US3873282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic voltage control for an electronic precipitator
Assignee: General Electric Co
•
Filing: 1973-11-09
•
Granted: 1975-03-25
•
Expires: 1993-11-09
Abstract
Abstract In a system for automatically controlling the voltage applied to an electronic precipitator there is included a lockout circuit for inhibiting gate pulses to controllable switch means during sparking states of the precipitator, and a delay circuit for blocking gating pulses to the controllable switch for a period of time after the precipitator has sparked. The system further includes a current limiting reactor for use in limiting current flow through the controllable switch which reactor comprises a plurality of series-connected solenoids each having single-layer windings including spaced-apart turns and a combination air-iron core magnetic path where the air section of the magnetic path is greater than that of the iron core section.
Inventors
- 👤 David C Finch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:24
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/66; B03C3/68; Y; Y10; Y10S; Y10S323/00; Y10S323/903
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
137 words
A system for automatically controlling the voltage applied to an electronic precipitator having alternating conducting and nonconducting states, said system comprising: a. controllable switch means; b. means for coupling an AC voltage to said controllable switch means; c. a control circuit including gating means responsive to the nonconducting state of said electronic precipitator to selectively provide a gating signal to said controllable switch means during said nonconducting state of said electronic precipitator; d. said controllable switch means being responsive to said gating signal to control the application of said AC voltage to said electronic precipitator; and e. said control circuit further including means responsive to the conducting state of said electronic precipitator for varying the relationship between said AC voltage and said gating signal as a function of the time duration and intensity of said conducting state.
Claim 2
Independent Claim
137 words
A system for automatically controlling the voltage applied to an electronic precipitator having alternating conducting and nonconducting states, said system comprising: a. controllable switch means; b. means for coupling an AC voltage to said controllable switch means; c. a control circuit including gating means responsive to the nonconducting state of said electronic precipitator to selectively provide a gating signal to said controllable switch means during said nonconducting state of said electronic precipitator; d. said controllable switch means being responsive to said gating signal to control the application of said AC voltage to said electronic precipitator; and e. said control circuit further including means responsive to the conducting state of said electronic precipitator for varying the relationship between said AC voltage and said gating signal as a function of the time duration and intensity of said conducting state.
Claim 3
Dependent Claim
108 words
The system for automatically controlling a voltage applied to an electronic precipitator as recited in claim 1, wherein said gating means includes means for generating a control signal responsive to said conducting and nonconducting states of said electronic precipitator, said control signal increasing in a first direction when said precipitator is in a nonconducting state, and said control signal increasing in an opposite direction from said first direction when said precipitator is in a conducting state; said gating means being responsive to said control signal increasing in said first direction to provide said gating signal at a progressively decreasing phase retard angle with respect to said AC voltage.
Claim 4
Dependent Claim
71 words
A system as recited in claim 1 and including a current limiting reactor coupled in circuit with said controllable switch means including an inductive element having a single-layer winding with a plurality of electrical turns spaced apart from each other; said inductive element having a magnetic path which includes an air section and an iron section, the length of said air section being greater than the length of said iron section.
Claim 5
Independent Claim
163 words
A system for automatically controlling the voltage applied to an electronic precipitator having alternating conducting and nonconducting states, said system comprising: a. controllable switch means; b. means for coupling an AC voltage to said controllable switch means; c. a control circuit including gating means responsive to the nonconducting state of said electronic precipitator to provide a gating signal having a progressively changing phase relationship to said AC voltage to said controllable switch means during said nonconducting state of said electronic precipitator; d. said controllable switch means being responsive to said gating signal to control the application of said voltage to said electronic precipitator; and e. said control circuit further including means responsive to the conducting state of said electronic precipitator to reinstitute said gating signal upon termination of said conducting state, said reinstituted gating signal having a phase relationship to the AC voltage which differs from said relationship of the previous gating signal as a function of the duration of said conducting state.
