Power supply system for spaceborne camera based on transformer

Abstract

The invention provides a spaceborne camera power supply system based on a transformer, relates to a spaceborne camera power supply system and solves the problems that in existing spaceborne camera equipment, return wires of a primary power source and a secondary power source of a DC / DC module are not isolated from each other, so that an input stage and an output stage of the DC / DC module interfere with each other, and damage is prone to being caused to a backward stage. The small power DC / DC module is adopted separately to supply power to magnetic latching relay coils, and correctness of status switching of the power supply system is guaranteed; the DC / DC module is adopted to have access to a supply circuit directly, and by controlling an enable pin of the DC / DC module to stop outputting, it is avoided that after the system is powered on, through the access of the DC / DC module, the surge of the supply circuit occurs; by the adoption of the combination of the transformer,an audion and an RC charge and discharge circuit, isolation control is conducted to the working enable pin of the DC / DC module; according to the principle of the minimum reflux area, the common ground inside the power supply system is limited; by the adoption of the combination of two single output positive pressure DC / DC modules, a positive-negative dual output DC / DC module of stable output is formed.

Description

technical field [0001] The invention relates to a power supply system for a spaceborne camera, in particular to a power supply system for a spaceborne camera based on a transformer. Background technique [0002] In order to ensure the reliable operation of the relay switch, the operating voltage deviation of the magnetic latching relay coil is required to be no more than 10%. Simultaneous startup of devices on multiple satellites may cause large fluctuations in the power supply, exceeding the normal operating range of the magnetic latching relay, affecting the life of the relay or causing Relays cannot switch reliably. It is usually necessary to control the output state of the DC / DC module, the reference ground of the control signal is the primary power ground, and the reference ground of the control signal is usually the secondary power ground; the current transmission ratio of the optocoupler device that can achieve isolation control is limited Factors such as temperature...

AI Technical Summary

Problems solved by technology

[0003] The present invention solves the problem that the primary power supply of the DC / DC module and the return line of the secondary power supply in the existing space-borne camera equipment are not isolated, causing the input and output stages of the DC / DC module to interfere with each other, which is easy to cause damage to the subsequent stage; and the existing The maximum positive and negative power output of the dual output DC / CDC module is the same, which cannot meet the application requirements of most dual power supplies, where the positive power supply is large and the negative power supply power is small; for different loads on the star, the secondary power supply return line is required for equipotential connection, etc., provided A Transformer-Based Spaceborne Camera Power Supply System

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