Isolated converter topology with integrated power-sharing for driving a large number of HB-LEDs

An isolated power converter topology is presented which uses an integrated passive power-sharing network for equal brightness levels in parallel LED branches. Analyses of discontinuous conduction mode (DCM) and continuous conduction mode (CCM) of converter operation have been performed. The DCM operation shows an improved performance and allows a reduced size of the required transformers compared to the CCM. Analyses of the power sharing quality with non ideal transformers have been performed, additionally. A prototype has been built and tested. Experimental results are in good correlation with theoretical predictions.