Patent ID: 6278355
Filing Date: 2001-08-21
Classification: H01F

Abstract:
A coil for a transformer comprising:a transformer core having a first end, a second end, and a longitudinal midpoint;a first winding on the transformer core comprising a conductive element wound around the transformer core in a plurality of coiled layers, a first layer of the first winding extending from a starting point at a location Z1 proximal the longitudinal midpoint of the transformer core to a location proximal the first end of the transformer core, a second layer of the first winding, successive of the first layer, extending from the location proximal the first end of the transformer core to a location Z2 proximal the longitudinal midpoint of the transformer core, a third layer of the first winding, successive of the second layer, extending from the location proximal the first end of the transformer core to a location Z3 proximal the longitudinal midpoint of the transformer wherein location Z1 is closer to the longitudinal midpoint of the transformer core than location Z2, and wherein location Z2 is closer to the longitudinal midpoint of the transformer core than location Z3; and a second winding on the transformer core comprising a conductive element wound around the transformer core in a plurality of coiled layers, a first layer of the second winding extending from a starting point at a location Z1' proximal the longitudinal midpoint of the transformer core to a location proximal the second end of the transformer core, a second layer of the second winding, successive of the first layer, extending from the location proximal the second end of the transformer core to a location Z2' proximal the longitudinal midpoint of the transformer core, a third layer of the second winding, successive of the second layer, extending from the location proximal the second end of the transformer core to a location Z3' proximal the longitudinal midpoint of the transformer, wherein location Z1' is closer to the midpoint of the transformer core than location Z2', and wherein location Z2' is closer to the midpoint of the transformer core than location Z3', wherein sequential taps are connected at spaced positions about the first winding and sequential taps are connected at spaced positions about the second winding, the spacing between the sequential taps connected to the first winding being equal to the spacing between the sequential taps connected to the second winding.