A power converter is a power supply unit that not only delivers energy to an electronic device from an electrical outlet, but also regulates the current to meet the devices in specific requirements. If we have any type of sophisticated electronics such as computers, laptops, high end audio equipment, cell phones etc, the odds are they also incorporate a power supply unit that also regulates the current. Most power converters are usually called Switched Mode Power Supplies they include a power supply unit and a circuit inside the unit to regulate the current. A switched-mode power supply is an electronic power supply unit that incorporates a switching regulator. Switched Mode Power Supplies can be classified into four types according to the input and output waveforms:
*Alternative current in into Direct Current out is known as rectifier, off-line converter input stage
*Direct Current in into Direct Current out is known as voltage converter, or current converter, or DC to DC converter
*Alternative current in into Alternative current out is known as frequency changer, cyclo converter
*Direct Current in into Alternative current out is known as inverter
