Protecting individual outputs against overload conditions in multiple-output flyback converters presents unique challenges because conventional primary-side current sensing cannot distinguish overloads on specific secondary outputs. This paper proposes a novel way of implementing a built-in overload protection for individual outputs in a multi-output flyback converter that utilizes a pulse-sharing control mechanism. The solution is implemented without the need to add an extra pin to be employed in an integrated chip (IC) nor discrete components to be implemented in the power supply. The proposed solution was derived in theory, executed experimentally, and was successfully implemented in an IC.
