Patent ID: 6856524
Filing Date: 2005-02-15
Classification: H02J,H02M,Y02B

Abstract:
1. An uninterrupted power supply (UPS), comprising: first and second input terminals configured for connection to a power line source, the first input terminal configured for connection to a power line neutral; first and second output terminals, the first output terminal being configured for connection to the first input terminal through an uninterrupted conductor; a power factor correction (PFC) converter circuit configured to operate in an AC-powered mode as an AC to DC converter circuit, the PFC converter circuit having an input configured for connection to the first and second input terminals, a positive output terminal that produces a positive DC voltage, and a negative output terminal that produces a negative DC voltage; a positive voltage rail connected to the positive output terminal; a negative voltage rail connected to the negative output terminal; a DC to AC converter circuit that has an input connected across the positive and negative voltage rails and that provides an AC output at the first and second output terminals; and a connection circuit that connects a DC power source to the PFC converter circuit such that when the power line source fails and the UPS is in a DC-powered mode, voltage produced by the DC power source is converted through the PFC converter circuit to supply the positive and negative voltage rails.