Application of three-phase resonant converter in high power DC supplies

A novel DC-DC converter using modified series-parallel resonant converter is proposed. The converter is analysed in detail using a Fourier series approach. The design curves for the converter are plotted using MATLAB. Based on the analysis and the design curves, a systematic design procedure is presented. A prototype DC-DC converter of 2.5 kW rating has been built using the design procedure. To verify its performance, the PSIM simulation and detailed experimental results are shown for different load conditions. Variable frequency control is implemented using a digital signal processor to regulate the output voltage under varying load conditions. The proposed converter maintains zero voltage switching for the entire load range and requires a narrow variation in the switching frequency for its output voltage regulation.