The
thyristor is a four-layer, three terminal semiconducting device, with each
layer consisting of alternately N-type
or P-type material, for example P-N-P-N. Four-layer devices act as
either open or closed switches; for this reason, they are most frequently used
in control applications. They stay on once they are triggered, and will go off
only if current is too low or when triggered off. The SCR is the most widely
used and important member of the thyristor family. The SCR is almost
universally referred to as thyristor. Common areas of application for SCRs are Time-delay circuits, regulated power suppliers,
static switches, motor controls choppers, battery charger and heater controls.
Etch..
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