US3626283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for monitoring and indicating an operational failure of a linear voltage differential transformer
Assignee: Bendix Corp
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Filing: 1969-12-11
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Granted: 1971-12-07
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Expires: 1989-12-11
Abstract
Abstract A device for monitoring and indicating an operational failure of a linear voltage differential transformer and including summing means which sums the secondary voltages from the transformer. The sum signal is converted to a direct current voltage which is applied to an operational amplifier where it is balanced with a reference direct current voltage of equal amplitude and opposite polarity. An alternating current signal is also applied to the amplifier causing the amplifier to provide an alternating current output. Failure of the transformer or any part of the monitor causes the direct current voltages to become unbalanced resulting in the amplifier providing a direct current output. An indicator connected to the amplifier provides an indication of failure in response to a direct current output and not in response to an alternating current output from the amplifier.
Inventors
- 👤 Robert L James
- 👤 Frank Antonazzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:40
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/04; G; G01; G01R; G01R31/00; G01R31/50
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
212 words
A device for monitoring a linear voltage differential transformer providing a plurality of alternating current outputs, comprising means connected to the transformer for providing a direct current voltage corresponding to the sum of the alternating current outputs from the transformer, means for providing a reference direct current voltage of equal amplitude and opposite polarity to the first mentioned direct current voltage to initially balance the first mentioned direct current voltage, and indicating means connected to the direct current voltage means and to the reference voltage means for providing no indication when the direct current voltages are balanced and providing an indication when the direct current voltages are not balanced, the indicating means including means for providing an alternating current signal, an operational amplifier connected to the sum voltage means, to the reference voltage means and to the alternating current signal means and providing an alternating current output in response to the alternating current signal when the direct current voltages are balanced and a direct current output when the direct current voltages are not balanced, and an indicator connected to the operational amplifier and providing an indication in response to a direct current output from the operational amplifier and providing no indication in response to an alternating current output from the operational amplifier.
Claim 2
Independent Claim
212 words
A device for monitoring a linear voltage differential transformer providing a plurality of alternating current outputs, comprising means connected to the transformer for providing a direct current voltage corresponding to the sum of the alternating current outputs from the transformer, means for providing a reference direct current voltage of equal amplitude and opposite polarity to the first mentioned direct current voltage to initially balance the first mentioned direct current voltage, and indicating means connected to the direct current voltage means and to the reference voltage means for providing no indication when the direct current voltages are balanced and providing an indication when the direct current voltages are not balanced, the indicating means including means for providing an alternating current signal, an operational amplifier connected to the sum voltage means, to the reference voltage means and to the alternating current signal means and providing an alternating current output in response to the alternating current signal when the direct current voltages are balanced and a direct current output when the direct current voltages are not balanced, and an indicator connected to the operational amplifier and providing an indication in response to a direct current output from the operational amplifier and providing no indication in response to an alternating current output from the operational amplifier.
Claim 3
Dependent Claim
298 words
A control system comprising a controlled device; means for providing a command signal; means connected to the controlled device for providing a followup signal and including a linear voltage differential transformer providing a plurality of alternating current outputs and first difference means connected to the transformer for providing the followup signal corresponding to the difference between the outputs from the transformer, second difference means connected to the controlled device, to the command signal means and to the followup signal means for providing a control signal to the controlled device corresponding to the difference between the command signal and the followup signal; and monitoring means including means connected to the transformer for providing a direct current voltage corresponding to the sum of the alternating current outputs from the transformer, means for providing a reference direct current voltage of equal amplitude and opposite polarity to the first-mentioned direct current voltage to initially balance the first-mentioned direct current voltage, and indicating means connected to the direct current voltage means and to the reference voltage means for providing no indication when the direct current voltages are balanced and providing an indication when the direct current voltages are not balanced, the indicating means including means for providing an alternating current signal, an operational amplifier connected to the sum voltage means, to the reference voltage means and to the alternating current signal means and providing an alternating current output in response to the alternating current signal when the direct current voltages are balanced and a direct current output when the direct current voltages are not balanced, and an indicator connected to the operational amplifier and providing an indication in response to a direct current output from the operational amplifier and providing no indication in response to an alternating current output from the operational amplifier.
Claim 4
Dependent Claim
298 words
A control system comprising a controlled device; means for providing a command signal; means connected to the controlled device for providing a followup signal and including a linear voltage differential transformer providing a plurality of alternating current outputs and first difference means connected to the transformer for providing the followup signal corresponding to the difference between the outputs from the transformer, second difference means connected to the controlled device, to the command signal means and to the followup signal means for providing a control signal to the controlled device corresponding to the difference between the command signal and the followup signal; and monitoring means including means connected to the transformer for providing a direct current voltage corresponding to the sum of the alternating current outputs from the transformer, means for providing a reference direct current voltage of equal amplitude and opposite polarity to the first-mentioned direct current voltage to initially balance the first-mentioned direct current voltage, and indicating means connected to the direct current voltage means and to the reference voltage means for providing no indication when the direct current voltages are balanced and providing an indication when the direct current voltages are not balanced, the indicating means including means for providing an alternating current signal, an operational amplifier connected to the sum voltage means, to the reference voltage means and to the alternating current signal means and providing an alternating current output in response to the alternating current signal when the direct current voltages are balanced and a direct current output when the direct current voltages are not balanced, and an indicator connected to the operational amplifier and providing an indication in response to a direct current output from the operational amplifier and providing no indication in response to an alternating current output from the operational amplifier.
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) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |