Abstract: A power source with an arrangement for restricting short-circuit current includes at least a primary-side switch block, a transformer unit and a rectifier. The rectifier includes switching transistors for rectifying the secondary side of the transformer. Operation of the rectifier depends on a control from a pulse-forming part of the primary-side switch block. Control for the switching transistors in the rectifier is interrupted when the output current of the rectifier exceeds a limit value. At least one other switch element is arranged parallel to each of the switching transistors in the rectifier to realize a secondary-side rectification in an overload situation.

Abstract: The invention relates to a method of manufacturing a magnetic power component and to a magnetic power component. The component comprises a multi-layer coil (1) which consists of several windings disposed in the layers, first and second electrical conductors (5, 6) which are electrically connected to the selected windings, and a first and a second core part (7, 8) which are arranged to direct magnetism to the windings. The first side (2) of the multi-layer coil (1) is provided with a cavity (9) and the first core part (7) is at least partially mounted in the cavity.

Abstract: The invention relates to a method of manufacturing a magnetic power component and to a magnetic power component. The component comprises a multi-layer coil (1) which consists of several windings disposed in the layers, first and second electrical conductors (5, 6) which are electrically connected to the selected windings, and a first and a second core part (7, 8) which are arranged to direct magnetism to the windings. The first side (2) of the multi-layer coil (1) is provided with a cavity (9) and the first core part (7) is at least partially mounted in the cavity.

Abstract: The invention relates to a planar transformer arrangement for an electric circuit located on a circuit board. The arrangement comprises (a) a first circuit board (PCB1) on which said electric circuit has been implemented, (b) a supplementary circuit board piece (PCB2), (c) a primary winding which comprises at least one substantially planar conductive pattern formed on a circuit board, (d) a secondary winding which comprises at least one substantially planar conductive pattern formed on a circuit board, and (e) a transformer core (F1, F2) which surrounds the primary and secondary windings at least partially. To create an inexpensive but efficient transformer structure suitable for use in an automatic manufacturing process, both the primary and the secondary windings have been formed on the supplementary circuit board piece (PCB2).