A satellite load power supply undervoltage protection control circuit

Abstract

A satellite payload power supply undervoltage protection control circuit includes an undervoltage detection circuit, an undervoltage action circuit, an input switch circuit, an on / off instruction circuit, and a power input switch MOS tube M1. The undervoltage detection circuit detects the bus voltage, the undervoltage action circuit outputs a pulse signal according to the detection situation of the undervoltage detection circuit, the switch machine command circuit performs logic or operation according to the shutdown command and the pulse signal output by the undervoltage action circuit, and controls the input The switch circuit and the power input switch the MOS transistor M1 to control whether the input of the load power supply is turned on. The circuit of the present invention uses few devices and is small in size, and at the same time combines with the power-on and power-off commands, which simplifies the difficulty of the interface. In the state of power-on or power-off, its own power consumption is very small and will not affect the primary bus voltage of the satellite. The circuit of the invention can meet the requirements of 28V, 42V and 100V satellite primary buses, and can be applied to satellites and spaceships such as deep space exploration and manned moon landing.

Description

technical field [0001] The invention belongs to the field of spacecraft power supply and distribution, and relates to an undervoltage protection control circuit applied to spacecraft power supply products. Background technique [0002] The secondary power supply on the satellite supplies power to the platform and the payload respectively. A distinction is made between a secondary power source that powers the platform and a secondary power source that powers the load. The secondary power supply for the platform focuses on ensuring the safety of the power supply for the entire star platform, and there is no undervoltage protection function on the primary bus input side. The secondary power supply for the load requires that when the primary bus voltage of the satellite drops to a certain value, the secondary power supply is turned off, and the load equipment stops working to save energy and ensure the normal operation of the satellite platform; at the same time, the secondary ...

AI Technical Summary

Problems solved by technology

When the energy provided by the solar cell array is roughly equivalent to the energy required by the satellite load, the load will be turned on and off frequently, so the existing working method of this undervoltage protection circuit is not suitable for the satellite load power supply

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