PROGRAMMABLE LED DRIVER
First Claim
1. A closed-loop light emitting diode (LED) drive circuit comprising:
- at least one LED;
a voltage source;
a voltage regulator connected to the voltage source to provide a regulated voltage output;
a one-time-programmable voltage source connected to an output of the voltage regulator;
a current controlled drive circuit connected to the one-time-programmable voltage source for providing a drive current to the at least one LED in response to an output from the one-time-programmable voltage source; and
an end of line tester for monitoring the light intensity of the LED device and a signal indicative thereof to said one-time-programmable voltage source, said one-time-programmable voltage source storing said light intensity value and using said light intensity value to control its output voltage to said current control drive circuit.
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Accused Products
Abstract
A closed-loop LED drive circuit includes at least one LED, a voltage source, and a voltage regulator connected to the voltage source to provide a regulated voltage output. A one-time-programmable voltage source is connected to an output of the voltage regulator and a current controlled drive circuit is connected to the one-time-programmable voltage source for providing a drive current to the at least one LED in response to an output from the one-time-programmable voltage source. An end of line tester monitors the light intensity of the LED device and provides a signal indicative thereof to said one-time-programmable voltage source. The one-time-programmable voltage source stores the light intensity value and uses the light intensity value to control its output voltage to the current control drive circuit.
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Citations
15 Claims
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1. A closed-loop light emitting diode (LED) drive circuit comprising:
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at least one LED; a voltage source; a voltage regulator connected to the voltage source to provide a regulated voltage output; a one-time-programmable voltage source connected to an output of the voltage regulator; a current controlled drive circuit connected to the one-time-programmable voltage source for providing a drive current to the at least one LED in response to an output from the one-time-programmable voltage source; and an end of line tester for monitoring the light intensity of the LED device and a signal indicative thereof to said one-time-programmable voltage source, said one-time-programmable voltage source storing said light intensity value and using said light intensity value to control its output voltage to said current control drive circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for calibrating a closed-loop light emitting diode (LED) drive circuit comprising:
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setting a current associated with the closed-loop LED drive circuit to a determined value; measuring a light intensity of an LED associated with the closed-loop LED drive circuit; programming the closed-loop LED drive circuit to the determined value if the measured light intensity is within a target range; and calculating a target current from the determined value and the measured light intensity if the measured light intensity is not within the target range. - View Dependent Claims (12, 13, 14, 15)
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Specification