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| Wide Range Efficiency Optimization Control Strategy for LLC Resonant Converter Based on Parallel Transformer Switching |
| Liu Xiaodong, Dong Baocheng, Wu Huihui, Fang Wei, Liu Sucheng |
| Key Lab of Power Electronics & Motion Control Anhui University of Technology Maanshan 243000 China |
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Abstract A parallel switching transformer-based LLC (ST-LLC) multi-resonant converter was proposed in this paper. The transformer indirect parallel method and switching control strategy were used to construct a novel variable topology LLC based on the idea of variable inductance ratio k. The efficiency of the converter was effectively improved and the decentralized design of the transformer hot-spot was achieved, while maintaining soft switching characteristics. Detailed analysis for characteristics of voltage gain and the main operating modes was given. Besides, an optimal load partition control strategy was proposed based on the logic of transformer switching control, and wide range of high efficiency was achieved. Furthermore, the analytical formula of the maximum power of the transformer switching point was derived, and the design process of the main component parameters of the circuit was also given. A 1kW prototype was designed and manufactured, and the feasibility of the proposed scheme was verified by simulation and experiment. The working efficiency of the prototype could maintain more than 90% in the 82% load range.
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Received: 26 June 2019
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2020, Vol. 35 
