【摘要】 为进一步提高移相全桥ZVS PWM变换器的动态性能,提出一种模糊PID预测控制策略。该文利用移相全桥ZVSPWM变换器源于BUCK变换器的事实,建立了移相全桥变换器的小信号模型。在变换器小信号模型的基础上提出模糊PID预测控制策略,采用MATLAB软件进行了控制策略的仿真验证。仿真结果表明,模糊PID预测控制策略极大地改善了控制系统的动态性能。这种控制策略具有控制算法简单和控制过程易于实现的优点,不失为一种实用的数字控制方法。更多还原

【Abstract】 The fuzzy PID and predictive digital control strategy is presented to improve transient respondence of phase-shifted full-bridge converters.The principles of phase-shifted full-bridge converter are analyzed.The small-signal model in main circuit is built by using average circuit model.By using MATLAB tools,digital simulations are performed and simulation results are given.Simulation results show that a very good transient respondence is obtained using the fuzzy PID predictive control strategy.The control arithmetic is simple and wieldy.So the strategy is a simple and practical digital control method.更多还原