Fault isolation electronic switch applicable to direct current power supply system of spacecraft

Abstract

The invention discloses a fault isolation electronic switch applicable to a direct current power supply system of a spacecraft, comprising a power MOS (Metal Oxide Semiconductor) tube M1 for power transmission control, a resistor R0 for current detection, a continuous current diode D1 for providing a continuous current circuit, a power driving circuit with slow power-on and power-off functions for inhibiting surge current and peak voltage, a delay tripping circuit for realizing an inverse time limit protection function of a circuit and an isolation control circuit for transferring state and control information. The output of the power driving circuit with slow power-on and power-off functions enters into logic control, and the power-on / power-off of the power MOS tube M1 is controlled, so that a solid power electronic switch is controlled; the output of the delay tripping circuit enters into logic control to generate a driving signal, and the power-on / power-off of the power MOS tube M1is controlled, so that immediate inverse time limit protection is realized; and an input / output signal of the isolation control circuit is electrically isolated from a power circuit. A slow power-on and power-off technology is adopted in the power driving circuit provided by the invention, thus, the surge current and the peak voltage caused by a capacitive load and an inductive load can be effectively inhibited, the loading capacity of the electronic switch can be improved, and safe, stable and reliable work of equipment can be guaranteed.

Description

technical field [0001] The invention relates to a fault isolating electronic switch, in particular to a fault isolating electronic switch suitable for a spacecraft DC power supply system, and belongs to the field of electronic technology. Background technique [0002] With the rapid development of space technology, the power capacity of the spacecraft power supply system continues to increase. The 100V high-voltage primary busbar has been prepared or has been adopted in the period, which puts forward higher requirements for high reliability, long life and high power of the power distribution system. The traditional mechanical contact relay achieves on-off control by turning on and off the wire package to make the internal contacts contact or disconnect. Often, the contacts are stuck due to excessive contact current, so that the relay cannot be disconnected. In addition, the relay There are also disadvantages such as unreliable contact of the contacts, contact caused by defo...

AI Technical Summary

Problems solved by technology

However, this kind of switch control ground is not electrically isolated from the power ground, and large disturbances on the power line will affect the reliability of the control signal

Therefore, these products cannot be directly applied in the aerospace field

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