Portable lighting devices

Patent metadata

Field	Value
Publication number	US-10085322-B2
Application number	US-201715710273-A
Country	US
Kind code	B2
Filing date	Sep 20, 2017
Priority date	Aug 8, 2008
Publication date	Sep 25, 2018
Grant date	Sep 25, 2018

Abstract

A method for increasing battery life in a lighting device powered by a battery source in which an electronic switch is caused to provide a declining power supply to a light emitting diode (“LED”) as a power profile of the battery source declines.

First claim

What is claimed is:

1. A method for increasing battery life in a lighting device powered by a battery source, comprising: causing an electronic switch to provide a declining power supply to a light emitting diode (“LED”) as a power profile of the battery source declines.

2. The method of claim 1 wherein electronics use a power profile for the battery source and a measured battery voltage of the battery source to determine when a duty cycle of the electronic switch is reduced.

3. The method of claim 2 wherein the duty cycle is reduced towards an end of life of the battery source.

4. The method of claim 3 wherein the duty cycle gradually declines when the end of life of the battery source is reached.

5. The method of claim 4 wherein the end of life of the battery source is a low voltage for the measured battery voltage.

6. The method of claim 1 wherein electronics use a power profile for the battery source and a measured battery voltage of the battery source to determine when a duty cycle of the electronic switch is reduced to extend battery life of the battery source.

7. The method of claim 6 wherein the duty cycle is reduced towards an end of life of the battery source.

8. The method of claim 7 wherein the duty cycle gradually declines when the end of life of the battery source is reached.

9. The method of claim 8 wherein the end of life of the battery source is a low voltage for the measured battery voltage.

10. A lighting apparatus with a light emitting diode (LED) light source powered by a battery source through an electrical circuit, comprising:
an electronic switch for providing power to the LED light source; and
electronics for causing the electronic switch to provide a declining power supply to the LED light source as a power profile of the battery source declines.

11. The lighting apparatus of claim 10 wherein the electronics use a power profile for the battery source and a measured battery voltage of the battery source to determine when a duty cycle of the electronic switch is reduced to extend battery life of the battery source.

12. The lighting apparatus of claim 11 wherein the duty cycle is reduced towards an end of life of the battery source.

13. The lighting apparatus of claim 12 wherein the duty cycle gradually declines when the end of life of the battery source is reached.

14. The lighting apparatus of claim 13 wherein the end of life of the battery source is a low voltage for the measured battery voltage.

15. The lighting apparatus of claim 10 wherein the electronics use a power profile for the battery source and a measured battery voltage of the battery source to determine when a duty cycle of the electronic switch is reduced to extend battery life of the battery source.

16. The lighting apparatus of claim 15 wherein the duty cycle is reduced towards an end of life of the battery source.

17. The lighting apparatus of claim 16 wherein the duty cycle gradually declines when the end of life of the battery source is reached.

18. The lighting apparatus of claim 17 wherein the end of life of the battery source is a low voltage for the measured battery voltage.

19. A lighting apparatus, comprising:
a light emitting diode (LED);
a battery source comprising at least one battery;
an electronic switch that supplies power to the LED from the battery source at different duty cycles; and
electronics to extend battery life of the battery source by using a power profile for the battery source to gradually decline the duty cycle of the electronic switch that supplies power to the LED as a battery voltage of the battery source declines.

Assignees

• Mag Instr Inc

Inventors

• Maglica Anthony
• West Stacey

Classifications

• F21V19/047

  by using spare light sources comprised in or attached to the lighting device and being intended to replace a defect light source by manual mounting · CPC title

• F21V23/0428

  the switch being part of, or disposed on the lamp head portion thereof · CPC title

• Y10T29/49828

  Progressively advancing of work assembly station or assembled portion of work · CPC title

• H05B47/16

  by timing means · CPC title

• F21V23/0414

  specially adapted to be used with portable lighting devices · CPC title