US3758841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dc to ac static power converter with short circuit protection
Assignee: Motors Liquidation Co
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Filing: 1971-11-11
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Granted: 1973-09-11
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Expires: 1991-11-11
Abstract
Abstract DC voltage is coupled through an active voltage regulator to a voltage inverter to develop a precisely controlled AC output voltage. Feedback from the inverter output supplies requisite operating bias to the regulator only when the inverter develops an output voltage, thus rendering the regulator inoperative in the absence of an output voltage as on the occurrence of a short circuit at the load, thereby affording short circuit protection for the DC to AC converter.
Inventors
- 👤 F Bourbeau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:48
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5383; H02M7/53846; H02M7/53862
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
306 words
A voltage regulated electrical system having short-circuit protection comprising, a source of direct voltage, an inverter having AC output terminals and direct voltage input terminals, voltage regulating means comprising a transistor having an emitter, collector and base, the conductance of said transistor between its collector and emitter being a function of the magnitude of direct voltage applied to its emitter and base, a circuit connecting said source of direct voltage and said direct voltage input terminals of said inverter including in a series connection the collector and emitter of said transistor whereby the voltage applied to the direct voltage input terminals of said inverter is a function of the conductance of said transistor between its collector and emitter, rectifier means coupled to the AC output terminals of said inverter having direct current output terminals, an energizing circuit for said voltage regulating means connected across said direct current output terminals of said rectifier means including in a series connection the emitter and base of said transistor whereby the magnitude of direct voltage applied to said emitter and base of said transistor from said rectifier means is a function of the output voltage of said inverter, said transistor being biased to a substantially nonconductive condition between its collector and emitter when the voltage at the direct current output terminals of said rectifier means is reduced to thereby provide shOrt-circuit protection for said system, variable impedance means connected in series in said energizing circuit for controlling the voltage applied to the emitter and base of said transistor to thereby control the conduction of said transistor between its collector and emitter, voltage sensing means connected across said direct voltage input terminals of said inverter, and means coupling said voltage sensing means and said variable impedance means operative to control said variable impedance means as a function of inverter input voltage.
Claim 2
Dependent Claim
306 words
A voltage regulated electrical system having short-circuit protection comprising, a source of direct voltage, an inverter having AC output terminals and direct voltage input terminals, voltage regulating means comprising a transistor having an emitter, collector and base, the conductance of said transistor between its collector and emitter being a function of the magnitude of direct voltage applied to its emitter and base, a circuit connecting said source of direct voltage and said direct voltage input terminals of said inverter including in a series connection the collector and emitter of said transistor whereby the voltage applied to the direct voltage input terminals of said inverter is a function of the conductance of said transistor between its collector and emitter, rectifier means coupled to the AC output terminals of said inverter having direct current output terminals, an energizing circuit for said voltage regulating means connected across said direct current output terminals of said rectifier means including in a series connection the emitter and base of said transistor whereby the magnitude of direct voltage applied to said emitter and base of said transistor from said rectifier means is a function of the output voltage of said inverter, said transistor being biased to a substantially nonconductive condition between its collector and emitter when the voltage at the direct current output terminals of said rectifier means is reduced to thereby provide shOrt-circuit protection for said system, variable impedance means connected in series in said energizing circuit for controlling the voltage applied to the emitter and base of said transistor to thereby control the conduction of said transistor between its collector and emitter, voltage sensing means connected across said direct voltage input terminals of said inverter, and means coupling said voltage sensing means and said variable impedance means operative to control said variable impedance means as a function of inverter input voltage.
Claim 3
Dependent Claim
233 words
A voltage regulated electrical system having short-circuit protection comprising, a source of direct voltage, an inverter having AC output terminals and direct voltage input terminals, voltage regulating means including a first transistor having an emitter, collector and base, a power input circuit connecting said source of direct voltage and said direct voltage input terminals of said inverter including in a series connection the collector and emitter of said first transistor, rectifier means coupled to the AC output terminals of said inverter and having direct current output terminals, a second transistor having an emitter, collector and base, an energizing circuit for said voltage regulating means connected across said direct current output terminals of said rectifier means including in a series connection the base and emitter of said first transistor and the emitter and collector of said second transistor, the direct voltage output of said rectifier means biasing the base and emitter of said first transistor conductive when said rectifier means has an output voltage and operative to bias said first transistor substantially nonconductive when said rectifier means has no output voltage to thereby provide short-circuit protection for said system, and means connected across said direct voltage input terminals of said inverter and coupled to the base of said second transistor for controlling the conductivity of said second transistor between its emitter and collector as a function of the direct voltage input to said inverter.
Claim 4
Dependent Claim
233 words
A voltage regulated electrical system having short-circuit protection comprising, a source of direct voltage, an inverter having AC output terminals and direct voltage input terminals, voltage regulating means including a first transistor having an emitter, collector and base, a power input circuit connecting said source of direct voltage and said direct voltage input terminals of said inverter including in a series connection the collector and emitter of said first transistor, rectifier means coupled to the AC output terminals of said inverter and having direct current output terminals, a second transistor having an emitter, collector and base, an energizing circuit for said voltage regulating means connected across said direct current output terminals of said rectifier means including in a series connection the base and emitter of said first transistor and the emitter and collector of said second transistor, the direct voltage output of said rectifier means biasing the base and emitter of said first transistor conductive when said rectifier means has an output voltage and operative to bias said first transistor substantially nonconductive when said rectifier means has no output voltage to thereby provide short-circuit protection for said system, and means connected across said direct voltage input terminals of said inverter and coupled to the base of said second transistor for controlling the conductivity of said second transistor between its emitter and collector as a function of the direct voltage input to said inverter.
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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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |