IP Library › Granted Patent US 12680838
Granted Patent B2
US 12680838 · App. 18/457,181 · Granted Jul 14, 2026

Inductive position transducer system with impedance circuit portion

Inventor: Bjorn Erik Bertil Jansson (Snohomish, WA)
Assignee: Mitutoyo Corporation
G01D5/2208G01B7/003
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Quick Facts
Patent No.
US 12680838
App. No.
18/457,181
Granted
Jul 14, 2026
Kind
B2
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).

Claims (47)

1 . 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.

2 . The system of claim 1 , wherein the first sensing coil portion comprises a sensing coil which comprises the first coil terminal, the second coil terminal and the coil impedance.

3 . The system of claim 2 , wherein the sensing coil comprises an inductive portion and a resistive portion.

4 . The system of claim 1 , wherein the input impedance of the input circuit portion comprises the impedance of an input circuit portion component that is coupled between the first impedance circuit portion node and the second impedance circuit portion node.

5 . The system of claim 4 , wherein the input circuit portion component comprises a resistor.

6 . The system of claim 1 , wherein the second impedance circuit portion component is coupled between the first impedance circuit portion node and the second impedance circuit portion node.

7 . The system of claim 6 , wherein the impedance circuit portion further comprises a third impedance circuit portion component that is coupled between the first coil terminal and the first impedance circuit portion node.

8 . The system of claim 7 , wherein the third impedance circuit portion component comprises a capacitor.

9 . The system of claim 1 , wherein the first impedance circuit portion component comprises one of a capacitor or an inductor.

10 . The system of claim 9 , wherein the first impedance circuit portion component comprises a capacitor.

11 . The system of claim 9 , wherein the second impedance circuit portion component comprises one of a capacitor, an inductor or a resistor.

12 . The system of claim 11 , wherein the second impedance circuit portion component comprises a resistor.

13 . The system of claim 12 , wherein the first impedance circuit portion component comprises a capacitor and the second impedance circuit portion component is coupled between the first impedance circuit portion node and the second impedance circuit portion node.

14 . The system of claim 1 , wherein 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.

15 . The system of claim 14 , wherein one or more impedance circuit portion components of the impedance circuit portion are configured for the eliminating of the majority of the reactance of the inductive portion of the first sensing coil portion.

16 . 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.

17 . The sensing circuit portion of claim 16 , wherein the second impedance circuit portion component is coupled between the first impedance circuit portion node and the second impedance circuit portion node.

18 . The sensing circuit portion of claim 17 , wherein the impedance circuit portion further comprises a third impedance circuit portion component that is coupled between the first coil terminal and the first impedance circuit portion node.

19 . 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 comprising a capacitor, 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 comprising a resistor, wherein the second impedance circuit portion component is coupled between the first impedance circuit portion node and the second 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.

20 . The sensing circuit portion of claim 19 , wherein the impedance circuit portion further comprises a third impedance circuit portion component that comprises a capacitor and that is coupled to the first impedance circuit portion node.