Method and apparatus for interfacing battery backup to power fac

Details Method and apparatus for interfacing battery backup to power fac Method and apparatus for interfacing battery backup to power fac

1995-10-12

1998-04-07

Berhane, Adolf

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

323285, H02M 542

Patent

active

057372047

ABSTRACT:
A battery backup system using a power factor correction (PFC) front end as a DC-to-DC converter of a power supply for supplying a regulated DC input signal to a main power converter. The battery backup system includes a battery backup for supplying power, a switch circuit for connecting the battery in the event of loss of the AC input signal and a detection circuit for detecting the presence or absence of AC power for controlling the switch circuit. The PFC front end preferably receives either a pulsing DC voltage from a bridge rectifier or the battery voltage and switches this voltage through a series inductor for providing the regulated DC input voltage to the main power converter. The battery is switched in to replace the AC source and rectifier in the event of loss of the AC signal. In the preferred embodiment, the PFC circuit includes a series inductor and diode, a switching transistor and a control circuit for providing the regulated DC input voltage. The backup battery is coupled through a diode and a controlled switch to the input of the PFC circuit.

REFERENCES:
patent: 4694194 (1987-09-01), Hansel et al.
patent: 4779007 (1988-10-01), Schlanger et al.
patent: 4780802 (1988-10-01), Miyashita et al.
patent: 5126585 (1992-06-01), Boys
patent: 5132606 (1992-07-01), Herbert
patent: 5144222 (1992-09-01), Herbert
patent: 5315553 (1994-05-01), Stich et al.
patent: 5334926 (1994-08-01), Imaizumi

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