US3678298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-step magnetic driver
Assignee: Boeing North American Inc
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Filing: 1971-04-28
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Granted: 1972-07-18
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Expires: 1991-04-28
Abstract
Abstract A drive circuit for pulse modulated excitation of an inductive load impedance and having both a fast turn-on/turn-off capability and minimum power consumption. A first transistorized power amplifier having a rapid turn-off response provides a sustaining excitation subsequent to the drive circuit delay transients, while a compensatory trigger circuit provides a compensatory output trigger wave form for compensating for the drive circuit turn-on delay transients.
Inventors
- 👤 George A Dyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:11
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/01; H03K5/12; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/18; H01F7/1805; H03K17/00; H03K17/04; H03K17/041; H03K17/04113
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
129 words
A magnetic driver system having fast turn-on, fast turn-off and minimum power consumption comprising a first switched transistor circuit for providing a sustaining steady state magnetizing current over the duration of a selected interval and comprising a low-voltage saturable switch, a compensatory second switched transistor circuit responsive to a preselected change in switched state of said first circuit for providing a rapid rise-time pulse of short duration, said second circuit comprising a high current short duration pulsing circuit, the outputs of said first and second circuits being connected in parallel and adapted to cooperate with a single common magnetizing circuit, the response of said second circuit compensating for the slower rise time response of said first circuit, said output of said first circuit being connected by a coupling diode.
Claim 2
Dependent Claim
129 words
A magnetic driver system having fast turn-on, fast turn-off and minimum power consumption comprising a first switched transistor circuit for providing a sustaining steady state magnetizing current over the duration of a selected interval and comprising a low-voltage saturable switch, a compensatory second switched transistor circuit responsive to a preselected change in switched state of said first circuit for providing a rapid rise-time pulse of short duration, said second circuit comprising a high current short duration pulsing circuit, the outputs of said first and second circuits being connected in parallel and adapted to cooperate with a single common magnetizing circuit, the response of said second circuit compensating for the slower rise time response of said first circuit, said output of said first circuit being connected by a coupling diode.
Claim 3
Dependent Claim
40 words
The device of claim 1 in which said first circuit is comprised of a resistively input coupled first phase inverting transistor stage, and a non-phase-inverting saturable switching transistor stage resistively input coupled to an output of said first transistor stage.
Claim 4
Dependent Claim
26 words
The device of claim 1 in which said second circuit is comprised of a non-phase inverting current amplifier stage of like-phased output as said first circuit.
Claim 5
Dependent Claim
48 words
The device of claim 1 in which said second circuit is comprised of a non-phase-inverting current amplifier having an input capacitively coupled to an output of said first stage of said first circuit and having a preselectively poled blocking diode shunted across said input of said second circuit.
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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |