Patent ID: 7859376
Filing Date: 2010-12-28
Classification: H01F

Abstract:
1. A transformer comprising: first, second and third magnetic cores; a first winding on the first magnetic core and having a first terminal configured to be connected to a first AC input phase; a second winding on the second magnetic core and having a first terminal configured to be connected to a second AC input phase; a third winding on the third magnetic core and having a first terminal configured to be connected to a third AC input phase; a fourth winding on the first magnetic core and having a first terminal connected to a second terminal of the third winding and a second terminal configured to be connected to an AC neutral; a fifth winding on the second magnetic core and having a first terminal connected to a second terminal of the first winding and a second terminal configured to be connected to the AC neutral; a sixth winding on the third magnetic core and having a first terminal connected to a second terminal of the second winding and a second terminal configured to be connected to the AC neutral; a seventh winding on the first magnetic core and having a first terminal connected to the first terminal of the first winding; an eighth winding on the second magnetic core and having a first terminal connected to the first terminal of the second winding; a ninth winding on the third magnetic core and having a first terminal connected to the first terminal of the third winding; a tenth winding on the first magnetic core and having a first terminal connected to a second terminal of the ninth winding and a second terminal configured to provide a first AC output phase; an eleventh winding on the second magnetic core and having a first terminal connected to a second terminal of the seventh winding and a second terminal configured to provide a second AC output phase; and a twelfth winding on the third magnetic core and having a first terminal connected to a second terminal of the eight winding and a second terminal configured to provide a third AC output phase.