Research on High Reliable Aerospace Secondary Power Supply Based on Resonant Reset Forward Converter

Abstract

Compared with the ground secondary power supply, the aerospace secondary power supply puts forward higher requirements for reliability and safety. This research works to promote the safety and reliability requirements based on resonant reset forward converter. Firstly, the working process of resonant reset forward converter considering parasitic parameters was analyzed, the working mode and waveform were given in detail. Secondly, the parameters of resonant capacitor and excitation inductance were analyzed, which ensure reliable reset for excitation current of the transformer and the voltage spike, which satisfied the derating requirements of MOSFET. Thirdly, the selection and heat consumption of resonant reset capacitor were conducted, and an effective solution was proposed. Finally, a low-power power supply prototype was developed for further experimental analysis. Then the waves of key components were measured. The experiment results showed that reasonable parameters for the selection of resonant reset capacitor can ensure the effective reset of the excitation inductance for the transformer, reduce the peak of MOSFET, improve the EMI, reduce the voltage and thermal stress of the resonant capacitor which improve the reliability of the secondary power supply for aerospace. The converter technology based on resonant reset forward can satisfy the application requirements of high reliability and miniaturization of the aerospace secondary power supply, and will promote the technical accumulation and progress of aerospace power supply.