A highly reliable output isolation control circuit for main backup power supply

Abstract

Disclosed is a high-reliability output isolation control circuit for a main power supply and a backup power supply. The high-reliability output isolation control circuit comprises a module power supply main part and a module power supply backup part which are connected in parallel, wherein the output ends of the module power supply main part and the module power supply backup part are in cascading connection with isolation units with the totally same circuit structure respectively; and the isolation units are isolated by adopting a field effect transistor, the driving voltage is generated by an auxiliary winding of an output difference module inductor, and the switch-on and switch-off of the isolation units are controlled by the isolation control circuit. The isolation circuit is isolated by the field effect transistor, so that the high-reliability output isolation control circuit is applicable to high-current output occasions, isolation loss can be effectively lowered, and thermal design difficulty is lowered; meanwhile, the field effect transistor is in a low-resistance characteristic in a switch-on state, so that relatively good dynamic characteristic is achieved; a thermal backup redundant way is realized, an output voltage drop value in main part and backup part switching is reduced, and safety of load power utilization is ensured; and in addition, fault isolation between the module power supply main part and the module power supply backup part is realized, so that the overall power utilization reliability is improved.

Description

technical field [0001] The invention belongs to the general technical field of aerospace, and relates to a highly reliable output isolation control circuit required by aerospace electronic products, and the method can also be widely applied to ground electronic equipment. Background technique [0002] A spacecraft is a huge system composed of many different functional units. All functional units need a power supply to work. For the power supply, these functional units are loads with different power and power requirements, and must be designed with high reliability and high Only a power supply with strong performance and adaptability can ensure the reliable and safe operation of the spacecraft within the design life, and even extend the service life of the spacecraft. [0003] In order to solve the reliability problem of the module power supply, there are many methods to ensure the first-level derating of device voltage and current stress, use some key components in parallel,...

AI Technical Summary

Problems solved by technology

The traditional isolation circuit is generally implemented by diodes, but this method will lead to increased losses and lower system efficiency in high-current applications, and the drop in output voltage during the master-standby switchover process is large, reducing the Ensuring the safety of the load

[0006] After retrieving relevant domestic and foreign literature, there is no isolation circuit for the main part and backup output of the module power supply of the present invention

Images