This paper introduces the system of single phase large power source varied frequency for heating, contains rectifier, filter, inverter and control circuit etc.

介绍了大功率单相变频加热电源的系统组成，包括整流、滤波、逆变和控制电路等部分。

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A method for measuring the dynamic frequency characteristics of a system with 8031 single chip microcomputer was presented, the circuit diagram was given and the software designing was introduced.

提出了用8031单片机及相应接口电路来完成系统动态频率特性测试的方法，给出了硬件的电路原理图，介绍了软件设计。

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A generalized equivalent circuit model was developed for both single-tuned and double-tuned radio-frequency(RF) coils for Magnetic Resonance Imaging (MRI) systems.

为了解决磁共振成像系统中双调谐射频线圈的设计问题，提出了一个通用等效电路模型。

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