US 12,323,069 B2
Power conversion apparatus and air conditioner
Atsushi Tsuchiya, Tokyo (JP); Kazunori Hatakeyama, Tokyo (JP); and Yuichi Shimizu, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 18/256,077
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Feb. 16, 2021, PCT No. PCT/JP2021/005717
§ 371(c)(1), (2) Date Jun. 6, 2023,
PCT Pub. No. WO2022/176015, PCT Pub. Date Aug. 25, 2022.
Prior Publication US 2024/0022182 A1, Jan. 18, 2024
Int. Cl. H02M 5/458 (2006.01); H02P 27/06 (2006.01); H02P 27/08 (2006.01)
CPC H02M 5/458 (2013.01) [H02P 27/08 (2013.01); H02P 27/06 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A power conversion apparatus comprising:
a rectifier circuit that rectifies a first alternating-current voltage;
a reactor connected to the rectifier circuit;
a capacitor connected to an output end of the rectifier circuit;
an inverter that generates a second alternating-current voltage through operations of a plurality of switching elements and applies the second alternating-current voltage to a compressor motor including a stator and a rotor, the inverter being connected to the capacitor; and
a processor that performs operation controls on the plurality of switching elements, wherein
the processor causes the inverter to apply, to the compressor motor, the second alternating-current voltage having a higher frequency than when the compressor motor is in compression operation so as not to rotate the rotor, and
a regenerative current generates when the high-frequency second alternating-current voltage is applied from the inverter to the compressor motor and a current flows to the capacitor due to the regenerative current without impairing the capacitor, wherein
a regenerative current flows from the compressor motor to the capacitor until a current polarity reverses while the high-frequency second alternating-current voltage is output in a state of real vector.