电力电子装置具有高效率、高功率密度、高可靠性等特点，广泛地应用在新能源发电、电动汽车、轨道交通、航空航天、工业生产、医疗设备等领域，具有十分广阔的应用前景。主要从事高性能电力电子变换器拓扑结构与控制策略的研究，已完成多项电力电子设备的研发任务，取得了一定的科研成果。目前，形成了以下三个主要研究方向：
(1)高效率电路拓扑结构的研究 研究新型的具有软开关特性的高效率电路拓扑结构，提高电能的利用率、拓宽电力电子技术的应用范围。
(2)极端环境下变换器的优化设计方法 研究宽温度范围、宽输入输出电压等极端工况下变换器的优化设计方法，提高设备运行的可靠性。
(3)基于数据驱动的变换器关键参数提取方法研究 借助变换器装置的历史运行数据，引入机器学习、人工智能等最新理论成果，提取出关键参数，为变换器的寿命预测、可靠性评估、优化运行提供依据。
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基于变压器耦合的组合型全桥拓扑及其软开关技术研究 代表性著作： [1]Lei Zhao, Haoyu Li, Chuanyu Xu, Xuemei Zheng. Efficiency Improvement of an Adaptive Energy Storage Full-Bridge Converter by Modifying Turns Ratio of Coupled Inductor[J]. IEEE Transactions on Power Electronics, 2018, 32(2), 948-956. (SCI, IF=7.15). [2] Lei Zhao, Haoyu Li, Xiao Wu, Jin Zhang. An Improved Phase-Shifted Full-Bridge Converter with Wide-Range ZVS and Reduced Filter Requirement[J]. IEEE Transactions on Industrial Electronics.( SCI, IF=7.168). [3] Haoyu Li, Lei Zhao. Chuanyu Xu, Xuemei Zheng. A Dual Half-bridge Phase-shifted Converter with Wide ZVZCS Switching Range[J]. IEEE Transactions on Power Electronics.( SCI, IF=7.15). [4] Lei Zhao, Haoyu Li, Yue Hou, Yanxue Yu. Operation Analysis of a Phase Shifted Full-Bridge Converter during the Dead-Time Interval[J]. IET Power Electronics, 2016, 9(9), 1777-1783.(SCI, IF=3.547). [5] Lei Zhao, Haoyu Li, Yanxue Yu, Yantian Wang. A Novel Choice Procedure of Magnetic Component Values for Phase Shifted Full Bridge Converters with a Variable Dead-Time Control Method[J]. Energies, 2015, 8, 9655-9669.(SCI, IF=2.262). [6] Lei Zhao, Haoyu Li, Yuan Liu, Zhenwei Li. High Efficiency Variable Frequency Full-Bridge Converter with a Load Adaptive Control Method Based on the Loss Model[J]. Energies, 2015, 8, 2647-2673.(SCI, IF=2.262). [7] Lei Zhao, Haoyu Li, Shufeng Liu, Weihe Zeng. Dual Mode Modulation Method for the Full-Bridge Converter Operating in a Wide Input Voltage Range[J]. Electronics Letters, 2016, 52(6), 470-471.(SCI , IF=1.155). [8] Lei Zhao, Chuanxu Xu, Xuemei Zheng, Haoyu Li. A Dual Half-Bridge Converter with Adaptive Energy Storage to Achieve ZVS over Full Range of Operation Conditions[J]. Energies, 2017, 10, 444.(SCI, IF=2.262). [9] Lei Zhao, Haoyu Li, Chao Wang, Yuan Liu. A Method of Optimizing the Switching Frequency Based on the Loss Analysis Model[C]. IEEE Industrial Electronics Society (IECON), Dallas, 2014:4103-4109(EI收录). [10] Lei Zhao, Haoyu Li, Yanxue Yu, Yutian Wang. Optimum Dead-Time Control method of Phase-Shifted Full-Bridge Converter to Extend the ZVS Range[C]. IEEE International Telecommunications Energy Conference (INTELEC), Osaka, 2015:1-4(EI收录). [11] Lei Zhao, Haoyu Li, Yanxue Yu, Yutian Wang. A Simple Control Method of Phase-Shift Full Bridge Converter to Reduce the Power Loss Under Light Load and Standby Conditions[C]. IEEE Energy Conversion Congress and Exposition (ECCE), Montreal, 2015:1485-1488(EI收录). [12] Lei Zhao, Haoyu Li, Yanxue Yu, Yutian Wang. A Novel Method of Phase-Shifted Full-Bridge Converter to Improve Efficiency under Light Load Condition[C]. IEEE International Conference on Power Electronics-ECCE Asia (ECCE Asia), Seoul,:2644-2649(EI收录).
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