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US 12,031,689 B2Granted
Tubular device for fitting to a tubular light fitting
AssigneeSignify Holding B.V.
InventorsGaoxian Jin, Zhaoting Li, Haimin Tao, Raimundo De Heer Galisteo
Life of this patent
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Abstract
A lamp comprises an input for connection to a high frequency ballast for gas discharge lamps. A power supply unit obtains power from a LED on voltage of the LED of the lamp, and the power supply unit powers an isolation switch at the input. During a preheat stage of the ballast, the power supply unit does not close the isolation switch, but the isolation switch is closed when the high frequency ballast is in a later state, i.e. the ignition phase.
Claims15
A lamp, comprising:
- an input adapted to be connected to a high frequency ballast for gas discharge lamps;
- a light emitting unit, comprising LEDs, for receiving power from the input and establishing a LED on voltage across the LEDs when the LEDs are on;
- at least one isolation switch coupled between the input and the light emitting unit;
- and
- a power supply unit adapted to obtain power from the established LED on voltage and to use the power for powering the at least one isolation switch to close the switch and thereby electrically connect the input to the light emitting unit,
- wherein the lamp is configured to:
- be unable to establish the LED on voltage sufficient for the power supply unit to close the at least one isolation switch when the high frequency ballast is in a preheat state;
- and
- establish the LED on voltage sufficient for the power supply unit to close the at least one isolation switch when the high frequency ballast is in a later state after the preheat state.
6 more elements
Dependencies are inferred from the claim text.