Appeal No. 1996-3275
Application No. 08/038,469
in the application.
The invention is directed to uninterrupted power systems
(UPS) and, more particularly, to a power factor corrected UPS
that has an improved connection of the battery to the neutral
line.
Representative independent claim 1 is reproduced as
follows:
1. An uninterrupted power supply (UPS), having first and
second input terminals for connection to a power line source,
one of said terminals being connected to power line neutral,
first and second output terminals, one of said output
terminals being connected to said neutral through an
uninterrupted conductor, and a battery, comprising
a power factor correction (PFC) circuit having an AC to
DC converter circuit, an input connected across said input
terminals, and having a positive output terminal
providing a positive DC high voltage with respect to said
neutral and a negative output terminal providing a negative
high DC voltage with respect to neutral,
a high positive voltage rail connected to said positive
output terminal and a negative high voltage rail connected
to said negative output terminal,
an output circuit having an input connected across said
positive and negative rails, and providing an output to said
output terminals, and
battery connection circuit means for connecting said
battery to said PFC converter circuit so that when the
power line voltage fails and said UPS is in battery mode
operation, battery voltage is converted through said PFC
converter circuit to supply said positive and negative high
voltage rails.
2
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