A Novel Linear Circuit For Current Equalization In Led Strings

A Novel Linear Circuit For Current Equalization In Led Strings

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This paper deals with the problem of current sharing in parallel strings of LEDs.As there is no guarantee the gel bottle cashmere that the string voltages are the same, some strategy for equalizing their currents must be used.This ensures that the luminous fluxes emitted by the strings are very similar.

To address this issue it is proposed a small and simple linear topology that can be used on a number of series- associated LEDs, working verona wig as a constant current source for each string.Only four components are used in the arrangement, and a low dependence on transistor parameters is observed, ensuring good current regulation.Mathematical description and an analysis of the stability of the circuit are provided, as well as experimental results.