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.
259 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