US4425518A
Expired / Lapsed
US
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High voltage field effect transistor pulse apparatus
Assignee: United States Department of the Air Force
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Filing: 1981-03-25
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Granted: 1984-01-10
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Expires: 2001-03-25
Abstract
Abstract A high voltage field effect transistor pulse apparatus utilizing majority carrier power field effect transistor in a series configuration to provide a high speed, high voltage output pulse. A fast non-saturating transformer trigger circuit provides a sharp rise time trigger pulse to initiate the high voltage output pulse, while a turn-off circuit provides the off-trigger pulse signal.
Inventors
- 👤 Walter E. Milberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:05
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/10; H03K17/102; H03K17/51; H03K17/56; H03K17/687; H03K17/689; H03K17/691
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
234 words
A high voltage field effect transistor pulse apparatus comprising in combination a pulse forming means to receive an input pulse signal, said pulse forming means providing a trigger pulse in response to said input trigger signal, a first coupling means connected to said pulse forming means to receive said trigger pulse, a first gating means connected to said first coupling means to receive said trigger pulse, said first gating means being operatively connected to a high voltage, said first gating means being responsive to said trigger pulse to provide a high voltage output pulse with a rise time of less than 25 nanoseconds, said first gating means comprising a plurality of field effect transistors in series, and, a pull down means that is inversely coupled to said first coupling means to receive a control pulse therefrom, said pull down means comprising: a second gating means to receive said control pulse, said second gating means being responsive to said control pulse and providing an off trigger signal, a second coupling means to receive said off trigger signal, said second coupling means having a predetermined coupling ratio, said second coupling means stepping up said off trigger signal to a higher value, said second coupling means including limiting means to limit said off trigger signal to a predetermined voltage, said off trigger signal being applied to said first gating means to terminate said high voltage output pulse.
Claim 2
Dependent Claim
234 words
A high voltage field effect transistor pulse apparatus comprising in combination a pulse forming means to receive an input pulse signal, said pulse forming means providing a trigger pulse in response to said input trigger signal, a first coupling means connected to said pulse forming means to receive said trigger pulse, a first gating means connected to said first coupling means to receive said trigger pulse, said first gating means being operatively connected to a high voltage, said first gating means being responsive to said trigger pulse to provide a high voltage output pulse with a rise time of less than 25 nanoseconds, said first gating means comprising a plurality of field effect transistors in series, and, a pull down means that is inversely coupled to said first coupling means to receive a control pulse therefrom, said pull down means comprising: a second gating means to receive said control pulse, said second gating means being responsive to said control pulse and providing an off trigger signal, a second coupling means to receive said off trigger signal, said second coupling means having a predetermined coupling ratio, said second coupling means stepping up said off trigger signal to a higher value, said second coupling means including limiting means to limit said off trigger signal to a predetermined voltage, said off trigger signal being applied to said first gating means to terminate said high voltage output pulse.
Claim 3
Dependent Claim
28 words
A high voltage field effect transistor pulse apparatus as described in claim 1 wherein said first coupling means comprises a transformer with a one to one turns ratio.
Claim 4
Dependent Claim
22 words
A high voltage field effect transistor pulse apparatus as described in claim 1 wherein said first coupling means includes a saturating core.
Claim 5
Dependent Claim
22 words
A high voltage field effect transistor pulse apparatus as described in claim 1 wherein said predetermined coupling ratio is one to twenty-four.
Claim 6
Dependent Claim
22 words
A high voltage field effect transistor pulse apparatus as described in claim 1 wherein said predetermined voltage is minus four hundred volts.
Claim 7
Dependent Claim
27 words
A high voltage field effect transistor pulse apparatus as described in claim 1 wherein said tranformer comprises a single turn conductor in both said primary and secondary.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |