Patent ID: 7948774

Claim:
A resonant power converter for supplying an output power, comprising: a resonant circuit comprising: a transformer for supplying an output voltage, wherein the transformer receives a switched voltage input-and generates an output resonant current; a switching device for converting a voltage of an intermediate circuit into the switched voltage, the switching device comprising: an inverter circuit comprising a plurality of switches and respective components for defining a current flow path around said inverter circuit according to a switch configuration thereof; and a control device for selecting one of a plurality of switch configurations of said inverter circuit dependent on a required output power of said converter; wherein a frequency and pulse width of said intermediate circuit are adjusted such that switching events of said inverter circuit occur at or adjacent to zero crossings of said output resonant current; and wherein said plurality of switching configurations include first and second switching configurations for increasing or decreasing the resonant current by controlling the phase relationship of the switched voltage with resect to the resonant current.