US3659147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric current control apparatus
Assignee: Controlled Environmental Systems Corp
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Filing: 1969-04-22
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Granted: 1972-04-25
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Expires: 1989-04-22
Abstract
Abstract A current control system particularly useful but not limited to high voltage non-linear load devices wherein a vacuum tube, connected in series relationship with the load device and a DC power source, is operated in a controlled electron emission mode. The current through the load may thus be controlled by controlling the current flowing from the anode to the cathode of the vacuum tube.
Inventors
- 👤 Don F Widmayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:05
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/36; H05B41/38; H05B41/39; H05B41/392; H05B41/3921; G; G05; G05F; G05F1/00; G05F1/10; G05F1/46
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
62 words
A current control system comprising a load, means for supplying current to said load, and current control means, comprising a vacuum tube operated in a temperature limited emission mode wherein the current through the tube is independent of the voltage thereacross, connected in series with said load for controlling the current through the load irrespective of the volt-ampere characteristics of the load.
Claim 2
Dependent Claim
62 words
A current control system comprising a load, means for supplying current to said load, and current control means, comprising a vacuum tube operated in a temperature limited emission mode wherein the current through the tube is independent of the voltage thereacross, connected in series with said load for controlling the current through the load irrespective of the volt-ampere characteristics of the load.
Claim 3
Dependent Claim
82 words
A current control system in accordance with claim 1 wherein said means for supplying current to said load comprises a polyphase source of voltage and a number of rectifier bridges individually connected across respective of the phases of said polyphase voltage source, the number of rectifier bridges being equal to the number of phases and the outputs of said rectifier bridges being connected in series with each other and with said load whereby the outputs of the individual rectifying bridges are summed.
Claim 4
Dependent Claim
37 words
A current control system in accordance with claim 1 wherein said current supply means comprises feedback means for supplying current to said vacuum tube in accordance with a sensed quantity related to the output of said tube.
Claim 5
Dependent Claim
58 words
A current control system in accordance with claim 1 wherein said current control means further comprises means including a first diode rectifying bridge for supplying a continuous current to said tube and means including a second diode rectifying bridge for supplying a controlled current to said tube, said first and second bridges including diodes common to both bridges.
Claim 6
Dependent Claim
21 words
A current control system in accordance with claim 1 wherein said vacuum tube comprises a vacuum-type diode including a filamentary element.
Claim 7
Dependent Claim
50 words
A current control system in accordance with claim 5 wherein said current supply means comprises means for supplying a continuous current to said filamentary element and feedback means for supplying a controlled current to said filamentary element in accordance with a sensEd quantity related to the output of said tube.
Claim 8
Dependent Claim
35 words
A current control system in accordance with claim 5 wherein said current supply means comprises said feedback means including a feedback resistor connected in series with said load for sensing the current through said tube.
Claim 9
Dependent Claim
81 words
A current control system in accordance with claim 7 wherein said current supply means includes an electronic means having conducting and non-conducting states and means for controlling the state of said electronic means, said control means including a source of regulated voltage, a further electronic means having conducting and non-conducting states for controlling the state of said first named electronic means, and a potentiometer connected between said source and said further means for variably controlling the state of said further means.
Claim 10
Dependent Claim
37 words
A current control system in accordance with claim 8 wherein said feedback resistor is connected in circuit relationship with said further electronic means for producing an error signal for controlling the state of said further electronic means.
Claim 11
Dependent Claim
36 words
A current control system in accordance with claim 7 wherein said current supply means further comprises a source of D.C. voltage and a germanium transistor connected in series with said D.C. source and said filamentary element.
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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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |