Nokia Corporation

Pentti Nieminen

Marko Laitinen

Chopper-type direct-current converter comprising a magnetic core (M), which comprises a first and a second side leg (MS , MS ), the ends of which are connected to each other with pieces, and a center leg provided with an air gap and connected to the end pieces between the first and the second side legs. According to the invention, the secondary side filter coil is wound around the center leg. The primary and secondary windings are wound around the side legs so that the magnetic flux produced by them flows in the same direction as the magnetic flux of the filter coil.

Direct current converter with integrated transformer windings and output voltage filtering coils on the same magnetic core

A direct-current converter converts an input voltage into an output voltage. It has and which comprises an operating voltage source, a power transformer having a primary side and secondary side, an input voltage source connected to the power transformer, at least one first power switch disposed on the primary side, and at least one second power switch disposed on the secondary side and rectifying the output voltage. The direct-current converter also has a regulating circuit, which is connected to the first power switch and the second power switch to control the timing of their switching functions, and an auxiliary power source arranged to supply power to the regulating circuit and connected to the operating voltage.

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Helsinki, Finland

Pentti Nieminen