Electric lamp and discharge devices: systems – Current and/or voltage regulation
Reexamination Certificate
2000-06-30
2002-04-09
Wong, Don (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
C315S224000, C315S307000, C313S641000
Reexamination Certificate
active
06369522
ABSTRACT:
FIELD OF INVENTION
The present invention relates to improving the lamp lumen depreciation performance of metal halide HID lamps. More particularly, the invention relates to much improved lamp lumen depreciation performance of Pulse Arc Metal Halide lamps when used with an electronic ballast.
BACKGROUND OF THE INVENTION
There has been an industry wide problem in meeting lamp lumen depreciation (LLD) specifications for metal halide (MH) lamps for some time now. In general, the LLD performance has been lower than rated or desirable, and considerable effort over the last 30 years has been spent on trying to solve this problem. Two independent efforts to solve this problem have involved a new lamp/ballast system called Pulse Arc or Pulse Start and separate work on electronic ballasts to improve the performance of standard MH lamps.
The first effort involves increasing the fill pressure in the arc tube of a MH lamp, using a shaped arc tube and eliminating the starter electrode and associated components (bi-metal switch and resistor). An igniter pulse-forming network is then required to start this new lamp. The system is generally referred to as Pulse Arc or Pulse Start.
The second effort involves the use of a high frequency electronic ballast where the 60 Hz output frequency is replaced with a 90 kHz output frequency with a sine wave of voltage and current. One example of a ballast designed to operate lamps at 90 kHz is a Delta Power ballast (Delta Power Supply, Inc.). We have found through testing that this ballast will generally improve the LLD of standard MH lamps.
It would be desirable to combine the two aforementioned efforts to compound the benefits of both efforts for greater improvements than either effort by itself can provide, however, an impediment to combining the efforts has been that the available high frequency ballasts were not designed to operate Pulse Arc lamps and would not start them.
A desirable aspect of the present invention is that it provides the advantages and compounded benefits of both heretofore uncombined efforts to improve LLD performance of MH lamps. Still a further desirable aspect of the present invention is that it provides the compounded benefits to as wide a range of lamp wattages as possible, thereby simplifying the design of lamp/ballast lighting systems in general.
SUMMARY OF THE INVENTION
In an embodiment of the present invention,. a high frequency 90 kHz electronic ballast is used to provide starting pulses capable of starting Pulse Arc MH and Pulse Start MH lamps. The ballast is further designed to operate the aforementioned lamps at wattages at least as high as 400 watts. The combination of Pulse Arc and Pulse Start MH lamps with a modified 90 Khz electronic ballast provides LLD performance for MH lamps previously unmatched in the industry.
REFERENCES:
patent: 5225742 (1993-07-01), Beasley
patent: 5610447 (1997-03-01), Ivanov et al.
patent: 5773937 (1998-06-01), Miyazaki et al.
patent: 5796216 (1998-08-01), Beasley
patent: 5821696 (1998-10-01), Fromm et al.
patent: 5883475 (1999-03-01), Beasley
patent: 5898273 (1999-04-01), Collins et al.
patent: 5909082 (1999-06-01), Speaker et al.
patent: 5914571 (1999-06-01), Beasley
patent: 5942850 (1999-08-01), Rutan et al.
patent: 5949192 (1999-09-01), Kominami et al.
patent: 5990633 (1999-11-01), Hirshmann et al.
Straight Talk (About HID Lighting), G.E. Lighting Systems, Apr. 1993.
GE HID Lamps, GE Pulse ARC™ Multi-Vapor© Lamps, Apr. 1997.
Starting Mechanisms for HID Lamps, B. R. Collins, May 1994.
Pulse Start of Metal Halide Lamps for Improved Lumen Maintenance (Nortrup et al.—OSRAM SYLVANIA INC. (Paper for 1995 IES Conference). Citations—Nerac—Search Report Jun. 1999.
Specifications—Ultraviolet Radiation Exposure, Osram Sylvania, Oct. 1995.
Pulse Start Metal Halide Systems, 5/97.
Product information bulletin on 400 WATT SUPER METALARC® Pulse Start Metal Halide Lamp, Osram Sylvania, Oct. 1995.
Alemu Ephrem
Fay Sharpe Fagan Minnich & McKee LLP
General Electric Company
Wong Don
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