13-08-2013, 03:04 PM
SCAR / Thyristor
Thyristor.ppt (Size: 90.5 KB / Downloads: 242)
An SCR (Thyristor) is a “controlled” rectifier (diode)
Control the conduction under forward bias by applying a current into the Gate terminal
Under reverse bias, looks like conventional pn junction diode
4-layer (pnpn) device
Anode, Cathode as for a conventional pn junction diode
Cathode Gate brought out for controlling input
How do you turn it OFF?
Cause the forward current to fall below the value if the “holding” current, IH
Reverse bias the device