Rectifiers
A rectifier conv
erts alternating current input or AC input to DC output. These are further divided into two types.
erts alternating current input or AC input to DC output. These are further divided into two types.
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| Rectifier |
- Diode Rectifiers: Diode rectifiers convert AC input to a fixed DC output. These are called as uncontrolled converters as the turn ON and turn OFF of the switches cannot be controlled externally and the output is fixed for certain input. These are used in battery charging, electrochemical processing and power supplies etc.
- Phase-controlled rectifiers: Phase controlled converters convert fixed AC to variable DC. The output voltage of phase controlled converters can be varied by changing the turn ON of the switches. They are also called as line commutated or naturally commutated converters because they use line voltage for their commutation. The phase controlled converters are used in DC drives, HVDC etc.
DC Choppers:
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| chopper |
Choppers convert fixed DC voltage to a variable AC voltage. Choppers are used for either increasing or decreasing the level of DC voltage similar to that of a transformer in AC. Choppers are used in DC Drives, electric vehicles, trolley buses etc.
Inverters:
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| inverter |
Inverter converts fixed DC voltage to variable AC voltage with variable frequency. Inverters are used in Uninterruptible power supplies- UPS, HVDC transmission systems, drives etc.
AC Voltage Controllers:
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| AC voltage controller |
An AC Voltage controller converts fixed ac voltage to variable ac voltage at the same frequency of input. It alters the magnitude of the input voltage. AC voltage controllers are widely used in speed control of fans and pumps.
Cycloconverters:
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| cycloconverters |
Cycloconvertes convert fixed ac to variable ac with variable frequency. These are used for speed control of AC drives, Induction heating etc.
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