Patent US3597630A successfully refreshed from Google Patents.
US3597630A
Expired / Lapsed
US
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Transient voltage suppressor
Assignee: Bendix Corp
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Filing: 1969-04-01
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Granted: 1971-08-03
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Expires: 1989-04-01
Abstract
Abstract A circuit for eliminating the effects of undesirable transient voltages generated by the removal of a primary source voltage from, or interruption of current flow through the windings of an inductive element.
Inventors
- 👤 Albert W Compoly
- 👤 Peter A Vincent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:12
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5387; H02M7/53871; H02M7/538; H02M7/53803; H02M7/53806
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
83 words
Circuit means for suppressing transient voltages comprising in combination, switching mans, a transformer having primary and secondary windings, circuit means connecting said switching means to a power source and to said primary winding of said transformer for energizing said transformer when said switching means is in the on-state, and means responsive to said switching means being switched to the off-state to provide a low-impedance path across said primary winding for clipping transient voltages generated at switch off of current flow to said transformer.
Claim 2
Dependent Claim
83 words
Circuit means for suppressing transient voltages comprising in combination, switching mans, a transformer having primary and secondary windings, circuit means connecting said switching means to a power source and to said primary winding of said transformer for energizing said transformer when said switching means is in the on-state, and means responsive to said switching means being switched to the off-state to provide a low-impedance path across said primary winding for clipping transient voltages generated at switch off of current flow to said transformer.
Claim 3
Dependent Claim
17 words
The combination as set forth in claim 1 in which said switching means form a push-pull circuit.
Claim 4
Dependent Claim
15 words
The combination as set forth in claim 1 in which said switching means are transistors.
Claim 5
Dependent Claim
16 words
The combination as set forth in claim 1 in which said transformer has an iron core.
Claim 6
Dependent Claim
51 words
The combination as set forth in claim 1 in which said means for providing a low-impedance path across said primary winding includes a transistor biased in a nonconducting state when current is flowing to said transformer and biased in a conducting state upon the interruption of current flow to said transformer.
Claim 7
Dependent Claim
39 words
The combination as set forth in claim 5 having a second transistor biased to a nonconducting state by a Zener diode and arranged to bias the first-mentioned transistor in a nonconducting state when current is flowing to said transformer.
Claim 8
Dependent Claim
24 words
The combination as set forth in claim 1 in which said last-mentioned means includes a transistor and a diode to provide a low-impedance path.
Claim 9
Dependent Claim
24 words
The combination as set forth in claim 7 and including means for preventing leakage current from biasing said last-named transistor to a conducting state.
Claim 10
Dependent Claim
42 words
The combination as described in claim 1 in which the switching means includes a pair of transistors connected in a push-pull circuit across two halves of the primary winding of the transformer to alternately energize the two halves of the primary winding.
Claim 11
Dependent Claim
66 words
The combination as described in claim 9 in which the means to provide a low-impedance path across the primary winding includes a pair of diodes connected in series with the primary winding and a transistor connected to a junction between the diodes and to a center tap of the primary winding to provide a low-impedance path across each half of the primary winding of the transformer.
Claim 12
Dependent Claim
21 words
The combination as described in claim 10 including means for rendering the last-mentioned transistor conducting when the switching means is nonconducting.
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |