Power conversion apparatus and methods using balancer circuits
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United States of America Patent
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Nov 16, 2004
Issued Date -
N/A
app pub date -
Mar 25, 2002
filing date -
Aug 13, 1999
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Abstract
A power conversion apparatus, such as an uninterruptible power supply (UPS), includes an input port, an output port, and first and second busses. An output circuit, for example, a half-leg inverter, is coupled to the first and second busses and to the output port and operative to transfer power therebetween. An auxiliary DC voltage generator circuit, for example, a battery converter circuit, is operative to generate DC voltages on the first and second busses. A multifunction rectifier circuit is coupled to the input port and to the first and second busses, the multifunction rectifier circuit operative to generate DC voltages on the first and second busses from an AC power source at the input port when the apparatus is operating in a first mode (e.g., an AC powered operational mode). The multifunction rectifier circuit is operative to control relative magnitudes of the DC voltages generated by the auxiliary DC voltage generator circuit when the apparatus is operating in a second mode (e.g., a battery-powered operational mode). Related power conversion methods are described.
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