A New Primary Side Resolution Scheme for Half-Bridge LLC Converter

This paper proposes an improved Primary Side Regulation (PSR) strategy for half-bridge LLC resonant converters by addressing the limitations of conventional PSR methods. Conventional PSR techniques often assume a negligible secondary-side leakage inductance and a significantly large magnetizing inductance, leading to output voltage estimation errors in practical scenarios. The proposed method compensates for variations in both parameters by identifying a more accurate sampling point based on leakage inductance behavior and applying a mathematical compensation model. Simulation results demonstrate that the proposed scheme significantly enhances voltage estimation accuracy and output regulation under varying load conditions.