Patent US3571752A successfully refreshed from Google Patents.
US3571752A
Expired / Lapsed
US
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Transformer coupled multi vibrator pulse generator for fault detection
Assignee: Individual
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Filing: 1968-09-17
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Granted: 1971-03-23
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Expires: 1988-09-17
Abstract
Abstract An AC pulse generator for use in line fault detection is constructed as a manually portable transistorized multivibrator for producing a distinctive signal having a pip, which is applied to the circuit under test. Doing so produces unbalanced currents which produce a net magnetic field along the current path, which can then be detected.
Inventors
- 👤 Rudolph J Sturm Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:08
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/30; G; G01; G01R; G01R31/00; G01R31/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
75 words
An AC pulse generator for providing fault-detection signals, comprising: a. a multivibrator circuit; b. an output transformer having a center-tapped winding forming a part of said multivibrator circuit and a secondary winding connected to output terminal means; and c. at least one capacitive connection extending through said secondary winding from one end of said first-mentioned winding to its center-tap, providing a capacitive shunt across such section of this winding to render the multivibrator circuit asymmetrical.
Claim 2
Dependent Claim
75 words
An AC pulse generator for providing fault-detection signals, comprising: a. a multivibrator circuit; b. an output transformer having a center-tapped winding forming a part of said multivibrator circuit and a secondary winding connected to output terminal means; and c. at least one capacitive connection extending through said secondary winding from one end of said first-mentioned winding to its center-tap, providing a capacitive shunt across such section of this winding to render the multivibrator circuit asymmetrical.
Claim 3
Dependent Claim
55 words
An AC pulse generator according to claim 1, wherein said multivibrator circuit is of the astable type and having two quasi-stable states normally operative to switch periodically from one of said states to the other, and having a third state of stability intermediate said quasi-stable states, said third state being upset by said capacitive connection.
Claim 4
Dependent Claim
39 words
An AC pulse generator according to claim 1, comprising in further combination a capacitor connected across said center tapped winding whereby said multivibrator circuit has an alternating output of nonsinusoidal wave form with at least one pip per cycle.
Claim 5
Dependent Claim
32 words
An AC pulse generator according to claim 1, having at least one additional secondary winding in said transformer; and a multiposition selector switch connected between said windings and said output terminal means.
Claim 6
Dependent Claim
59 words
An AC pulse generator according to claim 4, including a battery for directly driving said multivibrator circuit; and said selector switch being of the ganged type having a plurality of positions for connecting said battery to said multivibrator circuit to power it while also connecting a selected one of said windings of appropriate impedance to said output terminal means.
Claim 7
Dependent Claim
43 words
An AC pulse generator according to claim 1, wherein said transformer has a secondary winding for providing a relatively high voltage, and rectifier means including capacitors connected to the last-mentioned secondary winding for providing high voltage direct current to said output terminal means.
Claim 8
Dependent Claim
37 words
An AC pulse generator according to claim 6, wherein an additional capacitive connection is provided between one end of said primary winding and its center-tap, which capacitive connection includes one of said capacitors of said rectifier means.
References Cited (Backward Citations)
CA594311A
Cited
US3008068A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |