Patent US6028397A successfully refreshed from Google Patents.
US6028397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Buck converter switching scheme
Assignee: US Philips Corp
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Filing: 1996-10-07
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Granted: 2000-02-22
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Expires: 2016-10-07
Abstract
Abstract A circuit arrangement for igniting and operating a high intensity discharge lamp including a Buck converter. The Buck converter includes a switch, a rectifier and an inductor having primary and secondary windings. The secondary winding is part of an integrator for controlling the non-conductive state of the switch. A detector responsive to the flow of current through the rectifier produces a signal supplied to the integrator output during the non-conductive state of the switch. The integrator output remains proportional to the flow of current through the inductor regardless of the state of the switch. Consequently, the time duration that the switch is in its non-conductive state can be limited while maintaining the circuit arrangement in a reliable non-self oscillatory mode of operation.
Inventors
- 👤 Hendrik J. Blankers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:57
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/26; H05B41/28; H05B41/288; H05B41/2885; H05B41/2886; Y; Y02; Y02B; Y02B20/00; Y10; Y10S; Y10S315/00; Y10S315/07
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
88 words
A circuit arrangement for igniting and operating a high-pressure discharge lamp, comprising: a Buck converter including switching means, inductive means and rectifying means for supplying the lamp with a current through periodic switching of the switching means, the inductive means having a primary winding and a secondary winding; detection means for detecting the flow of current through the rectifying means; and an integration network including the secondary winding of the inductive means and in combination with the detection means for controlling the non-conductive state of the switching means.
Claim 2
Dependent Claim
88 words
A circuit arrangement for igniting and operating a high-pressure discharge lamp, comprising: a Buck converter including switching means, inductive means and rectifying means for supplying the lamp with a current through periodic switching of the switching means, the inductive means having a primary winding and a secondary winding; detection means for detecting the flow of current through the rectifying means; and an integration network including the secondary winding of the inductive means and in combination with the detection means for controlling the non-conductive state of the switching means.
Claim 3
Dependent Claim
31 words
The circuit arrangement as claimed in claim 1, characterized in that the detection means supplies the integration network with a signal during the period in which the switching means is non-conducting.
Claim 4
Dependent Claim
42 words
The circuit arrangement as claimed in claim 1, further including input terminals and output terminals, the detection means being connected between the rectifying means and at least one of the terminals from the group consisting of the input terminals and output terminals.
Claim 5
Dependent Claim
18 words
The circuit arrangement as claimed in claim 1, characterized in that the detection means comprises an ohmic impedance.
Claim 6
Dependent Claim
29 words
The circuit arrangement as claimed in claim 4, wherein the ohmic impedance is shunted by an operational amplifier having an output connected to an output of the integration network.
Claim 7
Dependent Claim
48 words
The circuit arrangement as claimed in claim 2, further including input terminals and output terminals wherein a direct electrical connection is present between one of the input terminals and one of the output terminals, the detection means being connected between the direct electrical connection and the rectifying means.
Claim 8
Dependent Claim
18 words
The circuit arrangement as claimed in claim 2, characterized in that the detection means comprises an ohmic impedance.
Claim 9
Dependent Claim
18 words
The circuit arrangement as claimed in claim 3, characterized in that the detection means comprises an ohmic impedance.
Claim 10
Dependent Claim
35 words
The circuit arrangement as claimed in claim 1, further including a voltage divider for controlling the conductive state of the switching means wherein the secondary winding serves as a voltage source for the voltage divider.
Claim 11
Dependent Claim
35 words
The circuit arrangement as claimed in claim 2, further including a voltage divider for controlling the conductive state of the switching means wherein the secondary winding serves as a voltage source for the voltage divider.
Claim 12
Dependent Claim
35 words
The circuit arrangement as claimed in claim 3, further including a voltage divider for controlling the conductive state of the switching means wherein the secondary winding serves as a voltage source for the voltage divider.
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) | 2003-02-21 | 2003-08-23 | 2004-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-02-21 | 2007-08-23 | 2008-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-02-21 | 2011-08-23 | 2012-02-22 | $7700.00 | Window Closed / Lapsed |