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Patent US3671761A successfully refreshed from Google Patents.
US3671761A
Expired / Lapsed
US
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Single pulse generating circuit
Assignee: NEC Corp
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Filing: 1971-01-21
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Granted: 1972-06-20
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Expires: 1991-01-21
Abstract
Abstract Electronic switching apparatus employs oppositely poled, shunt connected thyristors selectively activated for energizing a load during only a single half cycle of an applied alternating current waveform. A stabilizing circuit is provided to suppress subsequent, repetitive thyristor conduction intervals which otherwise occur when the load exhibits a significant inductive reactance component.
Inventors
- 👤 Koji Shibuya
- 👤 Teruhi Takano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:21
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/13; H03K17/136
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
156 words
A single pulse generating circuit of the type in which oppositely poled, parallel-connected thyristors are connected in series with an A.C. power source and a load, said circuit including means for firing one of said thyristors including switching means for supplying thereto the output from a synchronized pulse generator controlled by said power source and of a terminal voltage of a previously charged first capacitor, a gate electrode of the other of said thyristors being connected to one electrode of a charging second capacitor of a series circuit which includes in series said second capacitor and a diode, said series circuit being connected in parallel with said load, characterized in that said pulse generating circuit further includes a stabilizing circuit connected in parallel with said second capacitor, said stabilizing circuit incLuding an additional thyristor for limiting the amount of electric charge stored in said second capacitor during succeeding cycles after said other thyristor has first fired.
Claim 2
Dependent Claim
156 words
A single pulse generating circuit of the type in which oppositely poled, parallel-connected thyristors are connected in series with an A.C. power source and a load, said circuit including means for firing one of said thyristors including switching means for supplying thereto the output from a synchronized pulse generator controlled by said power source and of a terminal voltage of a previously charged first capacitor, a gate electrode of the other of said thyristors being connected to one electrode of a charging second capacitor of a series circuit which includes in series said second capacitor and a diode, said series circuit being connected in parallel with said load, characterized in that said pulse generating circuit further includes a stabilizing circuit connected in parallel with said second capacitor, said stabilizing circuit incLuding an additional thyristor for limiting the amount of electric charge stored in said second capacitor during succeeding cycles after said other thyristor has first fired.
Claim 3
Dependent Claim
29 words
A combination as in claim 1, wherein said stabilizing circuit includes a series-connected resistance and capacitance connected in parallel with said second capacitor for selectively energizing said additional thyristor.
Claim 4
Dependent Claim
31 words
A combination as in claim 1, wherein said stabilizing circuit includes a series-connected resistance and voltage reference diode connected in parallel with said second capacitor for selectively energizing said additional thyristor.
References Cited (Backward Citations)
US3558995A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |