介绍了在三相四线制供电系统中，中线的作用，断线的危害，以及一种简单可靠的断线保护电路。
The paper introduced the effect of neutral wire the harm of open circuit and a kind of simple credible open circuit protection method.
文中对激光供电方案中所需的关键器件激光器（LD）、光电转换的工作特性做了详细的描述，对激光器的驱动电路、保护电路和温度控制电路做了深入的研究。
This paper describes the working characteristics of the key apparatus LD and optoelectric conversion, and deeply researches the drive circuit, protection circuit and temperature controlled circuit.
电源电路包括：射频信号发生电路、射频功率放大电路、直流供电电路和附加保护电路，以及与激光头的匹配网络。
The power circuit is composed of following circuits: RF oscillator, RF power amplifier, DC supply power circuit, protection circuit and matching network.
电源电路包括：射频信号发生电路、射频功率放大电路、直流供电电路和附加保护电路，以及与激光头的匹配网络。
The power circuit is composed of following circuits: RF oscillator, RF power amplifier, DC supply power circuit, protection circuit and matching network.
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