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介绍了一种 ATX微机用电源的工作原理 ,重点讲述了预备电源(5 VSB)的产生、睡眠状态与正常工作状态间的转换 ,以及脉宽调制器 TL494的控制原理。
A working principle of ATX microcomputer power supply is introduced. The generation of standby power supply (5 VSB), the transition between sleep state and normal working state, and the control principle of pulse width modulator TL494 are mainly described.