Illumination device and method for determining a target lumens that can be safely produced by an illumination device at a present temperature
First Claim
1. An illumination device, comprising:
- a plurality of light emitting diode (LED) chains configured to produce illumination for the illumination device at a chromaticity consistent with a chromaticity setting and at a brightness consistent with a brightness setting;
a driver circuit coupled for generating and supplying a respective drive current to each of the plurality of LED chains for producing the illumination;
a plurality of power converters coupled for supplying power to the driver circuit, wherein the power converters each comprise a maximum safe current level or a maximum safe power level, which varies with temperature;
a temperature sensor coupled for measuring a present temperature associated with the power converters; and
a control circuit configured for determining a target lumens value that is safely producible by all LED chains at the present temperature to achieve the chromaticity setting without exceeding the maximum safe current level or the maximum safe power level associated with the power converters at the present temperature.
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Accused Products
Abstract
An illumination device and methods are provided herein for avoiding over-current and over-power conditions in one or more power converters included within the illumination device. The illumination device may generally include a plurality of light emitting diode (LED) chains, a driver circuit, at least one power converter, a temperature sensor and a control circuit. The LED chains may produce illumination for the illumination device at a chromaticity consistent with a chromaticity setting. The power converter(s) may be coupled for powering the LED chains, and may each comprise a maximum safe current level or a maximum safe power level, which varies with temperature. The temperature sensor may be coupled for measuring a present temperature associated with the power converters. The control circuit may be configured for determining a target lumens value that can be safely produced by all LED chains at the present temperature to achieve the chromaticity setting without exceeding the maximum safe current level or the maximum safe power level associated with the power converters at the present temperature.
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Citations
24 Claims
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1. An illumination device, comprising:
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a plurality of light emitting diode (LED) chains configured to produce illumination for the illumination device at a chromaticity consistent with a chromaticity setting and at a brightness consistent with a brightness setting; a driver circuit coupled for generating and supplying a respective drive current to each of the plurality of LED chains for producing the illumination; a plurality of power converters coupled for supplying power to the driver circuit, wherein the power converters each comprise a maximum safe current level or a maximum safe power level, which varies with temperature; a temperature sensor coupled for measuring a present temperature associated with the power converters; and a control circuit configured for determining a target lumens value that is safely producible by all LED chains at the present temperature to achieve the chromaticity setting without exceeding the maximum safe current level or the maximum safe power level associated with the power converters at the present temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for adjusting a target lumens value associated with an illumination device comprising a plurality of light emitting diode (LED) chains and a plurality of power converters configured for powering the LED chains, the method comprising:
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detecting a brightness setting and a chromaticity setting set for the illumination device; measuring a present temperature associated with the power converters of the illumination device; determining a target lumens value that is safely producible by all LED chains at the present temperature to achieve the chromaticity setting without exceeding a maximum safe current level or a maximum safe power level determined for the power converters at the present temperature; and adjusting the target lumens value upon detecting a change in the brightness setting, a change in the chromaticity setting or a change in the present temperature. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification