High Voltage Wide Range DC Auxiliary Power Supply Based on SiC Devices
Wang Yifeng1, Che Chaochang1, Chen Bo1, Bai Yu2, Zhang Xiangqian3
1. School of Electrical and Information Engineering Tianjin University Tianjin 300072 China; 2. Tianjin Entar Energy Technology Co. Ltd Tianjin 300100 China; 3. Tianjin Research Institute of Electric Science Co. Ltd Tianjin 300180 China
Abstract：Auxiliary power supplies are vital components of power conversion devices and must address the challenges of stable operation under high-voltage and wide-range input conditions in systems such as solar power stations. This research focuses on the issues of high voltage stress, high cost, and low efficiency in traditional flyback converters under high-voltage and wide-range input conditions, conducting research based on the cascaded flyback converter. The main work of the research includes: (1) Based on the two-stage cascaded flyback converter, its operating modes are analyzed, and the switching process considering parasitic parameters is delved into. Detailed analyses and modeling are conducted for the dynamic and static voltage distributions during the turn-off process. The dynamic voltage distribution process of MOSFETs in the cascaded flyback converter exhibits a positive feedback characteristic. The inherent delay of the drive signal leads to a voltage difference between the two switches, which is further amplified by the negative correlation between Coss and Vds, causing the voltage difference between the two switches to increase. When the sum of the two voltages reaches Vin+VR, the voltage difference stabilizes. During the static voltage distribution process, the switch voltage changes exponentially after dynamic voltage distribution. This process increases the loss in resistor R1 and elevates the voltage stress on the upper switch S2. Therefore, reasonable design of R1 is essential to reduce losses during parameter design. Additionally, the impact of drive capacitance and parasitic capacitance on the quasi-resonant turn-on process is analyzed, and the expression for the drive voltage of the upper switch is provided. Based on the comprehensive analysis, a novel parameter design method for the two-stage cascaded flyback converter is proposed to optimize the overall performance of the converter. (2) Peak current mode control is employed to enhance the system's response speed to wide voltage range inputs. Small-signal modeling is completed for the cascaded flyback converter under peak current control mode, and a type-II compensation is adopted to adjust the crossover frequency, improving the dynamic performance of the auxiliary power supply. (3) Utilizing SiC devices, a 100 W auxiliary power supply prototype with an input range of 300~1 500 V and an output of 24 V is constructed. The converter achieves a maximum efficiency of 93.4% during full operating conditions. The results validate the feasibility and correctness of the designed high-voltage, wide-range auxiliary power supply scheme. Efficient conversion of the auxiliary power supply is ensured under conditions of low cost, wide input range, and high voltage stress.
王议锋, 车超昌, 陈博, 白昱, 张向前. 基于SiC器件的高压宽范围直流辅助电源[J]. 电工技术学报, 2025, 40(3): 786-799.
Wang Yifeng, Che Chaochang, Chen Bo, Bai Yu, Zhang Xiangqian. High Voltage Wide Range DC Auxiliary Power Supply Based on SiC Devices. Transactions of China Electrotechnical Society, 2025, 40(3): 786-799.
