Switch crowbar circuit and control method thereof

An arc-extinguishing circuit and arc-switching technology, which is applied to circuits, electrical switches, electrical components, etc., can solve problems such as unfavorable general use, unsatisfactory arc-extinguishing effect, and inability to achieve better arc-extinguishing effect, and achieves simple structure and guaranteed reliability, improved performance

CN101533727BInactive Publication Date: 2011-04-20SUZHOU CHENCAI TEXTILE RES & DEV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2011-04-20
Estimated Expiration
Not applicable · inactive patent

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    Figure 3
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Abstract

A switch crowbar circuit comprises a main contact, and accessory circuits are connected between the first electrode end and the second electrode end of the main contact in parallel. The switch crowbar circuit is characterized in that the accessory circuits comprise accessory contacts, current-limiting resistors and a three-end controllable circuit including a first voltage end, a second voltage end and a control end; the first voltage end is connected with the first electrode end, the second voltage end is connected with the second electrode end, the control end is connected with the first end of the accessory contact, and the second end of the accessory contact is connected with the first voltage end through a current-limiting resistor; when a forward voltage is supplied between the first voltage end and the second voltage end and the control end receives trigger signals, the controllable circuit is conducted; when a backward voltage is supplied between the first voltage end and the second voltage end and the control end receives trigger signals, the controllable circuit is conducted; when a forward or backward voltage is supplied between the first voltage end and the second voltage end and the control end has not trigger signals, the controllable circuit is cut off. Compared with the existing technology, the invention uses a three-port controllable circuit with control end to receive trigger signals to conduct electricity while the accessory contacts are closed so that the working current flows from the controllable circuit, thereby damaging the arcing conditions of maincontact, efficiently eliminating the voltaic arc when the main contact is closed; the circuit structure is simple, the installation and use are convenient, the arc-suppressing effect is good, and theinvention is propitious to generally wide application.
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Description

technical field

[0001] The invention relates to a switch arc suppressing circuit and a control method for preventing a switch electric device from drawing arc when it is closed or disconnected. Background technique

[0002] Load switches, sockets, breakers, AC contactors, relays, etc. are commonly used switching appliances. These switching appliances mostly use the contact and disconnection of mechanical contacts to realize the conduction or breaking of the working circuit. However, the mechanical contacts of the above-mentioned switching appliances are at the moment of closing and separating due to the small distance between the contacts and the electric field strength is very large. At this time, arcing (discharge) phenomenon will occur, and frequent arcing will burn the switch contacts, and then It affects the service life of the switch and also reduces the reliability of the circuit. Therefore, how to effectively extinguish the arc is a problem that needs to be solved ur...

Examples

Embodiment 1

[0052] Embodiment one, such as image 3 Shown:

[0053] The arc suppression circuit specifically includes a main contact K1, an auxiliary contact K2, a current-limiting resistor R1 and a bidirectional thyristor BCR, wherein the main contact K1 has a first electrode terminal P1 and a second electrode terminal P2, which are bidirectionally controllable The anode of the silicon BCR is connected to the first electrode terminal P1 of the main contact K1, the cathode of the bidirectional thyristor BCR is connected to the second electrode terminal P2 of the main contact K1, and the control terminal of the bidirectional thyristor BCR is connected to the auxiliary contact K2 The first terminal a of the auxiliary contact K2 is connected to the first electrode terminal P1 of the main contact K1 through the current limiting resistor R1.

[0054] working principle:

[0055] Closing process: the auxiliary contact K2 is closed first, at this time, the control terminal of the bidirectional ...

Embodiment 2

[0058] Embodiment two, such as Figure 4 Shown:

[0059] The difference between this embodiment and Embodiment 1 is that the bidirectional thyristor BCR is replaced by two parallel-connected first one-way thyristor SCR1 and second one-way thyristor SCR2, wherein the first one-way thyristor SCR2 The anode of the silicon controlled rectifier SCR1 is connected to the first electrode terminal P1 of the main contact K1, the cathode of the first one-way thyristor SCR1 is connected to the second electrode terminal P2 of the main contact K1, and the first one-way thyristor SCR1 The control terminal is connected to the first terminal a of the auxiliary contact K2; the anode of the second one-way thyristor SCR2 is connected to the second electrode terminal P2 of the main contact K1, and the cathode of the second one-way thyristor SCR2 is connected to the main contact The first electrode terminal P1 of the head K1 is connected, and the control terminal of the second one-way thyristor SC...

Embodiment 3

[0061] Embodiment three, such as Figure 5 Shown:

[0062] The arc suppression circuit includes a main contact K1, an auxiliary contact K2, a current limiting resistor R1, a capacitor C, a time delay resistor R2, an NPN transistor BG, a first voltage regulator tube D1 and a second voltage regulator tube D2, wherein, The main contact K1 has a first electrode terminal P1 and a second electrode terminal P2. One way of the base of the triode BG is connected to the first terminal a of the auxiliary contact K2, and the other way is connected to the cathode of the first voltage regulator tube D1. The triode BG The emitter of the transistor is connected to the second electrode terminal P2 of the main contact K1, the collector of the triode BG is connected to one end of the delay resistor R2, and the other end of the delay resistor R2 is connected to the first terminal of the main contact K1 after passing through the capacitor C One electrode terminal P1 is connected, the collector of...