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基于输入28.5 VDC,输出总功率180 W的机载计算机电源的设计,为满足“GJB181飞机供电特性”中对飞机用电设备输入28.5 VDC时过压浪涌80 V/50ms的要求,采用检测输入电压并控制MOSFET导通和关断的方法,通过对该电路的理论数据分析及与实际测试数据做比较,模拟了80 V/50 ms过压浪涌的试验,并用示波器记录了测试波形,得出该设计电路在输入28.5 VDC时,可以完全满足GJB181飞机供电特性过压浪涌要求的结论。并通过扩展应用介绍了在其他输入电压类型时过压浪涌保护电路的设计。
Based on an input of 28.5 VDC and an output power of 180 W, the on-board computer power supply is designed to meet the requirement of 80 V / 50 ms for overvoltage surges at the input of 28.5 VDC to the electrical equipment of the aircraft in “GJB181 Aircraft Power Characteristics” The method of detecting the input voltage and controlling the on and off of the MOSFET is discussed. The theoretical analysis of the circuit and comparison with the actual test data show that the 80 V / 50 ms overvoltage surge test is simulated and the oscilloscope records the test waveform It concludes that the design circuit can completely meet the requirements of overvoltage surge of GJB181 aircraft power supply when it inputs 28.5 VDC. The application of overvoltage surge protection circuit in other types of input voltage is introduced by extending the application.