本文以Buck（降壓型）DC-DC變換器為例，提出了對數(shù)字PWM的PID控制器的兩種修正方式：死區(qū)控制方式，平均數(shù)字濾波控制方式。數(shù)字控制器根據(jù)輸出電壓誤差決定是否用該修正方式計算下一個占空比。對系統(tǒng)的測試說明經(jīng)過修正的PID控制buck型
DC-DC變換器可以同時得到穩(wěn)定精確的穩(wěn)態(tài)響應(yīng)和快速的瞬態(tài)響應(yīng)。
關(guān)鍵詞：數(shù)字PID控制， 死區(qū)控制， 平均數(shù)字濾波
【Abstract】With a design example based on a buck DC-DC converter presented, the paper
gives out two modifications to the digital PID controller for PWM: a dead zone and an averaging digital filter. The digital controller monitors the output voltage error to determine if a modification should be employed to calculate the next duty cycle. Experimental result from the system indicates that a stable and accurate steady-state response can be obtained while maintaining a good and quick transient response.
Keywords: digital PID controller, a dead zone, an averaging digital filter