LED current balance driving circuit
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United States of America Patent
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May 12, 2015
Grant Date -
May 30, 2013
app pub date -
Jul 20, 2012
filing date -
Nov 28, 2011
priority date (Note) -
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Abstract
A LED current-balance driving circuit having a current-balance coil set, a switching unit, and a control circuit is provided. The current-balance coil set has at least a first coil and a second coil, both of which are in connection with respective LED strings, for balancing currents flowing through the LED strings. The switching unit and a leakage inductance of current-balance coil set are utilized to facilitate the voltage conversion for driving the LED strings. A duty cycle of the switching unit is controlled by the control circuit according to the currents flowing through the LED strings.
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