车载移相全桥DC-DC变换器的设计与仿真

Design and Simulation of Vehicle Phase Shift Full Bridge DC-DC Converter

采用数字控制方式的移相全桥DC-DC变换器具有控制回路结构简单、抗干扰能力强等优点。以车载移相全桥DC-DC变换器为控制对象,在分析其拓扑结构并得到二阶数学模型的基础上,通过频域分析系统的稳定性,并设计数字PID控制器,构成闭环系统。采用Saber-Simulink联合仿真的方式指导参数调节,在兼顾仿真系统收敛性的基础上加快仿真速度,缩短PID参数的调整过程;在考虑车载电源对快速性、超调量的要求下,得到满足要求的控制器参数。通过样机试验验证了分析的正确性。

The phase-shifted full-bridge DC-DC converter adopting digital control has the advantages of simple control loop structure and strong anti-interference ability. The vehicle phase-shifted full-bridge DC-DC converter is used as the control object. Based on the analysis of its topology and the second-order mathematical model,the stability of the system is analyzed in the frequency domain,and the digital PID controller is designed to form a closed-loop system. The Saber-Simulink joint simulation method is used to guide the adjustment. On the basis of considering the convergence of the simulation system,the simulation speed is accelerated,and the adjustment process of the PID parameters is shortened. The vehicle power supply is required to meet the requirements of rapidity and overshoot. The controller parameters were verified and the correctness of the above analysis was verified by prototype experiments.