Electromagnetic relay arc extinguishing circuit

Abstract

The invention discloses an electromagnetic relay arc extinguishing circuit. A first wiring and a second wiring are leaded out from an input terminal respectively. On one hand, the first wiring is connected with a voltage converter D2, a resistor R6, a diode V3 and a capacitor C2 in order; on the other hand, the first wiring is connected with am optical coupler V4, an inverter D3, a Zener diode V6, and a triode V7 in order, and then connects with an IGBT V9 grid; the second wiring is connected with a resistor R3 and a capacitor C1 which are connected in parallel, the resistor R3 and the capacitor C1 are connected to a positive input terminal of a comparator D1 through lead, an output terminal of the comparator D1 connects with an input terminal of a electromagnetic relay K1, the input terminal of the electromagnetic relay K1 is connected with a diode V1 in parallel, and an output terminal of the electromagnetic relay K1 connects with a collector electrode and an emitter electrode at one point as an output terminal. The electromagnetic relay arc extinguishing circuit has a reasonable structure, arc extinguishing of the electromagnetic relay under large voltage is effectively realized, and an arcing problem of contact of the electromagnetic relay in pull-in and release state is avoided. The circuit is reliable in working.

Description

technical field [0001] The invention relates to an electromagnetic relay, in particular to an arc suppressing circuit for an electromagnetic relay. Background technique [0002] The contacts of the electromagnetic relay are prone to arc sparks during the action process, and the arc sparks ablate the contacts, resulting in poor contact of the contacts, and the poor contact of the contacts further generates arc sparks, so repeated amplification makes the service life of the electromagnetic relay short , The arc extinguishing problem has always been the main problem to be solved by the electromagnetic relay. However, the electromagnetic relay needs to realize the simplification of the structure and the miniaturization of the volume, and it also needs to work under the condition of high voltage load, so the phenomenon of contact arcing (below) is more serious, which is difficult to solve. Contents of the invention [0003] The purpose of the present invention is to pr...

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Problems solved by technology

[0002] The contacts of the electromagnetic relay are prone to arc sparks during the action process, and the arc sparks ablate the contacts, resulting in poor contact of the contacts, and the poor contact of the contacts further generates arc sparks, so repeated amplification makes the service life of the electromagnetic relay short , the arc extinguishing problem has always been the main problem to be solved by the electromagnetic relay

However, the electromagnetic relay needs to realize the simplification of the structure and the miniaturization of the volume, and it also needs to work under the condition of high voltage load. The phenomenon of contact arcing (below) is more serious, which is difficult to solve.

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