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将８９Ｃ５１单片微机应用于电力系统功率因数自动控制，设计中利用了差动式相敏放大器检测电路和充分合理地使用了８９Ｃ５１单片机片内ＲＡＭ，使电路结构简单，抗干扰性强
The 89C51 single-chip microcomputer used in the power system power factor automatic control, the design uses the differential phase-sensitive amplifier detection circuit and the full and reasonable use of the 89C51 microcontroller RAM, the circuit structure is simple, strong anti-interference