推导了MCT关断电流的简单计算公式；
Simple calculation formula of MCT turning off current is derived.
这引出了新的问题：最初施加电功率时出现了大的浪涌关断电流。
This gives rise to a new problem: the occurrence of a large inrush off-current upon the first application of electrical power.
减小主开关管关断损耗采用了零电流关断电路。
ZCS circuit is adopted to reduce the loss of the main switch when switch off.
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