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A commom-ground enhanced-gain buck/boost converter with continuous currents, low voltage stress and reduced switches
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Yang Qin1, Yuhan Liu2, Ling Qin2
Renewable Energy Resources | 2024, 42(3) : 361 - 369
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Renewable Energy Resources | 2024, 42(3): 361-369
A commom-ground enhanced-gain buck/boost converter with continuous currents, low voltage stress and reduced switches
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Yang Qin1, Yuhan Liu2, Ling Qin2
Affiliations
  • 1 College of Electronic and Information Engineering Jiangsu University Zhenjiang 212016 China
  • 2 School of Electrical Engineering Nantong University Nantong 226019 China
Published: 2024-03-20
Outline
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The boost capability of conventional Buck/Boost converter is weak and the power switches suffer from high voltage stress (equals the voltage at the highvoltage side (HVS)), reducing the conversion efficiency. Further, since the HVS current pulsates greatly, large capacity capacitors are required to meet the requirements of current ripple, decreasing the system reliability. Therefore, this paper proposes an improved Buck/Boost converter. By introducing one switch, one inductor and two capacitors into the conventional topology, the proposed converter has continuous input and output current, which greatly reduces the current stress of HVS filter capacitor. The voltage gain in Boost mode is increased to (2D₁)/(1D₁), and all switches have the same low voltage stress, which equals the difference between the voltages at lowvoltage side (LVS) and HVS, so it has higher conversion efficiency. The operation principle, steadystate characteristics, dynamic model and control strategy are analyzed in detail. Its feasibility is verified on a 100 W/120 kHz prototype. The experimental results demonstrate an enhanced efficiency performance over wide operating operations with a maximum efficiency of 95.6%.

bidirectional DC-DC converter  /  voltage stress  /  current stress  /  voltage gain
Yang Qin, Yuhan Liu, Ling Qin. A commom-ground enhanced-gain buck/boost converter with continuous currents, low voltage stress and reduced switches[J]. Renewable Energy Resources, 2024 , 42 (3) : 361 -369 .
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Year 2024 volume 42 Issue 3
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Article Info
  • Receive Date：2023-03-31
  • Online Date：2025-07-22
  • Published：2024-03-20
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  • Received：2023-03-31
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Affiliations
    1 College of Electronic and Information Engineering Jiangsu University Zhenjiang 212016 China
    2 School of Electrical Engineering Nantong University Nantong 226019 China
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