Document Type : Research Articles


1 Faculty of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, Iran

2 Tarbiat Modares University, ECE Department


Conventional energy storage systems (ESSs) such as super-capacitors and lithium-ion batteries require voltage equalization systems to eliminate voltage imbalances, and bidirectional dc-dc converters to complete the charging process. These separated systems require some sensors, inductors, switches, and transformers. Consequently, the ESSs volumes, prices, and their complexity are dramatically increased by increasing the required series connected batteries count. Here, a self-equalized battery charger is proposed for lithium-ion batteries by combining a voltage multiplier (VM) and a phase-shifted full-bridge (PSFB) dc-dc converter. In the proposed self-equalized battery charger, the voltage multiplier eliminates the voltage imbalances and the PSFB dc-dc converter carries out the charging process. By combining the voltage equalizing and the charging systems into a single system, an integrated converter is obtained which leads to simultaneous charging and equalization operations, power and control sections simplicity, as well as low volume and price. By utilizing the phase-shift control method, zero-voltage-switching (ZVS) operation of power MOSFETs is obtained which leads to high efficiency and low EMI noise. The experimental results for 8 battery modules including 48 lithium-ion cells, are in good agreement with the given mathematical analyses and simulations and clearly show the simultaneous charging and voltage equalizing operations, as well.


Main Subjects

[1] Shang, Y., Zhang, C., Cui, N., & Guerrero, J. M, “A
-to-cell battery equalizer with zero-current switching
and zero
-voltage gap based on quasi-resonant LC
converter and boost converter
,” IEEE Trans. Power
, Vol. 30, No. 7, pp. 3731-3747, Aug. 2014
[2] Haghbin, S., Khan, K., Lundmark, S., Alaküla, M.,
Carlson, O., Leksell,
M., & Wallmark, O, Integrated
chargers for EV's and
PHEV's: examples and new solutions,” XIX International Conference on Electrical
-ICEM, pp. 1-6, Sep. 2010
[3] Musavi, F., Craciun, M., Gautam, D. S., Eberle, W., &
Dunford, W. G
, “An LLC resonant DCDC converter for
wide output voltage range battery ch
arging applications,”
IEEE Trans. Power Electron
., Vol. 28, No. 12, pp.
-5445, Mar. 2013

4] Rachid, Aziz, Hassan El Fadil, and Fouad Giri, "Dual
stage CC
-CV charge method for controlling dc-dc power
converter in BEV charger,
" IEEE Mediterranean
Electrotechnical Conference (MELECON)
, Vol. 2, pp.
-79, May. 2018

5] Taheri, Asghar, and Nader Asgari, "Sliding Mode Control
of LLC Resonant DC
-DC Converter for Wide Output
Voltage Range in Battery Charging
," International
Journal of Industrial Electronics,
Control and
Optimization (IECO)
, Vol. 2, No. 2, pp. 127-136, Jan.

6] Lin, B-R., Kevin Huang, and David Wang, "Analysis and
implementation of full
-bridge converter with current
doubler rectifier,
" IEEE Trans. Ind. Electron., Vol. 152,
No. 5, pp. 1193
-1202, Sep. 2005

7] Zhao, L., Li, H., Wu, X., & Zhang, J, “An improved
-shifted full-bridge converter with wide-range ZVS
and reduced filter requirement,”
IEEE Trans. Ind.
, Vol. 65, No. 3, pp. 2167-2176, Aug. 2017
[8] Lee. Il-Oun, "Hybrid PWM-resonant converter for electric
hicle on-board battery chargers," IEEE Trans. Power
., Vol. 31, No. 5, pp. 3639-3649, Jul. 2015

9] Lee, Il-Oun, "Hybrid DCDC converter with phase-shift
or frequency modu
lation for NEV battery charger," IEEE
Trans. Ind. Electron
., Vol. 63, No. 2, pp. 884-893, Sep.

10] Uno, Masatoshi, and Akio Kukita, "Double-switch
equalizer using parallel
-or series-parallel-resonant inverter
and voltage multiplier for s
" IEEE Trans. Power Electron., Vol.
29, No. 2, pp. 812
-828, Apr. 2013

11] Uno, Masatoshi, and Koji Tanaka, "Double-switch
-transformer cell voltage equalizer using a
-bridge inverter and a voltage multiplier for
eries-connected Supercapacitors," IEEE Trans. Veh.
nol., Vol. 61, No. 9, pp. 3920-3930, Aug. 2012

12] Uno, Masatoshi, and Akio Kukita, "Single-switch
-transformer cell voltage equalizer based on
flyback resonant inverter and voltage multiplier
for series
-connected energy storage cells," IEEE Trans.
Technol., Vol. 63, No. 9, pp. 4232-4247, Mar. 2014

13] Lee, Y-S., and G-T. Cheng, "Quasi-resonant
-current-switching bidirectional converter for battery
equalization applications,
" IEEE Trans. Power
on., Vol. 21, No. 5, pp. 1213-1224, Sep. 2006

14] Lee, Yuang-Shung, and Ming-Wang Cheng, "Intelligent
control battery equalization for series connec
-ion battery strings," IEEE Trans. Ind. Electron.,
Vol. 52, No. 5, pp. 1297
-1307, Sep. 2005

15] Shang, Y., Cui, N., Duan, B., & Zhang, C, Analysis and
optimization of star
-structured switched-capacitor equalizers for series-connected battery strings,. IEEE
Trans. Power Electron
., Vol. 33, No. 11, pp. 9631-9646,
Dec. 2017

