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Multi-phase AC/AC step-down converter for distribution systems

United States Patent

October 24, 2017
View the Complete Patent at the US Patent & Trademark Office
A step-down AC/AC converter for use in an electric distribution system includes at least one chopper circuit for each one of a plurality of phases of the AC power, each chopper circuit including a four-quadrant switch coupled in series between primary and secondary sides of the chopper circuit and a current-bidirectional two-quadrant switch coupled between the secondary side of the chopper circuit and a common node. Each current-bidirectional two-quadrant switch is oriented in the same direction, with respect to the secondary side of the corresponding chopper circuit and the common node. The converter further includes a control circuit configured to pulse-width-modulate control inputs of the switches, to convert a first multiphase AC voltage at the primary sides of the chopper circuits to a second multiphase AC voltage at the secondary sides of the chopper circuits, the second multiphase AC voltage being lower in voltage than the first multiphase AC voltage.
Aeloiza; Eddy C. (Apex, NC), Burgos; Rolando P. (Blacksburg, VA)
ABB Schweiz AG (Baden, CH)
14/ 175,461
February 7, 2014
GOVERNMENT RIGHTS This invention was made with Government support under ARPA-E Cooperative Agreement DE-AR0000141 awarded by the Department of Energy (DOE). The Government has certain rights in this invention.