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| High Gain Single-Switch DC-DC Converter with Three-Winding Coupled Inductor and Modified Switched-Capacitor |
| Li Chao, Li Hongzhu, Sun Xuanjin |
| Faculty of Electrical and Control Engineering Liaoning Technical University Huludao 125105 China |
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Abstract To address the practical limitations of non-isolated DC-DC converters, including insufficient voltage step-up capability, high voltage stress on switches, and relatively low efficiency, this paper proposes a high gain single-switch DC-DC converter based on a three-winding coupled inductor (TWCI) and a modified switched-capacitor (HSS-TWCI-MSC). In the proposed topology, the input inductor of the conventional Boost converter is replaced by a TWCI, and a switched-capacitor is integrated with a passive clamping branch to form a novel voltage multiplier cell. This structure significantly enhances voltage gain while effectively absorbing leakage energy from the leakage inductor, thereby reducing voltage stress on the switch and diodes. Furthermore, the leakage inductor of the TWCI enables zero-current switching (ZCS) for switch, which helps reduce switching losses and mitigates the reverse recovery issue of diodes, thus improving the overall system efficiency and reliability.
The paper provides a theoretical analysis of the proposed converter and its operating modes under continuous conduction modes. The key performance metrics such as voltage gain, voltage/current stresses, and RMS currents are derived. Additionally, the boundary condition of the proposed converter in DCM is analyzed, and an expression for the critical magnetizing inductor is presented. Moreover, the comprehensive loss analysis is established, evaluating the dominant loss contributions from the switch, diodes, capacitors, and magnetic components. A performance comparison with several state-of-the-art high-gain converters in the references reveals that the proposed converter achieves higher voltage gain with lower voltage stress and a more compact structure under the same input and output conditions.
To validate the theoretical analysis and assess the practical feasibility, a 400 W laboratory prototype was designed and implemented with an input voltage of 36 V, output voltage of 400 V, and a switching frequency of 50 kHz. Experimental results demonstrate that the proposed converter achieves a peak efficiency of 97.20% under 250 W load and maintains an efficiency of 96.92% at full load. Measured waveforms confirm key characteristics such as ZCS operation of the switch and low voltage stress. Furthermore, loss distribution analysis shows that the majority of losses are concentrated in the diodes and magnetic components, suggesting that further improvements can be achieved through optimized component selection and magnetic design refinement.
In summary, the proposed HSS-TWCI-MSC converter offers several compelling advantages: (1) By organically integrating the switched-capacitor used to absorb the leakage energy from the TWCI with a passive clamping branch, a novel voltage multiplier cell is constructed. This configuration not only effectively enhances the voltage gain but also significantly suppresses the voltage stress on semiconductor devices. (2) By combining the TWCI with the modified switched-capacitor, the proposed HSS-TWCI-MSC achieves high voltage gain while maintaining low voltage stress, thereby enabling the use of cost-effective and high-performance components. (3) By utilizing the leakage inductor of TWCI, the switch achieves ZCS turn-on, effectively reducing switching losses. Meanwhile, the leakage inductor also limits the current falling rate of diodes, alleviating their reverse recovery issues and reducing associated losses, thereby improving overall system efficiency. (4) The proposed HSS-TWCI-MSC converter employs only one switch, resulting in a simple control strategy that is beneficial for system implementation and stable operation.
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Received: 18 June 2025
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2026, Vol. 41 