16] Hua, C. C., Chuang, C. W., & Fang, Y. H, “Low-cost
switched capacitor charge equaliser with cancellation

mechanism of alternating current
,” IET Power
, Vol. 9, No. 7, pp. 1454-1461, Jun. 2016

17] Moghaddam, Ali Farzan, and Alex Van den Bossche, "A
Battery Equalization Technique Based on Ćuk Converter

ncing for Lithium Ion Batteries," International
Conference on Modern Circuits and Systems Technologies

, Vol. 8, pp. 1-4, May. 2019

18] Park, S. H., Park, K. B., Kim, H. S., Moon, G. W., & Youn,
M. J
, “Single-magnetic cell-to-cell charge equalization
converter with reduced
number of transformer
IEEE Trans. Power Electron., Vo. 27, No. 6,
pp. 2900
-2911, Dec. 2011

19] Yarlagadda, Sriram, Tom T. Hartley, and Iqbal Husain, "A
management system using an active charge
equalization technique base
d on a DC/DC converter
" IEEE Trans. Ind. Applica, Vol. 49, No. 6, pp.
-2729, May. 2013

20] Yu, Yanqi, Raed Saasaa, Ashraf Ali Khan, and Wilson
"A Series Resonant Energy Storage Cell Voltage
Balancing Circuit,
" IEEE J. Emerg Sel. Top. Power
., May. 2019

21] Chuang, Po-Chun, Yao Ching Hsieh, You-Chun Huang,
and Chin
-Sien Moo, "Charge-Equalization Circuit with
Single Resonant E
nergy Tank for Series Batteries," ICIT,
394-398, 2019

22] Kim, Moon-Young, Jun-Ho Kim, and Gun-Woo Moon,
-cell concentration structure of a cell-to-cell
balancing circuit wi
th a reduced number of
" IEEE Trans. Power Electron., Vol. 29, No.
10, pp. 5285
-5297, Nov. 2013

23] Cai, Chunjian, Junyang Ma, Jianglin Nie, Yupei Wan, Lan
Ma, and Zeliang
Shu, "A Battery Equalizing Circuit Based
on Multi
-Winding Transformer," IEEE Applied Power
Electronics Conference and Exposition (APEC)
, pp.
-1460, Mar. 2020

24] Tavakoli, Atrin, Sayed Ali Khajehoddin, and John Salmon,
"A Modular Battery Voltage
-Balancing System Using a
-Connected Topology," IEEE Trans. Power
, Vol. 35, No. 6, pp. 5952-5964, Oct. 2019

25] Lim, C. S., Lee, K. J., Ku, N. J., Hyun, D. S., & Kim, R. Y,
A modularized equalization method based on
magnetizing energy for a series
-connected lithium-ion
battery string,”
IEEE Trans. Power Electron., Vol. 29,
No. 4
, pp. 1791-1799, Jun. 2013

26] Imtiaz, A. M., & Khan, F. H, “Time shared flyback
converter” based regenerative cell b
alancing technique for
series c
onnected Li-ion battery strings,” IEEE Trans.
Power Electron.
, Vol. 28, No. 12, pp. 5960-5975, Apr.

27] Lou, F., Song, Z., Wei, Y., Zhang, G., Wang, J., & Liang,
, “Design of Liquid Metal Battery Equalization System
on Bidirectional Flyback Circuit,” IEEE Conference
on Energy Convers
ion (CENCON), pp. 59-63, Oct. 2019.
[28] Zhan, Huaxia, Xin Xiang, Simon M. Lambert, Volker
Pickert, Haimeng Wu, and Xiang Lu
, "A cascaded
-based equalisation converter for series
connected battery cells,
" Vol. 6, No. 6, 2016

29] Chang, Y. C., Wang, S. C., Liu, Y. H., & Luo, Y. F, “An
Active Fast Equalizer for Series
-Connected Batteries with
Adaptive Balancing Current Control
Transportation Electrification Conference and
-Pacific (ITEC Asia-Pacific), pp. 1-5, Jun. 2018

30] Anno, T., & Koizumi, H, “Double-input bidirectional
DC/DC converter using cell
-voltage equalizer with flyback
IEEE Trans. Power Electron., Vol. 30,
No. 6
, pp. 2923-2934, Apr. 2014

31] Hannan, M. A., Hoque, M. M., Peng, S. E., & Uddin, M.
N, “
Lithium-ion battery charge equalization algorithm for
electric vehicle applications,”
IEEE Trans. Ind.
, Vol. 53, No. 3, pp. 2541-2549, Feb. 2017

32] Young, C. M., Chu, N. Y., Chen, L. R., Hsiao, Y. C., & Li,
C. Z
, “A single-phase multilevel inverter with battery
IEEE Trans. Ind. Electron., Vol. 60, No. 5,
1972-1978, Jul. 2012

33] Einhorn, M., Roessler, W., & Fleig, J, “Improved
performance of serially connected Li
-ion batteries with
active cell balancing in electric vehicles.
,” IEEE Trans.
Veh. Technol
, Vol. 60, No. 6, pp. 2448-2457, May. 2011

34] Liu, J., Xu, M., Zeng, J., Wu, J., & Eric, C. K. W,
Modified voltage equaliser based on CockcroftWalton
voltage multipliers for series
,” IET Electrical Systems in
, Vol. 8, No. 1, pp. 44-51, May. 2017

[35] M. Uno and K. Yashiro, "Tapped-Inductor-Based
Single-Magnetic Bidirectional PWM Converter Integrating
Cell Voltage Equalizer for Series-Connected
Supercapacitors," IEEE Trans. Power Electron., vol. 35,
No. 12, pp. 13157-13171, Dec. 2020