main circuit meaning in English

线电路
主电路
主要电路
主要回路

Design of the main circuits of single - phase apfc converters
变换器主电路的设计
A kind of simple save main circuit for regulating voltage
一种简单节省的调压主电路
Main circuit control circuit power separation
主回路控制回路电源分离
Design of the main circuit of statcom equipment
装置主电路的设计
Mechanism analysis of voltage surge on igbt in bridge inverter main circuit
电压浪涌产生的机理分析

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