新加入的是直流路网中用斩波器和中间电路电压可调的功率变换装置。

Major innovation is the power conversion with chopper and controlled converter DC-link in direct current networks.

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给出了一种常用两级低电压CMOS运算放大器的输入级、中间增益级及输出级的原理电路图，并阐述其主要工作特性。

The principle figures of input stage middle gain stage and output stage for a usual two stage low-voltage CMOS operational amplifier and their principal performance are presented in the paper.

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根据供电电网电压及中间直流回路电压给定，对主电路的元件参数进行了选择和优化。

According to source voltage and middle DC voltage command, the parameters of the rectifier are chosen and optimized.

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