Study on a High-Efficiency DC/DC Converter for a Class of Space Fuel Cell Driving Power

Aiming at the application requirements of energy management strategies for a type of space fuel cell system, a BUCK circuit, combined with quasi-resonant soft switching methods, current zero-crossing and peak current detection, front-end current detection and other technologies, through improved design and optimization of control methods, to achieve high efficiency driving power available in the aerospace field. A special soft-switching technology is realized, and the input switch tube is turned off and turned on in a single cycle at the peak point and zero-crossing point of the inductor current to reduce the switching loss. Simulate the drive power supply through PSIM to optimize the design of parameters such as operating frequency range and zero-crossing detection. Finally, the principle prototype was developed to verify the control technology. The results of simulation and the principle prototype show the feasibility and high conversion efficiency of the control method.