Patent US3665292A successfully refreshed from Google Patents.
US3665292A
Expired / Lapsed
US
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Electric switching circuits
Assignee: The General Electric Company PLC
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Filing: 1970-09-23
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Granted: 1972-05-23
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Expires: 1990-09-23
Abstract
Abstract In a transistor switching circuit in which a transistor is connected selectively to energize a load circuit including an inductive element, for example an output transformer, and in which a rectifier element is connected across the inductive element in the sense to conduct in response to reverse voltages induced when the transistor switches to its non-conducting condition, an auxiliary winding coupled to the inductive element is connected in series with the rectifier element in a sense such as to oppose the induced reverse voltages, whereby the deenergizing time or recovery time of the inductive element is reduced.
Inventors
- 👤 Adrian Francis Flynn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:42
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/04; H03K17/041; H03K17/0416; H03K17/04166
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
134 words
An electric switching circuit comprising: A. a transistor, B. an output circuit for said transistor, C. means selectively to bias the transistor into a conducting condition, D. an output transformer having i. a first winding ii. a second winding and iii. a third winding, E. means connecting the first winding of said transformer in said output circuit of the transistor, F. load means connected in circuit with said second winding of said transformer, G. rectifier means, and H. means including said third winding connecting said rectifier means across said first winding in such a sense as to be reverse biased when said transistor is in said conducting condition, I. said third winding being connected in such a sense that voltages induced in said first and third windings are in opposition across said rectifier means.
Claim 2
Dependent Claim
134 words
An electric switching circuit comprising: A. a transistor, B. an output circuit for said transistor, C. means selectively to bias the transistor into a conducting condition, D. an output transformer having i. a first winding ii. a second winding and iii. a third winding, E. means connecting the first winding of said transformer in said output circuit of the transistor, F. load means connected in circuit with said second winding of said transformer, G. rectifier means, and H. means including said third winding connecting said rectifier means across said first winding in such a sense as to be reverse biased when said transistor is in said conducting condition, I. said third winding being connected in such a sense that voltages induced in said first and third windings are in opposition across said rectifier means.
Claim 3
Dependent Claim
40 words
An electric switching circuit in accordance with claim 1 wherein said means selectively to bias said transistor into a conducting condition comprises a second transistor having its major current path connected in series with that of the first mentioned transistor.
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 |