ON-BOARD CHARGER FOR A BATTERY OF AN ELECTRIC VEHICLE

The invention relates to an on-board charger for a battery of an electric vehicle, comprising an input power interface being connectable to a power source of a charging system; a PFC circuit connected to the input power interface, an isolated DC/DC-converter connected to the PFC circuit, and an output power interface connected to the DC/DC-converter and configured to be connected to the battery of the electric vehicle. The PFC circuit is configured to vary an output voltage in a defined range, the output voltage being provided at an output voltage link of the PFC circuit. The DC/DC-converter comprises a bridge circuit connected to the output voltage link of the PFC circuit, a transformer circuit connected to the bridge circuit, and a rectifier circuit connected to the transformer circuit, wherein the transformer circuit comprises at least a transformer comprising a primary winding connected to the bridge circuit, and a secondary winding connected to the rectifier circuit, wherein at least one of the primary winding and the secondary winding comprises a center-tap dividing the at least one of the primary and the secondary winding into two winding portions, the two winding portions being connected to a switch circuit which is configured to change a turn ratio of the transformer by selectively integrating or excluding one of the two winding portions from the conductive circuit.