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有關PID控制應用在電源轉換器中,如何設定Duty的值
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請各位朋友幫忙一下:

學生目前在製作數位電源供應器中,首先面臨的是補償器設計的問題,需要諸位提供建議或經驗,問題如下:

pid中的設定大致跟microchip提供的範例差不多

kCoeffs[0] = Q15(0.156);
kCoeffs[1] = Q15(0.0);
kCoeffs[2] = Q15(0.0); PIDCoeffCalc(&kCoeffs[0], &fooPID);
fooPID.controlReference = Vref<<5;
...
ADCPC0bits.SWTRG0 = 1 ;
while(ADCPC0bits.PEND0);
fooPID.measuredOutput = ADCBUF0;
PID(&fooPID);
Vcom = fooPID.controlOutput + Vref;
PWM1_Duty = Vcom*3.543;
...

我們以這個控制方式撰寫時,會發生輸出不穩定與之前直接寫
P控制的結果不太一樣:
Vcom = Vref + Kp*(Vref - ADCBUF0)

學生想請問的是
上面程式中:Vcom = fooPID.controlOutput + Vref;
多加上Vref對嗎?




發表於: 2008/1/2 20:49
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