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AC power supply

In recent years, the internal power supplies of computers and other electrical and electronic equipment have become smaller, of lower weight, and less costly. Electronic equipment incorporating a power supply without a transformer typically have an input circuit consisting of an input bridge rectifier which produces direct current from the alternating current (AC) input power. Power supply circuits are commonly used in equipment such as uninterruptible power supplies (UPS), motor drives, and other applications. For example, a typical standby UPS topology includes a transfer switch that directly connects the load to a primary AC power source under normal conditions and that transfers the load to a secondary AC source derived from a battery or other auxiliary source when the primary AC power source fails. Standby UPSs often do not compensate for power quality, e.g., voltage degradation, harmonic distortion and low power factor. To compensate for the poor power factor of transformerless internal power supplies, computers and other products having such power supplies have been introduced which include power factor correction (PFC) circuits. Transformers and other high current devices such as those used for AC welding and other power applications include transformers, resistors, solid state electronic devices and the like which transform, control and regulate output voltage at current levels required for various purposes. Typical AC power supply sockets normally include a housing and a pair of slots extending inward from the surface of the housing and adapted for insertion of a pair of conductive prongs of an electrical plug.

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