Light tube and power supply circuit
DCFirst Claim
1. A replacement light tube for replacing a fluorescent light tube, comprising:
- a bulb portion having a first end and a second end;
a first end cap and a second end cap disposed at the first end and the second end, respectively, each configured to fit with a socket for the fluorescent light tube;
a plurality of light emitting diodes disposed inside and extending between the first and second ends of the bulb portion, wherein the plurality of light emitting diodes is arranged to provide light through at least a portion of the bulb portion; and
power supply circuitry configured to receive power from a power source and configured to regulate the intensity of light emitted from the plurality of light emitting diodes by pulse-width modulating the received power.
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Litigations
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Accused Products
Abstract
A replacement light tube for replacing a fluorescent light tube includes a bulb portion having a first end and a second end, a first end cap and a second end cap disposed at the first end and the second end, respectively, each configured to fit with a socket for the fluorescent light tube, a plurality of light emitting diodes disposed inside and extending between the first and second ends of the bulb portion, wherein the plurality of light emitting diodes is arranged to provide light through at least a portion of the bulb portion and power supply circuitry configured to receive power from a power source and configured to regulate the intensity of light emitted from the plurality of light emitting diodes by pulse-width modulating the received power.
606 Citations
30 Claims
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1. A replacement light tube for replacing a fluorescent light tube, comprising:
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a bulb portion having a first end and a second end; a first end cap and a second end cap disposed at the first end and the second end, respectively, each configured to fit with a socket for the fluorescent light tube; a plurality of light emitting diodes disposed inside and extending between the first and second ends of the bulb portion, wherein the plurality of light emitting diodes is arranged to provide light through at least a portion of the bulb portion; and power supply circuitry configured to receive power from a power source and configured to regulate the intensity of light emitted from the plurality of light emitting diodes by pulse-width modulating the received power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A replacement light tube for replacing a fluorescent light tube, comprising:
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a housing having a first end and a second end; a first end cap and a second end cap disposed at the first end and the second end, respectively, each configured to fit with a socket for the fluorescent light tube; a plurality of light emitting diodes disposed inside and extending between the first and second ends of the housing, wherein the plurality of light emitting diodes is arranged to provide light through at least a portion of the housing; and a pulse width modulator configured to receive power from a power source and configured to regulate the intensity of light emitted from the plurality of light emitting diodes by cyclically switching the received power on and off according to a varying duty cycle. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method for operating a replacement light tube for replacing a fluorescent light tube, the replacement light tube including:
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a bulb portion having a first end and a second end; a first end cap and a second end cap disposed at the first end and the second end, respectively, each configured to fit with a socket for the fluorescent light tube; a plurality of light emitting diodes disposed inside and extending between the first and second ends of the bulb portion; and power supply circuitry having a pulse-width modulator, the method comprising; receiving power from a power source; and regulating the intensity of light emitted from the plurality of light emitting diodes, wherein regulating the intensity comprises; cyclically switching, using the pulse-width modulator, the received power on and off according to a varying duty cycle. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A replacement light tube for replacing a fluorescent light tube, comprising:
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a housing having a first end and a second end; a first end cap and a second end cap disposed at the first end and the second end, respectively, each configured to fit with a socket for the fluorescent light tube; a plurality of light emitting diodes disposed inside and extending between the first and second ends of the housing, wherein the plurality of light emitting diodes is arranged to provide light through at least a portion of the housing; and a pulse width modulator configured to regulate the intensity of light emitted from the plurality of light emitting diodes by cyclically switching the received power on and off according to a varying duty cycle and configured to compensate for at least one white light intensity-effecting factor by using the cyclically-switched power. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
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Specification