US5339008A
Expired / Lapsed
US
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Electromagnetic discharge appartus with dual power amplifiers
Assignee: Osram Sylvania Inc
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Filing: 1993-04-13
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Granted: 1994-08-16
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Expires: 2013-04-13
Abstract
Abstract An electromagnetic discharge apparatus including a solid state supply or lamp ballast for energizing an electrodeless high intensity discharge (HID) lamp in a dual-ended fashion. A low power signal from a high frequency oscillator is split into two separate signals with definite phase relationship which are coupled to separate power amplifiers. In one embodiment, the signal from the high frequency oscillator is mixed with a signal from a modulation oscillator to AM, FM or pulse-width (PWM) modulate the power delivered to the lamp. This technique permits better control over the balance of power delivered to the ends of the lamp.
Inventors
- 👤 Walter P. Lapatovich
- 👤 Scott J. Butler
- 👤 Robert K. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:19
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/24
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
124 words
An electromagnetic discharge apparatus comprising: electrodeless discharge lamp including a discharge vessel having a first end and a second end and containing a fill material which supports electromagnetic discharge; first power amplifier having an input and having an output electromagnetically coupled to said first end of said electrodeless discharge lamp; second power amplifier having an input and having an output electromagnetically coupled to said second end of said electrodeless discharge lamp; power divider having an input and having a first output coupled to said input of said first power amplifier and a second output coupled to said input of said second power amplifier; and high frequency oscillator for providing a low power signal having an output coupled to said input of said power divider.
Claim 2
Dependent Claim
124 words
An electromagnetic discharge apparatus comprising: electrodeless discharge lamp including a discharge vessel having a first end and a second end and containing a fill material which supports electromagnetic discharge; first power amplifier having an input and having an output electromagnetically coupled to said first end of said electrodeless discharge lamp; second power amplifier having an input and having an output electromagnetically coupled to said second end of said electrodeless discharge lamp; power divider having an input and having a first output coupled to said input of said first power amplifier and a second output coupled to said input of said second power amplifier; and high frequency oscillator for providing a low power signal having an output coupled to said input of said power divider.
Claim 3
Dependent Claim
25 words
The electromagnetic discharge apparatus of claim 1 wherein said power divider produces low power signals at said first and second outputs 180° out of phase.
Claim 4
Dependent Claim
46 words
The electromagnetic discharge apparatus of claim 1 further including a pair of AC input terminals and an AC-to-DC converter having an input coupled to said AC input terminals and having a DC output coupled to said high frequency oscillator and said first and second power amplifiers.
Claim 5
Dependent Claim
46 words
The electromagnetic discharge apparatus of claim 1 further including a pair of DC input terminals and a DC-to-DC converter having an input coupled to said DC input terminals and having a DC output coupled to said high frequency oscillator and said first and second power amplifiers.
Claim 6
Dependent Claim
169 words
An electromagnetic discharge apparatus comprising: electrodeless discharge lamp including a discharge vessel having a first end and a second end and containing a fill material which supports electromagnetic discharge; first power amplifier having an input and having an output electromagnetically coupled to said first end of said electrodeless discharge lamp; second power amplifier having an input and having an output electromagnetically coupled to said second end of said electrodeless discharge lamp; power divider having an input and having a first output coupled to said input of said first power amplifier and a second output coupled to said input of said second power amplifier; mixer for modulating a carrier signal having an output coupled to said input of said power divider and having a first input and a second input; modulation oscillator for providing a modulation signal having an output coupled to said first input of said mixer; and high frequency oscillator for providing a low power carrier signal having an output coupled to said second input of said mixer.
Claim 7
Dependent Claim
169 words
An electromagnetic discharge apparatus comprising: electrodeless discharge lamp including a discharge vessel having a first end and a second end and containing a fill material which supports electromagnetic discharge; first power amplifier having an input and having an output electromagnetically coupled to said first end of said electrodeless discharge lamp; second power amplifier having an input and having an output electromagnetically coupled to said second end of said electrodeless discharge lamp; power divider having an input and having a first output coupled to said input of said first power amplifier and a second output coupled to said input of said second power amplifier; mixer for modulating a carrier signal having an output coupled to said input of said power divider and having a first input and a second input; modulation oscillator for providing a modulation signal having an output coupled to said first input of said mixer; and high frequency oscillator for providing a low power carrier signal having an output coupled to said second input of said mixer.
Claim 8
Dependent Claim
25 words
The electromagnetic discharge apparatus of claim 5 wherein said power divider produces low power signals at said first and second outputs 180° out of phase.
Claim 9
Dependent Claim
28 words
The electromagnetic discharge apparatus of claim 5 wherein said mixer amplitude modulates, frequency modulates or pulse width modulates said low power carrier signal from said high frequency oscillator.
Claim 10
Dependent Claim
46 words
The electromagnetic discharge apparatus of claim 5 further including a pair of AC input terminals and an AC-to-DC converter having an input coupled to said AC input terminals and having a DC output coupled to said high frequency oscillator and said first and second power amplifiers.
Claim 11
Dependent Claim
46 words
The electromagnetic discharge apparatus of claim 5 further including a pair of DC input terminals and a DC-to-DC converter having an input coupled to said DC input terminals and having a DC output coupled to said high frequency oscillator and said first and second power amplifiers.
Claim 12
Dependent Claim
141 words
An electromagnetic discharge apparatus comprising: electrodeless discharge lamp including a discharge vessel having a first end and a second end and containing a fill material which supports electromagnetic discharge; first power amplifier having an input and having an output electromagnetically coupled to said first end of said electrodeless discharge lamp; phase shifter having an input and having an output coupled to said input of said first power amplifier; second power amplifier having an input and having an output electromagnetically coupled to said second end of said electrodeless discharge lamp; power divider having an input and having a first output coupled to said input of said phase shifter and a second output coupled to said input of said second power amplifier; and high frequency oscillator for providing a low power signal having an output coupled to said input of said power divider.
Claim 13
Dependent Claim
141 words
An electromagnetic discharge apparatus comprising: electrodeless discharge lamp including a discharge vessel having a first end and a second end and containing a fill material which supports electromagnetic discharge; first power amplifier having an input and having an output electromagnetically coupled to said first end of said electrodeless discharge lamp; phase shifter having an input and having an output coupled to said input of said first power amplifier; second power amplifier having an input and having an output electromagnetically coupled to said second end of said electrodeless discharge lamp; power divider having an input and having a first output coupled to said input of said phase shifter and a second output coupled to said input of said second power amplifier; and high frequency oscillator for providing a low power signal having an output coupled to said input of said power divider.
Claim 14
Dependent Claim
13 words
The electromagnetic discharge apparatus of claim 10 wherein said phase shifter is variable.
Claim 15
Dependent Claim
25 words
The electromagnetic discharge apparatus of claim 10 wherein said power divider produces low power signals at said first and second outputs 180° out of phase.
Claim 16
Dependent Claim
46 words
The electromagnetic discharge apparatus of claim 10 further including a pair of AC input terminals and an AC-to-DC converter having an input coupled to said AC input terminals and having a DC output coupled to said high frequency oscillator and said first and second power amplifiers.
Claim 17
Dependent Claim
46 words
The electromagnetic discharge apparatus of claim 10 further including a pair of DC input terminals and a DC-to-DC converter having an input coupled to said DC input terminals and having a DC output coupled to said high frequency oscillator and said first and second power amplifiers.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-08-15 | 1998-02-14 | 1998-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-15 | 2002-02-14 | 2002-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-15 | 2006-02-14 | 2006-08-16 | $7700.00 | Window Closed / Lapsed |