US4037147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isolation amplifier for resistive and inductive loads
Assignee: United States Department of the Navy
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Filing: 1976-02-26
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Granted: 1977-07-19
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Expires: 1996-02-26
Abstract
Abstract Isolation amplifier circuitry for driving inductive as well as resistive ds in an interchangeable circuit design. The device comprises a differential amplifier having both A.C. and D.C. feedback paths when used in both modes of operation with a capability of programmable gain.
Inventors
- 👤 Robert Neal Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:20
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; H; H03; H03F; H03F1/00; H03F1/56; H03F1/565
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
183 words
Isolation amplifier circuitry for use with inductive loads comprising: a. differential amplification means for producing an amplified signal; b. a stator winding connected to said differential amplification means for producing a flux field which varies with said amplified signal; c. D.C. feedback resistive means connected to said stator winding for feeding back D.C. potentials from said stator winding to the input of said differential amplification means to prevent said differential amplification means from going into saturation; d. compensation winding means for detecting said flux field produced by said stator winding and producing an A.C. signal which varies with said detected flux field; e. A.C. feedback resistive means connected to said compensation winding means for feeding back said A.C. signal produced in said compensation winding to said input of said differential amplification means to adjust overall gain of said circuitry; wherein said A.C. signal produced by said compensation winding is representative of an A.C. signal produced by a rotor winding and delivered to a load connected to said rotor winding such that said gain of said overall circuitry is properly adjusted for said load.
Claim 2
Dependent Claim
183 words
Isolation amplifier circuitry for use with inductive loads comprising: a. differential amplification means for producing an amplified signal; b. a stator winding connected to said differential amplification means for producing a flux field which varies with said amplified signal; c. D.C. feedback resistive means connected to said stator winding for feeding back D.C. potentials from said stator winding to the input of said differential amplification means to prevent said differential amplification means from going into saturation; d. compensation winding means for detecting said flux field produced by said stator winding and producing an A.C. signal which varies with said detected flux field; e. A.C. feedback resistive means connected to said compensation winding means for feeding back said A.C. signal produced in said compensation winding to said input of said differential amplification means to adjust overall gain of said circuitry; wherein said A.C. signal produced by said compensation winding is representative of an A.C. signal produced by a rotor winding and delivered to a load connected to said rotor winding such that said gain of said overall circuitry is properly adjusted for said load.
Claim 3
Dependent Claim
35 words
The isolation amplifier circuitry of claim 1 further comprising low impedance capacitive means connected to said D.C. feedback resistive means and ground potential for shunting A.C. signals applied to said stator winding to ground potential.
Claim 4
Dependent Claim
35 words
The isolation amplifier circuitry of claim 1 further comprising a plurality of connectors for disconnecting said differential amplification means and said D.C. feedback resistive means for interchangeable use in an isolation amplifier for resistive loads.
Claim 5
Dependent Claim
42 words
The isolation amplifier circuitry of claim 2 further comprising a plurality of connectors for disconnecting said differential amplification means, said D.C. feedback resistive means and said low impedance capacitive means as a single electrical component for interchangeable use in an isolation amplifier.
References Cited (Backward Citations)
US3575647A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |