Patent US3636430A successfully refreshed from Google Patents.
US3636430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anticipatory feedback control for inverters
Assignee: ELGAR ELECTRONICS Corp A CORP OF
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Filing: 1970-10-26
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Granted: 1972-01-18
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Expires: 1990-10-26
Abstract
Abstract The invention comprises apparatus for comparing the filtered power transformer output waveform of a pulse-width-modulated inverter circuit with an AC reference voltage waveform and generating output voltage signals to control the inverter drive circuit to the extent necessary to produce an inverter output waveform substantially duplicating the reference voltage waveform and substantially void of low order harmonics. An anticipatory signal developed by a circuit which monitors the change in current with respect to time in a capacitor included in a filter circuit connected to the output of the power transformers provides optimum response of the apparatus to changes in the output waveform beyond prescribed units relative to the reference voltage waveform.
Inventors
- 👤 Andress Kernick
- 👤 Manvel A Geyer
- 👤 Glenn W Ernsberger
- 👤 John F Vonderembse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:09
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5387; H02M7/53871
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
123 words
In power inverter apparatus for converting DC input voltage into AC output voltage, the combination comprising, conductioncontrolled switching means operatively connected between a source of said DC input voltage and an inverter output power transformer, control circuit means operatively connected to said conduction-controlled switching means to control the conduction of said switching means to develop said AC output voltage waveform at said output power transformer, the operation of said control circuit means being a function of said AC output voltage, and an anticipatory feedback circuit means operatively connected between said output power transformer and said control circuit means to supplY a control signal to said control circuit means which is indicative of a change in output power transformer current with respect to time.
Claim 2
Dependent Claim
123 words
In power inverter apparatus for converting DC input voltage into AC output voltage, the combination comprising, conductioncontrolled switching means operatively connected between a source of said DC input voltage and an inverter output power transformer, control circuit means operatively connected to said conduction-controlled switching means to control the conduction of said switching means to develop said AC output voltage waveform at said output power transformer, the operation of said control circuit means being a function of said AC output voltage, and an anticipatory feedback circuit means operatively connected between said output power transformer and said control circuit means to supplY a control signal to said control circuit means which is indicative of a change in output power transformer current with respect to time.
Claim 3
Dependent Claim
40 words
In power inverter apparatus as claimed in claim 1 including a filter capacitor connected across the output terminals of said output power transformer, said anticipatory feedback circuit means including a current responsive means connected in series with said filter capacitor.
Claim 4
Dependent Claim
17 words
In power inverter apparatus as claimed in claim 2 wherein said current responsive means is a resistor.
Claim 5
Dependent Claim
17 words
In power inverter apparatus as claimed in claim 2 wherein said current-responsive means is a current transformer.
Claim 6
Dependent Claim
63 words
In power inverter apparatus as claimed in claim 1 wherein said control circuit means generates signals to control the conduction of said switching means to maintain said AC output voltage within predetermined limits of an AC reference waveform, the control signal of said anticipatory feedback control circuit providing said control circuit means with an indication of impending changes in said AC output voltage.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |