Patent US4728880A successfully refreshed from Google Patents.
US4728880A
Expired / Lapsed
US
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Multiple voltage-pulsed corona charging with a single power supply
Assignee: Eastman Kodak Co
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Filing: 1986-11-28
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Granted: 1988-03-01
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Expires: 2006-11-28
Abstract
Abstract Apparatus is disclosed for driving from a single AC power supply a plurality of corona chargers and includes a substantially constant-potential power supply and a circuit interconnecting said power supply to the plurality of corona chargers such that a substantially constant average current input is delivered to each of the corona chargers. The circuit includes a capacitor associated with each corona charger between the power supply and the corona charger such that the capacitors charge upon transition of the AC power source, and thereupon discharge through the chargers until the corona onset potential is reached. Upon reaching the onset potential, the corona current is quenched. The capacitors are selected such that quenching occurs after the transition within a time interval less than half the period of the AC power supply so that each capacitor regulates the current output of the associated corona charger.
Inventors
- 👤 George R. Walgrove
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:29
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; H; H01; H01T; H01T19/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
49 words
Apparatus for driving from a single power supply a plurality of corona chargers, said apparatus comprising: a substantially constant-potential power supply; and means electrically interconnecting said power supply to the plurality of corona chargers such that a substantially constant average current is delivered to each of the corona chargers.
Claim 2
Dependent Claim
49 words
Apparatus for driving from a single power supply a plurality of corona chargers, said apparatus comprising: a substantially constant-potential power supply; and means electrically interconnecting said power supply to the plurality of corona chargers such that a substantially constant average current is delivered to each of the corona chargers.
Claim 3
Dependent Claim
20 words
Apparatus for driving a plurality of corona chargers as defined in claim 1 wherein said constant-potential power supply is AC.
Claim 4
Dependent Claim
25 words
Apparatus for driving a plurality of corona chargers as defined in claim 1 wherein said constant-potential power supply is AC with a square wave output.
Claim 5
Dependent Claim
24 words
Apparatus for driving a plurality of corona chargers as defined in claim 1 wherein said constant-potential power supply is AC with a trapezoidal output.
Claim 6
Dependent Claim
67 words
Apparatus for driving from a single power supply a plurality of corona chargers, said apparatus comprising: a substantially constant-potential power supply; and means electrically interconnecting said power supply to the plurality of corona chargers such that (1) a substantially constant average current is delivered to each of the corona chargers and (2) at least one of the corona chargers receives an input with only an AC component.
Claim 7
Dependent Claim
67 words
Apparatus for driving from a single power supply a plurality of corona chargers, said apparatus comprising: a substantially constant-potential power supply; and means electrically interconnecting said power supply to the plurality of corona chargers such that (1) a substantially constant average current is delivered to each of the corona chargers and (2) at least one of the corona chargers receives an input with only an AC component.
Claim 8
Dependent Claim
66 words
Apparatus for driving from a single power supply a plurality of corona chargers, said apparatus comprising: a substantially constant-potential power supply; and means electrically interconnecting said power supply to the plurality of corona chargers such that (1) a substantially constant average current is delivered to each of the corona chargers and (2) at least one of the corona charges receives an input with a DC component.
Claim 9
Dependent Claim
66 words
Apparatus for driving from a single power supply a plurality of corona chargers, said apparatus comprising: a substantially constant-potential power supply; and means electrically interconnecting said power supply to the plurality of corona chargers such that (1) a substantially constant average current is delivered to each of the corona chargers and (2) at least one of the corona charges receives an input with a DC component.
Claim 10
Dependent Claim
75 words
Apparatus for driving from a single power supply a plurality of corona chargers, said apparatus comprising: a substantially constant-potential power supply; and means electrically interconnecting said power supply to the plurality of corona chargers such that (1) a substantially constant average current is delivered to each of the corona chargers, (2) at least one of the corona chargers receives a DC input, and (3) at least one of the corona chargers receives an AC input.
Claim 11
Dependent Claim
75 words
Apparatus for driving from a single power supply a plurality of corona chargers, said apparatus comprising: a substantially constant-potential power supply; and means electrically interconnecting said power supply to the plurality of corona chargers such that (1) a substantially constant average current is delivered to each of the corona chargers, (2) at least one of the corona chargers receives a DC input, and (3) at least one of the corona chargers receives an AC input.
Claim 12
Dependent Claim
143 words
Apparatus for driving from a single power supply a plurality of corona chargers having corona onset potentials, said apparatus comprising: a substantially constant-potential AC power supply; and means electrically interconnecting said power supply to the plurality of corona chargers such that a substantially constant average current is delivered to each of the corona chargers, said interconnecting means including a capacitor associated with each corona charger between the power supply and its associated corona charger such that the capacitors charge upon transition of the AC power source and thereupon discharge through the chargers until the corona onset potential is reached, whereupon the corona current is quenched, said capacitors being selected such that quenching occurs after said transition within a time interval less than half the period of the AC power supply so that each capacitor regulates the current output of the associated corona charger.
Claim 13
Dependent Claim
143 words
Apparatus for driving from a single power supply a plurality of corona chargers having corona onset potentials, said apparatus comprising: a substantially constant-potential AC power supply; and means electrically interconnecting said power supply to the plurality of corona chargers such that a substantially constant average current is delivered to each of the corona chargers, said interconnecting means including a capacitor associated with each corona charger between the power supply and its associated corona charger such that the capacitors charge upon transition of the AC power source and thereupon discharge through the chargers until the corona onset potential is reached, whereupon the corona current is quenched, said capacitors being selected such that quenching occurs after said transition within a time interval less than half the period of the AC power supply so that each capacitor regulates the current output of the associated corona charger.
Claim 14
Dependent Claim
44 words
Apparatus for driving a plurality of corona chargers as defined in claim 8 wherein said interconnecting means further comprises variable resistors connecting the corona chargers to ground such that adjustment of the impedance of the resistors changes the current outputs of the corona chargers.
Claim 15
Dependent Claim
29 words
Apparatus for driving a plurality of corona chargers as defined in claim 8 wherein said capacitors are variable, whereby the peak driving voltages for the corona chargers are adjustable.
Claim 16
Dependent Claim
70 words
Apparatus for driving from a single power supply a plurality of corona chargers, and apparatus comprising: a substantially constant-potential AC power supply having half-cycles; and means electrically interconnecting said power supply to the plurality of corona chargers such that said AC power supply delivers current to said corona chargers during one of its half-cycles, and such that the half-cycle current delivered to each of the corona chargers is substantially constant.
Claim 17
Dependent Claim
70 words
Apparatus for driving from a single power supply a plurality of corona chargers, and apparatus comprising: a substantially constant-potential AC power supply having half-cycles; and means electrically interconnecting said power supply to the plurality of corona chargers such that said AC power supply delivers current to said corona chargers during one of its half-cycles, and such that the half-cycle current delivered to each of the corona chargers is substantially constant.
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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) | 1991-03-01 | 1991-08-31 | 1992-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-01 | 1995-08-31 | 1996-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-01 | 1999-08-31 | 2000-03-01 | $7700.00 | Window Closed / Lapsed |