Solid state lighting apparatus and circuits including LED segments configured for targeted spectral power distribution and methods of operating the same
First Claim
Patent Images
1. A dimmable solid state lighting apparatus comprising:
- a plurality of light emitting diode (LED) segments including a first LED segment having a targeted minimum Correlated Color Temperature (CCT) value that is less than or equal to respective CCT values of all other LED segments in the plurality of LED segments, and wherein the first LED segment comprises a first forward bias voltage that is less than or equal to forward bias voltages of all other LED segments in the plurality of LED segments;
an LED segment selection circuit configured to selectively control current through the plurality of LED segments to provide an increasing portion of instantaneous power to the first LED segment relative to all the other LED segments while decreasing instantaneous power that is provided to ones of the other LED segments, to shift the light emitted by the apparatus towards the targeted minimum CCT value emitted by the first LED segment while simultaneously decreasing a brightness of light emitted by the apparatus responsive to increased dimming input indicating an increased dimming level of the apparatus so as to shift the light emitted by the apparatus from including the respective CCT values of all of the plurality of LED segments at a reduced level of dimming input to including primarily the targeted minimum CCT value of the first LED segment of the plurality of LED segments at an increased level of dimming input;
a rectified AC voltage signal input to the dimmable solid state lighting apparatus configured to receive a rectified AC voltage signal; and
a voltage controlled current source that is coupled to the rectified AC voltage signal input and to the plurality of LED segments that regulates the current provided to the plurality of LED segments in response to a magnitude of the rectified AC voltage signal.
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Abstract
A dimmable solid state lighting apparatus can include a plurality of light emitting diode (LED) segments including a first LED segment that can have a targeted spectral power distribution for light emitted from the apparatus that is different than spectral power distributions for other LED segments included in the plurality of LED segments. An LED segment selection circuit can be configured to selectively control current through the plurality of LED segments to shift the light emitted by the apparatus to the targeted spectral power distribution responsive to dimming input.
415 Citations
38 Claims
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1. A dimmable solid state lighting apparatus comprising:
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a plurality of light emitting diode (LED) segments including a first LED segment having a targeted minimum Correlated Color Temperature (CCT) value that is less than or equal to respective CCT values of all other LED segments in the plurality of LED segments, and wherein the first LED segment comprises a first forward bias voltage that is less than or equal to forward bias voltages of all other LED segments in the plurality of LED segments; an LED segment selection circuit configured to selectively control current through the plurality of LED segments to provide an increasing portion of instantaneous power to the first LED segment relative to all the other LED segments while decreasing instantaneous power that is provided to ones of the other LED segments, to shift the light emitted by the apparatus towards the targeted minimum CCT value emitted by the first LED segment while simultaneously decreasing a brightness of light emitted by the apparatus responsive to increased dimming input indicating an increased dimming level of the apparatus so as to shift the light emitted by the apparatus from including the respective CCT values of all of the plurality of LED segments at a reduced level of dimming input to including primarily the targeted minimum CCT value of the first LED segment of the plurality of LED segments at an increased level of dimming input; a rectified AC voltage signal input to the dimmable solid state lighting apparatus configured to receive a rectified AC voltage signal; and a voltage controlled current source that is coupled to the rectified AC voltage signal input and to the plurality of LED segments that regulates the current provided to the plurality of LED segments in response to a magnitude of the rectified AC voltage signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A dimmable solid state lighting apparatus comprising:
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a plurality of light emitting diode (LED) segments including a first LED segment having a targeted minimum CCT value for light emitted from the apparatus, the targeted minimum CCT value being less than or equal to respective CCT values for all other LED segments included in the plurality of LED segments; an LED segment selection circuit configured to selectively control current through the plurality of LED segments to shift the light emitted from the apparatus towards the targeted minimum CCT value of the first LED segment while simultaneously decreasing an intensity of light emitted by the apparatus responsive to increased dimming input indicating an increased dimming level of the apparatus; a rectified AC voltage signal input to the dimmable solid state lighting apparatus configured to receive a rectified AC voltage signal; and a voltage controlled current source that is coupled to the rectified AC voltage signal input and to the plurality of LED segments that regulates the current provided to the plurality of LED segments in response to a magnitude of the rectified AC voltage signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A solid state lighting circuit comprising:
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a plurality of light emitting diode (LED) segments including a first LED segment having a minimum Correlated Color Temperature (CCT) value among respective CCT values for the plurality of LED segments; and an LED segment selection circuit configured to selectively control current through the plurality of LED segments to shift the light emitted from the solid state lighting circuit towards the minimum CCT value while simultaneously decreasing an intensity of light emitted from the solid state lighting circuit responsive to a dimming input, the solid state lighting circuit further comprising; a plurality of capacitors, each being electrically connected in parallel with a respective one of the LED segments; a plurality of blocking diodes, each being electrically connected in series between the LED segments; a rectified AC voltage signal input to the solid state lighting circuit configured to receive a rectified AC voltage signal; and a voltage controlled current source that is coupled to the rectified AC voltage signal input and to the plurality of LED segments that regulates the current provided to the plurality of LED segments in response to a magnitude of the rectified AC voltage signal applied to the solid state lighting circuit. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A method of operating a solid state lighting circuit including a plurality of light emitting diode (LED) segments including a targeted LED segment, the method comprising:
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selectively switching current through the targeted LED segment while simultaneously decreasing a combined intensity of light emitted by the plurality of LED segments responsive to dimming input indicating an increased dimming level of the plurality of LED segments so as to shift a light emitted by the apparatus from including all of the plurality of LED segments at a reduced level of dimming input to including primarily the targeted LED segment of the plurality of LED segments at an increased level of dimming input, wherein the targeted LED segment has a targeted minimum CCT value that is less than or equal to respective CCT values for all other LED segments included in the plurality of LED segments, wherein the targeted LED segment has a targeted forward bias voltage that is less than or equal to forward bias voltages of all other LEDs segments in the plurality of LED segments, and wherein selectively switching the current through the targeted LED segment is performed by a voltage controlled current source and is responsive to a magnitude of a rectified AC voltage signal applied to the solid state lighting circuit. - View Dependent Claims (34, 35, 36, 37)
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38. A method of operating a solid state lighting circuit including a plurality of light emitting diode (LED) segments, the method comprising:
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increasingly switching current through a minimum Correlated Color Temperature (CCT) LED segment included in the plurality of LED segments, the minimum CCT LED segment having a minimum CCT value that is less than or equal to respective CCT values for all other LED segments of the plurality of LED segments, while simultaneously decreasing an intensity of light emitted by the plurality of LED segments as dimming increases that shifts the light emitted by the plurality of LED segments towards the minimum CCT value of the minimum CCT LED segment, wherein increasingly switching the current through the minimum CCT LED segment is performed by a voltage controlled current source and is responsive to a magnitude of a rectified AC voltage signal applied to the solid state lighting circuit.
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Specification