The paper presents a SPWM frequency variable and velocity variable system with SCR as main switching devices. The proposed scheme has been verified through experiment.
介绍一种以SCR作主开关器件的SPWM控制方式的变频调速系统，并通过实验对提出的方案进行了验证。
CPU is in an iron box together with other devices such as disk drives, a main memory and a switching power supply etc.
CPU同其它设备如磁盘驱动器、内存和开关稳压电源等被装在一个铁箱子中。
This paper studies and analyses mathematically the typical main circuits of the new generation of arc welding inverters using IGBT, MOSFET as power semiconductor switching devices.
对新一代弧焊逆变器各种典型的主电路进行了较深入的数学分析和研究。
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