High Power Factor Interleaved Boost AC-DC Converter with ZVS for Charging Battery Operated Vehicles

K. Siva Raman, B. Vaidiyanathan

Abstract


The aim of the project is to develop a high power factor and efficient AC-DC converter suitable for charging batteries that are used in
electric vehicles. The energy conversion during the battery charging is performed by an ac/dc converter. Boost converters are generally used to
realize input PFC and ac/dc conversion. In high power applications, interleaving continuous current mode PFC boost stages are used. A novel,
yet simple zero-voltage switching (ZVS) interleaved boost power factor correction (PFC) ac/dc converter used to charge the traction battery of
an electric vehicle from the utility mains is proposed here. The proposed converter implements soft switching through a simple passive auxiliary
circuit placed in between the two phases of the interleaved boost converter. This auxiliary circuit provides reactive current during the transition
times of the MOSFETs to charge and discharge the output capacitors of the MOSFETs. In addition, the control system effectively optimizes the
amount of reactive current required to achieve ZVS for the power MOSFETs. This optimization is crucial in this application since the converter
may work at very light loads for a long period of time. The proposed converter maintains ZVS for the universal input voltage, which includes a
very wide range of duty ratios.


Key words: AC/DC converter, continuous current mode (CCM), dc/dc converter, interleaved boost converter, power factor correction (PFC),
zero-current switching (ZCS), zero-voltage switching (ZVS).


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DOI: https://doi.org/10.26483/ijarcs.v4i4.1648

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