US3657565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control circuit for power control by means of a thyristor
Assignee: ELECTROFACT RADIUMWEG 30 AMERSFOORT NETHERLANDS A Co OF NETHERLANDS BV
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Filing: 1970-08-25
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Granted: 1972-04-18
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Expires: 1990-08-25
Abstract
Abstract The invention concerns the use of a thyristor in a control circuit for electric power control. The thyristor is so connected and controlled that the number of complete half cycles during which the thyristor is conductive and non-conductive is varied, the thyristor being rendered conductive by a control pulse at its gate electrode immediately before or at the start of the half cycles during which the thyristor is to be conductive.
Inventors
- 👤 Johannes Leyten
- 👤 Nicolaas Mur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:50
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/722; H03K17/723
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
147 words
A control circuit for controlling current flow from an alternating current source through a load and comprising thyristor means connected in series between the source and the load and having a gate electrode, and means for selectively producing a control pulse for application to said gate electrode, said last-named means including a transformer having coupled primary and secondary circuits, said secondary circuit having components forming a monostable circuit the output of which, comprising said control pulse, is connected to said gate circuit, a first DC voltage source being provided and supplying a DC supply voltage to said monostable circuit, said primary circuit having electrical components producing current flow in said primary circuit under contRol of said alternating current source, and a second DC voltage source for supplying a DC voltage to said primary circuit for rendering it operative during predetermined one-half cycles of said alternating current source.
Claim 2
Dependent Claim
147 words
A control circuit for controlling current flow from an alternating current source through a load and comprising thyristor means connected in series between the source and the load and having a gate electrode, and means for selectively producing a control pulse for application to said gate electrode, said last-named means including a transformer having coupled primary and secondary circuits, said secondary circuit having components forming a monostable circuit the output of which, comprising said control pulse, is connected to said gate circuit, a first DC voltage source being provided and supplying a DC supply voltage to said monostable circuit, said primary circuit having electrical components producing current flow in said primary circuit under contRol of said alternating current source, and a second DC voltage source for supplying a DC voltage to said primary circuit for rendering it operative during predetermined one-half cycles of said alternating current source.
Claim 3
Dependent Claim
86 words
A circuit according to claim 1, wherein the first DC voltage source is connected between the thyristor means and the transformer secondary winding and the second DC voltage source has one terminal electrically connected to the collector of a transistor included in said primary circuit, the base of said transistor being connected to one terminal of a rectified voltage derived from said alternating current source, the emitter of said transistor being connected to the other terminal of said second DC voltage source and said rectified voltage.
Claim 4
Dependent Claim
32 words
A circuit according to claim 2, characterized in that the collector and emitter electrodes of said transistor are connected in shunt relationship with said primary winding through the intermediary of a condenser.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |