A Pulse-width Modulation Based DC-DC Converter for Electric Propulsion

A DC-DC converter is designed according to the request of the electric propulsion system for a fuel cell sightseeing car. The converter adopts a simple topography - full bridge circuit. The main switch transistors are driven by the module TL494, based on pulse-width modulation method. A high accuracy linear optical coupler is used to isolate analogy signal in order to guarantee the stabilization of the converter. Experiments show that the converter can satisfy the requirements of the power match between the fuel cell and the motor under the ordinary operation conditions.