Patent ID: 6720675
Filing Date: 2004-04-13
Classification: H02J,H02M

Abstract:
A power conversion apparatus comprising:first AC/DC conversion means including a first AC power supply, a first reactor, and first switching means, connected in series; a second AC/DC conversion means including a second AC power supply, a second reactor, and second switching means, connected in series; two capacitors connected in series, an interconnection point of the two capacitors being connected to a first terminal of each of the first and second AC power supplies, and the two capacitors receiving energy supplied by DC voltages produced by the first and second AC/DC conversion means; a load connected to the two capacitors; a battery connected to the two capacitors; and first switch means connected between the first AC power supply and the first reactor, connecting the first reactor to the first AC power supply if the first and second AC power supplies operate normally, and connecting the first reactor to a connection point between the second reactor and the second switching means if one of the first and second AC power supplies operates abnormally; second switch means connected between the second AC power supply and the second reactor, connecting the second reactor to the second AC power supply if the first and second AC power supplies operate normally, and connecting the first reactor and the second reactor in series by connecting the second reactor to an interconnection point between the two capacitors if one of the first and second AC power supplies operates abnormally; and a control apparatus that controls a voltage difference between the two capacitors, wherein, if the first and second AC power supplies operate normally, the control apparatus controls a current flowing to the first reactor using the first switching means to perform AC/DC conversion and controls a current flowing to the second reactor using the second switching means to perform AC/DC conversion, and if one of the first and second AC power supplies operates abnormally, the control apparatus controls the battery to supply energy to the two capacitors and controls the current flowing to the first reactor using the first switching means.