Led lighting device and a method for controlling the same
First Claim
1. A lighting device, comprising:
- a temperature-current converter which generates a current command value based on temperature information indicating a temperature of a light source; and
a light source driver which receives the current command value, adjusts an amplitude of a pulse width modulation (PWM) signal, and controls a driving electric current of the light source according to the adjusted PWM signal,wherein the temperature-current converter generates the current command value using a function indicating a correlation between the temperature of the light source and the current command value.
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Accused Products
Abstract
A Light Emitting Diode (LED) lighting device capable of correcting changes in a wavelength of light output from an LED element caused by changes in temperature, and a method for controlling the same are provided. The lighting device includes a temperature-current converter which generates a current command value to correct change in a wavelength of output light based on temperature information indicating temperature of the light source, and a light source driver which receives the current command value, adjusts amplitude of a pulse width modulation (PWM) signal, and controls a driving electric current of the light source according to the adjusted PWM signal.
62 Citations
23 Claims
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1. A lighting device, comprising:
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a temperature-current converter which generates a current command value based on temperature information indicating a temperature of a light source; and a light source driver which receives the current command value, adjusts an amplitude of a pulse width modulation (PWM) signal, and controls a driving electric current of the light source according to the adjusted PWM signal, wherein the temperature-current converter generates the current command value using a function indicating a correlation between the temperature of the light source and the current command value. - View Dependent Claims (2, 3, 6, 7, 8, 9, 19, 20, 21)
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4. A lighting device, comprising:
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a temperature-current converter which generates a current command value based on temperature information indicating a temperature of a light source; and a light source driver which receives the current command value, adjusts an amplitude of a pulse width modulation (PWM) signal, and controls a driving electric current of the light source according to the adjusted PWM signal. wherein the temperature-current converter comprises a lookup table which stores current command values corresponding to temperatures of the light source, said temperature-current converter reads a current command value from the lookup table and outputs the read current command value to an Light Emitted Diode (LED) driver.
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5. (canceled)
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10. A method for controlling a lighting device, comprising:
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generating a current command value based on temperature information indicating a temperature of a light source; adjusting an amplitude of a pulse width modulation (PWM) signal according to the current command value; and supplying an electric current to the light source according to the adjusted PWM signals, and generating the current command value using a function indicating a correlation between the temperature of the light source and the current command value. - View Dependent Claims (12, 15, 16, 17, 18)
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11. The method for controlling a lighting device, wherein the current command value is generated to correct for changes in a wavelength of output light caused by a temperature change of the light source.
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13-14. -14. (canceled)
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22. A lighting device, comprising:
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a temperature-current converter which generates a current command value based on temperature information indicating a temperature of a light source; and a light source driver which receives the current command value, adjusts an amplitude of a pulse width modulation (PWM) signal, and controls a driving electric current of the light source according to the adjusted PWM signal, wherein said current command values are generated based on a relational expression between the electric current and a wavelength of the light source and a relational expression between the temperature and the wavelength of the light source.
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23. A method for controlling a lighting device, comprising:
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generating a current command value based on temperature information indicating a temperature of a light source; adjusting an amplitude of a pulse width modulation (PWM) signal according to the current command value; supplying an electric current to the light source according to the adjusted PWM signal, and wherein said current command values are generated based on a relational expression between the electric current and a wavelength of the light source and a relational expression between the temperature and the wavelength of the light source.
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Specification