介绍了绝缘门极双极性晶体管（IGBT）的基本结构、工作原理、开关特性，以及在焊接逆变器中的应用。
The paper introduces the basic structure, working principle and switching feature of IGBT and its application to the converter used for welding.
基于PIN二极管开关电路在射频信号切换方面的特性，设计了一种应用于滤波器切换的PIN电子开关电路。
Based on characteristics of PIN diode switch circuit in rf signal switching, a PIN electronic switch circuit is designed to perform filter switching.
本文讨论了复合开关晶体管的基本特性和开关特性，提供了实测数据和应用电路实例。
Both the fundamental properties and switching properties of compound switching transistor are discussed. The experimental test data and the practical examples of the application circuit are provided.
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