Patent US2495197A successfully refreshed from Google Patents.
Patent US3557381A successfully refreshed from Google Patents.
US3557381A
Expired / Lapsed
US
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Zero switching circuit
Assignee: EAGLE SIGNAL CONTROLS CORP A CORP OF DE
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Filing: 1968-09-27
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Granted: 1971-01-19
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Expires: 1988-09-27
Abstract
Abstract There is provided a signal synchronizing network for providing an output signal when the signal developed by an alternating voltage source is at a predetermined signal level comprising: a first electronic control means having an input circuit adapted to be coupled to the alternating voltage source, and an output circuit; a second electronic control means having a first, second, and control electrode, and exhibiting the characteristics of providing a low impedance to the flow of current between the first and second electrodes from a voltage source coupled across the first and second electrodes upon application of a first level signal to the control electrode, and maintaining the low impedance upon application of a second level signal to the control electrode until the voltage coupled across the first and second electrodes attains a given value; circuit means connected to the control electrode of the second electronic control means for coupling the control electrode to the output circuit of the first electronic control means; and, circuit means connected to the first electrode of the second electronic control means for providing an output signal when the value of the signal developed by the alternating voltage source attains a predetermined level.
Inventors
- 👤 Donald E Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:46
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/145; H; H03; H03K; H03K17/00; H03K17/13; H03K17/136
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
332 words
A switching circuit for switching an alternating voltage source across a load comprising: static switch means having a first, second, and control electrode, said switch means exhibiting the characteristic of presenting a low impedance to current flow from said alternating voltage source to said load when a forward biasing signal is applied to said control electrode; circuit means for applying a forward biasing signal to said control electrode including: first circuit means for developing a signal from a said alternating-voltage source; first and second actuable switching means coupled to said first circuit means for, when both are actuated, applying a said forward biasing signal to said control electrode of said static switch means; means for periodically, and at a given frequency, actuating said first actuable switching means; and means for monitoring the level voltage developed by a said alternating voltage source and actuating said second switching means, said monitoring means including: an electronic control means having a first, second, and control electrode, and exhibiting the characteristics of providing a low impedance to the flow of current between said first and said second electrodes from a said voltage source coupled across said first and second electrodes upon application of a first level signal to said control electrode and maintaining a said low impedance upon application of a second level signal to said control electrode until said voltage coupled across said first and second electrodes attains a given value; second circuit means connected to said control electrode of said electronic control means and adapted to couple said control means to a said alternating voltage source for providing a signal to said control electrode of said control means when the signal developed by a said alternating voltage source attains said predetermined value; and, third circuit means connected to said first electrode of said electronic control means for connecting said control means to said second actuable switching means so that said second switching means is actuated when a said alternating voltage attains a predetermined voltage level.
Claim 2
Dependent Claim
332 words
A switching circuit for switching an alternating voltage source across a load comprising: static switch means having a first, second, and control electrode, said switch means exhibiting the characteristic of presenting a low impedance to current flow from said alternating voltage source to said load when a forward biasing signal is applied to said control electrode; circuit means for applying a forward biasing signal to said control electrode including: first circuit means for developing a signal from a said alternating-voltage source; first and second actuable switching means coupled to said first circuit means for, when both are actuated, applying a said forward biasing signal to said control electrode of said static switch means; means for periodically, and at a given frequency, actuating said first actuable switching means; and means for monitoring the level voltage developed by a said alternating voltage source and actuating said second switching means, said monitoring means including: an electronic control means having a first, second, and control electrode, and exhibiting the characteristics of providing a low impedance to the flow of current between said first and said second electrodes from a said voltage source coupled across said first and second electrodes upon application of a first level signal to said control electrode and maintaining a said low impedance upon application of a second level signal to said control electrode until said voltage coupled across said first and second electrodes attains a given value; second circuit means connected to said control electrode of said electronic control means and adapted to couple said control means to a said alternating voltage source for providing a signal to said control electrode of said control means when the signal developed by a said alternating voltage source attains said predetermined value; and, third circuit means connected to said first electrode of said electronic control means for connecting said control means to said second actuable switching means so that said second switching means is actuated when a said alternating voltage attains a predetermined voltage level.
