【摘要】 针对DC/DC变换器这种非线性系统,提出了一种基于模糊PID的数字控制方法。该方法通过对输出电压的偏差及偏差变化率的识别,进行模糊推理,实现对PID控制器参数的在线调节。电流连续模式和断续模式下的Buck变换器仿真结果表明,该方法能有效减小系统的超调量,提高系统的响应速度,缩短系统的调节时间,增强控制系统的动态性能。更多还原

【Abstract】 For the nonlinear patterns of DC/DC converters,a digitally controlled method based on fuzzy PID control is presented.On-line tuning of the parameters of the PID controller is attained by measuring the error and error change in output voltage and fuzzy-reasoning.Simulation results of a Buck converter operating in continuous conduction mode(CCM) and discontinuous conduction mode(DCM) show that the overshoot of the control system is can effectively reduced,accelerating the response speed,reducing the adjustment time,thus enhancing the dynamic performance of the control systems.更多还原