US3835366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inverters supplying a high frequency alternating current
Assignee: Thales SA
•
Filing: 1973-03-19
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Granted: 1974-09-10
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Expires: 1993-03-19
Abstract
Abstract A dc to ac electric power inverter which includes a series static inverter circuit, having at least two controlled rectifiers interconnected by a self-quench circuit and alternately switched on and off by trigger pulses. The triggering frequency is made equal to the a c output signal frequency divided by an integer greater than the number of rectifier pairs in use so that the upper frequency limit of the output signal is enhanced.
Inventors
- 👤 E Homme
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:06
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/06; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/523
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
163 words
A d.c. to a.c. power inverter comprising: input terminals connectable to a source of direct current, output terminals connectable to an alternating current load, circuit means for connecting said input and output terminals, said circuit means comprising at least one pair of controlledconduction rectifier type switch means connected in series through equal first and second inductors, a capacitor coupled to a midpoint between said first and second inductors and to a ground or reference potential, said interconnected capacitor and inductors forming a conversion oscillator circuit; control trigger generator means for supplying gate firing pulses to said switch means, said conversion oscillator circuit means functioning together with said control trigger generator means to supply an a.c. signal to said output terminals when each of said switch means is gated at a time interval equal to an integral number times the cycle period of said output alternating current wherein said integral number is greater than the number of pairs of switch means in said inverter.
Claim 2
Dependent Claim
163 words
A d.c. to a.c. power inverter comprising: input terminals connectable to a source of direct current, output terminals connectable to an alternating current load, circuit means for connecting said input and output terminals, said circuit means comprising at least one pair of controlledconduction rectifier type switch means connected in series through equal first and second inductors, a capacitor coupled to a midpoint between said first and second inductors and to a ground or reference potential, said interconnected capacitor and inductors forming a conversion oscillator circuit; control trigger generator means for supplying gate firing pulses to said switch means, said conversion oscillator circuit means functioning together with said control trigger generator means to supply an a.c. signal to said output terminals when each of said switch means is gated at a time interval equal to an integral number times the cycle period of said output alternating current wherein said integral number is greater than the number of pairs of switch means in said inverter.
Claim 3
Dependent Claim
34 words
A d.c. to a.c. power inverter as in claim 1, further comprising: an output transformer coupled between said first and second inductors; and said capacitor coupled to a center tap of said output transformer.
Claim 4
Dependent Claim
23 words
A d.c. to a.c. power inverter as in claim 1, further comprising: an output transformer coupled between said capacitor and said ground potential.
Claim 5
Dependent Claim
142 words
A d.c. to a.c. power inverter as in claim 1, wherein said control trigger generator supplies respective firing pulses for alternately switching said switch means from an off-state to an on-state at a predetermined operating frequency thus periodically exciting said conversion oscillator circuit, wherein the time interval separating two successive triggerings of each switch means is made equal to a predetermined full cycle period T of said output a.c. signal multiplied by an integer p selected to be greater than an integer m, where m is the number of pairs of said switch means, said period T being longer than a conduction time T3 corresponding at most to a halfcycle period T/2 so that a blocking time T4 of each said switch means is thus increased by p. T/2 - T3 whereby the maximum output frequency of said power inverter is enhanced.
Claim 6
Dependent Claim
82 words
An inverter as claimed in claim 4, in which the maximum a.c. signal frequency is dependent on a quality Q-factor under load, Qo, of said conversion oscillating circuit and wherein said Q-factor under load is selected to be greater than 3.4/A . p/m, A being the tolerated voltage attenuation expressed in decibels, whereby the maximum a.c. signal frequency then produced by the inverter is close to F p/(mT2 + 2T3), T2 being the intrinsic or turn-off time of the rectifier elements used.
Claim 7
Dependent Claim
63 words
An inverter as claimed in claim 4, wherein the values of the inductance L of the series inductors and the capacitance C of the tuning capacitor of said conversion oscillating circuit are chosen so that the relationship LC (2 pi /2T3)2 1 is satisfied, whereby the maximum frequency F of the signal produced by the inverter increases as the conduction time T3 decreases.
Claim 8
Dependent Claim
42 words
An inverter as claimed in claim 4, wherein said a.c. signal output circuit includes a transformer connected between said conversion oscillating circuit and said load circuit, said transformer being tuned to the frequency of said generated a.c. signal and providing filtering thereof.
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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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |