Battery voltage sensorless charge equalizer using the multi-winding transformer

A simple and easy magnetic coupling equalizer for a series-connected lithium-ion battery string is presented. The equalizer applies identical duty cycle to all active power switches without using the voltage sensing circuits and the secondary side components of multi-winding transformer. During the turn-on switching interval, the equalizer automatically transfers energy from the high-voltage battery cells to the low-voltage battery cells. The proposed equalizer can effectively reduce size, cost, and design complexity of the equalizer system.

[1]  Philip T. Krein,et al.  Equalization of valve-regulated lead-acid batteries: issues and life test results , 2000, INTELEC. Twenty-Second International Telecommunications Energy Conference (Cat. No.00CH37131).

[2]  Ming Tang,et al.  Selective buck-boost equalizer for series battery packs , 2000, IEEE Trans. Aerosp. Electron. Syst..

[3]  Yuang-Shung Lee,et al.  Quasi-Resonant Zero-Current-Switching Bidirectional Converter for Battery Equalization Applications , 2006, IEEE Transactions on Power Electronics.

[4]  Itsda Boonyaroonate,et al.  The low stress voltage balance charging circuit for series connected batteries based on buck-boost topology , 2003, Proceedings of the 2003 International Symposium on Circuits and Systems, 2003. ISCAS '03..

[5]  Mehdi Ferdowsi,et al.  Double-Tiered Switched-Capacitor Battery Charge Equalization Technique , 2008, IEEE Transactions on Industrial Electronics.

[6]  N. H. Kutkut.  Nondissipative current diverter using a centralized multi-winding transformer , 1997, PESC97. Record 28th Annual IEEE Power Electronics Specialists Conference. Formerly Power Conditioning Specialists Conference 1970-71. Power Processing and Electronic Specialists Conference 1972.

[7]  P.T. Krein,et al.  Electrical properties and equalization of lithium-ion cells in automotive applications , 2005, 2005 IEEE Vehicle Power and Propulsion Conference.

[8]  Koosuke Harada,et al.  Balanced charging of series connected battery cells , 1998, INTELEC - Twentieth International Telecommunications Energy Conference (Cat. No.98CH36263).

[9]  Philip T. Krein,et al.  Switched capacitor system for automatic series battery equalization , 1997, Proceedings of APEC 97 - Applied Power Electronics Conference.

[10]  Yuang-Shung Lee,et al.  Intelligent control battery equalization for series connected lithium-ion battery strings , 2005, IEEE Trans. Ind. Electron..

[11]  Donald W. Novotny,et al.  Design considerations for charge equalization of an electric vehicle battery system , 1995, Proceedings of 1995 IEEE Applied Power Electronics Conference and Exposition - APEC'95.

[12]  T. Gottwald,et al.  Equalization of EV and HEV batteries with a ramp converter , 1997, IEEE Transactions on Aerospace and Electronic Systems.

[13]  Chin-Sien Moo,et al.  Charge equalization for series-connected batteries , 2003 .

[14]  Douglas C. Hopkins,et al.  Extension of battery life via charge equalization control , 1993, IEEE Trans. Ind. Electron..