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Pat. 11437944 United States, Int. Cl.22 H02P 21/18, H02M 7/48, H02P 21/16, H02P 21/22, H02P 21/24, H02P 23/14. Power conversion device : Appl. N 17/254686 : Filed 29.05.2019 : Pub. 06.09.2022 : / Kazuaki Tobari, Yoshitaka Iwaji, Agnes Hadinata, Yusaku Onuma, Takuya Sugimoto, Atsuhiko Nakamura, Hiroshi Watanabe, Yoshiyuki Taguchi ; Assignee Hitachi Industrial Equipment Systems Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11437944/en?oq=US11437944.html (дата обращения: ДД.ММ.ГГГГ).