Patent US3662248A successfully refreshed from Google Patents.
US3662248A
Expired / Lapsed
US
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Trigger circuit for controlled rectifiers
Assignee: Hitachi Ltd
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Filing: 1970-07-23
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Granted: 1972-05-09
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Expires: 1990-07-23
Abstract
Abstract A trigger circuit for controlled rectifiers connected in series such as a converter in DC transmission systems. A trigger signal for controlled rectifiers is supplied from secondary windings which are disposed on an iron core together with a primary conductor in a current transformer system. Said primary conductor consists of a two-way circuit in which circulates a current for producing a trigger signal. Compensating windings are additionally disposed on said iron core, which combine with said two-way circuit of said primary conductor to prevent an erroneous trigger signal from being generated.
Inventors
- 👤 Hisao Amano
- 👤 Akiteru Ueda
- 👤 Kenjiro Yokoyama
- 👤 Fumio Ogata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:34
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/08; H02M1/088
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
109 words
A trigger circuit for controlled rectifiers comprising source means for generating a trigger signal-producing current; a primary conductor in the form of a two-way circuit coupled to said source means which passes said current supplied by said source means; and iron cores each provided with individual secondary windings each producing an independent voltage in the form of a trigger signal, said cores being threaded by said primary conductor and having compensating means including a pair of compensating windings for producing a voltage through said primary conductor which prevents an erroneous trigger signal from said secondary windings, said iron cores being respectively coupled to each side of said two-way circuit.
Claim 2
Dependent Claim
109 words
A trigger circuit for controlled rectifiers comprising source means for generating a trigger signal-producing current; a primary conductor in the form of a two-way circuit coupled to said source means which passes said current supplied by said source means; and iron cores each provided with individual secondary windings each producing an independent voltage in the form of a trigger signal, said cores being threaded by said primary conductor and having compensating means including a pair of compensating windings for producing a voltage through said primary conductor which prevents an erroneous trigger signal from said secondary windings, said iron cores being respectively coupled to each side of said two-way circuit.
Claim 3
Dependent Claim
60 words
A trigger circuit for controlled rectifiers according to claim 1, in which said compensating windings are connected in series with opposite polarity in the case of a proper trigger signal but are effectively connected in series with the same polarity for said erroneous trigger signal, whereby said secondary windings are equivalently short-circuited in the case of an erroneous trigger signal.
Claim 4
Dependent Claim
36 words
A trigger circuit for controlled rectifiers according to claim 1, in which said compensating windings are utilized in such a manner that said secondary windings are equivalently opened through a cause of an erroneous trigger signal.
Claim 5
Dependent Claim
57 words
A trigger circuit for controlled rectifiers according to claim 1, in which said compensating windings disposed respectively at each way of said two-way circuit are connected with each other, in such a polar arrangement that the voltages across said compensating windings are added to each other when currents flow in the same direction through said primary conductor.
Claim 6
Dependent Claim
115 words
A trigger circuit for controlled rectifiers according to claim 1, in which one of said Secondary windings on a first iron core disposed at one way of said two-way circuit constituting said primary conductor is connected in parallel with one of said compensating windings on a second iron core disposed at another way of said two-way circuit and the other of said secondary windings on the second iron core is connected in parallel with the other of said compensating windings disposed on the first iron core, in such a polar arrangement that voltages across each of said parallel connections are added to each other when currents flow in the same direction through said primary conductor.
Claim 7
Dependent Claim
32 words
A trigger circuit for controlled rectifiers according to claim 5, in which said secondary windings are disposed on iron cores different from those iron cores on which said compensating windings are disposed.
Claim 8
Dependent Claim
113 words
A trigger circuit for controlled rectifiers according to claim 1, in which one of said secondary windings on a first iron core disposed at one way of said two-way circuit constituting said primary conductor is connected in series with one of said compensating windings on a second iron core disposed at another way of said two-way circuit and the other of said secondary windings on the second iron core is connected in series with the other of said compensating windings disposed on the first iron core, in such a polar arrangement that voltages across each of said series connections offset each other when currents flow in the same direction through said primary conductor.
Claim 9
Dependent Claim
32 words
A trigger circuit for controlled rectifiers according to claim 7, in which said secondary windings are disposed on iron cores different from those iron cores on which said compensating windings are disposed.
Claim 10
Dependent Claim
52 words
A trigger circuit for controlled rectifiers according to claim 1, in which a shielding material for electrostatistically shielding said primary conductor from a main circuit is added to said primary conductor, said shielding material being maintained at the same potential as said current source means and a part of said main circuit.
Claim 11
Dependent Claim
49 words
A trigger circuit for controlled rectifiers according to claim 1, in which a plurality of sets of said secondary windings and compensating windings are disposed on the same iron core, a plurality of sets of said compensating windings being connected in parallel with one another in the same polarities.
Claim 12
Dependent Claim
73 words
A trigger circuit for controlled rectifiers according to claim 1, in which said iron cores and said compensating windings thereon placed at one way of the two-way circuit of said primary conductor have the same potential as the corresponding iron cores and compensating windings placed at another way of said two-way circuit, all of said iron cores and compensating windings being connected to a part of the main circuit of the controlled rectifiers.
Claim 13
Dependent Claim
45 words
A trigger circuit for controlled rectifiers according to claim 1, in which said iron cores disposed at said positions of said primary conductor are used in combination with controlled rectifiers in such a manner that stray capacity has a uniform effect on said primary conductor.
Claim 14
Dependent Claim
31 words
A trigger circuit for controlled rectifiers according to claim 1, in which said secondary windings are wound on iron cores different from the ones on which said compensating windings are wound.
Claim 15
Dependent Claim
54 words
A trigger circuit for controlled rectifiers according to claim 13, in which said compensating windings respectively disposed at each way of said two-way circuit are connected with each other in such a polar arrangement that voltages across said compensating windings offset each other when currents flow in the same direction through said primary conductor.
Claim 16
Dependent Claim
82 words
A trigger circuit for controlled rectifiers comprising a source means for generating a trigger signal-producing current; a primary conductor for passing a current due to said source means; an iron core on which are disposed a secondary winding to produce a voltage, which is a trigger signal, due to said current passing said primary conductor; and a compensating winDing disposed on such a portion of said iron core that is just opposite to said secondary winding with respect to said primary conductor.
Claim 17
Dependent Claim
82 words
A trigger circuit for controlled rectifiers comprising a source means for generating a trigger signal-producing current; a primary conductor for passing a current due to said source means; an iron core on which are disposed a secondary winding to produce a voltage, which is a trigger signal, due to said current passing said primary conductor; and a compensating winDing disposed on such a portion of said iron core that is just opposite to said secondary winding with respect to said primary conductor.
Claim 18
Dependent Claim
50 words
A trigger circuit for controlled rectifiers according to claim 15, in which said secondary winding and compensating winding are connected in parallel with each other in such a polar arrangement that voltages across said respective windings due to said current flowing through said primary conductor are offset by each other.
Claim 19
Dependent Claim
48 words
A trigger circuit for controlled rectifiers according to claim 15, in which said secondary winding is connected in series with said compensating winding in such a polar arrangement that voltages across said respective windings due to said current flowing through said primary conductor are added to each other.
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |