As shown in Figure 3-12, common - mode current (ICM) is caused by capacitive coupling (CCOUPLING) from the power line through the power transformer.

从图3 - 12可以看出，共模电流(ICM)是从电源线经过电源变压器通过电容耦合(CCOUPLING)而产生的。

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The main contents are made up of the following: common-mode transformer design, hardware design, FPGA function design, and the configuration and debugging of FPGA.

本文的主要内容有：共模变压器的设计，硬件电路的设计，FPGA功能设计，以及FPGA的配置和调试。

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