Development Of The Full-bridge Soft-switching DC/DC Converter Based On DSP

The development of economy, the expansion of the human.population of demand for energy unceasing increase. Is that energy is off-season also appeared power failures, so the new energy economy, cleaning is the favour of people. With fuel cell commercialized, fuel cell pressurization DC/DC converter performance directly affects conversion efficiency, so the study of high frequency change, efficient fuel cell pressurization DC/DC converter is of great significance. This paper, analyze and study the fuel cell system of fuel cell pressurization switch DC/DC converter topology and the control method, eventually making prototype.We chose a vice edge series, double CDD passive ground-clamp full bridge ZVZCS DC/DC converter topology structure, analyzes the principle and realization condition of soft switch, described the high-frequency transformer choice, output filter capacitor, filtering inductances, rectifier diode of components choice.Using TMS320LF2407A as main control chip design a fuel cell pressurization bridge ZVZCS DC/DC converter, digital control system adopted a novel based on DSP digital phase shifting the PWM pulse method using only one event management, that is not add any hardware. According to the bridge circuit, and designs the safety work flow pressure, had overheating protection etc fault detection circuit, perfect the converter function. This control strategy of converter PID control system, then software design process and the main program flow chart.Finally make a 5KW fuel cell pressurization bridge ZVZCS DC/DC converter experimental prototype, the experimental results show that the main circuit design is reasonable, the successful implementation ZVZCS, complete the required work security and stability.