Surge current suppression circuit of spacecraft switch control path

Abstract

The invention discloses a surge current suppression circuit of a spacecraft switch control path. A parallel branch is formed by connecting a resistor and a relay contact in series, and two ends of the parallel branch are connected with two ends of a power switch K1 contact in parallel. The relay drive circuit is located at the front end of the power switch drive circuit, the positive end of the secondary bus is connected with the positive end of a coil of a relay switch K2 through a current-limiting resistor, and the negative end of the coil of the relay switch K2 is directly connected with a drive signal end. The power switch driving circuit adopts an MOS tube driving circuit to perform on-off control and adopts a triode delay circuit to perform delay control, the positive end of the secondary bus is connected with the s pole of an MOS tube, the d pole of the MOS tube is connected with the positive end of a coil of the power switch K1 through a current-limiting resistor of the power switch K1, and the negative end of the coil of the power switch K1 is directly connected with the negative end of the secondary bus. When the driving signal is a closing instruction, the relay contact is closed before the power switch contact; and when the driving signal is a turn-off instruction, the relay contact is disconnected before the power switch contact.

Description

technical field [0001] The invention relates to a surge current suppressing circuit for a switch control path of a spacecraft, in particular to a surge suppressing circuit when a conventional surge suppressing circuit is not working at the instant of a switch action, and belongs to the field of high-power power distribution. Background technique [0002] There are many equipment in the overall circuit sub-system of the space station, and most of the equipment switches are controlled by mechanical switches. Some devices have their own separate switch control, and some devices share a switch for control. Since the equipment is designed with EMI filter capacitors and parasitic capacitances in the path, and the primary bus return line of the equipment and the chassis are in a short-circuit state during the entire star stage, the inherent surge suppression circuit inside the equipment is blocked at the moment the mechanical switch is closed. The bypass does not work as it should...

AI Technical Summary

Problems solved by technology

[0003] In the spacecraft system, the surge current generated at the moment the mechanical switch is closed is extremely harmful: 1) It will affect the stability of the primary bus, and the bus voltage will drop instantaneously; 2) It may cause the contact failure of the power path switch to stick; 3) It may damage the equipment Fuse damage, etc.

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