公开(公告)号：US10734834B2

公开(公告)日：2020-08-04

申请号：US15997120

申请日：2018-06-04

Applicant: ABB Schweiz AG

Inventor： Zhiguo Pan ,  Adil Oudrhiri ,  Zichi Zhang ,  Yu Du

IPC: H02J9/06 ,  H02J3/18 ,  H02J7/00 ,  H02J4/00 ,  H03K17/56

Abstract: A resonant turn-off circuit is provided to disconnect an inadequate power source and transfer a load to an alternate power source. In the circuit, a main switch is turned off before the AC cycle of the power source crosses zero. As a result, the main switch may be turned off quickly to transfer electric power supplied to a load to a second power source. The circuit may include resonant switches, a capacitor, a pre-charging power supply and an inductor. When it is desired to turn off the main switch, a resonant switch is turned off to cause a voltage reversal across the switch.