How to detect the light-controlled thyristor?

Last Update Time: 2018-10-29 14:48:43

How to detect the light-controlled thyristor?

Whether it is two feet or three feet of the light control thyristor,detection,first of all will be subject to the light window with black paper stick tape cover,with the multimeter RX1 ~ RX10n block measurement the positive and negative resistance of the cathode K and the anode A should be very large.If the resistance is small or zero,the thyristor is damaged.Then remove the black paper or black tape,irradiate the window with a light source,measuring the anode and cathode resistance,should be reduced quickly,such as is still very large,it's bad.Q10.What is a four-terminal small power thyristor? The four-terminal small power thyristor is also called the silicon control switch ( SCS ), which is a multifunctional semiconductor device.Figure shows the internal structure equivalent circuit and circuit symbol of a four-terminal small power thyristor.It can be seen from the internal structure diagram that it is a PNPN four-layer four-terminal device, and the four leading-out terminals are anode A,anode gate GA cathode K and cathode gate GK the circuit shows that the four-terminal small power thyristor is composed of a PNP product tube V,and an NPN product body tube V.It has a high sensitivity,the gate trigger current is very small,only a few microamps,open.The time toFr and toFr are very short.