LIGHT EMITTING SYSTEM AND POWER CONTROL DEVICE THEREOF
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United States of America Patent
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Issued Date -
Jan 9, 2014
app pub date -
Jan 3, 2013
filing date -
Jul 6, 2012
priority date (Note) -
Abandoned
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Abstract
A light emitting system includes a light emitting device having a forward voltage dependent on an ambient parameter, and a power control device including a current generator, a compensation voltage module, and a control signal generator. The current generator converts a control signal into a driving current for provision to the light emitting device, and provides a feedback voltage. The compensation voltage module obtains a compensation voltage according to the forward voltage, the feedback voltage, and a reference voltage. The control signal generator generates the control signal according to the compensation voltage for provision to the current generator.
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