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The forced commutation can be classified into different methods as follows:

Class A: Self commutated by a resonating load
Class B: Self commutated by an LC circuit
Class C: Cor L-C switched by another load carrying SCR
Class D: C or L-C switched by an auxiliary SCR
Class E: An external pulse source for commutation
Class F: AC line commutation

The ripple factor of a half wave rectifier is 1.21

The final power amplifier in a radio transmitter station is usually class C.
The class C power amplifier is one kind of amplifier where the transistor conduct for less than 180? (one-half cycle of the input signal) and its typical value is 80? to 120?.
The reduced conduction angle progresses the efficiency to a great expand, but roots a lot of distortion.

A triac is a 4-layer semiconductor device with two power terminals (MT1 and MT2) and a gate terminal. It is used as a power control device for 50/60Hz AC mains applications. It is placed in series with the load connected across the mains. … A diac is a similar 4-layer device but does not have a gate terminal.

The DIAC is an electronics component that is widely used to assist even triggering of a TRIAC when used in AC switches and as a result they are often found in light dimmers such as those used in domestic lighting. These electronic components are also widely used in starter circuits for fluorescent lamps.

A silicon-controlled switch, or SCS, is essentially an SCR with an extra gate terminal.
Typically, the load current through an SCS is carried by the anode gate and cathode terminals, with the cathode gate and anode terminals sufficing as control leads.

This extra terminal allows more control to be exerted over the device, particularly in the mode of forced commutation, where an external signal forces it to turn off while the main current through the device has not yet fallen below the holding current value.

IGBT can switch current in the unidirectional that is in the forward direction( Collector to Emitter), whereas MOSFET has bidirectional current switching capacity.
Because, it controlled in the forward direction only. The working principle of gate drive circuits for the IGBT are like a N-channel power MOSFET.

UJT Triggering. It includes UJT Triggering SCR (Silicon Controlled Rectifier), Load resistor. A unijunction transistor (UJT) is an electronic semiconductor device that has only one junction. … The resistance between B1 and B2, when the emitter is open-circuit is called interbase resistance.

TRIACs are a subset of thyristors and are related to silicon controlled rectifiers (SCRs). TRIACs differ from SCRs in that they allow current flow in both directions, whereas an SCR can only conduct current in a single direction.

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