| Title |
A Study of Voltage Balancing Method in Series-Connected EDLCs for High Power Applications |
| Authors |
Dae-Joong Cha ; Ji-Eun Baek ; Kwang-Cheol Ko |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2015.29.7.022 |
| Keywords |
Voltage Balancing ; Passive Balancing ; Series-Connected EDLCs ; Zener Diode |
| Abstract |
In this paper, the problem of voltage unbalancing in series-connected multiple electric double-layer capacitorsEDLCs) is studied. Good understanding of this problem is required in order to increase reliability and stability of an energy storage system comprising EDLCs. Existing methods to settle voltage unbalancing cannot mitigate the problem enough for each cell, since most method have been applied to each module. For equalizing between cells, Zener diode which is one of passive method have been well examined in literature. However, Zener have well not used in balancing due to heating problem. In addition, It is difficult to choose Zener diode fitted rating voltage of EDLC, because of its internal resistance. Thus, we proposed passive balancing using Zener diode by analyzing parasitic element of Zener and EDLC. To experimentally confirm the balancing effect, we compared in two occasions which are with and without passive. As a result, proposed passive balancing circuit mitigated unbalanced voltage gap between EDLCs. |