US3582758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rectifier using low saturation voltage transistors
Assignee: International Business Machines Corp
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Filing: 1969-09-30
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Granted: 1971-06-01
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Expires: 1989-09-30
Abstract
Abstract A circuit is employed utilizing the low collector-emitter voltage of a saturated transistor to obtain more efficient rectification of an alternating current supply than is achieved by a diode. A regenerative feedback circuit to the base of the transistor is provided so that once collector-to-emitter current is initiated, current is fed back to the base of the transistor to further drive the transistor into its conducting condition. However, since transistors may operate in a reverse direction when the load voltage is greater than that of the power supply, such regenerative feedback circuit is employed in series with the saturated transistor whereby any reverse collector current due to inverted operation causes the base of such transistor to be cut off, preventing any undesired reverse transistor operation.
Inventors
- 👤 John B Gunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:24
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/21; H02M7/217; H02M7/2173
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
71 words
A rectifying device including a transistor having a base, collector and emitter, a transformer having a primary winding and a secondary winding thereon, such primary winding being in series with the emittercollector current path through said transistor, and said secondary winding being connected to said base, said windings being wound whereby an increase in current through said emitter-collector path causes an increase in current in said base, to provide improved rectification.
Claim 2
Dependent Claim
71 words
A rectifying device including a transistor having a base, collector and emitter, a transformer having a primary winding and a secondary winding thereon, such primary winding being in series with the emittercollector current path through said transistor, and said secondary winding being connected to said base, said windings being wound whereby an increase in current through said emitter-collector path causes an increase in current in said base, to provide improved rectification.
Claim 3
Independent Claim
92 words
A device including a transistor having a base, collector and emitter and a current gain of Beta , a transformer having a primary winding and a secondary winding, said primary winding being in series with the collector-emitter current path of said transistor and said secondary winding being in series with said base-collector current path and wound so as to provide a regenerative effect, the ratio of the number of turns of the secondary to the number of turns of the primary winding being less than the current gain Beta of said transistor.
Claim 4
Independent Claim
92 words
A device including a transistor having a base, collector and emitter and a current gain of Beta , a transformer having a primary winding and a secondary winding, said primary winding being in series with the collector-emitter current path of said transistor and said secondary winding being in series with said base-collector current path and wound so as to provide a regenerative effect, the ratio of the number of turns of the secondary to the number of turns of the primary winding being less than the current gain Beta of said transistor.
Claim 5
Dependent Claim
89 words
In a rectifier circuit wherein there is a rectifying element carrying currEnt in the same direction during each half-cycle of the alternating current supply, the improvement consisting of a transistor as the rectifying element, said transistor having a base, a collector and emitter, a transformer-coupled pair of windings, one winding in series with the collector and the other winding in series with the base, said windings being regeneratively coupled so that an increase in emitter-collector current through the transistor results in a decrease in base-collector current, and vice versa.
Claim 6
Dependent Claim
89 words
In a rectifier circuit wherein there is a rectifying element carrying currEnt in the same direction during each half-cycle of the alternating current supply, the improvement consisting of a transistor as the rectifying element, said transistor having a base, a collector and emitter, a transformer-coupled pair of windings, one winding in series with the collector and the other winding in series with the base, said windings being regeneratively coupled so that an increase in emitter-collector current through the transistor results in a decrease in base-collector current, and vice versa.
Claim 7
Dependent Claim
158 words
In a full-wave rectifying circuit, a first transformer having an input winding and a secondary winding having a center tap and two ends, an output terminal connected to the center tap of said winding, a second transformer having two primary windings, each primary winding being connected in series with respective ends of said secondary winding, two transistors, each having a base, collector and emitter, and each transistor connected so that its collector is connected to its respective primary winding and the emitter of one transistor is connected to the emitter of the second transmitter, an output terminal connected to the connection of said emitters, a secondary winding on said transformer for each primary winding, said secondary winding connecting the base to the collector of its associated transistor, said primary and secondary windings being regeneratively coupled so that changes in emitter-to-collector current in one direction through its associated transistor produces corresponding changes in base current of such associated transistor.
Claim 8
Dependent Claim
158 words
In a full-wave rectifying circuit, a first transformer having an input winding and a secondary winding having a center tap and two ends, an output terminal connected to the center tap of said winding, a second transformer having two primary windings, each primary winding being connected in series with respective ends of said secondary winding, two transistors, each having a base, collector and emitter, and each transistor connected so that its collector is connected to its respective primary winding and the emitter of one transistor is connected to the emitter of the second transmitter, an output terminal connected to the connection of said emitters, a secondary winding on said transformer for each primary winding, said secondary winding connecting the base to the collector of its associated transistor, said primary and secondary windings being regeneratively coupled so that changes in emitter-to-collector current in one direction through its associated transistor produces corresponding changes in base current of such associated transistor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |