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六、日立NP820机芯彩电开关电源的原理与检修日立NP82C机芯彩电开关电源是另外一种结构独特的串联型自激式开关电源。与前面介绍的两种开关电源的主要区别是:开关管直接与300V直流电源相连;续流二极管直接接在开关变压器的储能绕组。采用上述电路结构的彩电开关电源还有日立NP84C、日立G7PN、日电μA两片机,环宇54C—2R等机芯彩电开关电源。在这些机芯开关电源中,尽管采用的厚膜电路各不相同,但电路工作原理大同小异。原
Six, Hitachi NP820 movement color TV switching power supply principle and overhaul Hitachi NP82C movement color TV switching power supply is another unique structure of the series self-excited switching power supply. The main difference between the two types of switching power supplies described above is that the switch tube is directly connected to the 300V DC power supply and the freewheeling diode is connected directly to the energy storage winding of the switch transformer. The use of the circuit structure of the color TV switching power supply there are Hitachi NP84C, Hitachi G7PN, Japan’s μA two-chip machines, Universal 54C-2R and other mobile phone color TV switching power supply. Switching power supply in these movements, despite the use of thick film circuits are different, but the circuit works more or less the same. original