过零检测器可以通过预报功率谱形状的变化来发现环境噪声中新出现的运动声源，研究了过零检测器的检测性能。
Zero-crossing detector is capable of predicting the shape changes of power spectrum so as to find the newly emerged moving sound sources in ambient noise.
另外，设计了启动保护电路和过压保护电路，保护电路进一步提高了功率器件IGBT工作的稳定性，从而增强了处理故障的能力。
In addition, startup protection circuit and overvoltage protection circuit is also designed, which raise stability of power device IGBT further, thus strengthen the ability to deal with trouble.
必须为各型安装功率为满负荷安培的过流保护加热丝的运动发生器，提供类似电磁启动器之类的保护。
Protection must be provided, such as a magnetic starter, for all types of motion generators with over-current protection heaters sized to the full load amps.
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