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| Active Switched Inductor High Step-Up Converter with Voltage Multiplier Cell and Magnetic Integration |
| Li Hongzhu1, Chen Xingxing1, Li Chao1, Bao Yulin1, Li Hongliang2 |
1. Faculty 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 |
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Abstract In order to meet the voltage level requirements of DC microgrid, the research of high-step-up DC-DC converter has become a research hotspot. For the basic Boost converter, the voltage gain can reach infinity theoretically by increasing the duty cycle. However, the output voltage will decrease as the increase due to the influence of the parasitic parameters in actual circuit. Moreover, significant issues with reverse recovery and electromagnetic interference arise when operating under extreme duty cycle. Many researchers have proposed to introduce coupled inductors with appropriate turn ratio to improve the voltage gain of Boost converter. However, the coupled inductor essentially functions as a transformer, simultaneously its leakage inductor presents an unavoidable issue. Nevertheless, the leakage inductor will result in voltage spikes on semiconductors, thereby diminishing system efficiency. Additionally, the issue of electromagnetic interference has escalated. In order to overcome these problems, the researchers proposed an active clamp circuit, which can effectively suppress the voltage spikes of the power switches and recover the leakage energy to realize the zero current switching (ZCS) soft-switching of the power switches. However, this method increases the number of devices, the structure and control are more complicated.
This paper utilizes the active switched inductor structure to alleviate voltage and current stresses on the power switches. Meanwhile, the voltage multiplier cell (VMC) structures and switched capacitor are integrating with active switched inductor structure. Moreover, the inductor of active switched inductor is replaced by the coupled inductor, which has significantly improved the voltage gain of the proposed converter. In order to verify the correctness and feasibility of the theory, an experimental prototype with input voltage 24 V, output 400 V and full load power 360 W is built.
The proposed converter in this paper has the following characteristics: (1) The power switches are turned on simultaneously, resulting in a high voltage gain and convenient control. (2) The two diodes in the switched capacitor structure share the output voltage stress, thereby further improving the voltage gain. (3) The voltage stress of all switching devices in the proposed converter is low, less than half of the output voltage. (4) With the EIE core, the decoupling magnetic integration of two coupling coupled inductors can be realized without a lot of calculation and analysis, and the power density of the proposed converter can be further improved.
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Received: 22 March 2024
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2025, Vol. 40 
