Digital Compensator Design for LLC Resonant Converter

A half-bridge LLC resonant converter with Zero Voltage Switching (ZVS) and Pulse Frequency Modulation (PFM) is a widely used topology for DC/DC conversion. A Digital Signal Controller (DSC) provides component cost reduction, flexible design, and the ability to monitor and process the system conditions to achieve greater stability. The dynamics of the LLC resonant converter are investigated using the small signal modeling technique based on the Extended Describing Functions (EDF) methodology. A comprehensive description of compensator design for control of the LLC converter is also presented.