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Pat. 11368019 United States, Int. Cl.22 H02M 1/42, H02J 3/01, H02J 3/16, H02J 3/18, H02M 7/217, G05B 11/42, H02M 1/12. Active filter device and air conditioner : Appl. N 17/425069 : Filed 02.04.2019 : Pub. 21.06.2022 : / Shuta Ishikawa, Shusaku Nakase, Keiichi Yamamoto, Keisuke Ishikura ; Assignee Mitsubishi Electric Corp ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11368019/en?oq=US11368019.html (дата обращения: ДД.ММ.ГГГГ).