Patent ID: 7782019

Claim:
A movable partition system, comprising: at least one movable partition; a battery-backed power supply, comprising: a power converter with an alternating current (AC) input and a direct current (DC) output; a first diode operably coupled in a forward biased configuration between the DC output and a biased DC output; a supply switch configured for selectively coupling the biased DC output to a supply output; a battery operably coupled between a ground and a battery output; a battery switch configured for selectively coupling the supply output to a battery-charge signal; a current sensor operably coupled in series between the battery-charge signal and the battery output; a second diode operably coupled between the battery output and the supply output; and a controller configured for charging the battery by controlling the battery switch with a pulse-width modulation operation and configured for controlling the supply switch to cause the selective coupling between the biased DC output and the supply output; and a movable partition controller operably coupled to the supply output and including a motor configured for displacing the at least one movable partition.