전력전자학회논문지 (The Transactions of the Korean Institute of Power Electronics)

  • 제24권4호
  • /
  • Pages.279-285
  • /
  • 2019
  • /
  • 1229-2214(pISSN)
  • /
  • 2288-6281(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
권호 표지
DOI QR코드

DOI QR Code

다중권선 변압기를 이용한 능동형 셀 밸런싱 회로의 에너지 전달 효율을 높이기 위한 향상된 스위칭 패턴

Enhanced Switching Pattern to Improve Energy Transfer Efficiency of Active Cell Balancing Circuits Using Multi-winding Transformer

  • Lee, Sang-Jung (Division of Electrical and Computer Engineering, UNIST) ;
  • Kim, Myoungho (Power Conversion & Control Research Center, KERI) ;
  • Baek, Ju-Won (Power Conversion & Control Research Center, KERI) ;
  • Jung, Jee-Hoon (Division of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology (UNIST))
  • 투고 : 2018.10.31
  • 심사 : 2019.02.12
  • 발행 : 2019.08.20
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

This study proposes an enhanced switching pattern that can improve energy transfer efficiency in an active cell-balancing circuit using a multiwinding transformer. This balancing circuit performs cell balancing by transferring energy stored in a specific cell with high energy to another cell containing low energy through a multiwinding transformer. The circuit operates in flyback and buck-boost modes in accordance with the energy transfer path. In the conventional flyback mode, the leakage inductance of the transformer and the stray inductance component of winding can transfer energy to an undesired path during the balancing operation. This case results in cell imbalance during the cell-balancing process, which reduces the energy transfer efficiency. An enhanced switching pattern that can effectively perform cell balancing by minimizing the amount of energy transferred to the nontarget cells due to the leakage inductance components in the flyback mode is proposed. Energy transfer efficiency and balancing speed can be significantly improved using the proposed switching pattern compared with that using the conventional switching pattern. The performance improvements are verified by experiments using a 1 W prototype cell-balancing circuit.

키워드

JRJJC3_2019_v24n4_279_f0001.png 이미지

Fig. 1. Current path of cell balancing circuit in the conventional flyback operation: (a) Mode 1, (b) Mode 2, (c) Mode 3, (d) Mode 4.

JRJJC3_2019_v24n4_279_f0002.png 이미지

Fig. 5. Current path of cell balancing circuit in the proposed flyback operation: (a) Mode 1, (b) Mode 2, (c) Mode 3, (d) Mode 4.

JRJJC3_2019_v24n4_279_f0003.png 이미지

Fig. 6. Equivalent circuit of mode 2 in the proposed flyback operation.

JRJJC3_2019_v24n4_279_f0004.png 이미지

Fig. 8. Key waveform in flyback operation.

JRJJC3_2019_v24n4_279_f0005.png 이미지

Fig. 9. Cell balancing in flyback operations.

JRJJC3_2019_v24n4_279_f0006.png 이미지

Fig. 2. Equivalent circuit of mode 3 in the conventional flyback operation.

JRJJC3_2019_v24n4_279_f0007.png 이미지

Fig. 3. Theoretical waveforms of the conventional flyback operation.

JRJJC3_2019_v24n4_279_f0008.png 이미지

Fig. 4. Energy transfer efficiency in flyback operations.

JRJJC3_2019_v24n4_279_f0009.png 이미지

Fig. 7. Theoretical waveforms of the proposed flyback operation.

TABLE I DESIGN PARAMETERS

JRJJC3_2019_v24n4_279_t0001.png 이미지

TABLE II EXPERIMENTAL RESULTS OF FLYBACK OPERATION

JRJJC3_2019_v24n4_279_t0002.png 이미지

참고문헌

  1. J. Kim, J. Shin, C. Chun, and B. H. Cho, "Stable configuration of a Li-ion series battery pack based on a screening process for improved voltage/SOC balancing," 2012 IEEE Transactions on Power Electronics, Vol. 27, pp. 411-424, Jan. 2012.
  2. M. Daowd, N. Omar, P. V. D. Bossche, and J. Van Mierlo, "Passive and active battery balancing comparison based on MATLAB simulation," 2011 IEEE Vehicle Power and Propulsion Conference, pp. 1-7, Oct. 2011.
  3. J. Qi and D. D. C. Lu, "Review of battery cell balancing techniques," in Proceedings of the Power Engineering Conference (AUPEC), pp. 1-6, Sep. 2014.
  4. M. Y. Kim, C. H. Kim, J. H. Kim, D. Y. Kim, and G. W. Moon, "Switched capacitor with chain structure for cell-balancing of lithium-ion batteries," IECON 2012- 38th Annual Conference on IEEE Industrial Electronics Society, pp. 2994-2999, Dec. 2012.
  5. C. Pascual and P. T. Krein, "Switched capacitor system for automatic series battery equalization," in Proc. IEEE 1997 Applied Power Electronics Conference, pp. 848-854, Feb. 1997.
  6. Z. Zhou, Y. Shang, B. Duan, and C. Zhang, "An any-cell(s)-to-any-cell(s) equalizer based on bidirectional inductor converters for series connected battery string," in 2016 IEEE 11th Conference on Industrial Electronics and Applications (ICIEA), pp. 2511-2515, Oct. 2016.
  7. J. Xu, S. Li, C. Mi, Z. Chen, and B. Cao, "SOC based battery cell balancing with a novel topology and reduced component count," Energies, pp. 2726-2740, May. 2013.
  8. S. J. Lee, M. Kim, J. W. Baek, and J. H. Jung, “Transformer design methodology to improve transfer efficiency of balancing current in active cell balancing circuit using multi-winding transformer,” The Transactions of the Korea Institute of Power Electronics, Vol. 23, No. 4, pp. 247-255, Aug. 2018. https://doi.org/10.6113/TKPE.2018.23.4.247