Resonant converter controlled by variable leakage inductance in the transformer (LIC)

A new method of control that permits the regulation of the output characteristics in a resonant power converter, whilst maintaining a constant switching frequency is presented. The control variable used in the regulation of the converter is the continuous variation of the transformer leakage inductance. The main advantages of this control method are the following: the design of all components in the power converter at only one frequency; the facility of parallel operation mode and synchronization; and the possibility to extend this control method to any resonant topology.