What are the application of thyristor?

Thyristors may be used in power-switching circuits, relay-replacement circuits, inverter circuits, oscillator circuits, level-detector circuits, chopper circuits, light-dimming circuits, low-cost timer circuits, logic circuits, speed-control circuits, phase-control circuits, etc.

What are triacs used for?

Low-power TRIACs are used in many applications such as light dimmers, speed controls for electric fans and other electric motors, and in the modern computerized control circuits of many household small and major appliances.

How are opto TRIACs used in high power circuits?

Fortunately there are readily available solutions to this problem. Many high power circuits today are controlled by low voltage, low current circuits such as microprocessors, using opto electronic devices such as Opto−Triacs, Opto−Thyristors and Solid State Relays to isolate the low and high power circuits.

How does phase control work with a thyristor?

Phase control is the most common form of Thyristor power control. The Thyristor is held in the off condition — that is, all current flow in the circuit is blocked by the Thyristor except a minute leakage current. Then the Thyristor is triggered into an “on” condition by the control circuitry.

What kind of transistor is used in opto-coupler?

Opto-coupler which use Photo SCR. In the upper image the internal construction is shown inside a Photo-transistor Optocoupler. The Transistor type can be anything whether PNP or NPN. Photo-Transistor can be further of two types depending on the output pin availability.

How are thyristors used in solid state circuits?

A thyristor is a four layer solid-state semiconductor device with P and N type material. Whenever a gate receives a triggering current then it starts’ conducting until the voltage across the thyistor device is under forward bias.