Patent US4969076A successfully refreshed from Google Patents.
US4969076A
Expired / Lapsed
US
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Load compensating gain control for a series resonant inverter
Assignee: General Electric Co
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Filing: 1989-08-14
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Granted: 1990-11-06
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Expires: 2009-08-14
Abstract
Abstract A series resonant inverter is controlled to maintain a substantially constant gain and a substantially constant bandwidth, thereby ensuring stable operation under all operating conditions. A load compensating gain control circuit generates a unique gain or attenuation factor for each unique set of output load conditions. To maintain constant gain, inverter gain for each set of operating conditions is multiplied by the corresponding gain or attenuation factor. Bandwidth is increased (or decreased) and maintained constant to ensure stable operation.
Inventors
- 👤 Michael J. Schutten
- 👤 John N. Park
- 👤 Ming H. Kuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:18
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5387; H02M7/53871; G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/563; H02M7/4815; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
161 words
An improved dc-to-dc converter, comprising: a resonant inverter having two pairs of controllable switch means, the switch means of each pair being connected in series to define a respective junction therebetween and each pair of series-connected switch means being adapted to be connected in parallel across an external dc supply; a series resonant circuit connected between the junctions of said controllable switch means and comprising a capacitor and an inductor, said inverter being adapted to apply a rectangular wave voltage to said series resonant circuit; a full wave rectifier inductively coupled to said series resonant circuit, the output of said rectifier being adapted to supply a substantially constant preselected output voltage at a substantially constant output current to a load; and load compensating gain control means for maintaining a substantially constant inverter loop gain by multiplying a load compensation factor corresponding to said preselected output voltage and to said output current of said inverter with a voltage gain of said inverter.
Claim 2
Dependent Claim
161 words
An improved dc-to-dc converter, comprising: a resonant inverter having two pairs of controllable switch means, the switch means of each pair being connected in series to define a respective junction therebetween and each pair of series-connected switch means being adapted to be connected in parallel across an external dc supply; a series resonant circuit connected between the junctions of said controllable switch means and comprising a capacitor and an inductor, said inverter being adapted to apply a rectangular wave voltage to said series resonant circuit; a full wave rectifier inductively coupled to said series resonant circuit, the output of said rectifier being adapted to supply a substantially constant preselected output voltage at a substantially constant output current to a load; and load compensating gain control means for maintaining a substantially constant inverter loop gain by multiplying a load compensation factor corresponding to said preselected output voltage and to said output current of said inverter with a voltage gain of said inverter.
Claim 3
Dependent Claim
37 words
The improved converter of claim 1 wherein said load compensating gain control means comprises a programmable digital-to-analog converter, said programmable digital-to-analog converter being responsive to means for programming said digital-to-analog converter to generate said variable compensation factor.
Claim 4
Dependent Claim
35 words
The improved converter of claim 2 wherein said programming means comprises a compensating gain look-up table including a separate respective gain value corresponding to each combination of said preselected output voltage and said output current.
Claim 5
Dependent Claim
71 words
The improved converter of claim 1 wherein said load compensating gain control means comprises: voltage sensing means for continuously monitoring the instantaneous output load voltage; current sensing means for continuously monitoring the instantaneous output load current; and analog computation means responsive to said voltage sensing means and to said current sensing means for calculating said load compensation factor corresponding to the instantaneous output load voltage and the instantaneous output load current.
Claim 6
Independent Claim
107 words
A method for controlling a resonant inverter, said inverter having controllable switch means for producing a rectangular wave signal and applying said rectangular wave signal to a series resonant circuit, the output of said resonant inverter providing a substantially constant preselected output voltage and a substantially constant output current to a load, said method comprising the steps of: determining the voltage gain of said inverter corresponding to said preselected output voltage and said output current; multiplying the voltage gain of said inverter by a compensation factor corresponding to said preselected output voltage and to said output current in order to provide a substantially constant inverter loop gain.
Claim 7
Independent Claim
107 words
A method for controlling a resonant inverter, said inverter having controllable switch means for producing a rectangular wave signal and applying said rectangular wave signal to a series resonant circuit, the output of said resonant inverter providing a substantially constant preselected output voltage and a substantially constant output current to a load, said method comprising the steps of: determining the voltage gain of said inverter corresponding to said preselected output voltage and said output current; multiplying the voltage gain of said inverter by a compensation factor corresponding to said preselected output voltage and to said output current in order to provide a substantially constant inverter loop gain.
Claim 8
Dependent Claim
43 words
The method of claim 5, further comprising: providing a programmable digital-to-analog converter; programming said digital-to-analog converter by a compensating gain loop-up table; and retrieving the respective value of said compensating gain corresponding to said preselected output load voltage and said output load current.
Claim 9
Dependent Claim
58 words
The method of claim 5, wherein the step of determining the voltage gain of said inverter corresponding to said preselected output voltage and said output current comprises: continuously monitoring the instantaneous output load voltage and the instantaneous output load current; and calculating said voltage gain corresponding to the instantaneous output load voltage and the instantaneous output load current.
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) | 1993-11-05 | 1994-05-07 | 1994-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-05 | 1998-05-07 | 1998-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-05 | 2002-05-07 | 2002-11-06 | $7700.00 | Window Closed / Lapsed |