US3646433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for comparing the capacitance of capacitance elements
Assignee: Individual
•
Filing: 1970-04-20
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Granted: 1972-02-29
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Expires: 1990-04-20
Abstract
Abstract In a circuit for capacitance measurement, particularly for comparison of capacity values, a principal capacitor and a reference capacitor, each in series with an auxiliary capacitor, are connected between the terminals of an AC source. The principal capacitor and the reference capacitor are each shunted by two voltage limiting rectifier couplings, and a pair of such couplings, belonging to the principal capacitor and the reference capacitor respectively and having opposite directions of conduction, are completed through a common load. Preferably, said rectifier couplings may comprise diode rectifiers, and some or all of them may additionally comprise Zener diodes.
Inventors
- 👤 Nils Aage Juul Eilersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:30
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R27/26; G01R27/2605
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
82 words
A capacitance measurement circuit, in which a principal capacitor and a reference capacitor, each in series with an auxiliary capacitor, are connected between terminals for the supply of an AC voltage, each of said principal and reference capacitors being shunted by two voltage limiting rectifier couplings having opposite directions of conduction, at least one pair of voltage limiting rectifier couplings associated with said principal capacitor and said reference capacitor respectively and having opposite directions of conduction being completed through a common load.
Claim 2
Dependent Claim
82 words
A capacitance measurement circuit, in which a principal capacitor and a reference capacitor, each in series with an auxiliary capacitor, are connected between terminals for the supply of an AC voltage, each of said principal and reference capacitors being shunted by two voltage limiting rectifier couplings having opposite directions of conduction, at least one pair of voltage limiting rectifier couplings associated with said principal capacitor and said reference capacitor respectively and having opposite directions of conduction being completed through a common load.
Claim 3
Dependent Claim
46 words
A capacitance measurement circuit as in claim 1, in which a pair of voltage limiting rectifier couplings of the principal and reference capacitors, not completed through said common load, each consists of a rectifier diode short circuiting the capacitor in question in its direction of conduction.
Claim 4
Dependent Claim
33 words
A capacitance measurement circuit as in claim 1, in which a pair of voltage limiting rectifier couplings of the principal and reference capacitors, completed through said common load, each comprises a Zener diode.
Claim 5
Dependent Claim
62 words
A capacitance measurement circuit as in claim 1, in which a pair of voltage limiting rectifier couplings of the principal and reference capacitors completed through said common load comprise a common Zener diode bridged by a series connection of two rectifier diodes having the same direction of conduction and having the common point of said rectifier diodes connected to said common load.
Claim 6
Dependent Claim
32 words
A capacitance measurement circuit as in claim 4, comprising two symmetrical pairs of voltage limiting rectifier couplings of the kind set forth in claim 4, each such pair having a common load.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |