Patent ID: 6339320
Filing Date: 2002-01-15
Classification: H01F

Abstract:
A power transformer for a switching power supply, particularly for a stud welding device, comprising:a closed ring shaped core having a primary winding and a secondary winding thereon; said primary winding further including a plurality of primary packages (7), each said primary package having at least one primary lamella including a primary electrical conductor wound in one plane, said primary packages electrically connected in series; said secondary winding further including a plurality of secondary packages (9) of quantity at least one more than said plurality of primary packages, each said secondary package having at least one secondary lamella including a secondary conductor wound in one plane, and further wherein at least two of said secondary packages are connected in parallel and further include terminals arranged to permit selected of different output voltages and currents from said secondary winding; and wherein: said primary packages (7) and said secondary packages (9) are arranged in alternating parallel fashion wherein a first secondary package defines a topmost package and a last secondary package defines a bottommost package.