AC-DC power converter

A method of converting an input AC voltage to an output DC voltage, the method comprising the steps of:

• providing an AC-DC power converter comprising:
• a rectification circuit configured to convert an input AC voltage to a rectified AC voltage;
• a power factor correction boost converter circuit configured to convert the rectified AC voltage to a first boosted DC voltage, wherein the first boosted DC voltage comprises AC ripple;
• a switched mode power supply output stage comprising a transformer;
• and
• a buck and/or boost converter having two input voltage terminals, wherein a first voltage input terminal is connected to the first boosted DC voltage, and wherein a second input voltage terminal is connected to a second DC voltage, wherein the second DC voltage is higher than the voltage on the first voltage input terminal within a predefined voltage range, and wherein an output DC voltage of the buck and/or boost converter is forwarded to the switched mode power supply output stage;
• operating the AC-DC power converter by adjusting switching of one or more switches in the buck and/or boost converter to generate the output DC voltage with reduced or eliminated AC ripple.