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<p>The steady-state DC bias of the transformer, which leads to core saturation, threatens the safety of transformer-based converters such as dual active bridges (DAB) and multi-active bridges (MAB) converters. This paper establishes a quantitative steady-state bias model of a MAB converter based on voltage asymmetry between the upper and lower legs in each half-bridge unit. The influences of the main circuit, including parasitic parameters such as the gate drive resistance and stray inductance, on the voltage-second product unbalance are revealed for both the ZVS and non-ZVS modes. Additionally, a voltage-second product sampling method based on an analog filter and integrator circuits is proposed to measure the DC bias instead of the traditional magnetizing current sampling method. A double pulse test experiment shows the accuracy of the steady-state DC bias model. Experimental results of DAB and three port MAB (TAB) converters show that the DC bias sampling method is simple but effective and can be applied for DC bias suppression.</p>

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Steady-state DC bias modeling and sampling method for multi-active bridge converters

  • 期刊论文

  • 发表日期：

    2025年12月12日

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  • Zhongchen Lu,
  • Shusheng Wei,
  • Changqing Du

摘要

The steady-state DC bias of the transformer, which leads to core saturation, threatens the safety of transformer-based converters such as dual active bridges (DAB) and multi-active bridges (MAB) converters. This paper establishes a quantitative steady-state bias model of a MAB converter based on voltage asymmetry between the upper and lower legs in each half-bridge unit. The influences of the main circuit, including parasitic parameters such as the gate drive resistance and stray inductance, on the voltage-second product unbalance are revealed for both the ZVS and non-ZVS modes. Additionally, a voltage-second product sampling method based on an analog filter and integrator circuits is proposed to measure the DC bias instead of the traditional magnetizing current sampling method. A double pulse test experiment shows the accuracy of the steady-state DC bias model. Experimental results of DAB and three port MAB (TAB) converters show that the DC bias sampling method is simple but effective and can be applied for DC bias suppression.