本文介绍了以电流控制型脉宽调制芯片uc 3842构成的开关电源的原理，分析了其保护电路的缺陷，并提出了一种改进的思路。
The paper introduces the principle of switch power which is composed by current control type PMW UC3842 and analyzes the shortage of protective circuit and proposes an improving idea.
主要介绍一种大功率超声波逆变电源装置的主电路、控制电路、驱动与保护电路的设计，并给出实验结果。
This paper introduces the design of high power supersonic inverting power supply, including main circuit, controlling circuit, driving and protecting circuits, and gives experimental results.
介绍一种实用的三相电源保护电路模块。
An useful protection module of three-phase power was introduced in this paper.
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