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| Magnetic Integrated Coupled Inductance Double Switch High Gain Combined Switched Capacitor Sepic Converter |
| Li Hongzhu1, Chi Cheng’ao1, Guo Yatao1, Li Hongliang2 |
1. School of Electrical and Control Engineering Liaoning Technical University Huludao 125105 China;
2. Schooling of Mining and Coal Inner Monggolia University of Science and Technology Baotou 014010 China |
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Abstract In recent years, high-gain DC-DC converters have been widely applied in renewable energy systems, industrial and information equipment, electric vehicles, and charging infrastructure. However, traditional high-gain coupled-inductor DC-DC converters suffer from limitations such as low voltage gain, which necessitates increasing the duty cycle or transformer turns ratio to achieve higher output voltage. It leads to increased losses in switches and diodes, reduced efficiency, and issues like larger transformer volume and leakage inductance, ultimately degrading converter performance. Consequently, research on DC-DC converters with high voltage gain, high power density, and high efficiency has become a focal point.
This paper proposes a magnetic-integrated coupled-inductor dual-switch high-gain combined switched- capacitor Sepic converter based on the traditional Sepic topology. The voltage gain is enhanced by integrating coupled inductor voltage-doubling technology with switched capacitor voltage-doubling technology at the rear stage. At the same time, a dual-switch unit is introduced at the front stage to reduce voltage stress on the switches. Magnetic integration is applied to the inductive components. The working principles of the proposed converter are analyzed, key performance parameters are derived, and methods for calculating losses and efficiency are provided. The rationality of the magnetic integration design is verified through magnetic simulation. Finally, an experimental prototype is constructed, and test waveforms are measured.
The proposed converter operates with an input voltage of 24 V, a transformer turns ratio of 1, and a duty cycle of 0.25, achieving an output voltage of 216 V and an output power of 200 W. By adjusting the load, the output power can be varied. Theoretical efficiencies at output powers of 160 W, 180 W, 200 W, 220 W, 240 W, and 260 W are 91.9%, 92.4%, 92.7%, 92.9%, 92.8%, and 92.1%, respectively. Under a 200 W load, the experimental efficiency reaches 92.4%.
To improve the performance of traditional high-gain DC-DC converters, this paper proposes a magnetic- integrated coupled-inductor dual-switch high-gain combined switched-capacitor Sepic converter. The converter exhibits the following features: (1) The converter can achieve a high voltage gain even at a low-duty cycle and a small turn ratio. When the duty cycle is 0.25 and the turn ratio is 1, the output voltage is 9 times the input voltage. (2) A diode-capacitor branch absorbs voltage spikes caused by leakage inductance, improving the converter's efficiency and limiting the voltage stress on the switches to approximately 23% of the output voltage. (3) By integrating discrete inductors with coupled inductors through magnetic integration technology, the number and volume of magnetic components are reduced, thereby significantly enhancing the overall power density of the converter.
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Received: 17 December 2024
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2025, Vol. 40 
