After the analysis of bus-route passenger characteristic and decision of typical city, different bus-route standards of different bus-route ranks are put forward.

分析了典型城市公交线路客流特征和居民公交出行决策特征，基于常规公交线路等级划分的思想，研究了不同等级公交线路的配置标准。

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In the paper, the switch characteristic and protection principles of IGBT are described. Several typical protection circuits are analyzed. A new soft switch technology is put forward.

主要介绍了功率器件IGBT的开关特性和保护原理，分析了几种典型的保护措施，并提出了一种新型软开关技术。

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