Claim 6
Independent Claim
163 words
A system for automatically controlling the voltage applied to an electronic precipitator having alternating conducting and nonconducting states, said system comprising: a. controllable switch means; b. means for coupling an AC voltage to said controllable switch means; c. a control circuit including gating means responsive to the nonconducting state of said electronic precipitator to provide a gating signal having a progressively changing phase relationship to said AC voltage to said controllable switch means during said nonconducting state of said electronic precipitator; d. said controllable switch means being responsive to said gating signal to control the application of said voltage to said electronic precipitator; and e. said control circuit further including means responsive to the conducting state of said electronic precipitator to reinstitute said gating signal upon termination of said conducting state, said reinstituted gating signal having a phase relationship to the AC voltage which differs from said relationship of the previous gating signal as a function of the duration of said conducting state.
Claim 7
Dependent Claim
41 words
A system as recited in claim 4 and including a current limiting reactor coupled in circuit with said controllable switch means and including an inductive element having a single-layer winding with a plurality of electrical turns spaced apart from each other.
Claim 8
Independent Claim
198 words
A system for automatically contRolling the voltage applied to an electronic precipitator having alternating conducting and nonconducting states, said system comprising: a. controllable switch means; b. means for coupling an AC voltage to said controllable switch means; c. a control circuit including gating means responsive to the nonconducting state of said electronic precipitator to provide a gating signal having a progressively changing phase relationship to said AC voltage to said controllable switch means during said nonconducting state of said electronic precipitator to provide a gating signal having a progressively changing phase relationship to said AC voltage to said controllable switch means during said monconducting state of said electronic precipitator; d. said controllable switch means responsive to said gating means to control the application of said voltage to said electronic precipitator; e. said control circuit further including means responsive to the conducting state of said electronic precipitator for varying the relationship between said AC voltage and said gating signal as a function of the time duration and intensity of said conducting state; and f. lockout means responsive to said conducting state of said electronic precipitator to inhibit said gating signal to said controllable switch means during said conducting state.
Claim 9
Independent Claim
198 words
A system for automatically contRolling the voltage applied to an electronic precipitator having alternating conducting and nonconducting states, said system comprising: a. controllable switch means; b. means for coupling an AC voltage to said controllable switch means; c. a control circuit including gating means responsive to the nonconducting state of said electronic precipitator to provide a gating signal having a progressively changing phase relationship to said AC voltage to said controllable switch means during said nonconducting state of said electronic precipitator to provide a gating signal having a progressively changing phase relationship to said AC voltage to said controllable switch means during said monconducting state of said electronic precipitator; d. said controllable switch means responsive to said gating means to control the application of said voltage to said electronic precipitator; e. said control circuit further including means responsive to the conducting state of said electronic precipitator for varying the relationship between said AC voltage and said gating signal as a function of the time duration and intensity of said conducting state; and f. lockout means responsive to said conducting state of said electronic precipitator to inhibit said gating signal to said controllable switch means during said conducting state.
Claim 10
Dependent Claim
24 words
the system for automatically controlling a voltage applied to an electronic precipitator as recited in claim 3 wherein said lockout means includes switch means.
Claim 11
Dependent Claim
50 words
A system as recited in claim 6 and including a current limiting reactor coupled in circuit with said controllable switch means and having a magnetic path which includes an air section and an iron section, the length of said air section being greater than the length of said iron section.
Claim 12
Independent Claim
162 words
A system for automatically controlling the voltage applied to an electronic precipitator having alternating conducting and nonconducting states, said system comprising: a. controllable switch means; b. means for coupling an AC voltage to said controllable switch means; c. a control circuit including gating means responsive to the nonconducting state of said electronic precipitator to provide a gating signal having a progressively changing phase relationship to said AC voltage to said controllable switch means during said nonconducting state of said electronic precipitator; d. said controllable switch means responsive to said gating means to control the application of said voltage to said electronic precipitator; and e. said control circuit further including means responsive to the conducting state of said electronic precipitator to reinstitute said gating signal upon termination of said conducting state, said reinstituted gating signal having a phase relationship to the AC voltage which differs from said relationship of the previous gating signal as a function of the duration of the conducting state.
