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<p>This paper introduces a high-gain isolated quasi-Z-source DC-DC converter designed to achieve a substantial voltage boost through the utilization of transformer turns ratio using only a single power switch. The proposed topology reduces voltage stress on its semiconductors, limiting voltage stress to half the output voltage while ensuring continuous input current, a required feature for renewable energy systems. Furthermore, the converter generates bipolar and symmetrical output voltages, offering enhanced compatibility with bipolar DC microgrids. A significant advantage of the design is its self-balancing capability, maintaining stable bipolar voltages even under microgrid imbalance conditions caused by sudden load changes. This paper performs a comprehensive theoretical analysis, complemented by detailed simulations in the MATLAB Simulink to validate the proposed converter’s functionality. Moreover, experimental validation is conducted using a 315 W prototype, which demonstrated an output voltage of <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\pm 250 V\)</EquationSource> </InlineEquation>, achieving a high voltage gain of 18 and an efficiency of 92.98%. The converter’s unique features are highlighted through an extensive comparative study with other related topologies, underscoring its advantages over existing topologies. These results, supported by rigorous theoretical analysis, simulation results, and experimental evaluations, collectively establish the proposed converter as a high-performance solution for next-generation renewable energy applications. Additionally, dynamic analysis of the proposed converter is conducted, exhibiting a gain margin of 14.4 dB and phase margin of 93.9 deg that highlights its stability.</p>

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A novel high-gain isolated quasi Z-source DC-DC converter with self-balancing bipolar outputs

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  • 发表日期：

    2025年11月20日

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  • Sobhan Heidarbozorg,
  • Hamid Radmanesh

摘要

This paper introduces a high-gain isolated quasi-Z-source DC-DC converter designed to achieve a substantial voltage boost through the utilization of transformer turns ratio using only a single power switch. The proposed topology reduces voltage stress on its semiconductors, limiting voltage stress to half the output voltage while ensuring continuous input current, a required feature for renewable energy systems. Furthermore, the converter generates bipolar and symmetrical output voltages, offering enhanced compatibility with bipolar DC microgrids. A significant advantage of the design is its self-balancing capability, maintaining stable bipolar voltages even under microgrid imbalance conditions caused by sudden load changes. This paper performs a comprehensive theoretical analysis, complemented by detailed simulations in the MATLAB Simulink to validate the proposed converter’s functionality. Moreover, experimental validation is conducted using a 315 W prototype, which demonstrated an output voltage of \(\pm 250 V\) , achieving a high voltage gain of 18 and an efficiency of 92.98%. The converter’s unique features are highlighted through an extensive comparative study with other related topologies, underscoring its advantages over existing topologies. These results, supported by rigorous theoretical analysis, simulation results, and experimental evaluations, collectively establish the proposed converter as a high-performance solution for next-generation renewable energy applications. Additionally, dynamic analysis of the proposed converter is conducted, exhibiting a gain margin of 14.4 dB and phase margin of 93.9 deg that highlights its stability.