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Pat. 11146176 United States, Int. Cl.22 H02M 3/335, H02M 1/10, H02M 3/338, H02M 1/00. Switch-mode power supplies including three-level LLC circuits : Appl. N 16/805147 : Filed 28.02.2020 : Pub. 12.10.2021 : / James Sigamani ; Assignee Astec International Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11146176/en?oq=US11146176.html (дата обращения: ДД.ММ.ГГГГ).