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Pat. 10153706 United States, Int. Cl.22 H02M 5/40, H02M 1/36, H02M 5/458, H02M 1/42. Precharge device applied in flying capacitor type multi-level converter circuit and frequency converter having the precharge device : Appl. N 15/805273 : Filed 07.11.2017 : Pub. 11.12.2018 : / Jianping Ying, Teng Liu, Yi Zhang, Yong Zeng ; Assignee Delta Electronics Inc ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10153706/en?oq=US10153706.html (дата обращения: ДД.ММ.ГГГГ).