可控硅(亦称晶闸管)是大功率半导体器件,应用范围甚广,在交直流电机无线调速,交直流无触点开关,温度自动控制,整流和逆变等方面都被广泛应用。笔者在日常检查判断中,用下面这种方法对多台设备中的可控硅进行检查判断,效果良好,电路见附图。具体方法如下:将可控硅阳极和阴极回路加上正电压(即阳极A接电池E_C正极,阴极K接E_C负极,此时电珠不亮,说明该可控硅有正向阻断能力。把触发极G与可控硅阳被碰一下,电珠立即明亮。当触发极G移离阳极A,电珠继续发光,说明可控硅有导通能力。当在可控硅阳极A和阴极K之间加上正 Thyristor (also known as thyristor) is a high-power semiconductor devices, a wide range of applications, wireless speed regulation in AC and DC motors, AC-DC non-contact switch, automatic temperature control, rectifier and inverter are widely used. The author in the daily inspection judgment, using the following method of multiple devices in the SCR to determine the judge, the effect is good, the circuit see the attached map. The specific methods are as follows: the anode and cathode can plus a positive voltage SCR (anode A battery E_C positive, cathode K then E_C negative, then the battery does not light, indicating that the SCR has a positive blocking capacity Trigger G and touch the sun is touched, the bright immediately when the trigger G to move away from the anode A, the beads continue to light, indicating that the silicon has the ability to conduct when the silicon anode A and K between the cathode Plus positive