机载传感器激磁电源的设计

Design of Sensor Electronic Model Used in FCC Test

阐述了采用数模混合技术完成交流激磁电源的设计方法,利用数字技术产生稳定正弦波信号,经低通滤波、功率放大生成具有一定驱动能力的交流信号,并对输出信号进行闭环控制,以达到稳幅的目的;主要描述了供电电路、交流功率驱动电路、闭环控制电路的设计方法;通过本设计方法,可以产生在宽温度范围、多负载情况下产生稳频稳幅的交流传感器激磁电源;并通过温度试验、带负载能力试验、输出短路试验验证了该交流激磁电源的频率稳定性和幅值稳定性,以及输出短路时的自保护能力。

This paper expatiate a kind of design method of AC excitation power supply based on mixed--signal technology, that uses digital IC to produce stable sine wave, by low--pass filters and power amplifier, which gains the AC signal driving capability. This method achieves stable sine--wave amplitude objective according to the output signal of the closed--loop control method. Design techniques of Supply circuit, AC power drive circuit and closed loop control circuit are introduced. Through this design method , stable frequency and amplitude＇ s sensor AC excitation power supply, that can work in a certain environment is produced. By tests in differenct load and working temperature, AC excitation power supply was verified the stability of frequency and amplitude with multiple loads in wide temp range and self--protection capability under output short--circuit.