利用四位双向移位寄存器等电子元件可制作能直观显示直流电流方向的模拟演示仪。
Four-bit bidirectional shift register was used to produce the device for demonstrating the direction of direct current.
主电路采用反向串联的双向IGBT开关，用可编程逻辑元件实现四步切换，以保证安全换流。
To guarantee safe commutation, a four stepped switching strategy is realized by using programmable logic devices.
主电路采用反向串联的双向IGBT开关，用可编程逻辑元件实现四步切换，以保证安全换流。
To guarantee safe commutation, a four stepped switching strategy is realized by using programmable logic devices.
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