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微机稳压电源大部分采用“半桥式”脉宽调制型开关稳压电路,它的控制电路通常由专用的脉宽调制集成组件构成,典型的如TL494、IR3M02、SG5G24等。根据电路的不同设计,控制电路的工作电源(Vcc)的供电方式有两种:一是采用专用的辅助电源,此种电路结构明了,检修较方便;另一种是省去辅助电源,Vcc由主变换变压器次级经高频整流、滤波后产生,这种电路示意图如图1。
Most of the microcomputer power supply using “half-bridge” pulse-width modulation switching regulator circuit, the control circuit is usually composed of dedicated pulse width modulation integrated components, such as TL494, IR3M02, SG5G24 and so on. According to the different circuit design, the control circuit power supply (Vcc) power supply in two ways: First, the use of a dedicated auxiliary power supply, the circuit structure is clear, overhaul more convenient; the other is to save the auxiliary power supply, Vcc by Transformer secondary transformer secondary high-frequency rectifier, generated after filtering, this circuit diagram shown in Figure 1.