[1] 李龙春, 嵇保健, 洪峰, 等. 1500 V三电平正激变换器[J]. 电工技术学报, 2018, 33(9): 2044-2054. Li Longchun, Ji Baojian, Hong Feng, et al.1 500V three-level forward converter[J]. Transactions of China Electrotechnical Society, 2018, 33(9): 2044-2054. [2] 高本锋, 陈淑平, 刘毅. 光伏与LCC-HVDC系统的次同步振荡耦合路径及阻尼特性分析[J]. 电力系统自动化, 2022, 46(24): 66-75. Gao Benfeng, Chen Shuping, Liu Yi.Analysis on coupling path and damping characteristics of sub-synchronous oscillation between photovoltaic and LCC-HVDC system[J]. Automation of Electric Power Systems, 2022, 46(24): 66-75. [3] 高圣伟, 祝庆同. 一种独立光储发电系统用宽输入范围非隔离三端口变换器[J]. 电工技术学报, 2023, 38(4): 970-982. Gao Shengwei, Zhu Qingtong.A wide input range non-isolated three-port converter for stand-alone PV storage power generation system[J]. Transactions of China Electrotechnical Society, 2023, 38(4): 970-982. [4] 刘计龙, 杨旭, 赵春朋, 等. 用于高压电力电子装置的辅助电源的设计[J]. 电源学报, 2012, 10(1): 12-17. Liu Jilong, Yang Xu, Zhao Chunpeng, et al.Design of auxiliary power supply for high voltage power electronics device[J]. Journal of Power Supply, 2012, 10(1): 12-17. [5] 胡亮灯, 孙驰, 赵治华, 等. 高电压宽范围输入低电压输出的DC-DC辅助电源设计[J]. 电工技术学报, 2015, 30(3): 103-114. Hu Liangdeng, Sun Chi, Zhao Zhihua, et al.Design of wide-range high voltage input low voltage output DC-DC auxiliary power supply[J]. Transactions of China Electrotechnical Society, 2015, 30(3): 103-114. [6] Song Xiaoqing, Huang A Q, Sen S, et al.15-kV/40-a FREEDM supercascode: a cost-effective SiC high-voltage and high-frequency power switch[J]. IEEE Transactions on Industry Applications, 2017, 53(6): 5715-5727. [7] Grbovic P J.High-voltage auxiliary power supply using series-connected MOSFETs and floating self-driving technique[J]. IEEE Transactions on Industrial Electronics, 2009, 56(5): 1446-1455. [8] Grbovic P J.Loss-free balancing circuit for series connection of electrolytic capacitors using an auxiliary switch-mode power supply[J]. IEEE Transactions on Power Electronics, 2009, 24(1): 221-231. [9] Zhang Fan, Ren Yu, Yang Xu, et al.A high input voltage auxiliary power supply utilizing automatic balanced MOSFET stack[J]. IEEE Transactions on Industrial Electronics, 2021, 68(11): 10654-10665. [10] Wang Tao, Lin Hua, Liu Shengsheng.An active voltage balancing control based on adjusting driving signal time delay for series-connected SiC MOSFETs[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2020, 8(1): 454-464. [11] 刘基业, 郑泽东, 李驰, 等. 电压自平衡碳化硅MOSFET间接串联功率模块[J]. 电工技术学报, 2023, 38(7): 1900-1909. Liu Jiye, Zheng Zedong, Li Chi, et al.An indirect series-connected SiC MOSFET power module with voltage self-balance[J]. Transactions of China Electrotechnical Society, 2023, 38(7): 1900-1909. [12] 许奕辰. 适用于高压大功率辅助电源应用的宽输入范围DC-DC变换器研究[D]. 南京: 南京航空航天大学, 2020. Xu Yichen.Research on wide input range DC-DC converter suitable for high voltage and high power auxiliary power supply application[D]. Nanjing: Nanjing University of Aeronautics and Astronautics, 2020. [13] Meng Tao, Ben Hongqi, Song Yilin, et al.Analysis and suppression of the circulating current influence in the input-series auxiliary power supply for high-input-voltage applications[J]. IEEE Transactions on Power Electronics, 2019, 34(7): 6533-6543. [14] 刘基业, 郑泽东, 李驰, 等. 电压自平衡碳化硅MOSFET间接串联功率模块[J]. 电工技术学报, 2023, 38(7): 1900-1909. Liu Jiye, Zheng Zedong, Li Chi, et al.An indirect Series-connected SiC MOSFET power module with voltage self-balance[J]. Transactions of China Electrotechnical Society, 2023, 38(7): 1900-1909. [15] Datasheet of MSC750SMA170B[Z/OL]. https://ww1.microchip.com/downloads/aemDocuments/documents/PSDS/ProductDocuments/DataSheets/Microsemi_MSC750SMA170B_SiC_MOSFET_Datasheet_B.PDF. [16] 周国华, 谭伟, 周述晗, 等. V 2控制Cuk变换器建模与瞬态性能分析[J]. 电工技术学报, 2021, 36(4): 820-830. Zhou Guohua, Tan Wei, Zhou Shuhan, et al.Modeling and transient performance analysis of V 2 controlled Cuk converter[J]. Transactions of China Electrotechnical Society, 2021, 36(4): 820-830. [17] 吴强. 具有同步整流的动态谷底导通模式高精度恒流原边反馈电源控制器集成方案研究[D]. 西安: 西安电子科技大学, 2017. Wu Qiang.Research on controller integration scheme of dynamic valley conduction mode high precision constant current primary feedback power supply with synchronous rectification[D]. Xi’an: Xidian University, 2017. [18] 秦振. 超宽电压范围双管反激准谐振式开关电源设计与研究[D]. 青岛: 青岛理工大学, 2018. Qin Zhen.Design and research of ultra-wide voltage range dual-transistor flyback quasi-resonant switching power supply[D]. Qingdao: Qingdao University of Technology, 2018
2025, Vol. 40 
