中文说明： 第一次的晶闸管设备在 1956 年获释商业上。因为晶闸管可以用小型设备与控制相对较大的功率和电压量，他们发现广泛应用在电力、 从控制和电机速度控制到电力传动。 最初晶闸管仅依靠当前的逆转，把它们关闭，使其难以适用于直流电流 ；较新的设备类型可以打开和关闭控制闸门信号通过。晶闸管不是一个比例的设备像晶体管。它操作只完全上或完全关闭，使它不适合作为模拟放大器
English Description：
The first thyristor devices were released commercially in 1956. Because thyristors can control a relatively large amount of power and voltage with a small device, they find wide application in control of electric power, ranging from and electric motor speed control to power transmission. Originally thyristors relied only on current reversal to turn them off, making them difficult to apply for direct current; newer device types can be turned on and off through the control gate signal. A thyristor is not a proportional device like a transistor. It operates only fully on or fully off, making it unsuitable as an analog amplifier