Parameter design method of LLC resonant converter based on simplified time-domain equations

被引：0
|
作者：
Niu J. [1 ]
Wu X. [1 ]
Zhao Y. [2 ]
Jing L. [1 ]
Tong Y. [1 ]
Xin X. [1 ]
机构：
[1] School of Electrical Engineering, Beijing Jiaotong University, Beijing
[2] Shenzhen Power Supply Bureau Co., Ltd., Shenzhen
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2022年 / 42卷 / 06期
关键词：
LLC resonant converter; Parameter design; Peak voltage of resonant capacitor; Resonant parameter; Simplified time-domain equations;
D O I：
10.16081/j.epae.202204001
中图分类号：
学科分类号：
摘要：
The parameters of resonant elements in LLC resonant converter are the main factors affecting the gain, loss, volume of the converter, etc. However, most of the optimal design methods for resonant parameters have some shortcomings, such as low precision and complex algorithm. Based on the simplified time-domain equations, the operating conditions of switching frequency less than resonant frequency with heavy load are analyzed, and it is pointed out that the main factor affecting the gain is the inductance coefficient. At the same time, taking the resonant impedance as the key variable, the soft switching process and the peak voltage of the resonant capacitor are analyzed in time domain, and the relevant constraints are given. On the basis of the above analysis, an accurate, simple and fast design method to obtain the optimal value of resonance parameters is proposed. Finally, the proposed design method is verified by simulation and experiment. © 2022, Electric Power Automation Equipment Press. All right reserved.
引用
收藏
页码：103 / 110
页数：7
相关论文
共 18 条
  • [1] GU Zhanbiao, LI Zhibin, SHI Weijie, Et al., Applications and comparison of wide-bandgap devices in 1 kV high-frequency resonant DC-DC converters, Journal of Power Supply, 18, 1, pp. 150-161, (2020)
  • [2] AHMED M H, ROOIJ M A D, WANG J., High-power density, 900-W LLC converters for servers using GaN-FETs: toward greater efficiency and power density in 48 V to 6-12 V con-verters, IEEE Power Electronics Magazine, 6, 1, pp. 40-47, (2019)
  • [3] LIU Y C, CHEN C, CHEN K D, Et al., High-frequency LLC resonant converter with GaN devices and integrated magnetics, Energies, 12, 9, pp. 1-19, (2019)
  • [4] JIANG Youhua, FANG Mingshuo, WU Qina, Et al., Parameter design and test of electronic transformer with wide input vol-tage range, Power Electronics, 54, 4, pp. 132-136, (2020)
  • [5] ZHANG Yongming, LIN Jiawei, CHEN Junyao, Et al., Parameter design and optimization of LLC resonant converter in electric car charger based on DCM analysis, Power System Protection and Control, 48, 2, pp. 150-156, (2020)
  • [6] GU Shengjian, WANG Chunji, SHUAI Luwei, Et al., Parameter optimization and power density analysis of half-bridge LLC converter, Power Electronics, 54, 7, pp. 76-80, (2020)
  • [7] ZHAO Z, XU Q, DAI Y, Et al., Minimum resonant capacitor design of high-power LLC resonant converter for compre-hensive efficiency improvement in battery charging application, IET Power Electronics, 11, 11, pp. 1866-1874, (2018)
  • [8] XIN Xiaomin, JING Long, ZHAO Yuming, Et al., A novel parameter design method for LLC converters based on variable control, Advanced Technology of Electrical Engineering and Energy, 39, 10, pp. 29-38, (2020)
  • [9] LIU Shuo, SU Jianhui, LAI Jidong, Et al., Analysis on gain formula and mode boundary condition for LLC resonant converter in PO mode, Automation of Electric Power Systems, 44, 6, pp. 164-170, (2020)
  • [10] XU Hengshan, YIN Zhongdong, HUANG Yongzhang, Design method of LLC resonant converter considering maximum output voltage and efficiency, Transactions of China Electrotechnical Society, 33, 2, pp. 331-341, (2018)
12