US6011357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Triac dimmable compact fluorescent lamp with low power factor
Assignee: Philips North America LLC
•
Filing: 1997-04-10
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Granted: 2000-01-04
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Expires: 2017-04-10
Abstract
Abstract A triac dimmable compact fluorescent lamp having a low power factor. A power feedback circuit coupled between the input and output stages of the lamp ballast creates sufficient current demand to sustain triac conduction at low dim levels. The power fed back from the output stage to the input stage, which includes a voltage doubler, reflects the voltage across the lamp.
Inventors
- 👤 Pawel M. Gradzki
- 👤 Jerzy Janczak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:54
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/36; H05B41/38; H05B41/39; H05B41/392; H05B41/3921; H05B41/3925; H05B41/26; H05B41/28; H05B41/282; H05B41/285; H05B41/2851; H05B41/2856; H05B41/3924; Y; Y02; Y02B; Y02B20/00; Y10; Y10S; Y10S315/00; Y10S315/04
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
163 words
A ballast for receiving power from a triac dimmer connected to an A.C. source and powering one or more lamps, comprising: an input stage for coupling to the triac dimmer, the triac dimmer including a triac and the A.C. source providing a voltage waveform to the triac dimmer; an output stage coupled to the input stage for supplying power to the one or more lamps; and a feedback circuit coupled between the output stage and the input stage for feeding to the input stage a signal produced by the output stage and representative of the voltage across the one or more lamps, the output stage including a voltage divider network having at least two components forming a junction therebetween, in parallel with the one or more lamps and connected to the feedback circuit at the junctions; whereby the feedback circuit maintains conduction of the triac over an increased portion of the voltage waveform of the A.C. source without substantially fully correcting power factor.
Claim 2
Dependent Claim
163 words
A ballast for receiving power from a triac dimmer connected to an A.C. source and powering one or more lamps, comprising: an input stage for coupling to the triac dimmer, the triac dimmer including a triac and the A.C. source providing a voltage waveform to the triac dimmer; an output stage coupled to the input stage for supplying power to the one or more lamps; and a feedback circuit coupled between the output stage and the input stage for feeding to the input stage a signal produced by the output stage and representative of the voltage across the one or more lamps, the output stage including a voltage divider network having at least two components forming a junction therebetween, in parallel with the one or more lamps and connected to the feedback circuit at the junctions; whereby the feedback circuit maintains conduction of the triac over an increased portion of the voltage waveform of the A.C. source without substantially fully correcting power factor.
Claim 3
Dependent Claim
13 words
The ballast of claim 1, wherein the input stage includes a voltage doubler.
Claim 4
Dependent Claim
20 words
The ballast of claim 1, wherein the input stage includes a rectifier, the feedback circuit being connected to the rectifier.
Claim 5
Dependent Claim
12 words
The ballast of claim 1, wherein the output stage includes an inverter.
Claim 6
Dependent Claim
13 words
The ballast of claim 1, wherein the at least two components are capacitors.
Claim 7
Dependent Claim
23 words
The ballast of claim 1, wherein the output stage includes a resonant tank circuit, formed, in part, from the at least two components.
Claim 8
Dependent Claim
13 words
The ballast of claim 6, wherein the at least two components are capacitors.
Claim 9
Dependent Claim
44 words
The ballast of claim 1, wherein the input stage includes a voltage doubler and a rectifier, the feedback circuit being connected to the rectifier and wherein the output stage includes an inverter and a resonant tank circuit formed from the at least two components.
Claim 10
Dependent Claim
136 words
A ballast for receiving power from a triac dimmer connected to an A.C. source and powering one or more lamps, comprising: an input stage for coupling to the triac dimmer, the triac dimmer including a triac, the A.C. source providing a voltage waveform to the triac dimmer, and the input stage including a voltage doubler; an output stage coupled to the input stage for supplying power to the one or more lamps; and a feedback circuit coupled between the output stage and the input stage for feeding to the input stage a signal produced by the output stage and representative of the voltage across the one or more lamps; whereby the feedback circuit maintains conduction of the triac over an increased portion of the voltage waveform of the A.C. source without substantially fully correcting power factor.
