Patent US3743859A successfully refreshed from Google Patents.
US3743859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric switching device including thyristors
Assignee: US Philips Corp
•
Filing: 1972-01-26
•
Granted: 1973-07-03
•
Expires: 1992-01-26
Abstract
Abstract An electric switching device which includes at least two thyristors connected in parallel across a pair of supply conductors. The primary winding of a transformer is connected in one supply conductor and the secondary winding (or windings) is connected to the thyristor control electrodes. When one thyristor conducts it causes a current flow in said primary winding thereby inducing a control pulse in the secondary winding that in turn triggers the remaining thyristors into conduction. The device prevents an overload on the first thyristor to conduct.
Inventors
- 👤 E Exner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:35
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/08; H02M1/088; H02M1/092; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/73; H03K3/00; H03K3/02; H03K3/42; H03K3/53; H03K3/57; H05; H05B; H05B41/00; H05B41/14; H05B41/30; H05B41/32; H05B41/325
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
169 words
An electric switching device comprising, at least two parallel branches each of which includes a thyristor and a current-limiting circuit element, in which the ends of the parallel branches present on the anode sides of the thyristors are connected together to a first supply conductor, and in which the other ends of the parallel branches which are present on the cathode sides of the thyristors are connected together to a second supply conductor, means for couPling together the control circuits for all of the thyristors, characterized in that at least one of the two supply conductors incorporates a primary winding of a transformer, means connecting the control circuits of the thyristors to one or more secondary windings of the transformer in such a manner that upon any of the thyristors becoming conducting a current flows through the primary winding of the transformer, said current inducing a voltage in the secondary windings of the transformer which is coupled to the control electrode of the subsequent thyristors which thereby also conduct.
Claim 2
Dependent Claim
169 words
An electric switching device comprising, at least two parallel branches each of which includes a thyristor and a current-limiting circuit element, in which the ends of the parallel branches present on the anode sides of the thyristors are connected together to a first supply conductor, and in which the other ends of the parallel branches which are present on the cathode sides of the thyristors are connected together to a second supply conductor, means for couPling together the control circuits for all of the thyristors, characterized in that at least one of the two supply conductors incorporates a primary winding of a transformer, means connecting the control circuits of the thyristors to one or more secondary windings of the transformer in such a manner that upon any of the thyristors becoming conducting a current flows through the primary winding of the transformer, said current inducing a voltage in the secondary windings of the transformer which is coupled to the control electrode of the subsequent thyristors which thereby also conduct.
Claim 3
Dependent Claim
38 words
An electric switching device as claimed in claim 1, characterized in that the transformer has only one secondary winding, and the control circuits of the thyristors have a common control conductor which is connected to said secondary winding.
Claim 4
Dependent Claim
112 words
An electric switching device comprising, a pair of supply terminals, a transformer having a primary winding and secondary winding means, at least two parallel connected branch circuits each of which includes a thyristor and a current limiting circuit element in series therewith, means connecting said primary winding in series circuit with said parallel branch circuits across the supply terminals, and means connecting the control electrodes of the thyristors to said secondary winding means so that conduction in any one thyristor produces a current flow in said primary winding which in turn induces a voltage in the secondary winding means of a magnitude to trigger into conduction a second one of the thyristors.
Claim 5
Dependent Claim
112 words
An electric switching device comprising, a pair of supply terminals, a transformer having a primary winding and secondary winding means, at least two parallel connected branch circuits each of which includes a thyristor and a current limiting circuit element in series therewith, means connecting said primary winding in series circuit with said parallel branch circuits across the supply terminals, and means connecting the control electrodes of the thyristors to said secondary winding means so that conduction in any one thyristor produces a current flow in said primary winding which in turn induces a voltage in the secondary winding means of a magnitude to trigger into conduction a second one of the thyristors.
Claim 6
Dependent Claim
40 words
A switching device as claimed in claim 3 further comprising a control terminal coupled to the control electrodes of said thyristors and adapted to apply thereto an ignition control signal that is independent of the current flow in said transformer.
References Cited (Backward Citations)
US3662250A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |