Uninterruptible power supply based on non-invasive connection of

Details Uninterruptible power supply based on non-invasive connection of Uninterruptible power supply based on non-invasive connection of

1995-06-16

1997-05-20

Wong, Peter S.

Electric power conversion systems

Current conversion

Including an a.c.-d.c.-a.c. converter

307 66, H02M 545, H02M 5458, H02J 700, H02J 900

Patent

active

056318146

ABSTRACT:
An uninterruptible power supply provides internal or external connection of an auxiliary power source to a main power supply so as to provide continuous device power without requiring any modification to the main power supply itself and without duplicating its power circuit. The uninterruptible power supply (UPS) comprises a switch power supply (SPS) including a rectifier, DC to DC converter and at least one holdover capacitor connected across the input terminals of DC to DC power converter. A backup system supplies DC power from a battery to the holdover capacitors, and a back up control circuit supplies high voltage DC energy to the SPS at fixed time intervals and ensures smooth transition to AC utility power upon resumption of such power following a failure. An auxiliary AC power output signal is maintained for a video monitor or other device during operation of the uninterruptible power supply.

REFERENCES:
patent: 4728808 (1988-03-01), Bet-Esh et al.
patent: 5229650 (1993-07-01), Kita et al.
patent: 5241217 (1993-08-01), Severinsky
patent: 5247205 (1993-09-01), Mototani et al.
patent: 5289045 (1994-02-01), Lavin et al.
patent: 5369561 (1994-11-01), McCullough
patent: 5369563 (1994-11-01), Miller
patent: 5371666 (1994-12-01), Miller
patent: 5461263 (1995-10-01), Helfrich
patent: 5465011 (1995-11-01), Miller
Dual-Output Power-Supply Controller for Notebook Computers, Max 786, Maxim Intergrated Products, 1993.

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