Patent US3665290A successfully refreshed from Google Patents.
US3665290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic converter
Assignee: International Standard Electric Corp
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Filing: 1971-04-28
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Granted: 1972-05-23
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Expires: 1991-04-28
Abstract
Abstract A circuit including an amplifier and a transistor for rectification including a feedback path to maintain the output voltage proportional to the input voltage. The amplifier also may include a feedback resistor to maintain the transistor at cut-off in the absence of an AC input signal.
Inventors
- 👤 Benjamin Trok
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:36
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/0023; G01R19/22; G01R19/225
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
206 words
An A.C. to D.C. converter comprising: an inverting type amplifier; means including at least positive and negative D.C. input leads connected to said amplifier in a manner to supply a D.C. operating voltage thereto, said amplifier having an input circuit connected from an A.C. source of potential and also having a connection with one of said D.C. input leads, said amplifier including at least a three electrode device, one of said electrodes being a control electrode, said input circuit being connected between said A.C. source and said control electrode, said amplifier having an output; a first transistor having a collector, an emitter, and a base; a first resistor connected from said first transistor collector to the other of said leads, said first transistor base being connected from said amplifier output; feedback means connecting said first transistor emitter to said device control electrode, said first transistor emitter being connected only to said device control electrode through said feedback means as aforesaid and not being electrically connected to any other structure; and a second resistor connected from said control electrode to said amplifier output, said second resistor having a resistance such that said first transistor is cut off when said A.C. source is disconnected from said input circuit.
Claim 2
Dependent Claim
206 words
An A.C. to D.C. converter comprising: an inverting type amplifier; means including at least positive and negative D.C. input leads connected to said amplifier in a manner to supply a D.C. operating voltage thereto, said amplifier having an input circuit connected from an A.C. source of potential and also having a connection with one of said D.C. input leads, said amplifier including at least a three electrode device, one of said electrodes being a control electrode, said input circuit being connected between said A.C. source and said control electrode, said amplifier having an output; a first transistor having a collector, an emitter, and a base; a first resistor connected from said first transistor collector to the other of said leads, said first transistor base being connected from said amplifier output; feedback means connecting said first transistor emitter to said device control electrode, said first transistor emitter being connected only to said device control electrode through said feedback means as aforesaid and not being electrically connected to any other structure; and a second resistor connected from said control electrode to said amplifier output, said second resistor having a resistance such that said first transistor is cut off when said A.C. source is disconnected from said input circuit.
Claim 3
Dependent Claim
165 words
The invention as defined in claim 1, wherein said input circuit includes a capacitor and a third resistor connected in series, said capacitor having one electrode connected to said A.C. source and another electrode connected to one end of said third resistor, the other end of said third resistor being connected to said control electrode, said amplifier including a second transistor having a collector, an emitter and a base, saiD control electrode being said base, a fourth resistor connected from said second transistor collector to said other lead; said first transistor base being connected to said second transistor collector, said second resistor being connected from said second transistor collector to said second transistor base, said feedback means being the only means connecting said first transistor emitter and said device control electrode, said feedback means consisting solely of a single highly conductive lead connected from said first transistor emitter to said second transistor base, said first and second transistors both being of the same conductivity type.
Claim 4
Dependent Claim
27 words
The invention as defined in claim 1, wherein said amplifier includes at least a second transistor of the same conductivity type as that of said first transistor.
Claim 5
Dependent Claim
16 words
The invention as defined in claim 3, wherein said feedback means is a highly conductive lead.
Claim 6
Dependent Claim
16 words
The invention as defined in claim 1, wherein said feedback means is a highly conductive lead.
Claim 7
Dependent Claim
82 words
The invention as defined in claim 5, wherein said amplifier includes a second transistor having a collector, an emitter, and a base, a third resistor connected from said second transistor collector to said other lead, said first transistor base being connected from said second transistor collector, said first transistor emitter being connected to said second transistor base by said highly conductive lead, said second resistor being connected between said second transistor base and collector, said control electrode being said second transistor base.
Claim 8
Dependent Claim
77 words
The invention as defined in claim 1, wherein said amplifier includes a second transistor having a collector, an emitter and a base, a third resistor connected from said second transistor collector to said other lead, said first transistor base being connected from said second transistor collector, said first transistor emitter being connected to said second transistor base, said second resistor being connected between said second transistor base and collector, said control electrode being said second transistor base.
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |