Patent US2918557A successfully refreshed from Google Patents.
Patent US4612478A successfully refreshed from Google Patents.
US4612478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dimmer circuit for high intensity discharge lamp
Assignee: Individual
•
Filing: 1984-12-19
•
Granted: 1986-09-16
•
Expires: 2004-12-19
Abstract
Abstract A lamp dimmer circuit for a high intensity discharge lamp includes an auto transformer, a power factor correction capacitor, a reactor ballast, a solid state phase control current module, a dimming control, a high frequency power supply, a coupling transformer, a high frequency by pass capacitor and a lamp. The high frequency low current source formed by the high frequency by pass capacitor, coupling transformer and high frequency power supply act to maintain the lamp arc even with variations in line voltage.
Inventors
- 👤 Stephen C. Payne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:23
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/36; H05B41/38; Y; Y10; Y10S; Y10S315/00; Y10S315/04; Y10S315/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
In a dimmer circuit for a high intensity discharge lamp, having an autotransformer receptive of line voltage, a power factor correction capacitor disposed across the output of the auto transformer, a reactor ballast in series with the lamp to be dimmed and a solid state phase control circuit connected in series with a lamp to be dimmed, the improvement comprising means for maintaining a lamp arc in the lamp to be dimmed including a high frequency bypass capacitor disposed in parallel with the lamp to be dimmed, a high frequency coupling transformer in series with the lamp to be dimmed and means for applying high frequency power to the input of the high frequency coupling transformer.
Claim 2
Dependent Claim
116 words
In a dimmer circuit for a high intensity discharge lamp, having an autotransformer receptive of line voltage, a power factor correction capacitor disposed across the output of the auto transformer, a reactor ballast in series with the lamp to be dimmed and a solid state phase control circuit connected in series with a lamp to be dimmed, the improvement comprising means for maintaining a lamp arc in the lamp to be dimmed including a high frequency bypass capacitor disposed in parallel with the lamp to be dimmed, a high frequency coupling transformer in series with the lamp to be dimmed and means for applying high frequency power to the input of the high frequency coupling transformer.
References Cited (Backward Citations)
US2975331A
Cited
US3323015A
Cited
US3309567A
Cited
US4362971A
Cited
US4376911A
Cited
US4410837A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-15 | 1990-03-17 | 1990-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-15 | 1994-03-17 | 1994-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-15 | 1998-03-17 | 1998-09-16 | $7700.00 | Window Closed / Lapsed |