Ac/dc converter with galvanic insulation and signal corrector

Abstract

An AC/DC converter comprising an input rectifier circuit connected in series with a primary winding () of an isolating transformer () and to a chopper switch (T) driven by a control circuit () using pulse width modulation on the basis of a signal representative of a primary current, the isolating transformer having a first secondary winding () that is wound in the same direction as the primary winding and that is connected to an output line () of the converter via a diode (D) and a filter coil (L), and a second secondary winding () that is wound in the opposite direction to the primary winding and that is connected directly to the output line via a diode (D), the output line being connected to an output capacitor (Cout). The converter includes an analog correction circuit for correcting the primary current, which circuit is connected to the control circuit and to a measurement element () delivering a signal representative of the primary current, and is arranged to transform said signal into a triangular signal suitable for driving the control circuit.