双向元件是必须有两只反极性且并联而成的电子元件.主要是普通晶闸管. 普通晶闸管(VS)实质上属于直流控制器件。要控制交流负载,必须将两只晶闸管反极性并联,让每只SCR控制一个半波,为此需两套独立的触发电路,使用不够方便。 双向晶闸管是在普通晶闸管的基础上发展而成的,它不仅能代替两只反极性并联的晶闸管,而且仅需一个触发电路,是目前比较理想的交流开关器件。其英文名称TRIAC即三端双向交流开关之意
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.
一个气缸的双向运动代替两个执行元件的直线运动使其经济合理结构紧凑;
The straight line motion of two actuators was substituted by two directive motion of one pneumatic cylinder, which made the machine more economic and more compact.
板材夹具和加热炉采用自动和手动双向调节系统和埋入式陶瓷远红外辐射元件,提高热吸塑效果。
Both clamping devices and heating furnace has been adopted automatic and manual bi-directional regulating system and the embedded ceramic infrared parts to enhance the thermoforming effect.
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