Resonant network for reduction of flicker perception in solid state lighting systems
First Claim
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1. A flicker control circuit for use with solid state lighting, comprising:
- a passive alternating current conditioner circuit that converts an alternating current input signal having a first frequency to an output signal having a second frequency that is greater than the first frequency of the alternating current input signal; and
a passive resonating circuit coupled to the passive alternating current conditioner to multiply the second frequency of the output signal to a multiplied frequency that is sufficiently high that a flicker from a plurality of solid state light sources powered by the output signal is undetectable by an unaided human eye.
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Abstract
An apparatus and method for reducing the perception of flicker of solid state light sources. An alternating current (AC) signal is passed through an AC conditioning circuit and a passive resonating circuit before being supplied to a string of solid state light sources, such as light emitting diodes.
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Citations
34 Claims
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1. A flicker control circuit for use with solid state lighting, comprising:
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a passive alternating current conditioner circuit that converts an alternating current input signal having a first frequency to an output signal having a second frequency that is greater than the first frequency of the alternating current input signal; and a passive resonating circuit coupled to the passive alternating current conditioner to multiply the second frequency of the output signal to a multiplied frequency that is sufficiently high that a flicker from a plurality of solid state light sources powered by the output signal is undetectable by an unaided human eye. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A flicker control circuit for an alternating current lighting system employing solid state light sources, comprising:
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a diode rectifier circuit operable to receive an alternating current signal and provide a rectified current signal to a first node to provide power to a plurality of solid state light sources; and a passive signal conditioning resonant circuit electrically coupled to the first node and operable to increase a frequency of the rectified current signal at the first node to control a detectible flicker from the plurality of solid state light sources while providing a power factor in excess of 0.8. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method of operating a string of a plurality of solid state light sources without an active switch, comprising:
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receiving an alternating current signal at an input terminal; rectifying the alternating current signal with a rectifier bridge and providing a rectified current signal to a first node, the rectified current signal having a frequency that is approximately double a frequency of the alternating current signal; increasing the frequency of the rectified current signal with a resonant network including passive electrical elements to reduce the detectability of amplitude variations in the rectified current signal by an unaided human eye as emitted by the plurality of solid state light sources; and providing the rectified current signal to the string of the plurality of solid state light sources to forward bias the plurality of solid state light sources. - View Dependent Claims (31, 32, 33, 34)
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Specification