Current Balancing Circuit For LED Strings

Abstract

A current balancing circuit includes a plurality of LED strings each formed by a series-connection of a plurality of LEDs, a current mirror module including the same number of tri-electrodes elements as that of the LED strings, and a constant-current source providing a constant current for the LED strings. Two electrodes of one of the tri-electrodes elements are short-connected with each other, and the tri-electrodes elements are further connected with one another through one short-connected electrode thereof so as to achieve a mirror effect. The tri-electrodes elements are further one-on-one series-connected with the corresponding LED strings respectively so as to make the LED strings equally distribute the constant current from the constant-current source on the basis of the mirror effect of the current mirror module.

Dependencies are inferred from the claim text.