开关电源的数字控制技术研究

传统的PWM型开关电源是模拟控制方式,其控制精度、响应速度等都由电路拓扑和器件本身的参数决定,很难进一步提升其性能。文中采用数字控制方式,克服了模拟信号容易出现的失真、畸变等弊病,使设计更灵活,便于修改,并支持很多复杂的算法,可以大范围提升开关电源的性能。同时,通过比较目前流行的开关电源数字控制方法与传统的模拟控制方法,提出了采用数字控制技术需要解决的难点和数字控制电路的设计原则,最后给出了各种数字控制方法的优势和局限性。

Study on Digital Control Technology of Switching Mode Power Supply

The control method of traditional Pulse Width Modulation （PWM） Switching Mode Power Supply （SMPS） is controlled simulatedly. It＇s control precision and response speed are decided by the circuitry topology and the parameter of the device. Therefore, it is difficult to improve the performance effect. With the digital control method, we can overcome the distortion and aberration caused by the simulated signal, we can design and modify more flexibly, and improve the SMPS performance greatly by using many more com- plex arithmetic. This paper introduces several modem digital control modes for SMPS, compares these modes with the traditional analog control modes, and discusses difficulties in digital control and design principles of the digital control circuit. Finally, we give the predominance and restrictions of these digital control methods.