电能最基本的形态为：DC、AC

四大基本状态转换：

DC→AC、DC→DC、AC→DC、AC→AC

• 电力电子器件只是工作在两种状态

开通、关断

开通：即工作在高度饱和导通状态

如何利用电力电子器件的开通和关断两种状态实现电能四大基本状态之间的转换就是电力电子学所要研究的核心内容-The most basic form of power: DC, AC

Four basic state transitions:

DC → AC, DC → DC, AC → DC, AC → AC

•　power electronic devices just work in two states

Opened, shut-off

Opened: that operates in highly saturated conduction state

How to use power electronic devices on and off two states achieve energy transitions between the four basic power electronics is the core content to be studied