Patent US3840800A successfully refreshed from Google Patents.
US3840800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current control device
Assignee: Novanex Automation NV
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Filing: 1972-11-30
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Granted: 1974-10-08
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Expires: 1992-11-30
Abstract
Abstract A circuit arrangement for controlling an alternating current through a load in response to a control signal applied to its input terminals is provided with an improved organization of a firing circuit arrangement which in its simplest form comprises only two transistors. With a suitable dimensioning of the resistors and capacitors associated with two transistors, highly equivalent voltage waveforms of opposite polarity can be produced during successive half cycles in response to the control signal provided from an asymmetric signal source to fire a semiconductor switch element through its gate control terminal in dependence on that control signal.
Inventors
- 👤 R Laupman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:04
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/08; H02M1/084; G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; G05F1/445; G05F1/45; G05F1/455
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
323 words
In combination with an A.C. circuit having first and second supply terminals, an A.C. load and a bilateral switching diode connected in series between said supply terminals, said switching diode having first and second electrodes connected respectively to said first supply terminal and to said load and having a control electrode to control the current through said load, a series RC circuit having a capacitive portion and a resistive portion respectively connected to said first and second electrodes of the bilateral switching diode, and a bilateral diode connected between said control electrode and the junction between the protions of said series RC circuit whereby to control the switching time of said switching diode during successive half cycles of the supply in accord with voltage variations at said junction; a control circuit for modifying said voltage variations, said control circuit comprising: a pair of rectifying circuits connected in parallel and each including a diode and a capacitor in series in which the diodes of the two rectifying circuits are oppositely poled; an auxiliary capacitor; said rectifying circuits and said auxiliary capacitor being connected in series to each other with one terminal of the capacitor of each rectifying circuit connected to said first supply terminal and one terminal of said auxiliary capacitor connected to said junction of the series RC circuit; and control input means connected to said rectifying circuits for controlling said voltage variations at said junction of the series RC circuit and assuring that essentially similar voltage waveforms of opposite polarity appear at such juction during successive half cycles of the A.C. supply, said control input means comprising a pair of transistors of opposite conductivity type having their emitter-collector paths connected between the junctions of the capacitors and diodes of said rectifying circuits, one of said transistors having its base electrode connected to said first supply terminal and said other transistor having its base electrode adapted for connection to a control signal input.
Claim 2
Dependent Claim
323 words
In combination with an A.C. circuit having first and second supply terminals, an A.C. load and a bilateral switching diode connected in series between said supply terminals, said switching diode having first and second electrodes connected respectively to said first supply terminal and to said load and having a control electrode to control the current through said load, a series RC circuit having a capacitive portion and a resistive portion respectively connected to said first and second electrodes of the bilateral switching diode, and a bilateral diode connected between said control electrode and the junction between the protions of said series RC circuit whereby to control the switching time of said switching diode during successive half cycles of the supply in accord with voltage variations at said junction; a control circuit for modifying said voltage variations, said control circuit comprising: a pair of rectifying circuits connected in parallel and each including a diode and a capacitor in series in which the diodes of the two rectifying circuits are oppositely poled; an auxiliary capacitor; said rectifying circuits and said auxiliary capacitor being connected in series to each other with one terminal of the capacitor of each rectifying circuit connected to said first supply terminal and one terminal of said auxiliary capacitor connected to said junction of the series RC circuit; and control input means connected to said rectifying circuits for controlling said voltage variations at said junction of the series RC circuit and assuring that essentially similar voltage waveforms of opposite polarity appear at such juction during successive half cycles of the A.C. supply, said control input means comprising a pair of transistors of opposite conductivity type having their emitter-collector paths connected between the junctions of the capacitors and diodes of said rectifying circuits, one of said transistors having its base electrode connected to said first supply terminal and said other transistor having its base electrode adapted for connection to a control signal input.
Claim 3
Dependent Claim
28 words
A current control device in accordance with claim 1, characterized in that a capacitor is connected between the base of said one transistor and said reference potential conductor.
Claim 4
Dependent Claim
41 words
A current control device in accordance with claim 1, characterized in that said two transistors have their emitters interconnected through an auxiliary resistor, said resistor being dimensioned such that differences, if any, in the operational parameters of said transistors are compensated.
Claim 5
Dependent Claim
41 words
A current control device in accordance with claim 1, characterized in that said two transistors have their emitters interconnected through an auxiliary resistor, said resistor being dimensioned such that differences, if any, in the operational paraMeters of said transistors are compensated.
Claim 6
Dependent Claim
29 words
In the combination as defined in claim 1 wherein the A.C. circuit is of the three phase type in which said first supply terminal constitutes the common star point.
Claim 7
Dependent Claim
177 words
In the combination as defined in claim 5 wherein a second A.C. load and a second bilateral switching diode are connected in series between a further supply terminal and said first supply terminal with said second switching diode having one electrode connected with said first supply terminal, a second electrode connected to said second load and having a control electrode; a second series RC circuit having a capacitive portion and a resistive portion connected respectively to said first supply terminal and to said second electrode of said second switching diode; a second bilateral diode connected between said control electrode of said second switching diode and the junction between said portions of said second series RC circuit; a second auxiliary capacitor; and a second pair of rectifying circuits connected in parallel and each including a further diode in which such further diodes are oppositely poled and connected in series with said second auxiliary capacitor to said junction of said second series RC circuit, said further diodes being connected respectively to the capacitors of the first mentioned rectifying circuits.
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) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |