Science & Engineering |
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A NOVEL CHARGE AND DISCHARGE EQUALIZATION SCHEME FOR BATTERY STRINGS |
PAN Shang-zhi, QIAN Zhao-ming, LEI Na |
Dept. of Electrical Engineering, Zhejiang University, Hangzhou 310027, China |
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Abstract A novel charge/discharge equalization scheme is proposed in this paper. According to the states of batteries, two equalizing methods are adopted for equalization during different charging and discharging phases. A switched capacitor is utilized during high rate charging and discharging. During the later period of charging and discharging, an auxiliary low power DC/DC converter and the inherent switch modules of a control/monitor unit are used. So it is very simple and efficient. With the developed equalizer, the lifetime of a series battery string can be extended.
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Received: 27 September 1999
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