Method and device for remote sensing and control of LED lights
First Claim
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1. A method for determining a temperature of at least one light emitting diode (LED) in a circuit which includes a power supply for powering the LED, where the LED is operable to generate light, the method comprising:
- providing an operating current and an operating voltage to the LED;
superimposing a first current pulse on the operating current;
sensing a magnitude of a first voltage pulse across the LED resulting from the applied first current pulse superimposed on the operating current;
superimposing at least a second current pulse, different from the first current pulse, on the operating current;
sensing a magnitude of a second voltage pulse across the LED resulting from the applied second current pulse superimposed on the operating current;
deriving an operating temperature curve utilizing (i) logarithms of magnitudes of the first and second current pulses and (ii) magnitudes of the first and second voltage pulses;
determining a slope of the operating temperature curve; and
determining an operating temperature of the LED based on the determined slope of the operating temperature curve.
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Abstract
A control system is disclosed for determining an actual temperature of a light emitting diode. The control system uses conductor that supply power to the light emitting diode to supply a pulse to the light emitting diode. The pulse is determined along with a reaction caused by the pulse and the information gained is used in determination of the light emitting diode die temperature which can then be used in controlling current to the light emitting diode to control the temperature of the light emitting diode.
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Citations
50 Claims
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1. A method for determining a temperature of at least one light emitting diode (LED) in a circuit which includes a power supply for powering the LED, where the LED is operable to generate light, the method comprising:
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providing an operating current and an operating voltage to the LED; superimposing a first current pulse on the operating current; sensing a magnitude of a first voltage pulse across the LED resulting from the applied first current pulse superimposed on the operating current; superimposing at least a second current pulse, different from the first current pulse, on the operating current; sensing a magnitude of a second voltage pulse across the LED resulting from the applied second current pulse superimposed on the operating current; deriving an operating temperature curve utilizing (i) logarithms of magnitudes of the first and second current pulses and (ii) magnitudes of the first and second voltage pulses; determining a slope of the operating temperature curve; and determining an operating temperature of the LED based on the determined slope of the operating temperature curve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A control system for determining a temperature of at least one light emitting diode (LED) receiving an operating current and an operating voltage, the LED being operable at an operating temperature, the control system comprising:
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a power supply for providing the operating current and operating voltage to the LED, the power supply superimposing at least first and second current pulses on the operating current to the LED resulting in, respectively, first and second voltage pulses superimposed on the operating voltage; a voltage sensor for determining magnitudes of the voltage pulses; a current sensor for determining magnitudes of the current pulses; and a controller for (a) deriving an operating temperature curve utilizing (i) logarithms of the magnitudes of the current pulses and (ii) the magnitudes of the voltage pulses, (b) determining a slope of the operating temperature curve, and (c) determining the operating temperature of the LED based on the determined slope of the operating temperature curve. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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Specification