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Pat. 10075117 United States, Int. Cl.22 H02P 1/26, F25B 49/02, H01F 30/14, H02M 1/14, H02M 7/06, H02P 27/04, H02P 13/06. Multi-pulse constant voltage transformer for a variable speed drive in chiller applications : Appl. N 15/031785 : Filed 21.01.2015 : Pub. 11.09.2018 : / Zhiqiao Wu, John C. Hansen ; Assignee Johnson Controls Technology Co ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10075117/en?oq=US10075117.html (дата обращения: ДД.ММ.ГГГГ).