fundamental circuit meaning in Chinese

基本电路
基本回路

By means of fundamental circuit of the topologic graph , the equation of fundamental circuit was established and a motion analysis was carried out on the gear train
通过拓扑图中基本回路建立基本回路方程，对轮系进行运动分析。
This paper makes a detailed analysis as to the fundamental circuits and fundamental principles of boost dc - dc converter , spwm inverter and ac voltage adjustment circuit in the power supply . at the same time , the paper introduces the choice of the parameters and the design of control
本文分别对逆变电源中的boost升压斩波电路、 spwm逆变电路以及斩控式交流调压电路从基本拓扑结构和工作原理上进行了详尽阐述，同时介绍了各功能模块的参数选取和控制设计。