| Abstract |
In this paper, A novel control scheme of LLC resonant converter is proposed to maximize energyharvest of photovoltaic resources by adapting an integrated transformer with variable magnetizinginductance adaptively. The proposed resonant converter changes its magnetizing inductance accordingto the PV panel operating condition, and thus it is possible to achieve a minimum circulating energyunder wide input voltage range by the appropriate DC gain of the resonant tank. In addition, theproposed method introduces the feedback loop based on the switching frequency to regulate themagnetizing inductance, and as a result, those advantages can be easily obtained in even wide outputpower levels. The operating principles of the proposed converter and its control structure are explainedin detail, and the design example of a 250-W converter is also presented by using the fundamentalharmonic analysis. Several simulation results under various conditions of PV source and output powerlevels are provided in order to verify its effectiveness. |
