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樓主  發(fā)表于: 2011-07-05 11:37
圖片：
大伙看看。
xiakebiao
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1樓  發(fā)表于: 2011-07-05 15:13
這是一種用離散觸點(diǎn)輸出模擬電壓給變頻器的簡(jiǎn)易電路，圖中能控制兩臺變頻器，不是樓主所說(shuō)的INV1和INV2之間的電壓，INV1和INV2之間的電壓對控制毫無(wú)意義！具體實(shí)現方法是用PWM指令輸出可變占空比的脈沖，進(jìn)而可以調整電壓的高低。圖中理論上可以輸出0---12V的“階梯”電壓，再經(jīng)電容平滑濾波，但是速度響應會(huì )有一定的延遲（依電容大小而定）。此種電路一般應用在簡(jiǎn)易的控制中，優(yōu)點(diǎn)是省去了D/A轉換模塊，節約了成本。
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