A magnetically isolated high-voltage bus high-speed response overcurrent protection circuit

Abstract

A magnetically isolated power supply bus high-speed response overcurrent protection circuit of the present invention includes a bus switch field effect transistor, an isolated high-speed bus current acquisition circuit, an overcurrent judgment circuit, a pulse isolation transformer, a pulse signal latch circuit, and an overcurrent protection execution circuit. circuit. By collecting the bus current, the collected signal is input into the overcurrent judgment circuit, and the overcurrent judgment circuit outputs a pulse signal, which is transmitted to the secondary latch circuit through the pulse transformer, and the latch circuit converts the pulse signal into a set level signal before transmission To the over-current protection executive circuit, so as to close the field effect transistor of the bus switch and realize the over-current protection. After the overcurrent fault is removed, the external protection restores the signal, restores the latch circuit to the initial state, and restarts the bus switch FET. This circuit is suitable for the protection of aerospace high-voltage busbars with magnetic isolation requirements, and can realize overcurrent protection and protection recovery functions.

Description

technical field [0001] The invention belongs to the field of power supply reliability of an aerospace vehicle power supply system, and in particular relates to a high-speed response overcurrent protection circuit of a magnetically isolated high-voltage bus bar. Background technique [0002] At present, large spacecraft such as space stations and high-orbit satellites generally adopt a 100V high-voltage bus power supply system. Under this system, it is generally required that each electronic product and power distribution equipment have a magnetic isolation design to improve the reliability of the spacecraft. At present, the bus overcurrent protection usually adopts fuses, relays and other methods for overcurrent protection. Fuses have the characteristics of fast response and simple design, but the fusing current of high-reliability aerospace fuses is not greater than 15A, which cannot meet the requirements of some high-power electronic products. The requirement of large fus...

AI Technical Summary

Problems solved by technology

Fuses have the characteristics of fast response and simple design, but the fusing current of high-reliability aerospace fuses is not greater than 15A, which cannot meet the requirements of some high-power electronic products. The requirement of large fusing current is not conducive to the overall optimal design

Relay protection realizes the isolation between the control circuit and the busbar, but due to its own mechanical characteristics, its action time is long and the response speed is slow, so it cannot achieve high-speed response

Images