Light tube and power supply circuit
First Claim
1. A replacement light tube for replacing a fluorescent light tube, comprising:
- an elongate tubular housing having a first end and a second end;
a first end cap and a second end cap disposed on the first end and the second end, respectively, each configured to fit with a socket for the fluorescent light tube;
a rigid support structure enclosed within the elongate tubular housing and having a planar portion having a first surface extending within the elongate tubular housing between the first end and the second end, the rigid support structure having spaced-apart sidewalls extending away from the first surface and extending within the elongate tubular housing between the first end and the second end, at least a portion of the sidewalls in contact with an interior surface of the elongate tubular housing;
a plurality of light emitting diodes supported by a second surface of the planar portion opposite to the first surface and between the first end and the second end, the plurality of light emitting diodes arranged to emit light through the elongate tubular housing; and
a power supply circuit including a pulse width modulator and at least two current limiting elements, the at least two current limiting elements configured to receive power from the pulse width modulator and to transmit power to at least some of the plurality of light emitting diodes.
2 Assignments
0 Petitions
Accused Products
Abstract
A replacement light tube for replacing a fluorescent light tube includes an elongate tubular housing having first and second ends, first and second end caps disposed thereon, each configured to fit with a socket for a fluorescent light tube, and a rigid support structure having a planar portion having a first surface extending within the elongate tubular housing between the first and second ends and having spaced-apart sidewalls extending away from the first surface and extending within the housing between the first and second ends. At least a portion of the sidewalls are in contact with an interior surface of housing. A plurality of light emitting diodes are supported only by a second surface of the planar portion opposite to the first surface and between the first and second ends, and are arranged to emit light through the housing.
617 Citations
31 Claims
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1. A replacement light tube for replacing a fluorescent light tube, comprising:
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an elongate tubular housing having a first end and a second end; a first end cap and a second end cap disposed on the first end and the second end, respectively, each configured to fit with a socket for the fluorescent light tube; a rigid support structure enclosed within the elongate tubular housing and having a planar portion having a first surface extending within the elongate tubular housing between the first end and the second end, the rigid support structure having spaced-apart sidewalls extending away from the first surface and extending within the elongate tubular housing between the first end and the second end, at least a portion of the sidewalls in contact with an interior surface of the elongate tubular housing; a plurality of light emitting diodes supported by a second surface of the planar portion opposite to the first surface and between the first end and the second end, the plurality of light emitting diodes arranged to emit light through the elongate tubular housing; and a power supply circuit including a pulse width modulator and at least two current limiting elements, the at least two current limiting elements configured to receive power from the pulse width modulator and to transmit power to at least some of the plurality of light emitting diodes. - 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 replacement light tube for replacing a fluorescent light tube, comprising:
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an elongate tubular housing having a first end and a second end; a first end cap and a second end cap disposed on the first end and the second end, respectively, each configured to fit with a socket for the fluorescent light tube and comprising a respective pair of electrical bi-pin connectors; a rigid support structure enclosed within the elongate tubular housing and having a planar portion having a first surface extending within the elongate tubular housing between the first end and the second end, the rigid support structure having spaced-apart sidewalls extending away from the first surface and extending within the elongate tubular housing between the first end and the second end, at least a portion of the sidewalls in contact with an interior surface of the elongate tubular housing; a plurality of light emitting diodes supported by a second surface of the planar portion opposite to the first surface and between the first end and the second end, the plurality of light emitting diodes arranged to emit light through the elongate tubular housing; and
a power supply circuit including a pulse width modulator and at least two current limiting elements, the at least two current limiting elements configured to receive power from the pulse width modulator and to transmit power to at least some of the plurality of light emitting diodeswherein the support structure divides the elongate tubular housing into a first space in which the plurality of light emitting diodes are housed and a second space defined by the planar portion, the sidewalls and the interior surface of the elongate tubular housing. - View Dependent Claims (19, 20, 21, 22)
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23. A replacement light tube for replacing a fluorescent light tube, comprising:
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an elongate tubular housing having a first end and a second end; a first end cap and a second end cap disposed on the first end and the second end, respectively, each configured to fit with a socket for the fluorescent light tube; a rigid support structure enclosed within the elongate tubular housing and having a planar portion having a first surface extending within the elongate tubular housing between the first end and the second end, the rigid support structure having spaced-apart sidewalls extending away from the first surface and extending within the elongate tubular housing between the first end and the second end, at least a portion of the sidewalls in contact with an interior surface of the elongate tubular housing; a plurality of light emitting diodes supported by the first surface between the first end and the second end, the plurality of light emitting diodes arranged to emit light through the elongate tubular housing; and a power supply circuit including a pulse width modulator and at least two current limiting elements, the at least two current limiting elements configured to receive power from the pulse width modulator and to transmit power to at least some of the plurality of light emitting diodes, the power supply circuit being packaged within at least one of the end caps. - View Dependent Claims (24, 25)
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26. A replacement light tube for replacing a fluorescent light tube, comprising:
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an elongate tubular housing having a first end and a second end; a first end cap and a second end cap disposed on the first end and the second end, respectively, each configured to fit with a socket for the fluorescent light tube; a rigid support structure enclosed within the elongate tubular housing and having a planar portion having a first surface extending within the elongate tubular housing between the first end and the second end, the rigid support structure having spaced-apart sidewalls extending away from the planar portion and extending within the elongate tubular housing between the first end and the second end, at least a portion of the sidewalls in contact with an interior surface of the elongate tubular housing, the planar portion being integral with the sidewalls; a plurality of light emitting diodes supported by the first surface between the first end and the second end, the plurality of light emitting diodes arranged to emit light through the elongate tubular housing; and a power supply circuit including a pulse width modulator and at least two current limiting elements, the at least two current limiting elements configured to receive power from the pulse width modulator and to transmit power to at least some of the plurality of light emitting diodes. - View Dependent Claims (27, 28, 29, 30, 31)
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Specification