CIRCUITS AND METHODS FOR DRIVING LIGHT SOURCES
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United States of America Patent
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app pub date -
Nov 27, 2013
filing date -
Mar 14, 2013
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Abandoned
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Abstract
A circuit includes a converter and a controller. The converter includes a switch which is turned on and off alternately according to a driving signal to control a current. The controller generates the driving signal which is a periodic signal having a first state in a first time duration and having a second state in a second time duration and in a third time duration per period of the driving signal. The controller modulates the first time duration and the second time duration to have a change rate, and modulates the third time duration equal to a product of the change rate and a sum of the first time duration and the second time duration, such that a quotient of the first time duration squared and the period of the driving signal is independent of a change of the first time duration, and the current is independent of the change.
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