Patent ID: 9548630
Date: 2017-01-17
CPC Classifications: H02J,H02M,H05K

Claim:
1. An uninterruptible power supply apparatus, comprising: a combined converter/chopper circuit configured to convert a first AC power to DC power that is stored in a power storage device and to output the DC power stored in the power storage device during a power failure in which supply of the first AC power is stopped; an inverter to convert the DC power output by the combined converter/chopper circuit to a second AC power, said first AC power being three-phase AC power, and said combined converter/chopper circuit including three combined converter/chopper sub-circuits corresponding to three phases of said first AC power, respectively; a plurality of first coolers, each provided to a corresponding one of said combined converter/chopper sub-circuit to cool the corresponding one of said three combined converter/chopper sub-circuits; and a second cooler to cool said inverter, each of said combined converter/chopper sub-circuits and a corresponding one of said plurality of first coolers corresponding to the sub-converter making up a single unit, said inverter and said second cooler making up a single unit, each of said plurality of first coolers including a first flat plate portion having a first surface on which the corresponding one of said three combined converter/chopper sub-circuits is mounted, and a plurality of first fins provided on a second surface of said first flat plate portion, said second cooler including a second flat plate portion having a third surface on which said inverter is mounted, and a plurality of second fins provided on a fourth surface of said second flat plate portion, each of said combined converter/chopper sub-circuits including a plurality of first switching elements connected in series between a first node and a second node and a plurality of first diodes connected in antiparallel to said plurality of first switching elements, respectively, a plurality of second switching elements connected in series between said first node and said second node and a plurality of second diodes connected in antiparallel to said plurality of second switching elements, respectively, wherein a cooling capacity of each of said plurality of first coolers is one third of a cooling capacity of said second cooler.