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一、电源电路部分 1.电源电路的工作过程,原理图如图1所示。交流市电由C_(801)、C_(802)、C_(803)、C_(804)和T_(801)组成滤波电路,用来防止交流线路或进入交流线路的干扰噪声。然后经过D_(803)、C_(805)进行整流滤波后产生140V直流电压送入开关稳压变换电路。140V直流电压经过R_(813)和R_(807)降压后加到IC_(803)的②脚,使IC_(803)内部的Q_1晶体管导通,故称为启动电路。Q_1导通后,电流经D_(803)正端,T_(802)的⑥脚、③脚、IC_(803)③脚④脚、R_(810)回到D_(803)负端。这时在T_(802)②脚产生一个感应电流加到
First, the power circuit part 1. Power circuit work process, the schematic shown in Figure 1. AC mains consists of C_ (801), C_ (802), C_ (803), C_ (804) and T_ (801) filter circuit to prevent the AC line or into the AC line interference noise. Then after D_ (803), C_ (805) rectified and filtered to produce 140V DC voltage into the switching regulator circuit. 140V DC voltage is added to IC_ (803) ② pin after R_ (813) and R_ (807) step-down to make Q_1 transistor in IC_ (803) turn on, so it is called as start-up circuit. After Q_1 is turned on, the current flows to the negative terminal of D_ (803) through the positive terminal of D_ (803), pin ⑥, pin ③, pin IC_ (803) ③ pin ④ of R_ (802). At this time in the T_ (802) ② feet produce an induction current added