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Power ride-through apps turn to supercapacitors

Posted: 30 Sep 2009     Print Version  Bookmark and Share

Keywords:supercapacitors  applications ride through  energy storage 

Supercapacitors are finding their way into an increasing number of applications for short-term energy storage. One such application is a power ride-through circuit, in which a backup energy source cuts in and powers the load when main power supply fails for a short time. This type of application has been dominated by batteries in the past, but supercapacitors are fast making inroads as their price-per-farad, size and effective series resistance per capacitance (ESR/C) continue to fall.

In a power ride-through application, series-stacked capacitors must be charged and cell voltage balanced. Supercapacitors are switched into the power path when needed, and the power to the load is controlled by a DC/DC converter. Features that make a good choice for power ride-through applications include small package size, programmable charging current, automatic cell voltage balancing, and low drain current on the supercapacitors and a low noise, constant current charger.

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