US 8,796,930 B2Granted

LED device with power removal detection and method for using the same

AssigneeJST Performance, LLC

InventorsStephen Adams, Jim Rhodes

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Abstract

An LED lamp is placed in service on an automotive vehicle to enhance nighttime visual ability or anywhere where increased lighting is needed. The LED lamp utilizes a multi-stage power and control design, where the LED drive current is managed by an LED constant current controller that is coupled to a microprocessor that commands the intensity value of an LED array. The microprocessor manages the light intensity of the LED array using well known pulse-width modulation control methods. The microprocessor measures the voltage of the DC power source and to detect when DC power is removed. Once this detection has occurred, the microprocessor signals the LED current controller to change the current operational mode being delivered to the LED array to the next available operational mode, or alternatively, to the next appropriate operational mode to be used as determined by software stored within the microprocessor.

Claims5

Dependent claims

A method for operating a lamp comprising:

mounting the lamp to an external surface;
applying primary power from an external power source to the lamp;
detecting the application of primary power from the external power source;
performing a first operational mode with the lamp;
changing the first operational mode of the lamp to a second operational mode of the lamp;
and
removing primary power from the lamp, wherein the lamp is an LED array and wherein changing the first operational mode of the lamp to a second operational mode of the lamp includes,
storing a residual amount of power in a temporary power source coupled to the LED array;
removing primary power from the LED array;
selecting the second operational mode from a plurality of available operational modes stored within a memory storage device before power stored in the temporary power source is depleted;
storing the selected second operational mode in the memory storage device before power stored in the temporary power source is depleted;
reapplying primary power to the LED array;
and
performing the selected second operational mode through the LED array.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/227,211Filed 7 Sep 2011
Published: US 2013/0057160 A17 Mar 2013
Granted: 5 Aug 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H05B 45/325
Pulse-control circuits: pulse-width modulation [PWM]
B60Q 1/02
Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor: the devices being primarily…
B60Q 1/26
Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor: the devices being primarily…
H05B 45/10
Circuit arrangements for operating light-emitting diodes [LED]: controlling the intensity of the light