Which type of chopper is generally used in high power circuits wh

SOLUTION

Chopper circuits are known as DC to DC converters. Similar to the transformers of the AC circuit, choppers are used to step up and step down the DC power. They change the fixed DC power to variable DC power.

Applications of Choppers:

Load Commutated Chopper:

In this type of commutation, the current through the SCR is reduced below the holding current value by resonating the load. In this type, the load circuit is so designed that even though the supply voltage is positive, an oscillating current tends to flow and when the current through the SCR reaches zero, the device turns off.

This type of chopper is used in Series Inverter circuits.

Current Commutated Chopper:

This is a type of commutation in which an LC series circuit is connected across the SCR. Since the commutation circuit has negligible resistance it is always under-damped i.e., the current in the LC circuit tends to oscillate whenever the SCR is on.

Voltage Commutated Chopper:

Voltage commutated choppers are widely used in high power circuits where load fluctuation is not large.