US 11,990,846 B2
Power conversion apparatus, motor drive apparatus, blower, compressor, and air conditioner
Motoya Suzuki, Tokyo (JP); Satoru Ichiki, Tokyo (JP); Keisuke Uemura, Tokyo (JP); Koichi Arisawa, Tokyo (JP); and Kazunori Hatakeyama, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 17/641,137
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Nov. 14, 2019, PCT No. PCT/JP2019/044782
§ 371(c)(1), (2) Date Mar. 8, 2022,
PCT Pub. No. WO2021/095216, PCT Pub. Date May 20, 2021.
Prior Publication US 2022/0345050 A1, Oct. 27, 2022
Int. Cl. H02P 27/06 (2006.01); F24F 7/007 (2006.01); H02M 1/00 (2006.01); H02M 7/217 (2006.01)
CPC H02M 7/217 (2013.01) [F24F 7/007 (2013.01); H02M 1/0009 (2021.05); H02P 27/06 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A power conversion apparatus comprising:
a converter circuit comprising unit converters, the converter circuit 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;
a first controller causing the unit converters to operate sequentially to enable the current detector to detect a current corresponding to a single unit converter of the unit converters; and
a second controller controlling an operation of the unit converters on a basis of a result of comparison between a duty command and a carrier signal, the duty command being generated on a basis of detection values detected by the current detector and by the voltage detector, wherein
when the detection value detected by the current detector is less than or equal to a first threshold, the first controller is activated, and
when the detection value detected by the current detector is greater than the first threshold, the second controller is activated.