US 11,728,747 B2
Soft switched voltage source inverter
Indra Prakash, Bangalore (IN); Damir Klikic, Waltham, MA (US); and Chandrasekaran Jayaraman, Bangalore (IN)
Assigned to SCHNEIDER ELECTRIC IT CORPORATION, Foxboro, MA (US)
Filed by SCHNEIDER ELECTRIC IT CORPORATION, Foxboro, MA (US)
Filed on Jul. 27, 2021, as Appl. No. 17/386,019.
Claims priority of application No. 202011032979 (IN), filed on Jul. 31, 2020.
Prior Publication US 2022/0038029 A1, Feb. 3, 2022
Int. Cl. H02M 7/5387 (2007.01); H02M 1/00 (2006.01); H02M 1/12 (2006.01); H02J 9/06 (2006.01); H02M 7/48 (2007.01); H02M 7/00 (2006.01)
CPC H02M 7/53873 (2013.01) [H02J 9/062 (2013.01); H02M 1/0003 (2021.05); H02M 1/0058 (2021.05); H02M 1/126 (2013.01); H02M 7/003 (2013.01); H02M 7/4815 (2021.05)] 23 Claims
OG exemplary drawing
 
1. An inverter comprising:
a midpoint;
an input configured to be coupled to a DC source and to receive input DC power from the DC source;
an output configured to be coupled to a load and to provide output AC power to the load;
a plurality of DC rails coupled to the input and configured to receive the input DC power from the DC source, wherein the plurality of DC rails includes a first DC rail and a second DC rail;
a plurality of switches coupled between the plurality of DC rails and configured to convert the input DC power into the output AC power, each switch of the plurality of switches having a parasitic capacitance, wherein the plurality of switches includes a first switch coupled between the first DC rail and the midpoint and a second switch coupled between the second DC rail and the midpoint; and
at least one zero-voltage switching (ZVS) network coupled across at least two switches of the plurality of switches, the ZVS network including at least two inductors configured to resonate with the parasitic capacitance of at least one switch of the plurality of switches to provide soft switching of at least one switch of the plurality of switches, wherein the at least one ZVS network includes a first auxiliary switch, a first diode, a first inductor coupled in series between the first DC rail and the midpoint and a second auxiliary switch, a second diode, and a second inductor coupled in series between the second DC rail and the midpoint.