ROHM Semiconductor, in cooperation with Nippon Chemi-Con Corp., has announced the development of a cell balancing IC that contributes to increased miniaturization, greater stability, and longer life for EDLCs (Electric Double Layer Capacitors), which are driving the adoption of energy regeneration applications in industrial equipment, automotive idling stop systems, and voltage sag (instantaneous voltage drop) countermeasures. The BD14000EFV-C integrates over 20 discrete components required for EDLC cell balancing on a single chip, reducing mounting area by 38% over conventional solutions while eliminating component variations, making it easy to configure compact, high reliability EDLC systems.
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In addition to cell balancing functionality for up to 6 cells, multiple ICs can be connected in series to enable simultaneous control of even more cells. The cell balancing voltage can be set between 2.4V and 3.1V, ensuring support for a variety of EDLCs. Flag output is also built in, along with an over-current detection voltage function with adjustable detection voltage setting based on the cell balancing voltage. In addition, AEC-Q100 qualification ensures worry-free use in automotive and other environments requiring high reliability.
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When connecting multiple EDLCs in series to support higher voltages, the voltage applied to each EDLC cell may vary, which can adversely affect the lifetime and shorten the amount of time they can be safely used. And up to now cell balancing operation has been achieved through discrete configurations, making it necessary to address a number of issues such as board space and design load in order to minimize fluctuations while maintaining reliable cell balancing operation.
source: http://www.powerpulse.net/story.php?storyID=31513
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