Abstract: An arrangement for transferring information between the secondary and primary circuit of a transformer wherein control information is transferred to the primary circuit of a power transformer by means of auxiliary windings in the same transformer. The auxiliary windings are arranged in pairs in the transformer core branches in such a manner that the magnetic fluxes (&PHgr;c) do not induce a voltage in the energy-transferring windings (pw1, pw2), and the voltages induced in the auxiliary windings by the magnetic flux (&PHgr;p) corresponding to the energy transfer are opposite both in the primary-side winding pair (cw1a, cw1b) and in the secondary-side winding pair (cw2a, cw2b). Thus the transfer of a control signal and the transfer of energy will not disturb one another. The transformer may be implemented as a planar structure on a printed circuit board.

Abstract: The invention pertains to an arrangement for transferring information between the secondary and primary circuit of a transformer. Control information is transferred to the primary circuit of a power transformer (20) by means of auxiliary windings in the same transformer. The auxiliary windings are arranged in pairs in the transformer core branches in such a manner that the magnetic fluxes (&phgr;c) do not induce a voltage in the energy-transferring windings (pw1, pw2), and the voltages induced in the auxiliary windings by the magnetic flux (&phgr;p) corresponding to the energy transfer are opposite both in the primary-side winding pair (cw1a, cw1b) and in the secondary-side winding pair (cw2a, cw2b). Thus the transfer of a control signal and the transfer of energy will not disturb one another. The transformer is advantageously realized as a planar structure on a printed circuit board.