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Pat. 10608554 United States, Int. Cl.22 H02M 3/335, B23K 9/10, H02M 3/315, H02M 5/458, H02M 7/48, H02M 7/505, H02M 7/523, H02M 7/797. Power supply having four quadrant converter and techniques for operation : Appl. N 16/291267 : Filed 04.03.2019 : Pub. 31.03.2020 : / Andrzej Mnich ; Assignee Esab Ab ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10608554/en?oq=US10608554.html (дата обращения: ДД.ММ.ГГГГ).