Classification of Power Electronics Circuits
Classification of Power Electronics Circuits
AC to DC, AC to AC, DC to AC, DC to DC, static switches, rectifiers, and regulators.
Power Electronics Overview
Power electronics deals with the conversion and control of electric power using semiconductor switches. These circuits convert electrical energy from one form to another with high efficiency and precise control. The main classifications are based on input and output form: AC to DC, AC to AC, DC to DC, and DC to AC.
AC to DC
AC to DC converters are called rectifiers. They convert alternating current into direct current. If diodes are used, the circuit is an uncontrolled rectifier. If thyristors are used, it becomes a controlled rectifier, where output voltage can be adjusted by firing angle control.
AC to AC
AC to AC converters change one AC voltage level to another AC voltage level. They are used as AC voltage controllers or cycloconverters. AC voltage controllers change only the magnitude, while cycloconverters can change both magnitude and frequency.
DC to AC
DC to AC converters are called inverters. They convert DC power into AC power at the desired voltage and frequency. Inverters are widely used in UPS systems, solar power systems, motor drives, and backup power supplies.
DC to DC
DC to DC converters are also called choppers or switching regulators. They convert fixed DC into variable DC. The output is controlled by duty cycle, making them very useful in battery systems, DC drives, and regulated power supplies.
Static Switches
Static switches or static contactors use power semiconductor devices instead of mechanical contacts. They provide fast switching, long life, and silent operation. Depending on the supply, they are classified as AC static switches or DC static switches.
Regulators
Regulators are power electronic circuits that maintain a nearly constant output voltage or current despite changes in input or load. In practice, DC-DC converters often act as switching regulators, while linear regulators are a separate low-efficiency category outside the main power converter family.
Quick Classification List
>AC to DC: Rectifiers.
>AC to AC: AC voltage controllers and cycloconverters.
>DC to AC: Inverters.
>DC to DC: Choppers or switching regulators.
>Static switches: Semiconductor-based ON/OFF power switches.
>Regulators: Circuits that maintain constant output.
