US3887864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Measured-value transducer with a compensating bridge circuit
Assignee: Danfoss AS
•
Filing: 1973-11-14
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Granted: 1975-06-03
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Expires: 1993-11-14
Abstract
Abstract A measuring-transducer circuit arrangement suitable for two-line telemetering systems comprises a bridge circuit, a current regulator, a comparator circuit including a reference element and a reference-voltage resistor for controlling the regulator, and a measuring amplifier. The current regulator and the reference element are in series with a diagonal of the bridge circuit.
Inventors
- 👤 Ole Friis Knudsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:18
CPC Classifications
G; G08; G08C; G08C19/00; G08C19/02; G08C19/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
126 words
A measuring-transducer circuit arrangement suitable for a two-line telemetering system, the circuit arrangement comprising: a first bridge circuit including a compensating resistor And having two bridge diagonals; a current regulator; a comparator circuit comprising a Zener diode forming a reference element for establishing a constant reference voltage and a reference-voltage resistor for developing a voltage used for controlling said current regulator; and a measuring amplifier connected to one of said bridge diagonals, said measuring amplifier controlling a compensating current which in use flows in said compensating resistor; said current regulator and said Zener diode being connected in a series path which also includes the other of said bridge diagonals said series path having two ends respectively for connection to said two lines of said telemetering system.
Claim 2
Dependent Claim
126 words
A measuring-transducer circuit arrangement suitable for a two-line telemetering system, the circuit arrangement comprising: a first bridge circuit including a compensating resistor And having two bridge diagonals; a current regulator; a comparator circuit comprising a Zener diode forming a reference element for establishing a constant reference voltage and a reference-voltage resistor for developing a voltage used for controlling said current regulator; and a measuring amplifier connected to one of said bridge diagonals, said measuring amplifier controlling a compensating current which in use flows in said compensating resistor; said current regulator and said Zener diode being connected in a series path which also includes the other of said bridge diagonals said series path having two ends respectively for connection to said two lines of said telemetering system.
Claim 3
Dependent Claim
126 words
A measuring-transducer circuit arrangement suitable for a two-line telemetering system, the circuit arrangement comprising: a first bridge circuit including a compensating resistor And having two bridge diagonals; a current regulator; a comparator circuit comprising a Zener diode forming a reference element for establishing a constant reference voltage and a reference-voltage resistor for developing a voltage used for controlling said current regulator; and a measuring amplifier connected to one of said bridge diagonals, said measuring amplifier controlling a compensating current which in use flows in said compensating resistor; said current regulator and said Zener diode being connected in a series path which also includes the other of said bridge diagonals said series path having two ends respectively for connection to said two lines of said telemetering system.
Claim 4
Dependent Claim
126 words
A measuring-transducer circuit arrangement suitable for a two-line telemetering system, the circuit arrangement comprising: a first bridge circuit including a compensating resistor And having two bridge diagonals; a current regulator; a comparator circuit comprising a Zener diode forming a reference element for establishing a constant reference voltage and a reference-voltage resistor for developing a voltage used for controlling said current regulator; and a measuring amplifier connected to one of said bridge diagonals, said measuring amplifier controlling a compensating current which in use flows in said compensating resistor; said current regulator and said Zener diode being connected in a series path which also includes the other of said bridge diagonals said series path having two ends respectively for connection to said two lines of said telemetering system.
Claim 5
Dependent Claim
91 words
A measuring-transducer circuit arrangement according to claim 1 wherein said comparator circuit is a second bridge circuit having two bridge diagonals, one of said bridge diagonals of said second bridge circuit being connected in series with said other bridge diagonal of said first bridge circuit, and further comprising two fixed resistors which, with said Zener diode and said reference-voltage resistor respectively form the four branches of said second bridge circuit, and a regulating amplifier for controlling said current regulator and connected across the other bridge diagonal of said second bridge circuit.
Claim 6
Dependent Claim
48 words
A measuring-transducer circuit arrangement according to claim 1 wherein said current regulator is disposed on that side of said first bridge circuit opposite said Zener diode, and is also adjacent to said compensating resistor and contained in a current loop through which in use said compensating current flows.
Claim 7
Dependent Claim
45 words
A measuring-transducer circuit arrangement according to claim 1 wherein in said first bridge circuit the two branches adjacent to one of the bridge terminals each comprise a fixed resistor, the third branch comprises a measuring sensor resistor, and the fourth branch comprises said compensating resistor.
Claim 8
Dependent Claim
48 words
A measuring-transducer circuit arrangement according to claim 1 wherein in said first bridge circuit the two branches adjacent to one of the bridge terminals comprise a fixed resistor, the third branch comprises a fixed resistor, and the fourth branch comprises said compensating resistor and a measuring sensor resistor.
Claim 9
Dependent Claim
61 words
A measuring-transducer circuit arrangement according to claim 5 wherein a compensating lead, branching from a point between said compensating resistor and said measuring sensor resistor in the fourth branch, connects with the collector-emitter path of a transistor, controlled by said measuring amplifier, and thence to a supply conductor on that side of said first bridge circuit remote from said current regulator.
Claim 10
Dependent Claim
19 words
A measuring-transducer circuit arrangement according to claim 1 wherein said current regulator comprises two transistors connected in Darlington configuration.
Claim 11
Dependent Claim
39 words
A measuring-transducer circuit arrangement according to claim 3 wherein said measuring amplifier is a differential amplifier comprising three transistors, and at least one diode bridged by a resistor is connected between said current regulator and said first bridge circuit.
Claim 12
Dependent Claim
41 words
A measuring-transducer circuit arrangement according to claim 1 wherein, in addition to the basic bridge current, a current which varies in the same or opposite sense with said compensating current is passed through at least part of said reference voltage resistor.
Claim 13
Dependent Claim
33 words
A measuring-transducer circuit arrangement according to claim 9 wherein said Zener diode and said reference-voltage resistor are in branches of said first bridge circuit that adjoin the connection adjacent to a supply conductor.
Claim 14
Dependent Claim
41 words
A measuring-transducer circuit arrangement according to claim 9 wherein, when a progressive measuring sensor resistor is used, at least part of said reference-voltage resistor lies in a compensating lead between a transistor and one of said lines of said telemetering system.
Claim 15
Dependent Claim
80 words
A measuring-transducer circuit arrangement according to claim 9 whereIn, when a progressive measuring sensor resistor is used, an additional resistor is connected between said current regulator and said first bridge circuit, and a lead, by-passing said first bridge circuit, runs from the connection point between said current regulator and said additional resistor, through a limiting resistor and at least part of reference-voltage resistor to said supply conductor on that side of said first bridge circuit remote from said current regulator.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |