Current feedback electronic arc-control device

Abstract

The invention belongs to the field of electricity and relates to a current feedback electronic arc-control device, in particular to the current feedback electronic arc-control device suitable for performing an arc-control function on mechanical switches. The current feedback electronic arc-control device comprises a power semi-conductor device connected in parallel with a mechanical switch and a power supply circuit, wherein a main circuit of the power semi-conductor device is connected with a current sensor and is used for detecting whether the mechanical switch is turned on or turned off; an output signal of the current sensor is connected with a control circuit, and a control end of the power semi-conductor device is connected with the control circuit; the power supply circuit is connected with the control circuit and provides power for the control circuit; the control circuit controls the power semi-conductor device to be shut off when it is detected that the mechanical switch is turned off. The current feedback electronic arc-control device has the advantages that the power-on time of the power semi-conductor device is short and the reliability is high.

Description

technical field [0001] The current feedback electronic arc extinguishing device of the present invention belongs to the electrical field, in particular a current feedback electronic arc extinguishing device suitable for arc extinguishing in contactors, relays, circuit breakers and other mechanical switches. Background technique [0002] At present, in the electrical control system, mechanical switches such as contactors and relays are widely used to control the on-off of the load. However, due to the arc extinguishing grid used for ordinary arc extinguishing, it needs to pull the breaking arc to a certain length before it can work. The effect is poor, and the arc is large when breaking the load, which leads to the disadvantage that the contacts are easy to burn. [0003] For this reason, arc extinguishing devices for mechanical switch arc extinguishing have appeared, such as the patent No. CN01201907.0, named "electronic arc extinguisher"; Contactor passive switch drive con...

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Problems solved by technology

[0004] Since there is an uncertain delay time from the power loss of the control coil of the contactor to the breaking of the mechanical switch, in order to ensure that the thyristor is turned off after the mechanical switch is broken to ensure reliable arc extinguishing, the thyristor needs to be turned on for a long time (generally in the tens of Milliseconds or more), this kind of arc extinguishing control method that adopts the control method of delaying the closing of the control signal after the mechanical switch is broken, will inevitably increase the unnecessary and redundant conduction working time of the thyristor, and the long conduction working time of the thyristor will lead to the overload of the entire arc extinguishing device Poor capability and low reliability

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