机载控制保护盒必须时刻监测机载发电机交流电压的电压和频率,当电压或频率出现超差时,及时切断向机载设备的供电,保护设备避免事故发生。针对某型直升机控制保护盒采用模拟电路方式进行测量误差大的缺点,以AT89S52单片机为核心,设计了一款数字式机载控制保护盒。该保护盒在实现原控制保护盒所用功能上,增加了声音告警功能,延时时间补偿算法的应用,使得控制盒动作时间可精确到毫秒。实际应用结果表明,该保护盒具有测量准确、可靠性高、成本低、体积小等优点。%Airborne control-protect box must monitor the voltage and frequency of the airborne generator.When the voltage faults or the frequency faults take place,the box will cut off the power supply to the airborne equipment to avoid the accident happening.Aiming at the disadvantages of big measurement error when the control-protect box adopts analog circuit mode,based on the AT89S52 single-chip microcomputer a digital airborne control-protect box is designed.With all the functions of the original control-protect box,this protect box add a sound alarm function and delay-time compensation algorithm,so that the action time of the control box can be accurate to the millisecond.The results of practical application show that the protection box has the advantages of accurate measurement,high reliability,low cost,small volume and so on.
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