Led lighting system
AssigneeSilicon Hill B.V.
InventorsMaarten Willem SEGERS, Shounak ROY, Paul STEFFENS, Toon GROENENDAAL, Jurgen HONOLD
Life of this patent
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Abstract
An LED lamp arrangement adapted for fitting in a luminaire. The luminaire is adapted for a fluorescent lamp and having a ballast. The LED lamp arrangement has a plurality of LEDs, and two or more electrodes for releasably connecting to the luminaire and for conducting current from the ballast for supply to the LEDs The LED lamp arrangement further has a sensor circuit and a protection circuit. The sensor circuit and the protection circuit are adapted to increase the total load impedance of the LED lamp arrangement if the ballast is a constant power electronic ballast.
Claims15
An LED lamp arrangement adapted for fitting in a luminaire, the luminaire adapted for a fluorescent tube and having a ballast, the LED lamp arrangement comprising:
- a plurality of LEDs;
- two or more electrodes for releasably connecting to the luminaire and for receiving a current from a ballast for supply to the plurality of LEDs) in a first operation mode;
- and
- a sensor circuit adapted to measure one or more parameters related to an amount of current received from the ballast in the first operation mode;
- wherein the LED lamp arrangement is arranged to operate in a plurality of operation modes, wherein current from the ballast is conducted through the LEDs in each operation mode;
- wherein the LED lamp arrangement is adapted to automatically switch from the first operation mode to a second operation mode if the measured one or more parameters exceed a threshold which indicates whether the ballast is a constant current ballast or not a constant current ballast;
- and
- wherein, in the first operation mode, the LED lamp arrangement has a lowest load impedance among the plurality of operation modes.
A method for operating an LED lamp arrangement in a plurality of operation modes, the LED lamp arrangement comprising a plurality of LEDs and being fitted in a luminaire, the luminaire being adapted for a fluorescent lamp and having a ballast, the method comprising:
- receiving a current from a ballast;
- conducting the current from the ballast through a plurality of LEDs in a first operation mode;
- measuring one or more parameters related to an amount of current from the ballast in the first operation mode;
- and
- automatically switching from the first operation mode to a second operation mode if the measured one or more parameters exceed a threshold which indicates whether the ballast is a constant current ballast or not a constant current ballast,
- wherein, in the first operation mode, the LED lamp arrangement has a lowest load impedance among the plurality of operation modes.
Dependencies are inferred from the claim text.