A relay arc extinguishing circuit and method

Abstract

The invention provides a relay arc-extinguishing circuit and method, and the circuit comprises a power module, a fuse, a bidirectional silicon controlled rectifier and a relay. The bidirectional silicon controlled rectifier and the fuse are connected in series, and then are connected to two ends of a power module with the relay in a parallel manner. The power module supplies power to the bidirectional silicon controlled rectifier and the relay. The circuit provided by the invention can achieve the arc extinguishing of the relay, and achieves the purpose of prolonging the service life of the relay. The circuit is additionally provided with the current fuse, and the current fuse can prevent the failure of the bidirectional silicon controlled rectifier from causing the hidden troubles of thequality of product burn-in. The 1206 packaged current fuse is employed, thereby saving the space of a PCB. The fuse is convenient for processing, is good in protection effect, and is high in protection effect consistency.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a relay arc extinguishing circuit and method. Background technique [0002] In the prior art, when a relay is used to control AC high-power load products, a high-temperature and high-voltage arc will be generated when the relay contact is disconnected. This arc will cause irreversible damage to the relay contact and directly affect the service life of the relay. The existing method of extinguishing the arc of the relay through the thyristor can achieve the effect of arc extinguishing on the relay, but it ignores the quality problems of the thyristor itself. In the case of breakdown, the product will have uncontrolled conduction, and if there is no protection device, serious safety accidents such as burn-in will occur. Contents of the invention [0003] In order to solve the above problems, the present invention provides a relay arc extinguishing circuit, including a power ...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, when relays are used to control AC high-power load products, high-temperature and high-voltage arcs will be generated when the relay contacts are disconnected. This arc will cause irreversible damage to the contacts of the relay and directly affect the service life of the relay.

The existing method of extinguishing the arc of the relay through the thyristor can achieve the effect of arc extinguishing on the relay, but it ignores the quality problems of the thyristor itself. In the case of breakdown, the product will have uncontrolled conduction, and if there is no protection device, serious safety accidents such as burn-in will occur

Images