US4160202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Analogue automatic voltage controller
Assignee: WLTD Ltd
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Filing: 1977-11-21
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Granted: 1979-07-03
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Expires: 1997-11-21
Abstract
Abstract A control circuit for an electrostatic precipitator, in which an analogue voltage indicative of the desired precipitator electrode potential is stored and periodically increased in the absence of any condition, notably a falling electrode potential, that the desired voltage is excessive in which case the stored potential is reduced.
Inventors
- 👤 Barry K. James
- 👤 David R. Terry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:22
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/66; B03C3/68; Y; Y10; Y10S; Y10S323/00; Y10S323/903
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
112 words
A control circuit for an electrostatic precipitator, comprising an analogue store for providing an output voltage representative of a desired precipitator electrode voltage, switch means for selectively increasing or decreasing the voltage in the analogue store, a switch control circuit connected with the switch means for selecting an increase or a decrease in the stored voltage, and a sensing circuit adapted to be responsive to a falling electrode voltage to provide an output signal for switching said switch control circuit to cause a decrease in the stored voltage, said sensing circuit including a comparator to which are supplied a voltage indicative of the electrode voltage and a delayed sample of that voltage.
Claim 2
Dependent Claim
112 words
A control circuit for an electrostatic precipitator, comprising an analogue store for providing an output voltage representative of a desired precipitator electrode voltage, switch means for selectively increasing or decreasing the voltage in the analogue store, a switch control circuit connected with the switch means for selecting an increase or a decrease in the stored voltage, and a sensing circuit adapted to be responsive to a falling electrode voltage to provide an output signal for switching said switch control circuit to cause a decrease in the stored voltage, said sensing circuit including a comparator to which are supplied a voltage indicative of the electrode voltage and a delayed sample of that voltage.
Claim 3
Dependent Claim
24 words
A control circuit as claimed in claim 1, in which said switch control circuit is also responsive to an indication of excess electrode current.
Claim 4
Dependent Claim
44 words
A control circuit as claimed in claim 1, in which said switch control circuit includes a bistable memory circuit operable to provide an output signal calling for an increase in the stored voltage in the absence of an input signal calling for a decrease.
Claim 5
Dependent Claim
44 words
A control circuit as claimed in claim 2, in which said switch control circuit includes a bistable memory circuit operable to provide an output signal calling for an increase in the stored voltage in the absence of an input signal calling for a decrease.
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) | 1982-07-02 | 1983-01-01 | 1983-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-02 | 1987-01-01 | 1987-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-02 | 1991-01-01 | 1991-07-03 | $7700.00 | Window Closed / Lapsed |