Systems and assemblies associated with a flexible printed circuit board with coils printed thereon for indicating position of a movable member

Patent metadata

Field	Value
Publication number	US-12484150-B2
Application number	US-202418430966-A
Country	US
Kind code	B2
Filing date	Feb 2, 2024
Priority date	Feb 8, 2023
Publication date	Nov 25, 2025
Grant date	Nov 25, 2025

Abstract

An example assembly includes: a housing; a movable member configured to move within the housing; and a coil flexible printed circuit board (FPCB) wrapped around the housing, wherein the coil FPCB comprises: at least one excitation coil printed on the coil FPCB as a conductive track, wherein the excitation coil is configured to generate a magnetic field when an electric current is provided through the conductive track, and at least one sensing coil printed on the coil FPCB as a respective conductive track, wherein the magnetic field generated by the excitation coil is configured to induce a respective electric current in the at least one sensing coil, and wherein movement of the movable member within the housing changes a parameter associated with the respective electric current, thereby indicating a position of the movable member.

First claim

What is claimed is:

1 . An assembly comprising:
a housing; a movable member configured to move within the housing; and a coil flexible printed circuit board (FPCB) wrapped around the housing, wherein the coil FPCB comprises:
at least one excitation coil printed on the coil FPCB as a conductive track, wherein the at least one excitation coil is configured to generate a magnetic field when an electric current is provided through the conductive track, and
at least one sensing coil printed on the coil FPCB as a respective conductive track, wherein the magnetic field generated by the at least one excitation coil is configured to induce a respective electric current in the at least one sensing coil, and wherein movement of the movable member within the housing changes a parameter associated with the respective electric current in either the at least one excitation coil or the at least one sensing coil, thereby indicating a position of the movable member.

2 . The assembly of claim 1 , wherein the at least one excitation coil is printed on the coil FPCB as a spiral conductive track.

3 . The assembly of claim 2 , wherein the spiral conductive track is a rectangular spiral conductive track.

4 . The assembly of claim 1 , wherein the at least one sensing coil comprises:
a first sensing coil that is laterally-disposed from the at least one excitation coil on a first side of the at least one excitation coil; and a second sensing coil that is laterally-disposed from the at least one excitation coil on a second side of the at least one excitation coil, opposite the first side, such that the at least one excitation coil is a central coil interposed between the first sensing coil and the second sensing coil, wherein as the movable member moves within the housing, a differential signal between the first sensing coil and the second sensing coil indicates the position of the movable member.

5 . The assembly of claim 4 , wherein the at least one excitation coil extends along a length of the coil FPCB and is wrapped around the housing therewith, wherein the first sensing coil and the second sensing coil extend along the length of the coil FPCB and are wrapped around the housing therewith, wherein the movable member is configured to move linearly within the housing, and wherein the differential signal indicates a linear position of the movable member within the housing.

6 . The assembly of claim 1 , wherein the at least one sensing coil comprise:
a first plurality of sensing coils laterally-disposed from the at least one excitation coil on a first side of the at least one excitation coil; and a second plurality of sensing coils laterally-disposed from the at least one excitation coil on a second side of the at least one excitation coil, opposite the first side, such that the at least one excitation coil is a central coil interposed between the first plurality of sensing coils and the second plurality of sensing coils, wherein each coil of the first plurality of sensing coils and of the second plurality of sensing coils is formed as a spiral conductive track, wherein the movable member is rotatable within the housing, and wherein a differential signal between coils of the first plurality of sensing coils and respective coils of the second plurality of sensing coils indicates a rotary position of the movable member within the housing.

7 . The assembly of claim 1 , wherein the conductive track of the at least one excitation coil forms multiple layers within the coil FPCB, and wherein the respective conductive track of the at least one sensing coil forms respective multiple layers within the coil FPCB.

8 . The assembly of claim 1 , wherein the coil FPCB is wrapped more than one time around the housing.

9 . The assembly of claim 1 , further comprising:
a processing FPCB that is coupled to the coil FPCB, wherein the processing FPCB comprises a conditioning and sensing circuitry electrically coupled to the conductive track of the at least one excitation coil and the respective conductive track of the at least one sensing coil.

10 . The assembly of claim 9 , wherein the processing FPCB comprises multiple segments, such that as the coil FPCB is wrapped around the housing, the processing FPCB is wrapped therewith, thereby forming a polygonal shape having flat sides on which electronic components of the conditioning and sensing circuitry are mounted.

11 . The assembly of claim 1 , wherein the conductive track of the at least one excitation coil differs from the respective conductive track of the at least one sensing coil.

12 . A valve comprising:
a housing; a plurality of ports comprising: a first port and a second port; a poppet that is movable relative to the housing; a spring applying a spring force on the poppet; a movable member disposed within the housing and coupled to the poppet; and a coil flexible printed circuit board (FPCB) wrapped around the housing, wherein the coil FPCB comprises: (i) at least one excitation coil printed on the coil FPCB as a conductive track, wherein the at least one excitation coil is configured to generate a magnetic field when an electric current is provided through the conductive track, and (ii) at least one sensing coil printed on the coil FPCB as a respective conductive track, wherein the magnetic field generated by the at least one excitation coil is configured to induce a respective electric current in the at least one sensing coil, wherein fluid provided to the first port pushes the poppet against the spring, thereby opening a flow path between the first port and the second port, wherein movement of the movable member with the poppet within the housing changes a parameter associated with the respective electric current, thereby indicating a position of the movable member and the poppet.

13 . The valve of claim 12 , further comprising:
a sensor carrier mounted to the housing, wherein the coil FPCB is wrapped around the sensor carrier.

14 . The valve of claim 12 , further comprising:
a sensor housing threadedly engaged with the housing of the valve, such that an axial position of the sensor housing is adjustable relative to the housing, wherein adjusting the axial position of the sensor housing moves the coil FPCB relative to the movable member for calibration.

15 . The valve of claim 12 , wherein the at least one excitation coil is printed on the coil FPCB as a rectangular spiral conductive track.

16 . The valve of claim 12 , wherein the at least one sensing coil comprises:
a first sensing coil that is laterally-disposed from the at least one excitation coil on a first side of the at least one excitation coil; and a second sensing coil that is laterally-disposed from the at least one excitation coil on a second side of the at least one excitation coil, opposite the first side, such that the at least one excitation coil is a central coil interposed between the first sensing coil and the second sensing coil, wherein as the movable member moves within the housing, a differential signal between the first sensing coil and the second sensing coil indicates the position of the movable member.

17 . The valve of claim 16 , wherein the at least one excitation coil extends along a length of the coil FPCB and is wrapped around the housing therewith, wherein the first sensing coil and the second sensing coil extend along the length of the coil FPCB and are wrapped around the housing therewith, wherein the movable member is configured to move linearly within the housing, and wherein the differential signal indicates a linear posit

Assignees

• Sun Hydraulics Llc

Inventors

• Kaufmann Jonathan
• Kaufmann Benjamin
• Flores Alexander
• Shaw Allison

Classifications

• H05K1/165

  incorporating printed inductors · CPC title

• H05K1/028

  Bending or folding regions of flexible printed circuits (H05K1/0283 takes precedence) · CPC title

• G01D5/2053

  by a movable non-ferromagnetic conductive element · CPC title

• F15B2013/0409

  Position sensing or feedback of the valve member · CPC title

• G01D2205/18

  using magnetic means not otherwise provided for in this subclass · CPC title