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本文所述AT386微机开关电源是目前PC机中较常见的微机电源,此类电源由于生产厂家不同,电路不尽一致。笔者以MPU-200P型的实物绘成整机电路图如图1所示,说明它的工作原理和常见故障的检修方法,该电源的四组稳定电压输出为+5V(20A)、-5V(0.5A)、+12V(8A)、-12V(0.5A),整机容量不小于200W。电路以Q_1、Q_2(2SC2555)作为功率开关管组成主变换电路。220V交流市电经保险丝、热敏电阻和LC低通滤波器后直接进行桥式整流,使C_5、C_6滤波电容
This article describes the AT386 microcomputer switching power supply is the PC more common computer power, such power supply due to different manufacturers, the circuit is not consistent. The author of MPU-200P-type physical circuit diagram as shown in Figure 1, indicating its working principle and common troubleshooting methods, the power supply of the four sets of stable voltage output of +5 V (20A), -5 V (0.5 A), + 12V (8A), - 12V (0.5A), the whole capacity of not less than 200W. Circuit to Q_1, Q_2 (2SC2555) as the main switch power switch circuit. 220V AC power directly through the fuse, thermistor and LC low-pass filter bridge rectifier, the C_5, C_6 filter capacitor