The control scheme and operating principle of a double closed-loop AC/DC power converter system are discussed by using physics.

从物理角度讨论了双闭环交/直流功率变换器系统的控制方案和工作原理。

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So the third chapter focuses on the measuring system. The operating principle (Light extinction method), the factors which influence the result and the resolvent to avoid them are explained.

第三章对此磁致偏振特性测量系统的搭建及工作原理（消光法）、影响测量结果的因素及解决方法、实验操作步骤等作了说明。

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The paper introduced the operating principle of the temperature measurement system based on USB interface, and described the hardware structures and software design of this system in detail.

文中介绍了基于USB接口的温度检测系统的工作原理，详细叙述了该系统的硬件结构和软件设计。

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