Patent ID: 6744648
Filing Date: 2004-06-01
Classification: H02J,Y02E,Y02P

Abstract:
An active backup power supply with power correction factor (PCF) and output voltage regulation comprising:a) an AC power source; b) a PFC circuit electrically connected to and drawing a current with a controlled intensity and wave form the AC power source, the PFC circuit operating in a boost mode; c) an inverter having: i) switching components; and ii) a transformer having a first, a second, and a third output terminal, the first output terminal connected to an AC output terminal of the PFC circuit and drawing power from the PFC circuit; amplitudes of voltages on the first output terminal and the second output terminal with respect to the third output terminal are set at a predetermined ratio, the amplitude of voltage on the first output terminal is greater than the amplitude of voltage on the second output terminal; d) a backup power source electrically connect to the second output terminal of the transformer, the third output terminal of the transformer being a neutral bus for the backup power source; and e) a control circuit electrically connected to the inverter and generating a regulated output voltage, the control circuit electrically connected to the PFC circuit and drawing a high power factor current from the backup power source.