US6548963B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit device
Assignee: Koninklijke Philips NV
•
Filing: 2001-08-27
•
Granted: 2003-04-15
•
Expires: 2021-08-27
Abstract
Abstract The invention relates to a circuit for operating a high-pressure discharge lamp, which circuit is provided with means for operating the connected lamp in a dimmed state by means of a dimming signal Ds. The circuit is provided with: input terminals for connecting the circuit to a power supply source, output terminals for connecting the lamp to be operated, a switch-mode power supply (smps) having a converter provided with a semiconductor switch for generating a converter output voltage across buffer capacitor means, and a control circuit for generating a control signal in dependence on the dimming signal Ds for controlling the semiconductor switch. According to the invention, the circuit is further provided with means for generating a converter output voltage-related signal Lvs for monitoring stable lamp operation by limiting the dimmed state by means of the control circuit. In conjunction with the converter output current, continuous lamp power control results in an improvement of the stable lamp operation over the full power range of the lamp.
Inventors
- 👤 Dolf Henricus Jozef Van Casteren
- 👤 Oscar Jan Deurloo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:52
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/36; H05B41/38; H05B41/39; H05B41/392; H05B41/3921
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
124 words
A circuit device for operating a high pressure discharge lamp with successive current phases, said circuit device operates the connected lamp in a dimmed state in accordance with a dimming signal, said circuit device comprising: input terminals for connecting said circuit device to a power supply source; output terminals for connecting said circuit device to the lamp to be operated; a switch-mode power supply with a converter provided with a semiconductor switch for generating, at a converter output, a converter output voltage across a buffer capacitor and a converter output current; a control circuit for generating a control signal in dependence upon the dimming signal for controlling the semiconductor switch; and means for generating a converter output voltage-related signal to form the control signal.
Claim 2
Dependent Claim
124 words
A circuit device for operating a high pressure discharge lamp with successive current phases, said circuit device operates the connected lamp in a dimmed state in accordance with a dimming signal, said circuit device comprising: input terminals for connecting said circuit device to a power supply source; output terminals for connecting said circuit device to the lamp to be operated; a switch-mode power supply with a converter provided with a semiconductor switch for generating, at a converter output, a converter output voltage across a buffer capacitor and a converter output current; a control circuit for generating a control signal in dependence upon the dimming signal for controlling the semiconductor switch; and means for generating a converter output voltage-related signal to form the control signal.
Claim 3
Dependent Claim
25 words
The circuit device as claimed in claim 1 , wherein said control circuit is provided with means for comparing the signal with a limit value.
Claim 4
Dependent Claim
16 words
The circuit device is claimed in claim 1 , wherein said control circuit comprises programmable processor.
Claim 5
Dependent Claim
39 words
The circuit device as claimed in claim 1 , wherein, at the start of each current phase, the converter output voltage is pulse-shaped with a pulse height, and the converter output voltage-related signal serves to detect the pulse height.
Claim 6
Dependent Claim
39 words
The circuit device as claimed in claim 1 , wherein, at the start of each current phase, the converter output voltage is pulse-shaped with a pulse width, and the converter output voltage-related signal serves to detect the pulse width.
Claim 7
Dependent Claim
40 words
The circuit device as claimed in claim 1 , wherein, at the start of each current phase, the converter output voltage is pulse-shaped, followed by a plateau voltage, and the converter output voltage-related signal serves to detect the plateau voltage.
Claim 8
Dependent Claim
26 words
The circuit device as claimed in claim 6 , wherein the converter output voltage-related signal serves to detect the plateau voltage difference in successive current phases.
Claim 9
Dependent Claim
27 words
The circuit device as claimed in claim 6 , wherein the converter output voltage-related signal serves to detect fluctuations in the plateau voltage within a current phase.
Claim 10
Dependent Claim
49 words
The circuit device as claimed in claim 2 , wherein said circuit device can suitably be used to operate a metal halide lamp having a ceramic wall, and in that the limit value for comparing the converter output voltage-related signal corresponds to a crest factor of at most 1.5.
Claim 11
Dependent Claim
50 words
The circuit device as claimed in claim 2 , wherein said circuit device can suitably be used to operate a metal halide lamp having a quartz glass wall, and in that the limit value for comparing the converter output voltage-related signal corresponds to a crest factor of at most 1.6.
Claim 12
Dependent Claim
24 words
The circuit device as claimed in claim 1 , further comprising: means for generating a converter output current-related signal to form the control signal.
Claim 13
Dependent Claim
36 words
The circuit device as claimed in claim 11 , wherein a power signal is formed from the converter output voltage-related signal and the converter output current-related signal, said power signal used to form the control signal.
Claim 14
Dependent Claim
121 words
A circuit device for operating a high pressure discharge lamp with successive current phases and in a dimmed state in accordance with a dimming signal, said circuit device comprises: input terminals for connecting said circuit device to a power supply source; output terminal for connecting said circuit device to the high pressure discharge lamp; a switch-mode power supply between said input terminals and said output terminals, said switch-mode power supply including a buffer capacitor, and a converter for generating a converter output voltage across said buffer capacitor in response to a control signal; a control circuit for generating the control signal in dependence upon the dimming signal and a converter output voltage-related signal; means for generating the converter output voltage-related signal.
Claim 15
Dependent Claim
121 words
A circuit device for operating a high pressure discharge lamp with successive current phases and in a dimmed state in accordance with a dimming signal, said circuit device comprises: input terminals for connecting said circuit device to a power supply source; output terminal for connecting said circuit device to the high pressure discharge lamp; a switch-mode power supply between said input terminals and said output terminals, said switch-mode power supply including a buffer capacitor, and a converter for generating a converter output voltage across said buffer capacitor in response to a control signal; a control circuit for generating the control signal in dependence upon the dimming signal and a converter output voltage-related signal; means for generating the converter output voltage-related signal.
Claim 16
Dependent Claim
26 words
The circuit device of claim 13 , wherein said control circuit compares the converter output voltage-related signals to a limited value when generating the control signal.
Claim 17
Dependent Claim
51 words
The circuit device of claim 13 , wherein the converter output voltage is pulse-shaped with a pulse height at the start of each current phase of the successive current phases; and wherein said control circuit utilizes the converter output voltage-related signal to detect the pulse height of the converter output voltage.
Claim 18
Dependent Claim
51 words
The circuit device of claim 13 , wherein the converter output voltage is pulse-shaped with a pulse width at the start of each current phase of the successive current phases; and wherein said control circuit utilizes the converter output voltage-related signal to detect the pulse width of the converter output voltage.
Claim 19
Dependent Claim
51 words
The circuit device of claim 13 , wherein the converter output voltage is pulse-shaped at the start of each current phase of the successive current phases and a plateau voltage thereafter; and wherein said control circuit utilizes the converter output voltage-related signal to detect the pulse width of the plateau voltage.
Claim 20
Dependent Claim
51 words
The circuit device of claim 13 , wherein the converter output voltage is pulse-shaped at the start of each current phase of the successive current phases and a plateau voltage thereafter; and wherein said control circuit utilizes the converter output voltage-related signal to detect the pulse width of the plateau voltage.
Claim 21
Dependent Claim
42 words
The circuit device of claim 18 , further comprising: means for generating a converter output current-related signal, wherein said control circuit generates the control signal in dependence upon the dimming signal, the converter output voltage-related signal and the converter output current-related signal.
Claim 22
Dependent Claim
48 words
The circuit device of claim 19 , wherein said control circuit generates a power signal as a function of the converter output voltage-related signal and the converter output current-related signal; and wherein said control circuit compares the power signal to a limited value when generating the control signal.
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) | 2006-04-14 | 2006-10-14 | 2007-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-04-14 | 2010-10-14 | 2011-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-04-14 | 2014-10-14 | 2015-04-15 | $7700.00 | Window Closed / Lapsed |