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关于Phase-Shifted Full-Bridge的疑问

Other Parts Discussed in Thread: UC3875

以上是Vishay的全桥移相原理分析文档中的一页

对t1到t2阶段,文档中的分析是:

对这段分析有如下疑问:

“This action will start to charge the COSS of QD and discharge the COSS of QC as shown in Figure 4.

After the voltage of drain of QD, or source of QC, reaches zero

请问从放电的结果为什么drain of QD, or source of QC会是0呢