US4027199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flash lamp modulator system
Assignee: Xerox Corp
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Filing: 1975-06-11
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Granted: 1977-05-31
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Expires: 1995-06-11
Abstract
Abstract An improved energy conversion apparatus for use in charging energy storage capacitors for energizing flash lamp devices. A transformer has a primary winding coupled to a low voltage DC source and transistor switches and a secondary winding coupled to a chargeable capacitor. The transistor switches are turned on or off in response to current signals in the primary and secondary windings. A detection circuit senses the energy stored in the capacitor and supplies signals to the transistor switches to maintain energy stored in the capacitor at a predetermined level.
Inventors
- 👤 Richard C. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:29
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2007; G03G15/201
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
113 words
An improved energy conversion apparatus comprising: transformer means having a primary winding coupled to a low voltage DC source and switching means, said transformer means having a secondary winding coupled to chargeable capacitor means, said switching means being turned on or off in response to electrical signals in the primary and secondary windings, and detection means for sensing the energy stored in said capacitor means and supplying signals to said switching means to maintain energy stored in said capacitor means at a predetermined level, wherein said primary and secondary windings of said transformer means are phased so that when said primary winding is conducting said secondary winding is not conducting and vice versa.
Claim 2
Dependent Claim
113 words
An improved energy conversion apparatus comprising: transformer means having a primary winding coupled to a low voltage DC source and switching means, said transformer means having a secondary winding coupled to chargeable capacitor means, said switching means being turned on or off in response to electrical signals in the primary and secondary windings, and detection means for sensing the energy stored in said capacitor means and supplying signals to said switching means to maintain energy stored in said capacitor means at a predetermined level, wherein said primary and secondary windings of said transformer means are phased so that when said primary winding is conducting said secondary winding is not conducting and vice versa.
Claim 3
Dependent Claim
28 words
An improved energy conversion apparatus according to claim 1 wherein a short circuit arising in said secondary winding is not operative to cause damage to said switching means.
Claim 4
Dependent Claim
108 words
An improved energy conversion apparatus comprising: transformer means having a primary winding coupled to a low voltage DC source and unidirectional switching means, said transformer means having a secondary winding coupled to chargeable capacitor means, said unidirectional switching means being turned on or off in response to electrical signals in the primary and secondary windings, and detection means for sensing the energy stored in said capacitor means and supplying signals to said unidirectional switching means to maintain energy stored in said capacitor means at a predetermined level by turning said switching means on and off, said detection means includes a current sensing resistor coupled to a comparator amplifier.
Claim 5
Dependent Claim
108 words
An improved energy conversion apparatus comprising: transformer means having a primary winding coupled to a low voltage DC source and unidirectional switching means, said transformer means having a secondary winding coupled to chargeable capacitor means, said unidirectional switching means being turned on or off in response to electrical signals in the primary and secondary windings, and detection means for sensing the energy stored in said capacitor means and supplying signals to said unidirectional switching means to maintain energy stored in said capacitor means at a predetermined level by turning said switching means on and off, said detection means includes a current sensing resistor coupled to a comparator amplifier.
Claim 6
Dependent Claim
23 words
Apparatus according to claim 3 wherein said detection means further includes voltage sensing resistor means for detecting the voltage across said capacitor means.
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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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |