Illumination device and method for determining a maximum lumens that can be safely produced by the illumination device to achieve a target chromaticity
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;
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; and
a control circuit configured for determining a maximum lumens value that is safely producible by all LED chains at a predetermined safe temperature to achieve the chromaticity setting without exceeding the maximum safe current level or the maximum safe power level of the power converters at the predetermined safe 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, 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 control circuit may be configured for determining a maximum lumens value that can be safely produced by all LED chains at a predetermined safe temperature to achieve the chromaticity setting without exceeding the maximum safe current level or the maximum safe power level of the power converter(s) at the predetermined safe temperature.
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Citations
19 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; 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; and a control circuit configured for determining a maximum lumens value that is safely producible by all LED chains at a predetermined safe temperature to achieve the chromaticity setting without exceeding the maximum safe current level or the maximum safe power level of the power converters at the predetermined safe temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for adjusting a maximum 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 chromaticity setting set for the illumination device; determining a maximum lumens value that is safely producible by all LED chains at a predetermined safe temperature to achieve the chromaticity setting, so as not to exceed a maximum safe power level or a maximum safe current level associated with the power converters at a predetermined safe temperature; and adjusting the maximum lumens value upon detecting a change in the chromaticity setting. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification