y (en) * | 2004-08-10 | 2005-08-24 | 黄苹 | Three-phase ac. dynamic switch |
| CN101266888A (en) * | 2008-04-30 | 2008-09-17 | 哈尔滨工业大学 | A high-power mixed DC contactor and its control method |
| CN103021739A (en) * | 2012-11-30 | 2013-04-03 | 西安交通大学 | Hybrid direct-current circuit breaker |
| CN104392859B (en) * | 2014-03-07 | 2017-04-05 | 广州市金矢电子有限公司 | Electronic arc-suppressor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08148072A (en) * | 1994-11-18 | 1996-06-07 | Alps Electric Co Ltd | Switch with built-in breaker |
| CN201440390U (en) * | 2009-06-03 | 2010-04-21 | 郭桥石 | Non-surge arc-extinguishing device |
-
2014
- 2014-11-22 CN CN201420737815.3U patent/CN204242870U/en not_active Withdrawn - After Issue
- 2014-11-22 CN CN201410719920.9A patent/CN104392859B/en active Active
- 2014-11-22 CN CN201610410574.5A patent/CN106024520B/en active Active
-
2015
- 2015-01-27 WO PCT/CN2015/071587 patent/WO2015131718A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2085092U (en) * | 1991-03-01 | 1991-09-18 | 赵为政 | A.c. arc-suppressing electronic module |
| US6643112B1 (en) * | 1999-06-08 | 2003-11-04 | Crouzet Automatismes | Semiconductor switch-assisted electromechanical relay |
| CN2720596Y (en) * | 2004-08-10 | 2005-08-24 | 黄苹 | Three-phase ac. dynamic switch |
| CN101266888A (en) * | 2008-04-30 | 2008-09-17 | 哈尔滨工业大学 | A high-power mixed DC contactor and its control method |
| CN103021739A (en) * | 2012-11-30 | 2013-04-03 | 西安交通大学 | Hybrid direct-current circuit breaker |
| CN104392859B (en) * | 2014-03-07 | 2017-04-05 | 广州市金矢电子有限公司 | Electronic arc-suppressor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104392859A (en) | 2015-03-04 |
| CN204242870U (en) | 2015-04-01 |
| CN104392859B (en) | 2017-04-05 |
| WO2015131718A1 (en) | 2015-09-11 |
| CN106024520A (en) | 2016-10-12 |
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