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该机采用并联式脉宽调制开关电源,检修中发现该机开关电源损坏的情况时而有之,并具有一定的规律性,笔者根据实物元件绘制出电源原理图如图1所示,其工作原理、损坏特点以及检修中应注意的问题作一简单介绍。一、工作原理 1.电源的振荡过程:220V市电电压经D1—D4整流、C2滤波后产生的300V直流电压分两路输出:一路通过开关变压器T1①～②绕组加到开关管Q2(MTP6N)的集电极;另一路通过启动电阻R2加到
The machine uses a parallel pulse width modulation switching power supply, maintenance of the machine found in the case of switching power supply damage sometimes, and has a certain regularity, the author draws on the physical components of the power schematic shown in Figure 1, and its working principle , Damage characteristics and maintenance problems should be noted for a brief introduction. First, the working principle 1. Power oscillation process: 220V mains voltage by D1-D4 rectifier, C2 filter generated 300V DC voltage divided into two outputs: all the way through the switch transformer T1① ~ ② winding added to the switch Q2 (MTP6N) Of the collector; the other way through the start resistor R2 added