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该机采用脉宽调制(PWM)开关电源.输入工作电压范围为AC 110～220 V/50 Hz,输出的稳定直流电压有:5 V、C 5 V、C 11 V、-28 V、VACI、VAC2。市电经抗干扰环形滤波器滤除进线的高频干扰,再经桥式整流电路产生300 V左右的直流电压,一路加到开关变压器T502①、②和开关管V501上,另一路经R501对C506充电,当C506的充电电压上升到≥16 V时,送到脉宽调制器N501⑦,从NS01⑥输出电压,使V501导通,T502①为正、②为负。次级⑤为正、④为负,经VD505、R517的正反馈,使V501
The machine adopts pulse width modulation (PWM) switching power supply. The input working voltage range is AC 110 ~ 220 V / 50 Hz, the output stable DC voltage: 5 V, C 5 V, C 11 V, -28 V, VACI, VAC2. Mains filter by the anti-jamming ring filter into the line of high-frequency interference, and then by the bridge rectifier circuit to produce about 300 V DC voltage, all the way to the switching transformer T502 ①, ② and switch V501 on the other through R501 C506, when C506’s charging voltage rises to ≥16 V, it will be sent to N501 ⑦ of pulse width modulator and output voltage from NS01 ⑥ to make V501 turn on, T502① is positive and ② is negative. Secondary ⑤ is positive, ④ is negative, by VD505, R517 positive feedback, so V501