A circuit that makes the two switches standby for each other and automatically delays switching after tripping

Abstract

The invention provides a circuit capable of enabling two switches to be spare to each other and automatically delaying switching after tripping. The circuit comprises a first switch and a second switch and is characterized by further comprising a first input end, a second input end, a third input end, a first switching output end, a second switching output end, a first voltage detection module, a second voltage detection module, a third voltage detection mould, a voltage conversion module, a comparing and judging module, a driving module, a switch connection module and a power supply module which are independent of each other, wherein the switch connection module comprises two electronically-controlled double-pole-double-throw switches; one double-pole-double-throw switch is serially connected between the first switching output end and the second input end; the other double-pole-double-throw switch is serially connected between the second switching output end and the third input end; and switched-on and switched-off states of the selected serially-connected double-pole-double-throw switches are opposite. The circuit has the beneficial effects that two switches are spare to each other, can be continuously and repeatedly used and do not need to be manually switched on at the site after tripping for each time.

Description

technical field [0001] The invention relates to the field of electric power electronics, in particular to a circuit which enables two switches to serve as backup for each other and automatically delays switching after tripping. Background technique [0002] A number of circuit breakers with short-circuit protection function are usually installed in the low-voltage power distribution box or low-voltage power distribution cabinet. When the circuit breaker trips automatically, people can generally quickly judge whether it is affected by the excessive power of the back-end load, and take corresponding measures. Power consumption adjustment measures, such as disconnecting the power connection of high-power load equipment or closing other unimportant load connections, and re-closing the tripped switch after a certain time interval, the current circuit breaker only has an independent switch function, It usually requires personnel to re-close the trip switch at the distribution box....

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies in the prior art, the present invention provides a circuit that enables the two switches to serve as backups for each other and automatically delays switching after tripping, so as to solve the problem that the tripping switch has a backup switch within a certain time interval.

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