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CASPER GM—1489/D是家用电脑常用的一种单色显示器,它的开关电源部分如图1所示。从电路形式来看,这是典型的并联自激式开关电源。220V交流电经整流、滤波之后,在电容C_(105)、C_(106)上获得+300V含有纹波的直流电压。这一电压经开关变压器T_(101)绕组L_1和电阻R_(105)加到开关三极管Q_(101)的c、e之间,还通过电阻R_(102)、R_(104)向Q_(101)基极注入启动电流。T_(101)的绕组L_1和L_2的同名端如图1所示,所
CASPER GM-1489 / D is a monochrome display commonly used in home computers, its switching power supply section shown in Figure 1. From the circuit form point of view, this is a typical parallel self-excited switching power supply. 220V AC after rectification, filtering, the capacitor C_ (105), C_ (106) to obtain a +300 V DC voltage ripple. This voltage is added to the c, e of the switching transistor Q_ (101) via the winding L_1 and the resistor R_ (105) of the switching transformer T_ (101) and also to the Q_ (101) through the resistors R_ (102) and R_ (104) Base injection start current. T_ (101) of the winding L_1 and L_2 of the same name as shown in Figure 1,