US4674022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
SCR priming and sweep-out circuit apparatus
Assignee: Megapulse Inc
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Filing: 1986-07-01
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Granted: 1987-06-16
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Expires: 2006-07-01
Abstract
Abstract An improved priming and sweep-out circuit in which losses are obviated or minimized by transferring energy resulting from such processes back to the power supply, and wherein a single common storage inductance is used in a secondary winding circuit of a saturable-core inductor transformer, the primary of which is series-connected in the SCR-switching energy storage and discharge pulse generating circuit, to serve both in the priming and sweep-out functions, and wherein reset circuit inductance does not participate in the energy transfer or storage functions.
Inventors
- 👤 Peter Ver Planck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:03
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/04; H03K17/0403; H03K17/51; H03K17/56; H03K17/72; H03K17/73; H03K17/732; H03K2217/00; H03K2217/0036
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
83 words
A priming and sweep-out circuit for an SCR pulse generator comprising saturable-core inductor means for enabling energy storing and discharging under the control of the gating of series-connected SCR-switching means, said circuit having, in combination, secondary winding means transformer-coupled with said saturable inductor means and connected at each of its terminals through respective diode means and storage inductance to one side of a D.C. power supply, the other side of the supply being connected to an intermediate terminal of said secondary winding means.
Claim 2
Dependent Claim
83 words
A priming and sweep-out circuit for an SCR pulse generator comprising saturable-core inductor means for enabling energy storing and discharging under the control of the gating of series-connected SCR-switching means, said circuit having, in combination, secondary winding means transformer-coupled with said saturable inductor means and connected at each of its terminals through respective diode means and storage inductance to one side of a D.C. power supply, the other side of the supply being connected to an intermediate terminal of said secondary winding means.
Claim 3
Dependent Claim
34 words
A priming and sweep-out circuit as claimed in claim 1 and in which said saturable-core inductor means is further transformer coupled to a further winding to provide re-set current through a further reset inductance.
Claim 4
Dependent Claim
146 words
A priming and sweep-out circuit as claimed in claim 1 and in which means is provided for causing the storage inductance means to receive a ramp of current through one of the diode means upon gating on of the SCR-switching means, with a similar current ramp flowing through the SCR switching means to provide priming until saturation of said saturable-core inductor means which causes the current to vanish to zero and passes current from the said storage inductance into the said power supply; and means operable as the current nears zero and the said saturable-core inductor means comes out of saturation during discharge current reversal for developing a further ramp current through the other diode means, the storage inductance and into said power supply, to sweep minority carriers out of the SCR junction and prevent reverse-voltage transients until the SCR switching means recovers and turns off.
Claim 5
Dependent Claim
43 words
A priming and sweep-out circuit as claimed in claim 3 and in which the turns ratios of the saturable-core inductor means and the secondary winding means on each side of said intermediate terminal thereof are of the order of about 12:7 and 12:5.
Claim 6
Dependent Claim
41 words
A priming and sweep-out circuit as claimed in claim 1 and in which reset circuit inductance is provided, coupled in a manner such that it does not substantially participate in energy storage and transfer functions in said priming and sweep-out circuit.
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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) | 1990-06-15 | 1990-12-15 | 1991-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-15 | 1994-12-15 | 1995-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-15 | 1998-12-15 | 1999-06-16 | $7700.00 | Window Closed / Lapsed |