US3656153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Analogue-digital converting apparatus
Assignee: Advantest Corp
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Filing: 1970-04-07
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Granted: 1972-04-11
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Expires: 1990-04-07
Abstract
Abstract This disclosure is an analogue-digital converting apparatus wherein a magnetic core is provided with an input winding, a variable winding in which the number of turns can be changed, a fixed winding of a constant number of turns, and the core also having a magnetic flux detecting winding, these windings being coupled to appropriate circuitry such that, as detected by the flux winding, a flux developed in the core by a current in the input winding can be balanced by current introduced in the fixed and variable windings, the latter current being displayed digitally such that its magnitude can be read with a high precision of more than 8 to 9 digits to represent the magnitude of the input current.
Inventors
- 👤 Ikuo Takeda
- 👤 Takashi Suzuki
- 👤 Hikaru Furukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:53
CPC Classifications
G; G01; G01R; G01R1/00; G01R1/28; H; H03; H03M; H03M1/00; H03M1/12; H03M1/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
An analog-digital converting apparatus comprising a magnetic core having an input winding and having a variable winding in which the number of turns can be changed and having a fixed winding; magnetic flux detecting means for detecting the flux in the core; means for coupling an input signal to be converted into said variable winding; means to change the number of turns of the variable winding to substantially cancel the flux in the core attributable to said input signal; means for adjusting the current of said fixed winding to fully cancel out any residual magnetic flux in the core as detected by said detecting means; and means for determining a multiple-digit representation including more-significant digits whose value is proportional to the number of turns of said variable winding and including lesssignificant digits whose value is proportional to the adjusted current in said fixed winding.
Claim 2
Dependent Claim
144 words
An analog-digital converting apparatus comprising a magnetic core having an input winding and having a variable winding in which the number of turns can be changed and having a fixed winding; magnetic flux detecting means for detecting the flux in the core; means for coupling an input signal to be converted into said variable winding; means to change the number of turns of the variable winding to substantially cancel the flux in the core attributable to said input signal; means for adjusting the current of said fixed winding to fully cancel out any residual magnetic flux in the core as detected by said detecting means; and means for determining a multiple-digit representation including more-significant digits whose value is proportional to the number of turns of said variable winding and including lesssignificant digits whose value is proportional to the adjusted current in said fixed winding.
References Cited (Backward Citations)
US3522598A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |