Le Sun (Member IEEE) received the B.S. , M.S. and Ph.D. degrees in electrical engineering from Xi’an Jiaotong University (XJTU), Xi’an, Shaanxi, China, in 2010, 2012 and 2017, respectively. He has been a member of Ship Integrated Power Technology Key Laboratory, Naval University of Engineering, Wuhan, Hubei, China, from 2013 to 2017. In 2017, he joined the NR Electric Co., Ltd, Nanjing, Jiangsu, China, where he worked as an R&D engineer. In 2020, he joined the faculty of the School of Electrical Engineering, Yanshan University, Qinhuangdao, Hebei, China, where he is currently a lecturer. His research interests include multilevel converters, multi-port power electronic transformers, hydrogen production power supplies using electrolysis, current source converters, etc. He has led one national foreign expert program, one general project of the natural science foundation of Hebei Province, one science research project of Hebei Education Department, and one cultivation project for basic research and innovation of Yanshan University. As the first author or corresponding author, he has published or accepted more than 10 SCI or EI indexed papers, obtained 9 authorized invention patents as the first inventor, and 1 authorized utility model patent. He also serves as a reviewer for journals such as TPEL, TIE, Journal of Power Supply (in Chinese), and Power Electronics (in Chinese).

Scientific research project:

1) National Foreign Experts Program (Y Category) (Y20240250): Compact Marine multiport hydrogen-electricity-coupled power conversion system; (Leader)

2) Natural Science Foundation of Hebei Province (E2024203205): Research on DC-Current-Bus-Coupled Multiport Power Electronic Transformer; (Leader)

3) Science Research Project of Hebei Education Department (QN2024202): Research on Composite Hub Multi-Port Converters for Port Hydrogen-Electric Coupling Systems; (Leader)

4) Cultivation Project for Basic Research and Innovation of Yanshan University (2021LGQN007): Research on Lightweight Multi-port Power Electronic Transformer Based on Common Current Loop; (Leader)

Main Published Papers:

[1] L. Sun, X. Guo, Y. Li, A. Syed, and P. Han, "Hierarchical dc current balancing strategy for multilevel current source converters based on differential mode sectional power and dual redundant vector regulation," IEEE Trans. Power Electron., vol. 41, no. 3, pp. 3608-3623, Mar. 2026, doi: 10.1109/TPEL.2025.3617325.

[2] L. Sun, X. Guo, A. Syed, and X. Wang, "Current-fed dual active bridge converter in the series-connected wind energy conversion system and its current-source-side start-up method," IEEE J. Emerg. Sel. Topics Power Electron., vol. 13, no. 6, pp. 7978-7992, Dec. 2025, doi: 10.1109/jestpe.2025.3587494.

[3] L. Sun, X. Guo, X. Wang, H. G. M. Qamar, and A. Syed, "Integration method of clamp circuit and auxiliary power supply for hybrid dab converters in series-connected battery swapping stations," IEEE Trans. Transp. Electrific., vol. 11, no. 5, pp. 12506-12518, Oct. 2025, doi: 10.1109/TTE.2025.3590718.

[4] L. Sun, Z. Wu, F. Xiao, X. Cai, and S. Wang, "Suppression of real power back flow of nonregenerative cascaded h-bridge inverters operating under faulty conditions," IEEE Trans. Power Electron., vol. 31, no. 7, pp. 5161-5175, Jul. 2016, doi: 10.1109/TPEL.2015.2477849.

[5] L. Sun, Z. Wu, W. Ma, F. Xiao, and X. Cai et al., "Analysis of the dc-link capacitor current of power cells in cascaded h-bridge inverters for high-voltage drives," IEEE Trans. Power Electron., vol. 29, no. 12, pp. 6281-6292, Dec. 2014, doi: 10.1109/TPEL.2014.2302081.

[6] L. Sun, Z. Liu, X. Guo, X. Wang, and L. Wang, "Multiphase stacked interleaved buck converter for hydrogen-production electrolysis with a low-voltage-stress ripple compensation circuit,", CSEE Journal of Power and Energy Systems, vol. 12, no. 1, pp. 401-410, Jan. 2026, doi: 10.17775/CSEEJPES.2022.07090.

