US 11,837,963 B2
Bidirectional power conversion
Hirotaka Karakama, Fukuoka (JP); Keisei Inoki, Fukuoka (JP); Yoichi Yano, Fukuoka (JP); Takahiro Uchino, Fukuoka (JP); and Toshihiro Hanada, Fukuoka (JP)
Filed by KABUSHIKI KAISHA YASKAWA DENKI, Kitakyushu (JP)
Filed on Aug. 30, 2021, as Appl. No. 17/460,334.
Claims priority of application No. 2020-146156 (JP), filed on Aug. 31, 2020.
Prior Publication US 2022/0069724 A1, Mar. 3, 2022
Int. Cl. H02M 5/297 (2006.01); H02M 5/27 (2006.01); H02M 1/32 (2007.01); H02M 5/293 (2006.01)
CPC H02M 5/297 (2013.01) [H02M 1/327 (2021.05); H02M 5/271 (2013.01); H02M 5/2932 (2021.05)] 20 Claims
OG exemplary drawing
 
1. A power conversion apparatus comprising:
matrix converter circuitry configured to perform bidirectional power conversion between a primary side and a secondary side; and
control circuitry configured to:
estimate an average heating level based on a secondary side current of the matrix converter circuitry and a carrier frequency;
calculate a concentration coefficient based on a primary-secondary frequency difference between a primary side frequency and a secondary side frequency of the matrix converter circuitry;
estimate a local heating level based on the average heating level and the concentration coefficient;
calculate a deterioration level based on the local heating level; and
output a deterioration notification in response to determining that the deterioration level exceeds a predetermined level.