US 12,278,556 B2
Control device and power conversion device
Daiki Terashima, Tokyo (JP); Yoshihiro Tawada, Tokyo (JP); Tomoya Katsukura, Tokyo (JP); and Issei Fukasawa, Tokyo (JP)
Assigned to TMEIC Corporation, Chuo-ku (JP)
Appl. No. 18/004,607
Filed by TMEIC Corporation, Chuo-ku (JP)
PCT Filed Jun. 25, 2021, PCT No. PCT/JP2021/024231
§ 371(c)(1), (2) Date Jan. 6, 2023,
PCT Pub. No. WO2022/269929, PCT Pub. Date Dec. 29, 2022.
Prior Publication US 2023/0275528 A1, Aug. 31, 2023
Int. Cl. H02M 1/32 (2007.01); H02M 1/12 (2006.01); H02M 7/48 (2007.01)
CPC H02M 1/32 (2013.01) [H02M 1/126 (2013.01); H02M 7/48 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A control device of a power conversion device, comprising:
a conversion value calculation circuit that acquires a current value of a current flowing in an alternating-current capacitor connected to a capacitor circuit in an output circuit on an alternating-current side of an inverter circuit and performs conversion of the current value to obtain a conversion value;
a failure detection circuit that compares the conversion value obtained by the conversion value calculation circuit and a determination value to be used in failure detection to detect a failure of the alternating-current capacitor; and
determination value calculation circuit that acquires a voltage value of an output voltage of the inverter circuit, and obtains the determination value to be used in failure detection from the voltage value,
wherein the failure detection circuit compares the conversion value obtained by the conversion value calculation circuit and the determination value obtained by the determination value calculation circuit to detect the failure of the alternating-current capacitor.