[7] X. Guo*, S. Zhang, Z. Liu, L. Sun*, and Z. Lu et al., "A new multi-mode fault-tolerant operation control strategy of multiphase stacked interleaved buck converter for green hydrogen production," Int J Hydrogen Energy, vol. 47, no. 71, pp. 30359-30370, 2022/1/1, doi: https://doi.org/10.1016/j.ijhydene.2022.06.249.

[8] B. Wang, L. Sun*, N. Diao, L. Zhang, and X. Guo et al., "Gan-based step-down power converter and control strategy for hydrogen energy systems,"Energy Reports, vol. 9, pp. 252-259, April 2023, doi: https://doi.org/10.1016/j.egyr.2023.03.007.

[9] L. Sun, X. Guo, Y. Han, Z. Lu, and C. Hua, "A dc-current-bus-coupled multi-port power electronic transformer and its control strategy," in Proc. IEEE Int. Power Electron. Appl. Symp. (PEAS), Shanghai, China, 2021, pp. 1-6.

[10] L. Sun, Z. Wu, F. Xiao, X. Cai, and S. Wang, "Design of the pll for the speed sensorless stator-flux-oriented control of induction motors," in Proc.18th International Conference on Electrical Machines and Systems (ICEMS 2015),Pattaya, Thailand, 2015, pp. 1913-1918. 

[11] L. Sun, Z. Wu, F. Xiao, and X. Cai, and C. X., "Suppression of real power back flow of non-regenerative cascaded h-bridge inverters operating under faulty conditions," in Proc. 2014 IEEE Energy Conversion Congress and Exposition (ECCE), Pittsburgh, PA, USA, 2014,  pp. 3075-3082.

[12] L. Sun, F. Zhuo, and L. Xiong, "A fast multi-level space vector pwm method based on sequence cyclic shift," in Proc. 2012 IEEE International Symposium on Industrial Electronics, Hangzhou, China, 2012, pp. 40-45.

Main Authorized Patents:

[1] 孙乐, 刁乃哲, 高起兴, 艾哈迈德·赛义德,王晓晨, 一种钳位与辅助电源一体的恒流恒压变换器及其启动方法(A constant current and constant voltage converter with integrated clamping and auxiliary power supply and its starting method), ZL202510102124.9.

[2] 孙乐, 郭小强, 华长春, 一种电流源型多端口柔性并网接口装置及控制方法(A current source type multi-port flexible grid-connected interface device and control method), ZL202110704072.4.

[3] 孙乐, 郭小强, 刘兆国, 卢志刚,  华长春, 一种复合型交错并联直流变换电路及控制方法( A composite interleaved parallel DC conversion circuit and control method), ZL202110748906.1

[4] 孙乐, 郭小强, 张哲, 李争, 宋晓飞, 弗雷德·布拉布杰尔, 约瑟普·M·格雷罗. 一种一体式电磁联合制氢装置(An integrated electromagnetic hydrogen production device). ZL 2022 1 0986733.1.

[5] 孙乐, 郭小强, 张哲, 李争, 宋晓飞, 弗雷德·布拉布杰尔, 约瑟普·M·格雷罗. 一种一体式电磁解耦联合制氢装置(An integrated electromagnetic decoupling combined hydrogen production device). ZL202210986922.9.

[6] 孙乐, 谢晔源, 王宇, 姜田贵, 姚宏洋, 一种链式直流耗能装置及控制方法( A chain-type DC energy dissipation device and control method), ZL201910158847.5.

[7] 孙乐, 谢晔源, 姜田贵, 姚宏洋, 邹凯凯,王仙荣, 一种直流耗能装置的功率电压协调控制方法(A power-voltage coordinated control method for DC energy consumption device), ZL201910778660.5.

[8] 孙乐, 谢晔源, 姜田贵, 姚宏洋, 一种直流能量动态调节装置的容错控制方法(Fault-tolerant Control Method for a DC Energy Dynamic Regulation Device), ZL201910991832.7.

[9] 孙乐, 吴振兴, 蔡信健, 王书秀, 胡文豪, 防止有功回灌的高压变频器容错调制方法(Fault-tolerant modulation method for high-voltage frequency converters to prevent active backflow), ZL201510616663.0.

[10] 孙乐, 谢晔源, 王宇, 姜田贵, 姚宏洋, 一种链式直流耗能装置(A chain-type DC energy dissipation device), ZL201920271619.4.