Synthesis and Analysis of a Switched-Capacitor-Based Battery Equalizer Using Level-Shift Circuits
نویسندگان
چکیده
A switched-capacitor-based battery equalizer using level-shift circuits is proposed in this paper. In conventional equalizers using diode switches, the threshold voltage of diode switches causes a decrease in power efficiency. Unlike conventional equalizers, the proposed equalizer alleviates the threshold-voltage-drop of switches by using level-shift circuits. Therefore, the proposed equalizer can improve power efficiency. The properties of the proposed equalizer were investigated through SPICE simulations, theoretical analyses and experiments. SPICE simulations showed that 1. the proposed equalizer can improve power efficiency more than 40 % when output load is 1 k and 2. theoretical results corresponded well with SPICE simulation results. Therefore, the derived theoretical formulas will be helpful to estimate circuit properties of switched-capacitor-based battery equalizers. Furthermore, the experiments showed that the proposed equalizer can offer higher cell voltage than the conventional equalizer. Therefore, the proposed equalizer can achieve high power efficiency.
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