Design of LLC-Based AC-DC Converters

Currently, the demand for converters in electronic products is shifting towards higher efficiency, improved power factor, and reduced harmonic distortion. In response, we have developed an AC-DC converter. Through theoretical analysis of the main circuit, we designed a Power Factor Correction (PFC) circuit and an LLC full-bridge resonant circuit. Additionally, a prototype was built for experimental testing. The results demonstrated that the proposed AC-DC converter delivers outstanding performance, with high efficiency, a high power factor, and low ripple, effectively meeting market demands and offering significant practical value.