A high power density magnetically integrated scheme of LLC converter

Abstract To improve efficiency and power density within LLC converters, this paper presents a magnetically integrated scheme through the magnetoresistive model, which includes a resonant inductor and a transformer on one magnetic core. A magnetoresistive model is proposed to analyse the magnetic flux and is verified by simulation. Further, this paper investigates the fringing field near the core's air gap to prevent the occurrence of overheating and chaotic winding current distribution, optimizing the shapes of the transformer's secondary winding and core. A half‐brick (2.28″ × 2.4″ × 0.5″) LLC converter with a peak efficiency of 94.8% is then constructed using these integrated magnetic components, achieving a power density of 452 W/in. 3 , and maintaining a lower operating temperature of the core.