This paper presents a hybrid modulation method for single phase full bridge critical conduction mode (CRM) inverter aimed at improving the reactive power capability. The conventional unipolar modulation method causes a current distortion issue under non-unity power factor operation and faces an extremely high switching frequency problem at line current i <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">αc</inf> zero-crossing point. The proposed approach combines the benefits of unipolar modulation and bipolar modulation and resolves the current distortion problem. The discontinuous current mode (DCM) modulation is applied during i <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">ac</inf> zero-crossing area to eliminate the high switching frequency problem. The efficacy of the proposed modulation method is validated through both simulation and hardware experimentation.
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Chen et al. (2024) studied this question.
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