Patent ID: 6069548
Filing Date: 2000-05-30
Classification: H01F,H05K

Abstract:
A planar transformer arrangement for an electric circuit located on a circuit board, the arrangement comprising:a first circuit board (PCB1) on which an electric circuit has been implemented,a supplementary circuit board piece (PCB2),a primary winding which comprises at least one substantially planar winding pattern,a secondary winding which comprises at least one substantially planar winding pattern, anda transformer core (F1, F2) which surrounds the primary and secondary windings at least partially,whereinboth the primary and the secondary windings are formed on said supplementary circuit board piece (PCB2); and whereinthe transformer core (F1, F2) is attached to the supplementary circuit board piece (PCB2), whereby the transformer core and the supplementary circuit board piece form together a separate planar transformer component (PT), anda hole (H') which corresponds to the transformer core has been formed on the first circuit board (PCB1) into which the planar transformer component (PT) has been inserted; and whereinthe supplementary circuit board piece is manufactured from a multiple layer circuit board and its outer edge features at least one recess (R) with a metal-coated surface, the supplementary circuit board piece being electrically connected to the first circuit board at the recess.