Patent US4507723A successfully refreshed from Google Patents.
US4507723A
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Method for adaptive control in a power converter operating in a discontinuous current mode
Assignee: General Electric Co
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Filing: 1983-01-14
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Granted: 1985-03-26
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Expires: 2003-01-14
Abstract
Abstract A method of adaptively controlling the time of rendering the individual controlled devices of a controllable power conversion bridge includes the sensing of the instant in time at which the current from the bridge to a load becomes discontinuous. From the time of this sensing, the time period to a predetermined time such as a normally calculated time of rendering the controlled devices conductive is derived. This time period is then multiplied by a multiplier and the resultant product is combined with the predetermined time to provide an actual time of rendering the controlled devices conductive.
Inventors
- 👤 William D. Brackman, Jr.
- 👤 John D. D'Atre
- 👤 Loren H. Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:27
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/525; H02M7/527; H02M7/529; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/917; Y10S388/922
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
110 words
For use in conjunction with a phase controlled power conversion bridge employing controlled devices for supplying electrical current to a load, a method for improving the linear relationship between the load voltage of the bridge and a command for determining the load voltage comprising: (a) sensing the time at which the load current becomes discontinuous; (b) determining a time period between the time the current becomes discontinuous and a predetermined time, not later than the time of rendering the next controlled device of the bridge conductive; and, (c) determining an actual time for rendering the next controlled device conductive as a function of the predetermined time and said time period.
Claim 2
Dependent Claim
110 words
For use in conjunction with a phase controlled power conversion bridge employing controlled devices for supplying electrical current to a load, a method for improving the linear relationship between the load voltage of the bridge and a command for determining the load voltage comprising: (a) sensing the time at which the load current becomes discontinuous; (b) determining a time period between the time the current becomes discontinuous and a predetermined time, not later than the time of rendering the next controlled device of the bridge conductive; and, (c) determining an actual time for rendering the next controlled device conductive as a function of the predetermined time and said time period.
Claim 3
Dependent Claim
44 words
The invention in accordance with claim 1 wherein the step of determining said actual time includes the steps of: (a) calculating a time interval based upon said time period; and, (b) combining said time interval with said predetermined time to determine said actual time.
Claim 4
Dependent Claim
16 words
The invention in accordance with claim 1 wherein said bridge provides a direct current output voltage.
Claim 5
Dependent Claim
140 words
For use in conjunction with a phase controlled power conversion bridge employing controlled devices for supplying electrical current to a load, a method for improving the linear relationship between the load voltage of the bridge and a command for determining the load voltage comprising: (a) sensing the time at which the load current becomes discontinuous; (b) determining a time period between the time the current becomes discontinuous and a normally calculated time for rendering the next controlled device conductive based upon a presumption of continuous current from the bridge to the load; (c) calculating a time interval based upon said time period and a multiplier defined by predetermined parameters of the bridge and the load; and, (d) determining an actual time for rendering the next controlled device conductive as a function of the normally calculated time and said time interval.
Claim 6
Dependent Claim
140 words
For use in conjunction with a phase controlled power conversion bridge employing controlled devices for supplying electrical current to a load, a method for improving the linear relationship between the load voltage of the bridge and a command for determining the load voltage comprising: (a) sensing the time at which the load current becomes discontinuous; (b) determining a time period between the time the current becomes discontinuous and a normally calculated time for rendering the next controlled device conductive based upon a presumption of continuous current from the bridge to the load; (c) calculating a time interval based upon said time period and a multiplier defined by predetermined parameters of the bridge and the load; and, (d) determining an actual time for rendering the next controlled device conductive as a function of the normally calculated time and said time interval.
Claim 7
Dependent Claim
13 words
The invention in accordance with claim 4 wherein said controlled devices are thyristors.
Claim 8
Dependent Claim
52 words
The invention in accordance with claim 4 wherein said time interval is defined as t 2 and is determined by the expression: t.sub.2 =K·t.sub.1 ; wherein, t 1 =said time period, and K=(1-e -kN ωt.sbsp.M); in which, e=2.71828 k=constant N=number of active bridge devices ω=power source frequency t M =load time constant.
Claim 9
Dependent Claim
30 words
The invention in accordance with claim 4 wherein the actual time for rendering the next controlled device conductive is determined by adding said time interval to the normally calculated time.
Claim 10
Dependent Claim
32 words
The invention in accordance with claim 6 wherein the actual time for rendering the next controlled device conductive is determined by adding the time interval t 2 to the normally calculated time.
Claim 11
Dependent Claim
42 words
The invention in accordance with claim 6 wherein the normally calculated time (β C ) is repeatedly updated (β C ') until time β F to update said actual time (β F ') in accordance with the relationship: β.sub.F '=t.sub.2 +β.sub.C '.
Claim 12
Dependent Claim
43 words
The invention in accordance with claim 6 wherein the normally calculated time (β C ) is repeatedly updated (β C ') until time β F to update said actual time (β F ') in accordance with the relationship: β.sub.F =(t.sub.1 +(β.sub.C '-β.sub.C))K+β.sub.C '.
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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) | 1988-03-25 | 1988-09-24 | 1989-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-25 | 1992-09-24 | 1993-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-25 | 1996-09-24 | 1997-03-26 | $7700.00 | Window Closed / Lapsed |