Led lamp with dual mode operation
AssigneeEnergy Focus, Inc.
InventorsJohn M. Davenport, David Bina, Jeremiah Heilman
Life of this patent
Estimating the term…
Abstract
An LED lamp has dual modes of operation from fluorescent lamp fixtures. A first circuit powers at least one LED in a first mode of operation when first and second power connector pins at a first end of the lamp are inserted into power receptacles of the fixture that are directly connected to power mains. A second circuit powers at least one LED in a second mode of operation when the second power connector pin at the first end of the lamp and a third power connector pin at a second end of the lamp are inserted into power receptacles of a fixture powered from an electronic ballast. First and second conduction control means permit the second circuit to power at least one LED during the second mode of operation.
Claims10
An LED lamp with dual mode operation from a fluorescent lamp fixture wired to supply either mains power or power from an electronic ballast supplying AC power at a ballast frequency, comprising:
- a) an elongated housing having first and second ends;
- b) a first end of the elongated housing being provided with first and second power connector pins;
- c) a second end of the elongated housing being provided with a third power connector pin;
- d) a first circuit intended to provide primary power to at least one LED that is for being powered in a first mode and that provides light along a length of the elongated housing;
- the first mode occurring when the LED lamp is inserted into a fluorescent lamp fixture having electrical receptacles that receive the first and second power connector pins and that are directly connected to power mains supplying power at a mains frequency much lower than the ballast frequency;
- the first circuit limiting current to the at least one LED for being powered in a first mode;
- e) a second circuit intended to provide primary power to at least one LED that is for being powered in a second mode and that provides light along a length of the elongated housing;
- the second mode occurring when the LED lamp is inserted into a fluorescent lamp fixture having electrical receptacles that receive the second and third power connector pins, at opposite lamp ends, and that are connected to said electronic ballast for receiving power therefrom;
- the second circuit including a rectifier circuit that receives power from the second and third power connector pins;
- f) a first conduction control means serially connected between the second power connector pin and the rectifier circuit for permitting the second circuit to power the at least one LED for being powered in the second mode when the second and third power connector pins, at opposite lamp ends, are connected to said electronic ballast;
- and
- g) a second conduction control means serially connected between the third power connector pin and the rectifier circuit for permitting the second circuit to power the at least one LED for being powered in the second mode when the second and third power connector pins, at opposite lamp ends, are connected to said electronic ballast.
Dependencies are inferred from the claim text.