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介绍了几种用于光纤陀螺光源的高精度温度控制的脉宽调制(PWM)工作方式,并分析了这几种工作方式的驱动转换过程。对于脉宽调制方式引入的电磁干扰问题,详细分析了转换交越过程中的输出信号及频谱。研究发现,在脉宽调制工作的交越过程中,输出信号的频率和脉宽是复杂的、无规律的,其谱线位置发生了随机的、不可预测的变化,功率分布不再符合周期矩形脉冲谱特性。针对这种交越随机频谱引入的电磁干扰,提出了几种有效的解决方案,并给出了一种方案的实验验证。
Several pulse width modulation (PWM) operating modes for high precision temperature control of fiber optic gyroscopes are introduced, and the driving conversion processes of these working modes are analyzed. For the problem of electromagnetic interference introduced by the pulse width modulation method, the output signal and the frequency spectrum in the transition process are analyzed in detail. It is found that the frequency and pulse width of the output signal are complex and irregular during the crossover of pulse width modulation. The random and unpredictable changes occur in the spectral positions of the pulse, and the power distribution no longer accords with the periodic rectangle Pulse spectrum characteristics. Aiming at the electromagnetic interference introduced by this crossover random spectrum, several effective solutions are proposed, and a scheme of experimental verification is given.