通过二、三值逻辑开关函数间的转换，系统地描述了三相CSR三值逻辑PWM信号发生中的状态切换；
A systematic description of the state switching in trilogic PWM signal generation of three-phase CSR by using the conversion between bilogic and trilogic switching functions.
两种模式的切换是通过模式转换开关实现的。
Conversion of the two modes is achieved through the mode switch.
分析了静态转换开关（STS）的无环流切换控制的工作原理。
The control theory for static transfer switch(STS) without circulation current is elaborated.
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