US 11,929,676 B2
Power conversion apparatus, motor drive apparatus, blower, compressor, and air conditioner
Motoya Suzuki, Tokyo (JP); Kenji Iwazaki, Tokyo (JP); Satoru Ichiki, Tokyo (JP); and Koichi Arisawa, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 17/641,672
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Nov. 14, 2019, PCT No. PCT/JP2019/044745
§ 371(c)(1), (2) Date Mar. 9, 2022,
PCT Pub. No. WO2021/095208, PCT Pub. Date May 20, 2021.
Prior Publication US 2022/0329156 A1, Oct. 13, 2022
Int. Cl. H02M 3/158 (2006.01); F24F 7/007 (2006.01); F25B 31/02 (2006.01); H02M 1/00 (2006.01); H02P 27/08 (2006.01)
CPC H02M 3/158 (2013.01) [F24F 7/007 (2013.01); F25B 31/026 (2013.01); H02M 1/0009 (2021.05); H02P 27/08 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A power conversion apparatus comprising:
a converter circuit comprising unit converters corresponding to a respective plurality of phases and converting an alternating current voltage output from an alternating current power supply into a direct current voltage, the unit converters each comprising a reactor and at least one switching element;
a current detector detecting a sum of currents flowing through the reactors;
a voltage detector detecting an output voltage of the converter circuit; and
a control device generating a reference duty on a basis of detection values detected by the current detector and by the voltage detector, and generating a pulse width modulation signal for controlling the switching element on a basis of a result of comparison between a corrected duty and a carrier signal, the corrected duty being obtained by correcting the reference duty, wherein
a carrier period is shorter than a power supply period, the carrier period being a period of the carrier signal and the power supply period being a period of the alternating current voltage,
when a first reference duty in a first carrier period differs from a second reference duty in a second carrier period subsequent to the first carrier period, a first corrected duty and a second corrected duty are controlled to have different values from each other,
the first corrected duty is a corrected duty of a first phase in a first carrier period in one power supply period after, and
the second corrected duty is a corrected duty of a second phase in the first carrier period in the one power supply period after.