Claim 13
Independent Claim
162 words
A system for automatically controlling the voltage applied to an electronic precipitator having alternating conducting and nonconducting states, said system comprising: a. controllable switch means; b. means for coupling an AC voltage to said controllable switch means; c. a control circuit including gating means responsive to the nonconducting state of said electronic precipitator to provide a gating signal having a progressively changing phase relationship to said AC voltage to said controllable switch means during said nonconducting state of said electronic precipitator; d. said controllable switch means responsive to said gating means to control the application of said voltage to said electronic precipitator; and e. said control circuit further including means responsive to the conducting state of said electronic precipitator to reinstitute said gating signal upon termination of said conducting state, said reinstituted gating signal having a phase relationship to the AC voltage which differs from said relationship of the previous gating signal as a function of the duration of the conducting state.
Claim 14
Independent Claim
161 words
A system for automatically controlling a voltage applied to an electronic precipitator having alternating conducting and nonconducting states, said system comprising: a. controllable switch means; b. means for applying an alternating voltage to said controllable switch means; c. a control circuit including gating means responsive to the nonconducting state of said electronic precipitator for providing a gating signal at a progressively changing phase retard angle to said controllable switch means during said nonconducting state of said electronic precipitator; d. said controllable switch means responsive to said gating means to control the application of said voltage to said electronic precipitator; and e. said gating means including time delay means responsive to said conducting state of said electronic precipitator to delay said gating signal to said controllable switch means for a variable period of time which varies as a function of the time duration of said conducting state following an alternation of said eleCtronic precipitator from a conducting state to a nonconducting state.
Claim 15
Independent Claim
161 words
A system for automatically controlling a voltage applied to an electronic precipitator having alternating conducting and nonconducting states, said system comprising: a. controllable switch means; b. means for applying an alternating voltage to said controllable switch means; c. a control circuit including gating means responsive to the nonconducting state of said electronic precipitator for providing a gating signal at a progressively changing phase retard angle to said controllable switch means during said nonconducting state of said electronic precipitator; d. said controllable switch means responsive to said gating means to control the application of said voltage to said electronic precipitator; and e. said gating means including time delay means responsive to said conducting state of said electronic precipitator to delay said gating signal to said controllable switch means for a variable period of time which varies as a function of the time duration of said conducting state following an alternation of said eleCtronic precipitator from a conducting state to a nonconducting state.
Claim 16
Dependent Claim
24 words
The system for automatically controlling a voltage applied to an electronic precipitator as recited in claim 6 wherein said control circuit includes logic means.
Claim 17
Dependent Claim
25 words
The system for automatically controlling a voltage applied to an electronic precipitator as recited in claim 10 wherein said time delay means include capacitive means.
Claim 18
Independent Claim
186 words
A system for automatically controlling a voltage applied to an electronic precipitator having alternating conducting and nonconducting states, said system comprising: a. controllable switch means; b. means for applying an alternating voltage to said controllable switch means; c. a control circuit including gating means responsive to the nonconducting state of said electronic precipitator for providing a gating signal at a progressively decreasing phase retard angle to said controllable switch means during said nonconducting state of said electronic precipitator; e. said controllable switch means veing responsive to said gating means to control the application of said voltage to said electronic precipitator; e. lockout means responsive to said conducting state of said electronic precipitator to inhibit said gating signal to said controllable switch means during said conducting state; and f. said gating means including time delay means responsive to said conducting state of said electronic precipitator to delay said gating signal to said controllable switch means for a period of time which varies as a function of the duration of said conducting state following an alternation of said electronic precipitator from a conducting state to a nonconducting state.
Claim 19
Independent Claim
186 words
A system for automatically controlling a voltage applied to an electronic precipitator having alternating conducting and nonconducting states, said system comprising: a. controllable switch means; b. means for applying an alternating voltage to said controllable switch means; c. a control circuit including gating means responsive to the nonconducting state of said electronic precipitator for providing a gating signal at a progressively decreasing phase retard angle to said controllable switch means during said nonconducting state of said electronic precipitator; e. said controllable switch means veing responsive to said gating means to control the application of said voltage to said electronic precipitator; e. lockout means responsive to said conducting state of said electronic precipitator to inhibit said gating signal to said controllable switch means during said conducting state; and f. said gating means including time delay means responsive to said conducting state of said electronic precipitator to delay said gating signal to said controllable switch means for a period of time which varies as a function of the duration of said conducting state following an alternation of said electronic precipitator from a conducting state to a nonconducting state.
