Patent US2731541A successfully refreshed from Google Patents.
Patent US3619658A successfully refreshed from Google Patents.
US3619658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gate controlled switch employing transistors
Assignee: Collins Radio Co
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Filing: 1969-06-17
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Granted: 1971-11-09
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Expires: 1989-06-17
Abstract
Abstract A power transistor is connected in series with diode means, DC source means, and utilization means, with the diode means having its forward impedance presented to current flow through the transistor. A control transistor is connected in series with a current limiting resistor, said DC source and said utilization means. The collector of each transistor is connected to the base of the other to form a feedback loop. Said diode means is connected to provide a constant voltage across the series arrangement of the resistor and the emitter-base electrode circuit of the control transistor, thereby limiting the current through the control transistor. A pulse of proper polarity applied to the collector of the control transistor will divert the collector current thereof from the base of the power transistor, thereby interrupting the feedback loop and turning off the circuit. A pulse of opposite polarity will turn on the circuit.
Inventors
- 👤 Ralph A Prunty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:02
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/04; H03K17/042; H03K17/04213; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
247 words
Switching circuit apparatus of the class described comprising input means, output means, and control mean; first and second opposite polarity transistor means each including first, second and third electrodes; means connecting said first electrode of said first transistor means to said second electrode of said second transistor means; means connecting said first electrode of said second transistor means to said second electrode of said first transistor means and to said control means; first diode means connected between said input means and said first electrode of said first transistor means; first impedance means connected between said input means and said third means of said second transistor means, the current flow through said impedance means being maintained at a substantially constant value by said diode means; second diode means comprising at least two diodes at least one of which is a zener diode, said diode means being connected between said second electrode of said first transistor means and said third electrode of said first transistor means for limiting the reverse bias potential which may be supplied therebetween; second impedance means connected in parallel with said second diode means; and means connecting said third means of said first transistor means to said output means, a pulse of a given polarity applied between said output means and said control means acting to activate said switch circuit apparatus and a pulse of a polarity opposite said given polarity supplied between said control and output means acting to deactivate said switch circuit apparatus.
Claim 2
Dependent Claim
247 words
Switching circuit apparatus of the class described comprising input means, output means, and control mean; first and second opposite polarity transistor means each including first, second and third electrodes; means connecting said first electrode of said first transistor means to said second electrode of said second transistor means; means connecting said first electrode of said second transistor means to said second electrode of said first transistor means and to said control means; first diode means connected between said input means and said first electrode of said first transistor means; first impedance means connected between said input means and said third means of said second transistor means, the current flow through said impedance means being maintained at a substantially constant value by said diode means; second diode means comprising at least two diodes at least one of which is a zener diode, said diode means being connected between said second electrode of said first transistor means and said third electrode of said first transistor means for limiting the reverse bias potential which may be supplied therebetween; second impedance means connected in parallel with said second diode means; and means connecting said third means of said first transistor means to said output means, a pulse of a given polarity applied between said output means and said control means acting to activate said switch circuit apparatus and a pulse of a polarity opposite said given polarity supplied between said control and output means acting to deactivate said switch circuit apparatus.
Claim 3
Dependent Claim
247 words
Switching circuit apparatus of the class described comprising input means, output means, and control means; first and second opposite polarity transistor means each including first, second and third electrodes; means connecting said first electrode of said first transistor means to said second electrode of said second transistor means; means connecting said first electrode of said second transistor means to said second electrode of said first transistor means and to said control means; first diode means connected between said input means and said first electrode of said first transistor means; first impedance means connected between said input means and said third means of said second transistor means, the current flow through said impedance means being maintained at a substantially constant value by said diode means; second diode means comprising at least two diodes at least one of which is a zener diode, said diode means being connected between said second electrode of said first transistor means and said third electrode of said first transistor means for limiting the reverse bias potential which may be supplied therebetween; second impedance means connected in parallel with said first diode means; and means connecting said third means of said first transistor means to said output means, a pulse of a given polarity applied between said output means and said control means acting to activate said switch circuit apparatus and a pulse of a polarity opposite said given polarity supplied between said control and output means acting to deactivate said switch circuit apparatus.
Claim 4
Dependent Claim
247 words
Switching circuit apparatus of the class described comprising input means, output means, and control means; first and second opposite polarity transistor means each including first, second and third electrodes; means connecting said first electrode of said first transistor means to said second electrode of said second transistor means; means connecting said first electrode of said second transistor means to said second electrode of said first transistor means and to said control means; first diode means connected between said input means and said first electrode of said first transistor means; first impedance means connected between said input means and said third means of said second transistor means, the current flow through said impedance means being maintained at a substantially constant value by said diode means; second diode means comprising at least two diodes at least one of which is a zener diode, said diode means being connected between said second electrode of said first transistor means and said third electrode of said first transistor means for limiting the reverse bias potential which may be supplied therebetween; second impedance means connected in parallel with said first diode means; and means connecting said third means of said first transistor means to said output means, a pulse of a given polarity applied between said output means and said control means acting to activate said switch circuit apparatus and a pulse of a polarity opposite said given polarity supplied between said control and output means acting to deactivate said switch circuit apparatus.
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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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |