LED lighting device and method for controlling the same based on temperature changes
First Claim
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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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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.
41 Citations
21 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, 4, 5, 6, 7, 8, 9, 10, 11)
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12. 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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13. 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 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 (14, 15, 16, 17, 18, 19)
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20. 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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21. 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