Claim 3
Dependent Claim
59 words
A switching circuit as defined in claim 1 wherein said static switch means is a triac having first and second electrodes adapted to be connected in series with an alternating voltage source and a load; and, said third circuit means includes a diode coupled between said first electrode of said electronic control means and said second actuatable switching means.
Claim 4
Dependent Claim
134 words
A switching circuit as defined in claim 2 wherein said means for periodically actuating said first actuable switching means includes a transformer having a primary and a secondary winding, said secondary winding connected between said first and second control electrodes of said switch means; and, said first and said second actuable switching means coupled between said first circuit means and said primary winding of said transformer, for, when both are actuated, completing a circuit between said primary winding and said first circuit means; and, said second circuit means includes a second electronic control means having a first, second, and control electrode, said first electrode being coupled to said control electrode of said first electronic control means and said control electrode of said second electronic control means adapted to be coupled across said voltage source.
Claim 5
Dependent Claim
56 words
A switching circuit as defined in claim 3 wherein said transformer includes a feedback winding coupled between said first circuit means and said first actuatable switching means; and said second circuit means includes a switch means coupled to said control electrode of said second electronic control means and adapted to be connected to said voltage source.
Claim 6
Dependent Claim
253 words
A triac switching circuit for switching an alternating voltage source across a load, a signal synchronizing network for providing an output signal when the signal developed by a said alternating voltage source attains a predetermined level comprising: a first electronic control means having an input circuit adapted to be coupled to a said alternating voltage source, and an output circuit means for providing an output signal when said signal reaches a predetermined level; a second electronic control means having a first, second, and control electrode, and exhibiting the characteristics of providing a low impedance to the flow of current between said first and said second electrodes from a said voltage source coupled across said first and second electrodes upon application of a first level signal to said control electrode and maintaining a said low impedance upon application of a second level signal to said control electrode until said voltage coupled across said first and second electrodes attains a given value; first circuit means connected to said control electrode of said second electronic control means for coupling said second control means to said output circuit of said first electronic control means; first actuable switching means having a first, second and control electrode; means coupled to said control electrode of said actuatable switching means for periodically, and at a given frequency, actuating said first actuatable switching means; and said second circuit means includes a second actuatable switching means; said first and said second actuable switching means for, when both are actuated, providing an output signal.
Claim 7
Dependent Claim
253 words
A triac switching circuit for switching an alternating voltage source across a load, a signal synchronizing network for providing an output signal when the signal developed by a said alternating voltage source attains a predetermined level comprising: a first electronic control means having an input circuit adapted to be coupled to a said alternating voltage source, and an output circuit means for providing an output signal when said signal reaches a predetermined level; a second electronic control means having a first, second, and control electrode, and exhibiting the characteristics of providing a low impedance to the flow of current between said first and said second electrodes from a said voltage source coupled across said first and second electrodes upon application of a first level signal to said control electrode and maintaining a said low impedance upon application of a second level signal to said control electrode until said voltage coupled across said first and second electrodes attains a given value; first circuit means connected to said control electrode of said second electronic control means for coupling said second control means to said output circuit of said first electronic control means; first actuable switching means having a first, second and control electrode; means coupled to said control electrode of said actuatable switching means for periodically, and at a given frequency, actuating said first actuatable switching means; and said second circuit means includes a second actuatable switching means; said first and said second actuable switching means for, when both are actuated, providing an output signal.
Claim 8
Dependent Claim
151 words
A triac switching circuit as defined in claim 5 including a third circuit means adapted to be coupled to a said alternating voltage source for providing a signal; and, said means for periodically actuating said first actuatable switching means includes a transformer having a primary and a secondary winding, said primary winding coupled between said third circuit means and said first actuatable switching means, and said secondary winding adapted to be coupled to a said triac; and, said second circuit means includes a third electronic control means having a first, second, and control electrode; and, a diode coupled between said first electrode of said second electronic control means and said control electrode of said third electronic control means, said first and second electrodes of said third electronic control means carrying a said output signal when the value of the signal developed by a said alternating voltage source attains a predetermined level.
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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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |