Switching circuit, power system and power supply system

Abstract

The embodiment of the invention provides a switching circuit, a power system and a power supply system. The switching circuit comprises a first input end (111), a second input end (112), a third input end (113), a fourth input end (114), a switching module (120), a first isolating circuit (131) and a control module (140), wherein the first input end (111) and the second input end (112) are used for being connected with a first power supply; the third input end (113) and the fourth input end (114) are used for being connected with a second power supply; the switching module (120) comprises a first switching circuit (121) and a second switching circuit (122); and the control module (140) is used for controlling the first isolating circuit (131) to be switched on / off respectively when the first power supply is powered on / off. In the embodiment of the invention, the first isolating circuit is arranged between the switching module and the input ends of the first power supply, so that the security performance of products can be improved.

Description

technical field [0001] Embodiments of the present invention relate to the circuit field, and more specifically, to a switch circuit, a power supply system, and a power supply system. Background technique [0002] In order to improve the reliability of power consumption, with the emergence of mixed power supply of AC (Alternating Current, AC) and DC (Direct Current, DC), for example, high-voltage direct current (high-voltage direct current, HVDC), the load circuit can be designed with two or more Power input, one of the two or more power inputs is AC input, and the other is DC input. Inside the power supply equipment, AC and DC are switched. [0003] In the prior art, switching between AC and DC can be realized in various forms. For example, the switching between AC and DC is realized by switching on and off between two sets of parallel semiconductor switching devices and mechanical switching devices. Although this method can solve the problem of arc generation in existing ...

AI Technical Summary

Problems solved by technology

Although this method can solve the problem of arc generation in existing mechanical switching devices (such as relays) and the problem of large heat generation in semiconductor switching devices, however, in this method, there is a problem of current backflow, that is, between the two circuits of AC and DC. In between, isolation is achieved by semiconductor devices, and current backflow is prone to occur when semiconductor switching devices break down, posing potential dangers

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