Claim 20
Independent Claim
271 words
A system for automatically controlling the voltage applied to an electronic precipitator having alternating conducting and nonconducting states, said system comprising: a. controllable switch means; b. means for applying an alternating voltage to said controllable switch means; c. a control circuit including gating means responsive to the nonconducting state of said electronic precipitator to selectively provide a gating signal to said controllable switch means during said nonconducting state of said electronic precipitator; d. said controllable switch means responsive to said gating means to control the application of said voltage to said electronic precipitator; e. lockout means responsive to said conducting state of said electronic precipitator to inhibit said gating signal to said controllable switch means during said conducting state; f. said gating means including time delay means responsive to said conducting state of said electronic precipitator to delay said gating signal to said controllable switch means for a variable period of time following an alternation of said electronic precipitator from a conducting state to a nonconducting state, said variable period of time varying as a function of the duration of said conducting state; g. a current limiting reactor coupled in circuit with said controllable switch means and including a plurality of inductive elements, each of said inductive elements connected in electrical series with each other; each of said inductive elements including a single-layer winding having a plurality of electrical turns spaced apart from each other; and each of said inductive elements having a magnetic path, said magnetic path including an air section and an iron section, the length of said air section being greater than the length of said iron section.
Claim 21
Independent Claim
271 words
A system for automatically controlling the voltage applied to an electronic precipitator having alternating conducting and nonconducting states, said system comprising: a. controllable switch means; b. means for applying an alternating voltage to said controllable switch means; c. a control circuit including gating means responsive to the nonconducting state of said electronic precipitator to selectively provide a gating signal to said controllable switch means during said nonconducting state of said electronic precipitator; d. said controllable switch means responsive to said gating means to control the application of said voltage to said electronic precipitator; e. lockout means responsive to said conducting state of said electronic precipitator to inhibit said gating signal to said controllable switch means during said conducting state; f. said gating means including time delay means responsive to said conducting state of said electronic precipitator to delay said gating signal to said controllable switch means for a variable period of time following an alternation of said electronic precipitator from a conducting state to a nonconducting state, said variable period of time varying as a function of the duration of said conducting state; g. a current limiting reactor coupled in circuit with said controllable switch means and including a plurality of inductive elements, each of said inductive elements connected in electrical series with each other; each of said inductive elements including a single-layer winding having a plurality of electrical turns spaced apart from each other; and each of said inductive elements having a magnetic path, said magnetic path including an air section and an iron section, the length of said air section being greater than the length of said iron section.
Claim 22
Dependent Claim
87 words
A control circuit for an electronic precipitator, said control circuit comprising: first means for providing a progressively increasing voltage to said precipitator; second means for detecting a conducting state of said precipitator and responsive thereto to provide an output signal corresponding to the time duration of said conducting state; third means responsive to said output signal for inhibiting said voltage to said precipitator duriNg said conducting state and for reducing said voltage as a function of the time duration of said conducting state upon the reapplication thereof.
Claim 23
Dependent Claim
87 words
A control circuit for an electronic precipitator, said control circuit comprising: first means for providing a progressively increasing voltage to said precipitator; second means for detecting a conducting state of said precipitator and responsive thereto to provide an output signal corresponding to the time duration of said conducting state; third means responsive to said output signal for inhibiting said voltage to said precipitator duriNg said conducting state and for reducing said voltage as a function of the time duration of said conducting state upon the reapplication thereof.
References Cited (Backward Citations)
US709485A
Cited
US2561537A
Cited
US2970252A
Cited
US3507096A
Cited
US3452214A
Cited
US3577708A
Cited
US3648437A
Cited
US3622839A
Cited
US3772853A
Cited
US3745749A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |