Solid State Lighting System, Apparatus and Method with Flicker Removal
First Claim
1. A solid-state lighting apparatus coupleable to an AC input power source having an AC line frequency, the apparatus comprising:
- an AC rectifier to convert an AC voltage level to a rectified voltage level;
a plurality of light emitting diodes coupled in series to form a plurality of segments of light emitting diodes;
a plurality of first switches correspondingly coupled to the plurality of segments of light emitting diodes to switch a selected segment of light emitting diodes into or out of a series light emitting diode current path;
a first terminal controller coupled to the plurality of first switches to control switching of a corresponding segment of light emitting diodes into the series light emitting diode current path;
a second switch coupled in series with each segment of light emitting diodes of the plurality of segments of light emitting diodes to control current through the series light emitting diode current path; and
a second terminal controller coupled to the second switch, the second terminal controller to turn the second switch on and off at a switching frequency at least about four to about one thousand times greater than the AC line frequency and thereby correspondingly turn on and off the plurality of light emitting diodes at the switching frequency.
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Accused Products
Abstract
Exemplary systems, methods and apparatuses for a distributed solid-state lighting system are disclosed. An exemplary apparatus includes a plurality of light emitting diodes; a plurality of first switches to switch a selected segment of light emitting diodes into or out of a series light emitting diode current path; a first terminal controller to control switching of corresponding segments of light emitting diodes into the series light emitting diode current path; a second switch coupled in series with each segment of light emitting diodes; and a second terminal controller to turn the second switch on and off at a frequency generally at least about four to one thousand times the AC line frequency or in response to a random or pseudo-random signal.
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Citations
20 Claims
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1. A solid-state lighting apparatus coupleable to an AC input power source having an AC line frequency, the apparatus comprising:
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an AC rectifier to convert an AC voltage level to a rectified voltage level; a plurality of light emitting diodes coupled in series to form a plurality of segments of light emitting diodes; a plurality of first switches correspondingly coupled to the plurality of segments of light emitting diodes to switch a selected segment of light emitting diodes into or out of a series light emitting diode current path; a first terminal controller coupled to the plurality of first switches to control switching of a corresponding segment of light emitting diodes into the series light emitting diode current path; a second switch coupled in series with each segment of light emitting diodes of the plurality of segments of light emitting diodes to control current through the series light emitting diode current path; and a second terminal controller coupled to the second switch, the second terminal controller to turn the second switch on and off at a switching frequency at least about four to about one thousand times greater than the AC line frequency and thereby correspondingly turn on and off the plurality of light emitting diodes at the switching frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of providing power to a plurality of light emitting diodes couplable to receive a rectified AC voltage, the plurality of light emitting diodes coupled in series to form a plurality of segments of light emitting diodes each comprising at least one light emitting diode, the plurality of segments of light emitting diodes coupled to a plurality of first switches, a second switch coupled in series with each segment of light emitting diodes of the plurality of segments of light emitting diodes, the method comprising:
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using a first terminal controller coupled to the plurality of first switches, switching a selected segment of light emitting diodes into or out of a series light emitting diode current path; and using a second terminal controller coupled to the second switch, turning the second switch on and off at a switching frequency at least about four to about one thousand times greater than the AC line frequency and thereby correspondingly turning on and off the plurality of light emitting diodes at the switching frequency. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A solid-state lighting apparatus coupleable to an AC input power source having an AC line frequency, the apparatus comprising:
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an AC rectifier to convert an AC voltage level to a rectified voltage level; a plurality of light emitting diodes coupled in series to form a plurality of segments of light emitting diodes; a plurality of first switches correspondingly coupled to the plurality of segments of light emitting diodes to switch a selected segment of light emitting diodes into or out of a series light emitting diode current path; a first terminal controller coupled to the plurality of first switches to control switching of a corresponding segment of light emitting diodes into the series light emitting diode current path; a second switch coupled in series with each segment of light emitting diodes of the plurality of segments of light emitting diodes to control current through the series light emitting diode current path; and a second terminal controller coupled to the second switch, the second terminal controller to turn the second switch on and off in response to a random or pseudo-random signal and thereby correspondingly turn on and off the plurality of light emitting diodes at a random or pseudo-random switching frequency which is at least about four to about one thousand times greater than the AC line frequency. - View Dependent Claims (20)
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Specification