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wangfuwang
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樓主  發(fā)表于: 2009-06-13 09:11
如圖一個(gè)電容降壓電路（付件），通電220V接入專(zhuān)業(yè)測試儀,測試靜態(tài)功率，測試儀電流表顯示0.055MM,而功率表顯示0.000W(測試儀電流表,功率表正常).真搞不明為何有電流,沒(méi)有功率,
請問(wèn)高手是不是沒(méi)有負載時(shí),電路上的降壓電容變成了功率因數補償了,而就變成了有電流沒(méi)功率.如果不是為何沒(méi)有功率,如又按顯示的電流計算有12W靜態(tài)功率,實(shí)際不可能有那么大,最多也不會(huì )超過(guò)0.5W，如按電流計算是12W的話(huà)，那么是不是補償了12W
描述：電路圖
附件： 圖.rar (37 K) 下載次數:18
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lixiang123
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1樓  發(fā)表于: 2009-06-13 12:23
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