US4749913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Operating circuit for a direct current discharge lamp
Assignee: General Electric Co
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Filing: 1987-04-17
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Granted: 1988-06-07
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Expires: 2007-04-17
Abstract
Abstract A power supply for a metal halide discharge lamp includes a circuit for applying a high voltage starting pulse to the arc tube of the lamp to initiate the discharge, a glow transition current to provide power transitioning the arc tube from its glow to its run mode, and a run power supply circuit to provide continuous controlled d-c current to the arc tube.
Inventors
- 👤 Karl Stuermer
- 👤 William M. Rucki
- 👤 Spiro Vamvakas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:24
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/36; H05B41/38; H05B41/39; H05B41/392; H05B41/382; H05B41/388; Y; Y02; Y02B; Y02B20/00; Y10; Y10S; Y10S315/00; Y10S315/07
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
123 words
A controlled power supply circuit for supplying d-c power to an arc discharge lamp comprising: means for applying a relatively high voltage d-c potential to the arc discharge lamp for a first predetermined relatively short time interval; means for first supplying a d-c electrical current at a first predetermined current level to said said arc discharge lamp for a second predetermined time interval; and means for supplying a d-c electrical increasing current to said arc discharge lamp until a predetermined high limit is reached, then supplying a d-c electrical decreasing current until a predetermined low limit is reached, and continuing in a cyclic manner said increasing and decreasing d-c current so as to establish an average d-c current to said arc discharge lamp.
Claim 2
Dependent Claim
123 words
A controlled power supply circuit for supplying d-c power to an arc discharge lamp comprising: means for applying a relatively high voltage d-c potential to the arc discharge lamp for a first predetermined relatively short time interval; means for first supplying a d-c electrical current at a first predetermined current level to said said arc discharge lamp for a second predetermined time interval; and means for supplying a d-c electrical increasing current to said arc discharge lamp until a predetermined high limit is reached, then supplying a d-c electrical decreasing current until a predetermined low limit is reached, and continuing in a cyclic manner said increasing and decreasing d-c current so as to establish an average d-c current to said arc discharge lamp.
Claim 3
Dependent Claim
92 words
The controlled power supply circuit according to claim 1 wherein said means for applying a high voltage d-c potential includes a starting circuit comprising: a rectifier adapted to be connected to a source of a-c power and develop a rectifier d-c output signal an autotransformer connected across the output of said rectifier; a switching transistor for controlling the current flow through said autotransformer; current sensing means for detecting the current flow through the arc discharge lamp; and controller means for controlling the duration of on and off states of said switching transistor.
Claim 4
Dependent Claim
99 words
The controlled power circuit according to claim 2 wherein said means for supplying a d-c electrical current at a predetermined first current level comprises: a glow transition timer circuit for receiving said rectified d-c signal and providing in response to said rectified d-c signal a timing control output signal; and a glow power source for receiving said timing control output signal and supplying in response to said timing control output signal a d-c signal of first predetermined voltage and a first predetermined current to said arc discharge lamp for a time period determined by said timing control output signal.
Claim 5
Dependent Claim
121 words
The controlled power circuit according to claim 3 wherein said means for supplying an increasing then decreasing d-c electrical current for the predetermined high and low current limits comprises: a run circuit for receiving said rectified d-c signal; switching means for controlling the current applied to the arc discharge lamp; and comparator means for receiving said timing control output signal of said glow transition timer and providing in response to the difference between said timing control output signal and a signal representative of the current flow in said arc discharge lamp a switching control output signal which is applied to said switching means so as to provide said cyclic control of said increasing and decreasing current to said gas discharge lamp.
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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) | 1991-06-07 | 1991-12-07 | 1992-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-07 | 1995-12-07 | 1996-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-07 | 1999-12-07 | 2000-06-07 | $7700.00 | Window Closed / Lapsed |