Tubular light emitting diode lighting device having selectable light output
First Claim
1. A variable output light emitting diode (LED) assembly configured to be powered by a ballast, comprising:
- an alternating current (AC) to direct current (DC) conversion circuit configured to convert the output of the ballast to a selected DC current level;
a plurality of LEDs electrically coupled to the AC to DC conversion circuit and powered by the selected DC current;
a selection circuit coupled to the AC to DC conversion circuit that produces the selected DC current level, and that has a plurality of selection settings, where each selection setting corresponds to a respective one of several DC current levels that can be selected as the selected DC current level; and
a tubular housing that entirely conforms to the shape of a standard fluorescent tube, and which houses the AC to DC conversion circuit, plurality of LEDs, and the selection circuit.
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Accused Products
Abstract
A tubular LED bulb includes a circuit board include an AC to DC conversion circuit that provides an output DC current at one of several selectable levels when provided with an AC power source. The DC current is routed through a plurality of LEDs at the selected DC current level. The AC to DC conversion circuit operates responsive to a selection circuit that allows a user to select a level corresponding to a desired light output level. The AC to DC conversion circuit allows the tubular LED bulb to be mounted in a conventional fluorescent light fixture, including a ballast, without regard to polarity. In some embodiments, the circuit board includes jumper blocks to allow multiple circuit boards to be connected in tandem.
64 Citations
20 Claims
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1. A variable output light emitting diode (LED) assembly configured to be powered by a ballast, comprising:
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an alternating current (AC) to direct current (DC) conversion circuit configured to convert the output of the ballast to a selected DC current level; a plurality of LEDs electrically coupled to the AC to DC conversion circuit and powered by the selected DC current; a selection circuit coupled to the AC to DC conversion circuit that produces the selected DC current level, and that has a plurality of selection settings, where each selection setting corresponds to a respective one of several DC current levels that can be selected as the selected DC current level; and a tubular housing that entirely conforms to the shape of a standard fluorescent tube, and which houses the AC to DC conversion circuit, plurality of LEDs, and the selection circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A tubular light emitting diode (LED) bulb for operation in a standard fluorescent lighting fixture, comprising:
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a first circuit board and a second circuit board connected in tandem with the first circuit board, each of the first and second circuit boards including a plurality of LEDs; a tubular housing in which the first and second circuit boards are disposed; and at least one circuit board including an alternating current (AC) to direct current (DC) conversion circuit configured to convert an AC output of a ballast connected to the standard fluorescent lighting fixture to a selected DC current level, and a selection circuit coupled to the AC to DC conversion circuit having a plurality of selection states, wherein each selection state changes a level of AC provided to the AC to DC conversion circuit from an AC source provided to the tubular LED bulb and in response to output a DC current at the selected level in correspondence with the selection state of the selection circuit; wherein the at least one circuit board is configured to provide the selected DC current to the plurality of LEDs of the at least one circuit board. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A tubular light emitting diode (LED) bulb, comprising:
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a selectable input series capacitance coupled to first and second input electrodes of the tubular LED bulb that is configured to operate as a selectable input impedance to an input alternating current (AC) provided by an AC source to the tubular LED bulb; a selection circuit having a plurality of selection settings where each selection setting selects a different capacitance value of the selectable input series capacitance, wherein each different capacitance value corresponds to a respective one of several AC levels that is output from the selectable input series capacitance to an AC to DC conversion circuit, wherein the AC to DC conversion circuit is configured to output a direct current (DC) level in correspondence to the selected AC level output by the series input capacitance; and a plurality of LEDs that are powered by a DC current at a level corresponding to one of the several DC levels. - View Dependent Claims (20)
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Specification