US3694732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inverter providing a variable output voltage
Assignee: GENERALE D'ELECTRONIQUE IND LEPAUTE Cie
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Filing: 1970-09-22
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Granted: 1972-09-26
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Expires: 1990-09-22
Abstract
Abstract An inverter circuit for supplying an AC output from a DC input. The circuit comprises a bridge circuit including four controlled diodes, one in each leg of the bridge. The diodes are fired by a control circuit in such a manner that an AC output is supplied to a load connected across a diagonal of the bridge.
Inventors
- 👤 Pierre Nollace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:03
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
164 words
An inverter comprising two pairs of controlled rectifiers connected in a bridge circuit, an input across a first diagonal of said bridge for connection to a direct current supply and an output across a second diagonal of said bridge for connection to an alternating current load, the controlled rectifiers of one pair having their anodes connected to a positive terminal of the input and the controlled rectifiers of the other pair having their cathodes connected to a negative terminal of the input, means for controlling the firing time of said rectifiers such that the rectifiers of a first pair are maintained continuously in conduction during all periods when no power is to be supplied to the output and one of the conducting rectifiers is extinguished and the rectifier of the second pair in series with it is fired during periods when power is supplied to the output, whereby the output voltage of the inverter is controlled by the firing times of the controlled rectifiers.
Claim 2
Dependent Claim
164 words
An inverter comprising two pairs of controlled rectifiers connected in a bridge circuit, an input across a first diagonal of said bridge for connection to a direct current supply and an output across a second diagonal of said bridge for connection to an alternating current load, the controlled rectifiers of one pair having their anodes connected to a positive terminal of the input and the controlled rectifiers of the other pair having their cathodes connected to a negative terminal of the input, means for controlling the firing time of said rectifiers such that the rectifiers of a first pair are maintained continuously in conduction during all periods when no power is to be supplied to the output and one of the conducting rectifiers is extinguished and the rectifier of the second pair in series with it is fired during periods when power is supplied to the output, whereby the output voltage of the inverter is controlled by the firing times of the controlled rectifiers.
Claim 3
Dependent Claim
109 words
An inverter as claimed in claim 1, wherein the means for controlling the firing time of said rectifiers provides a first train of pulses at twice the inverter output frequency and a second train of pulses delayed with respect to the first train by an amount dependent on the alternating output voltage of the inverter, the pulses of the first train serving to extinguish one of the continuously conducting rectifiers of the first pair and to fire the rectifier of the second pair in series with it, and the pulses of the second train serving to reverse this action to refire the extinguished rectifier and extinguish the fired rectifier.
Claim 4
Dependent Claim
84 words
An inverter as claimed in claim 1, wherein the means for controlling the firing time of said rectifiers provides a first and second train of pulses having periods equal to that of the alternating inverter output voltage, the leading edge of each pulsE extinguishing one of the continuously conducting rectifiers of the first pair and firing the rectifier of the second pair in series with it and the end of each pulse reversing that action refiring the extinguished rectifier and extinguishing the fired rectifier.
Claim 5
Dependent Claim
39 words
An inverter as claimed in claim 3, wherein the pulse trains are produced by superposing a triangular waveform voltage with a direct voltage, wherein the amplitude of said direct voltage depends on the alternating output voltage of the inverter.
Claim 6
Dependent Claim
20 words
An inverter as claimed in claim 1, further comprising a diode connected in parallel with each of said controlled rectifiers.
Claim 7
Dependent Claim
37 words
Apparatus as claimed in claim 1, further comprising a comparator means connected to sample the inverter output voltage, compare said voltage with a reference potential and to provide an output signal indicative of the inverter 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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |