Li Hongzhu1, Bao Yulin1, Chen Xingxing1, Li Hongliang2
1. School of Electrical and Control Engineering Liaoning Technical University Huludao 125105 China; 2. School of Mining and Coal Inner Mongolia University of Science and Technology Baotou 014010 China
Abstract：In recent years, high-gain converters have been widely used in industries such as new energy generation systems, electric vehicles, industrial automation, and information construction, and the demand is also increasing. However, classic boost converters cannot achieve high voltage gain, and excessively high-duty cycles can lead to a decrease in efficiency and an increase in voltage stress. Therefore, in-depth studies on high-gain converters have been conducted to meet high-gain needs. Currently, switching capacitor units, switching inductor units, and coupling inductor technology can be combined to achieve a high gain of converters. At the same time, magnetic integration technology can achieve miniaturization and light weighting of converters. Firstly, based on the classic quadratic converter, a magnetic integrated coupled inductor switched capacitor combination Boost converter is proposed by combining switch capacitor units, coupled inductor magnetic integration technology, clamp structure, topology combination and simplification, and device reuse. The working mode, voltage gain, and voltage stress are analyzed, and the losses and efficiency are calculated. A pie chart of the loss proportion in each theoretical calculation part is presented, and the design structure and parameters of the decoupled integrated magnetic component are presented. Simulation analysis is conducted based on the calculation results. Compared with other methods, the volume of integrated magnetic components can be reduced by about 21.5%. Finally, an experimental prototype is designed, and an experimental platform is built based on the existing conditions in the laboratory. The waveforms and the efficiency curves at different powers are obtained. The input side of the proposed converter is connected to an 18 V power supply, and the output voltage at a switching frequency of 50 kHz is 210 V. The size of the load is adjusted to output different powers. When the output power is 160, 180, 200, 220, 240, and 260 W, the corresponding efficiencies are 91.38%, 91.88%, 92.5%, 92.42%, 92.23%, and 92.1%, respectively. Under a 200 W load condition, the experimental efficiency reaches 92.5%. A magnetic integrated coupled inductor switched capacitor combination Boost converter is proposed for the front-end unit of new energy generation inverters. The topology of the converter has the following characteristics. (1) The voltage gain of the converter is related to the turn ratio and duty cycle of the coupled inductor. The voltage gain can reach 12 times when the turn ratio is 1 and the duty cycle is 0.5. (2) The input current of the converter is continuous, and its ripple is small. A lower voltage stress at both ends of the switch is always maintained at about 30% of the output voltage. (3) The converter adopts a clamp structure, which can effectively absorb and utilize the leakage inductance generated by the coupling inductance. (4) The decoupling magnetic integration technology reduces the number and volume of magnetic devices while maintaining the converter’s performance.
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2025, Vol. 40 
