• Yanfeng Shen
  • Huai Wang
  • Ahmed Al Durra
  • Zian Qin
  • Frede Blaabjerg

This paper proposes a new series resonant DC-DC converter with four configurable operation states depending on the input voltage and output voltage levels. It suits well for the DC-DC stage of grid-connected photovoltaic (PV) systems with a wide-input voltage range and different grid voltage levels, i.e., 110/120 V and 220/230/240 V. The proposed converter consists of a dual-bridge structure on the primary side and a configurable half- or full-bridge rectifier on the secondary side. The root-mean-square (RMS) currents are kept low over a fourfold voltage-gain range; The primary-side MOSFETs and secondary-side diodes can achieve zero-voltage switching (ZVS) on and zero-current switching (ZCS) off, respectively. Therefore, the converter can maintain high efficiencies over a wide voltage gain range. A fixed-frequency pulse width modulated (PWM) control scheme is applied to the proposed converter, which makes the gain characteristics independent of the magnetizing inductance and thereby simplifies the design optimization of the resonant tank. The converter topology and operation principle are first described. Then the characteristics, i.e., the dc voltage gain, soft-switching, and RMS currents, are detailed before a performance comparison with conventional resonant topologies is carried out. Furthermore, the design guidelines of the proposed converter are also presented. Finally, the experimental results from a 500-W converter prototype verify feasibility of the proposed converter.

Original languageEnglish
Article number8543853
Pages (from-to)1752-1764
Number of pages13
JournalIEEE Transactions on Industry Applications
Issue number2
Publication statusPublished - 2019

    Research areas

  • configurable output voltage, DC-DC converter, DC-DC power converters, Inverters, reconfigurable structure, Rectifiers, Renewable energy sources, Resonant converters, series resonant converter, Topology, wide input voltage range, Zero voltage switching

ID: 49467743