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請問使用4011做最大功率追蹤問題??
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新會員
 
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目前小弟用4011的A/D及馬達PWM做擾動觀察法的增減載控制,
void Show_ADC(void) { unsigned int V ; unsigned int I ; unsigned int P ; IFS0bits.ADIF = 0; ADCON1bits.ASAM = 1; while(!IFS0bits.ADIF); ADCON1bits.ASAM = 0; V = (ReadADC10(0)>>6) ; // VR2 I = (ReadADC10(1)>>6) ; // VR1 { P=V*I; Ps=Vs*Is; if (P >= Ps) { if (V < Vs) PDC1 = PDC1 - 0x0001; //增減載控制 else PDC1 = PDC1 + 0x0001; } else { if (V > Vs) PDC1 = PDC1 - 0x0001; else PDC1 = PDC1 + 0x0001; } Vs=V; Is=I; } } 以上判斷增減載程式, 電壓與電流控制是使用模擬板上的VR1以及VR2, 在單步執行時都可以往正確的方向增減載, 一開始的dutycycle = 0x07FF以及period = 0x07FF; 但是直接run時波寬會一直變小直到歸0, 觀察PDC1暫存器,內容值會一直往上數,也超過PTPER的值, 想請問各位,雖然說已經有做了中斷旗標會不會是因為A/D取樣方面速度還是太快導致還沒讀取A/D值就做增減載判斷呢?? 以至於增減載判斷錯誤呢?? 還是小弟的程式上還有些問題呢?? 還請各位幫小弟解惑一番...謝謝
發表於: 2008/9/23 12:04
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