Patent US3774074A successfully refreshed from Google Patents.
US3774074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for supplying at least one gas and/or vapour discharge lamp
Assignee: US Philips Corp
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Filing: 1972-07-12
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Granted: 1973-11-20
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Expires: 1992-07-12
Abstract
Abstract The invention relates to an arrangement provided with a dc-ac converter for supplying lamps, in which the converter is controlled by an auxiliary oscillator. According to the invention the waveform of the output voltage of the auxiliary oscillator is adjustable so that an adaptation of the converter to a different lamp load is possible. It has also been described that the auxiliary oscillator is stopped in case of the no-load condition of the converter.
Inventors
- 👤 A Souvay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:05
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/26; H05B41/28; H05B41/282; H05B41/2821; H05B41/2822; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; Y; Y10; Y10S; Y10S315/00; Y10S315/05
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
185 words
An arrangement for supplying at least one gas and/or vapour discharge lamp, particularly a low pressure mercury vapour discharge lamp, comprising: a dc-ac converter, said converter being of the driven type, including a first transistor forming a part of the converter, said transistor having an electrode coupled to a primary winding of a transformer, said lamp being connected to a secondary winding of said transformer, said converter also having an input control circuit; and an auxiliary oscillator for driving said converter, said oscillator including a second transistor and an impedance being connected in series and arranged between two terminals of a d.c. voltage source, the output voltage of said oscillator appearing at the junction of the impedance and second transistor, the junction also being coupled to the input control circuit of said converter, said second transistor also having a variable circuit element for controlling the shape of the output voltage of the oscillator so that a variation of the variable circuit element results in a variation of the output waveform of the oscillator which in turn causes a change in conductive time of the converter.
Claim 2
Dependent Claim
185 words
An arrangement for supplying at least one gas and/or vapour discharge lamp, particularly a low pressure mercury vapour discharge lamp, comprising: a dc-ac converter, said converter being of the driven type, including a first transistor forming a part of the converter, said transistor having an electrode coupled to a primary winding of a transformer, said lamp being connected to a secondary winding of said transformer, said converter also having an input control circuit; and an auxiliary oscillator for driving said converter, said oscillator including a second transistor and an impedance being connected in series and arranged between two terminals of a d.c. voltage source, the output voltage of said oscillator appearing at the junction of the impedance and second transistor, the junction also being coupled to the input control circuit of said converter, said second transistor also having a variable circuit element for controlling the shape of the output voltage of the oscillator so that a variation of the variable circuit element results in a variation of the output waveform of the oscillator which in turn causes a change in conductive time of the converter.
Claim 3
Dependent Claim
34 words
An arrangement as claimed in claim 1 in which the control circuit of the second transistor includes a fixed capacitor, and wherein the variable circuit element in said control circuit is a variable resistor.
Claim 4
Dependent Claim
76 words
An arrangement as claimed in claim 1 in which the transformer of the converter is also provided with a secondary auxiliary winding, characterized in that the secondary auxiliary winding forms part of a series arrangement of a rectifier and a second capacitor, which second capacitor is arranged at one end in series with the input control circuit of the converter and at the other end is connected to the negative terminal of the direct voltage source.
Claim 5
Dependent Claim
76 words
An arrangement as claimed in claim 1 in which a third transistor is also present, the third transistor being between the input control circuit of the converter and the base of the first transistor and this in such a manner that the main electrode circuit of the third transistor is in series with the primary winding of a coupling transformer, the base of the first transistor being connected to the secondary winding of said coupling transformer.
Claim 6
Dependent Claim
32 words
An arrangement as claimed in claim 1 wherein the secondary winding of the transformer whose primary winding is included in the main electrode circuit of the first transistor is provided with taps.
Claim 7
Dependent Claim
141 words
Arrangement as claimed in claim 1 wherein an auxiliary arrangement is present which has a junction connected through a second resistor to the base of the second transistor, which junction is also connected to an RC-circuit whose resistor is connected to one of the terminals of the direct voltage source, and in which said junction is also connected to a circuit section comprising a rectifier and a third capacitor which section is furthermore connected to an electrode of one of the discharge lamps so that in the presence of the lamp load the auxiliary arrangement does not have substantially any influence on the voltage of the base of the second transistor and in the absence of said lamp load the auxiliary arrangement produces a voltage across the base of the second transistor maintaining said transistor permanently in a given conducting state.
Claim 8
Dependent Claim
159 words
An arrangement for supplying at least one gas and/or vapour discharge lamp, particularly a low pressure mercury vapour discharge lamp, comprising: a transformer, having a primary winding and at least one secondary winding adapted to being coupled to at least one lamp; a dc-ac converter having a first transistor adapted to being driven between conduction and nonconduction, the output of said transistor being coupled to a primary of said transformer; an auxiliary oscillator including a second transistor, said second transistor having a phase shift control network connected from said second transistor output to the transistor input, the output of said second transistor being coupled to the input of sAid converter, said control network having a variable resistance element for adjusting the voltage waveform out of said oscillator, said voltage waveform being capable of changing the conduction of said first transistor as said variable resistance is varied, so that a selectable amount of power may be delivered to said lamp.
Claim 9
Dependent Claim
159 words
An arrangement for supplying at least one gas and/or vapour discharge lamp, particularly a low pressure mercury vapour discharge lamp, comprising: a transformer, having a primary winding and at least one secondary winding adapted to being coupled to at least one lamp; a dc-ac converter having a first transistor adapted to being driven between conduction and nonconduction, the output of said transistor being coupled to a primary of said transformer; an auxiliary oscillator including a second transistor, said second transistor having a phase shift control network connected from said second transistor output to the transistor input, the output of said second transistor being coupled to the input of sAid converter, said control network having a variable resistance element for adjusting the voltage waveform out of said oscillator, said voltage waveform being capable of changing the conduction of said first transistor as said variable resistance is varied, so that a selectable amount of power may be delivered to said lamp.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |