US 12,680,838 B2Granted

Inductive position transducer system with impedance circuit portion

AssigneeMitutoyo Corporation

InventorBjorn Erik Bertil Jansson

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Abstract

An inductive position transducer system is provided, including an inductive position transducer and one or more sensing circuit portions. Each sensing circuit portion is connected to first and second sensing coil terminals and is configured to receive a signal from a respective sensing coil and comprises an impedance circuit portion and an input circuit portion (e.g., of an ASIC). The impedance circuit portion comprises at least first and second impedance circuit portion components. The first impedance circuit portion component is coupled between first and second impedance circuit portion nodes. The second impedance circuit portion component is at least one of: coupled between the first coil terminal and the first impedance circuit portion node; or coupled between the first impedance circuit portion node and the second impedance circuit portion node (for which a third impedance circuit portion component may also be provided in some implementations).

Claims20

Dependent claims

An inductive position transducer system, comprising:

an inductive position transducer comprising a first sensing coil portion having a first coil terminal, a second coil terminal and a coil impedance;
and
a sensing circuit portion configured to receive a first sensing coil signal from the first sensing coil portion, the sensing circuit portion comprising:
an impedance circuit portion connected to the first and second coil terminals, the impedance circuit portion comprising:
a first impedance circuit portion component, wherein the first impedance circuit portion component is coupled between a first impedance circuit portion node and a second impedance circuit portion node;
and
a second impedance circuit portion component, which is at least one of:
coupled between the first impedance circuit portion node and the second impedance circuit portion node;
or
coupled between the first coil terminal and the first impedance circuit portion node;
and
an input circuit portion connected to the first and second impedance circuit portion nodes, the input circuit portion having an input impedance during operation, wherein the input circuit portion is configured to receive an oscillating sensing signal at the first and second impedance circuit portion nodes;
wherein:
a combined impedance portion comprising at least the impedance circuit portion and the first sensing coil portion has a combined impedance presented to the input circuit portion during operation;
and
the inductive position transducer system is configured such that at least one of:
the first sensing coil portion comprises an inductive portion that has an associated reactance during operation that would otherwise be presented to the input circuit portion but for which a majority of the reactance is eliminated in the combined impedance as a result of the inclusion of the impedance circuit portion in the combined impedance portion;
or
the first impedance circuit portion component comprises a capacitor and the second impedance circuit portion component comprises a resistor and is coupled between the first impedance circuit portion node and the second impedance circuit portion node.

16 more elements

A sensing circuit portion for inclusion in an inductive position transducer system comprising a first sensing coil portion having a first coil terminal, a second coil terminal and a coil impedance, the sensing circuit portion comprising:

an impedance circuit portion connected to the first and second coil terminals, the impedance circuit portion comprising:
a first impedance circuit portion component, wherein the first impedance circuit portion component is coupled between a first impedance circuit portion node and a second impedance circuit portion node;
and
a second impedance circuit portion component which is at least one of:
coupled between the first impedance circuit portion node and the second impedance circuit portion node;
or
coupled between the first coil terminal and the first impedance circuit portion node;
and
an input circuit portion connected to the first and second impedance circuit portion nodes, the input circuit portion having an input impedance during operation, wherein the input circuit portion is configured to receive an oscillating sensing signal at the first and second impedance circuit portion nodes;
wherein:
a combined impedance portion comprising at least the impedance circuit portion and the first sensing coil portion has a combined impedance presented to the input circuit portion during operation;
and
the first sensing coil portion comprises an inductive portion that has an associated reactance during operation that would otherwise be presented to the input circuit portion but for which a majority of the reactance is eliminated in the combined impedance as a result of the inclusion of the impedance circuit portion in the combined impedance portion.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/457,181Filed 28 Aug 2023
Published: US 2025/0076086 A16 Mar 2025
Granted: 14 Jul 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G01D 5/2208
Differentially influencing two coils: by influencing the self-induction of the coils
G01B 7/003
Measuring arrangements characterised by the use of electric or magnetic techniques: for measuring position, not involving coordinate determination
G01D 5/2053
By influencing the mutual induction between two or more coils: by a movable non-ferromagnetic conductive element
G01D
Measuring not specially adapted for a specific variable