Patent US4028610A successfully refreshed from Google Patents.
US4028610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inverters supplying a high frequency alternating current
Assignee: Thales SA
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Filing: 1975-08-18
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Granted: 1977-06-07
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Expires: 1995-08-18
Abstract
Abstract An inverter embodiment provided with an enhanced A.C. output signal frequency upper limit and with an improved circuit protection. This protection operates when the load impedance varies outside permitted limits. In the inverter the number m of pairs of controlled rectifiers and inductances is made equal to 2q, q representing groups of at least two pairs, with each group having the series-connected rectifier and inductance components forming one pair connected in parallel with those forming the other pair, the rectifiers being connected to conduct in opposite directions. In addition, a fault detector is connected via an inductance to the output terminals of the DC source and further is coupled to the output which supplies the load. The value of the Q factor of the coupling means, which means are tuned to the A.C. output signal frequency, depends on the load impedance. A major increase in this impedance results in energy being returned to the source.
Inventors
- 👤 Edmond Cord'homme
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:20
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/10; H02H7/12; H02H7/122; H02H7/1227; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/523; H02M7/5233
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
172 words
In a D.C. to A.C. power inverter having input terminals connectable to a source of direct current; output terminals connectable to an alternating current load; first circuit means for connecting the input and output terminals, the first circuit means including a first pair of controlled rectifiers connected through first and second inductors; and a capacitor coupled to the midpoint between the first and second inductors and to a ground or reference potential, second circuit means for connecting the input and output terminals, the second circuit means including a second pair of controlled rectifiers, each controlled rectifier in the second pair of controlled rectifiers being connected across a respective controlled rectifier in the first pair of controlled rectifiers and poled in the opposite direction thereto; a detector having its output connected to the input terminals; and means tuned to the frequency of the alternating current and having a Q factor dependent upon the magnitude of the impedance of the alternating current load for coupling the input of the detector to the output terminals.
Claim 2
Dependent Claim
172 words
In a D.C. to A.C. power inverter having input terminals connectable to a source of direct current; output terminals connectable to an alternating current load; first circuit means for connecting the input and output terminals, the first circuit means including a first pair of controlled rectifiers connected through first and second inductors; and a capacitor coupled to the midpoint between the first and second inductors and to a ground or reference potential, second circuit means for connecting the input and output terminals, the second circuit means including a second pair of controlled rectifiers, each controlled rectifier in the second pair of controlled rectifiers being connected across a respective controlled rectifier in the first pair of controlled rectifiers and poled in the opposite direction thereto; a detector having its output connected to the input terminals; and means tuned to the frequency of the alternating current and having a Q factor dependent upon the magnitude of the impedance of the alternating current load for coupling the input of the detector to the output terminals.
Claim 3
Dependent Claim
40 words
The D.C. to A.C. power inverter recited in claim 1 wherein: the detector is a diode rectifier bridge having its output pair of junctions connected to the input terminals and its input pair of junctions connected to the coupling means.
Claim 4
Dependent Claim
36 words
The D.C. to A.C. power inverter recited in claim 2 wherein the coupling means includes: an inductance connected across the input pair of junctions of the bridge; and a resonant circuit inductively coupled to the inductance.
Claim 5
Dependent Claim
30 words
The D.C. to A.C. power inverter recited in claim 2 wherein the coupling means includes: a transformer having a winding connected across the input pair of junctions of the bridge.
References Cited (Backward Citations)
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US3487289A
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US3601683A
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US3835366A
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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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |