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Pat. 9893609 United States, Int. Cl.22 H02M 3/335, H02M 1/42. Method to operate a resonant converter at a characteristic frequency of the power stage : Appl. N 14/705069 : Filed 06.05.2015 : Pub. 13.02.2018 : / Ivan Feno, Matthias Uhlmann ; Assignee Bel Power Solutions Inc ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9893609/en?oq=US9893609.html (дата обращения: ДД.ММ.ГГГГ).