Claim 11
Dependent Claim
136 words
A ballast for receiving power from a triac dimmer connected to an A.C. source and powering one or more lamps, comprising: an input stage for coupling to the triac dimmer, the triac dimmer including a triac, the A.C. source providing a voltage waveform to the triac dimmer, and the input stage including a voltage doubler; an output stage coupled to the input stage for supplying power to the one or more lamps; and a feedback circuit coupled between the output stage and the input stage for feeding to the input stage a signal produced by the output stage and representative of the voltage across the one or more lamps; whereby the feedback circuit maintains conduction of the triac over an increased portion of the voltage waveform of the A.C. source without substantially fully correcting power factor.
Claim 12
Dependent Claim
40 words
The ballast of claim 9, wherein the output stage includes the serial combination of at least two components having a common junction therebetween, in parallel with the one or more lamps and connected to the feedback circuit at the junction.
Claim 13
Dependent Claim
42 words
The ballast of claim 10, wherein the input stage further includes a rectifier which is connected to the feedback circuit and wherein the output stage includes an inverter and a resonant tank circuit formed, in part, from the at least two components.
Claim 14
Dependent Claim
13 words
The ballast of claim 11, wherein the at least two components are capacitors.
Claim 15
Independent Claim
118 words
A method of powering at least one lamp, comprising the steps of: powering an input stage of a ballast with a triac dimmer connected to an A.C. power source; increasing the voltage within the input stage to about twice the peak voltage of the A.C. power source in forming a buffer voltage; applying the buffer voltage to an output stage of the ballast; and feeding a signal produced by the output stage and representative of the voltage across the at least one lamp to the input stage of the ballast to maintain conduction of a triac in the triac dimmer over an increased portion of each cycle of the A.C. power source without substantially fully correcting power factor.
Claim 16
Independent Claim
118 words
A method of powering at least one lamp, comprising the steps of: powering an input stage of a ballast with a triac dimmer connected to an A.C. power source; increasing the voltage within the input stage to about twice the peak voltage of the A.C. power source in forming a buffer voltage; applying the buffer voltage to an output stage of the ballast; and feeding a signal produced by the output stage and representative of the voltage across the at least one lamp to the input stage of the ballast to maintain conduction of a triac in the triac dimmer over an increased portion of each cycle of the A.C. power source without substantially fully correcting power factor.
Claim 17
Dependent Claim
124 words
A ballast for receiving power from a triac dimmer connected to an A.C. source and powering one or more lamps, comprising: an input stage for coupling to the triac dimmer, the triac dimmer including a triac, the A.C. source providing a voltage waveform to the triac dimmer; an output stage coupled to the input stage for supplying power to the one or more lamps; and a feedback circuit coupled between the output stage and the input stage for feeding to the input stage a signal produced by the output stage and representing the voltage across the one or more lamps for maintaining conduction of the triac over an increased portion of the voltage waveform of the A.C. source without substantially fully correcting power factor.
Claim 18
Dependent Claim
124 words
A ballast for receiving power from a triac dimmer connected to an A.C. source and powering one or more lamps, comprising: an input stage for coupling to the triac dimmer, the triac dimmer including a triac, the A.C. source providing a voltage waveform to the triac dimmer; an output stage coupled to the input stage for supplying power to the one or more lamps; and a feedback circuit coupled between the output stage and the input stage for feeding to the input stage a signal produced by the output stage and representing the voltage across the one or more lamps for maintaining conduction of the triac over an increased portion of the voltage waveform of the A.C. source without substantially fully correcting power factor.
Claim 19
Dependent Claim
12 words
A ballast as in claim 14 wherein the power factor remains low.
Claim 20
Dependent Claim
13 words
A ballast as in claim 15 wherein the power factor is about 0.7.
References Cited (Backward Citations)
US4392086A
Cited
US4492897A
Cited
GB2154342A
Cited
US4651060A
Cited
US4704563A
Cited
US4716409A
Cited
US4797599A
Cited
US4866350A
Cited
US4952849A
Cited
JPH03116698A
Cited
US5001386A
Cited
US5001386B1
Cited
EP0471215A1
Cited
US5101142A
Cited
DE9014982U1
Cited
US5313142A
Cited
US5192896A
Cited
US5404082A
Cited
US5608295A
Cited
US5650694A
Cited
US5742134A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-01-03 | 2003-07-05 | 2004-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-01-03 | 2007-07-05 | 2008-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-01-03 | 2011-07-05 | 2012-01-04 | $7700.00 | Window Closed / Lapsed |