Uninterruptible power supply with a back-up battery coupled acro

Details Uninterruptible power supply with a back-up battery coupled acro Uninterruptible power supply with a back-up battery coupled acro

1995-01-10

1997-03-11

Sterrett, Jeffrey L.

Electric power conversion systems

Current conversion

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

307 66, H02M 5458, H02J 904

Patent

active

056108052

ABSTRACT:
A power supply typology in which the pulse width modulated invertor switches serve two functions; conversion of the a.c. input to a d.c. rail voltage in addition to inversion of the d.c. rail voltage to a regulated a.c. output. An a.c. input ground terminal is connected to a node between two of the invertor switches and this node is also connected to the a.c. output to provide a common ground between the a.c. input and the a.c. output. A silicon control rectifier switch and one of the invertor switches connected to the ground node connect the back-up battery to the a.c. source during positive half cycles of the a.c. input in order to maintain a charge on the back-up battery.

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