Power rectifier
An electrical power converter is a power processing circuit that may have an input-output isolation transformer and generally operates to convert an input voltage waveform with a DC component into an output DC voltage waveform. Power converters commonly referred to as "rectifiers" transform AC to DC, for example, to supply power from an AC source to a DC load. Rectifiers are electrical devices that are particularly adapted to rectifying current, that is converting alternating current to direct current. Power supply circuits typically include a rectifier circuit which converts an input alternating current (AC) input waveform to a direct current (DC) waveform. These rectifiers often pull harmonic currents from the source along with the desired fundamental signal. The harmonics impede the efficiency of power conversion and induce noise in load circuits. Power rectifiers have a variety of applications. For example, an important application of such rectifiers is in DC to DC voltage converters and power supplies for personal computers and other electronic devices and systems. Switched mode power supplies are clocked power supply units which chop a rectified, filtered mains voltage. Such switched mode power supplies are nowadays preferred to conventional power packs with power transformers for many cases of use since they have a better efficiency and require in particular less space. DC to DC power converters are power processing circuits which convert an unregulated input DC voltage to a regulated DC output voltage. Switch-mode DC-to-DC power converters typically include an inverter, a transformer having a primary winding coupled to the inverter, and a rectifying circuit coupled to a secondary winding of the transformer. The rectifying circuit rectifies the alternating voltage on the secondary winding to generate a desired DC output voltage. The most common rectifiers are semiconductor diodes, i.e., diodes which employ a PN semiconductor diode junction for rectification.
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