US4412154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Start up frequency adjustment in an electronic power device for a discharge lamp
Assignee: Compagnie de Signaux et dEntreprises Electriques SA
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Filing: 1981-06-25
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Granted: 1983-10-25
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Expires: 2001-06-25
Abstract
Abstract An electronic drive system for a discharge lamp is disclosed wherein the switching frequency of the chopper is reduced until the lamp striking voltage has reached about 70% of its rated value. The system includes a chopper transistor, a control for varying the transistors duty cycle and a smoothing inductance, freewheeling diode and smoothing inductor to smooth the chopper output. Current limiting is provided to prevent overcurrent within the chopper transistor, smoothing inductor or lamp.
Inventors
- 👤 Denys C. Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:18
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/36; H05B41/38; H05B41/382; H05B41/388; H05B41/26; H05B41/28; H05B41/288; H05B41/2881; H05B41/2882
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
69 words
An electronic power supply device for a discharge lamp including a switching regulator formed by a chopper transistor driven with a variable cyclic ratio through a driver stage, a smoothing inductance, a freewheel diode and a smoothing capacitor, further comprising: means for lowering the switching frequency of the chopper transistor during the heating-up period of the lamp until its striking voltage has reached about 70% of its rated value.
Claim 2
Dependent Claim
69 words
An electronic power supply device for a discharge lamp including a switching regulator formed by a chopper transistor driven with a variable cyclic ratio through a driver stage, a smoothing inductance, a freewheel diode and a smoothing capacitor, further comprising: means for lowering the switching frequency of the chopper transistor during the heating-up period of the lamp until its striking voltage has reached about 70% of its rated value.
Claim 3
Dependent Claim
42 words
The electronic supply device as claimed in claim 1 wherein said means for lowering the frequency comprise an analog gate sensitive to the striking voltage acting on the time constant of an oscillator driving the driver stage through a cyclic ratio modulator.
Claim 4
Dependent Claim
43 words
The electronic power supply device as claimed in claim 1 or 2 further comprising an electronic cut-out switch responsive to the current delivered by the chopper transistor for shunting the driving of the driver stage when this current exceeds a maximum predetermined value.
Claim 5
Dependent Claim
35 words
The electronic supply device as claimed in claim 3 wherein the cut-out switch is formed by a threshold device controlling the conduction of a transistor connected in parallel across the input of the driver stage.
Claim 6
Dependent Claim
65 words
The electronic power supply device, as claimed in claim 1, further comprising a resistor inserted upstream of the regulator so as to limit the surge current during switching on, said resistor being connected in parallel with a thyristor or a triac whose gate is continuously fed from a secondary winding wound on the smoothing inductance, through a rectifier, a smoothing capacitor and a resistive adapter.
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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) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |