Patent US5075602A successfully refreshed from Google Patents.
US5075602A
Expired / Lapsed
US
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Discharge lamp control circuit arrangement
Assignee: US Philips Corp
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Filing: 1990-11-16
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Granted: 1991-12-24
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Expires: 2010-11-16
Abstract
Abstract The invention relates to a circuit arrangement for operating a discharge lamp, comprising a DC-AC converter provided with switching elements and a drive circuit for rendering the switching elements alternately conducting. The circuit arrangement is furthermore provided with a control circuit C for controlling the power consumed by the lamp. To this end, the control circuit is coupled to a current sensor. According to the invention, the current sensor is so positioned that the power consumed by the lamp can be controlled independently of the build-up of the drive circuit and that a simple construction of the control circuit C is possible.
Inventors
- 👤 Bernardus J. M. Overgoor
- 👤 Adrianus M. J. De Bijl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:59
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/24; H05B41/36; H05B41/38; H05B41/39; H05B41/392; H05B41/26; H05B41/28; H05B41/295; H05B41/298; H05B41/2981; H05B41/2986; Y; Y10; Y10S; Y10S315/00; Y10S315/07
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
161 words
A discharge lamp control circuit arrangement for operating a discharge lamp, comprising a DC-AC converter provided with a circuit A suitable for being connected to a DC voltage source, comprising two switching elements for generating a current with alternating polarity by being alternately conducting and non-conducting with a frequency f, a load circuit B comprising lamp connection terminals, inductive means, and ends which are each connected to a respective main electrode of one of the two switching elements in circuit A, a drive circuit F for generating a drive signal for rendering the switching elements alternately conducting and non conducting with the frequency f, and a current sensor, and a control circuit C coupled to the current sensor and to the drive circuit F for controlling a power consumed by the lamp, characterized in that the current sensor forms part of the load circuit B and the control circuit C is furthermore coupled to the ends of the load circuit B.
Claim 2
Dependent Claim
161 words
A discharge lamp control circuit arrangement for operating a discharge lamp, comprising a DC-AC converter provided with a circuit A suitable for being connected to a DC voltage source, comprising two switching elements for generating a current with alternating polarity by being alternately conducting and non-conducting with a frequency f, a load circuit B comprising lamp connection terminals, inductive means, and ends which are each connected to a respective main electrode of one of the two switching elements in circuit A, a drive circuit F for generating a drive signal for rendering the switching elements alternately conducting and non conducting with the frequency f, and a current sensor, and a control circuit C coupled to the current sensor and to the drive circuit F for controlling a power consumed by the lamp, characterized in that the current sensor forms part of the load circuit B and the control circuit C is furthermore coupled to the ends of the load circuit B.
Claim 3
Dependent Claim
75 words
A circuit arrangement as claimed in claim 1, characterized in that the control circuit C comprises a multiplier circuit for generating a signal Q which is proportional to the product of an instantaneous value of a current through the current sensor and an accompanying instantaneous value of a voltage between the ends of the load circuit B, and a circuit for generating a signal which is proportional to an average value of the signal Q.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-23 | 1995-06-24 | 1995-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-23 | 1999-06-24 | 1999-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-23 | 2003-06-24 | 2003-12-24 | $7700.00 | Window Closed / Lapsed |