Patent ID: 7821801

Claim:
AC/DC converter, comprising: a rectifier having mains alternating voltage at its input terminals; a smoothing filter having an output connected to a load; a power factor correction device connected between an output of the rectifier and an input of the smoothing filter, wherein the power factor correction device comprises, connected in series, a frequency-increasing unit and a converter with parallel and series resonance alternation, the converter comprising a transformer with a primary winding and at least two secondary windings connected in series, wherein a coil is connected in series with one of the secondary windings and a capacitor is connected in series with another secondary winding, and a three-phase rectifier bridge, having a first input terminal connected to the coil, a second input, connected to a common point of the secondary windings and a third input, connected to the capacitor, wherein the converter with parallel and series resonance alternation comprises a controlled current by-pass circuit in capacitor branch which is connected to the common point of the secondary windings and to a point between the capacitor and the three-phase rectifier bridge.