RESONANT POWER CONVERTER WITH CURRENT DOUBLER RECTIFIER AND RELATED METHOD

摘要

A power converter (10) for driving e.g. a lighting LED cell includes a transformer (Tl) having primary and secondary windings and a primary side switching bridge arrangement including at least two switches (Sl, S2) switcheable at a switching frequency (fsw) to drive the primary winding of the transformer (Tl). The primary side switching bridge arrangement is e.g. a half -bridge arrangement including one or more decoupling capacitor (CrI, Cr2). A secondary side rectifying and filtering stage is coupled to the secondary winding of the transformer (Tl). The rectifying and filtering stage is configured as a current doubler including at least one inductor (LrI, Lr2). The decoupling capacitor (s) in the primary side switching bridge arrangement and the inductor (s) in the current doubler of the secondary side rectifying and filtering stage comprise a resonant tank circuit having a resonant frequency range encompassing said switching frequency (fsw). The converter thus exhibits a gain defined by the position of the switching frequency (fsw) within the resonant frequency range of the resonant tank.