A pressure sensor comprises a deformable substrate, at least one coil supported by the substrate and responsive to a changing coil drive signal to produce a changing magnetic field, a fluid chamber having a first wall formed by the substrate and a second wall formed by a conductive material and positioned proximate to the at least one coil so that the changing magnetic field produces eddy currents within the conductive material that generate a reflected magnetic field, and at least one magnetic field sensing element configured to detect the reflected magnetic field and produce a signal responsive to a distance between the magnetic field sensing element and the second wall. The substrate is deformable by fluid pressure within the fluid chamber and the deformation of the substrate changes the distance between the magnetic field sensing element and the second wall.

A pressure sensor comprises a deformable substrate, at least one coil supported by the substrate and responsive to a changing coil drive signal to produce a changing magnetic field, a fluid chamber having a first wall formed by the substrate and a second wall formed by a conductive material and positioned proximate to the at least one coil so that the changing magnetic field produces eddy currents within the conductive material that generate a reflected magnetic field, and at least one magnetic field sensing element configured to detect the reflected magnetic field and produce a signal responsive to a distance between the magnetic field sensing element and the second wall. The substrate is deformable by fluid pressure within the fluid chamber and the deformation of the substrate changes the distance between the magnetic field sensing element and the second wall.

A water bag pressure detection device, a water bag inflow control device and a water bag type water purifier are provided. The water bag pressure detection device includes: a base seat defining an airtight cavity therein, and having an upper end provided with a mounting opening; a pressure sensor module having at least a lower portion disposed in the airtight cavity and connected with a circumferential edge of the mounting opening in a sealing manner, an inductive head of the pressure sensor module being configured to abut against a lower portion of the water bag; and a ventilation member defining a ventilation passage therein and disposed to the base seat, the ventilation passage being provided with a balancing seal member configured to move in the ventilation passage along with variations of pressure in the airtight cavity and outside pressure.

A water bag pressure detection device, a water bag inflow control device and a water bag type water purifier are provided. The water bag pressure detection device includes: a base seat defining an airtight cavity therein, and having an upper end provided with a mounting opening; a pressure sensor module having at least a lower portion disposed in the airtight cavity and connected with a circumferential edge of the mounting opening in a sealing manner, an inductive head of the pressure sensor module being configured to abut against a lower portion of the water bag; and a ventilation member defining a ventilation passage therein and disposed to the base seat, the ventilation passage being provided with a balancing seal member configured to move in the ventilation passage along with variations of pressure in the airtight cavity and outside pressure.

Device for measuring pressure comprising a base body, and a diaphragm that is arranged on the base body such that the base body and the diaphragm at least partially enclose a cavity, wherein the diaphragm is embodied to be deformable in accordance with the external pressure incident on it, such that the magnitude of a spatial dimension of the cavity is correspondingly changed, wherein a position element is arranged to move in accordance with the diaphragm, wherein an inductive planar coil is arranged across the cavity and opposite to the position element, such that the position element and the inductive planar coil are separated, wherein the position element serves to influence the inductance of the coil in dependence on the magnitude of the separation.

Device for measuring pressure comprising a base body, and a diaphragm that is arranged on the base body such that the base body and the diaphragm at least partially enclose a cavity, wherein the diaphragm is embodied to be deformable in accordance with the external pressure incident on it, such that the magnitude of a spatial dimension of the cavity is correspondingly changed, wherein a position element is arranged to move in accordance with the diaphragm, wherein an inductive planar coil is arranged across the cavity and opposite to the position element, such that the position element and the inductive planar coil are separated, wherein the position element serves to influence the inductance of the coil in dependence on the magnitude of the separation.

A water bag pressure detection device (100), a water bag inflow control device (1000) and a water bag type water purifier are provided. The water bag pressure detection device (100) includes: a base seat (10) defining an airtight cavity (101) therein, and having an upper end provided with a mounting opening; a pressure sensor module (20) having at least a lower portion disposed in the airtight cavity (101) and connected with a circumferential edge of the mounting opening in a sealing manner, an inductive head (22) of the pressure sensor module being configured to abut against a lower portion of the water bag; and a ventilation member (30) defining a ventilation passage (301) therein and disposed to the base seat, the ventilation passage (301) being provided with a balancing seal member (40) configured to move in the ventilation passage (301) along with variations of pressure in the airtight cavity (101) and outside pressure.

A water bag pressure detection device (100), a water bag inflow control device (1000) and a water bag type water purifier are provided. The water bag pressure detection device (100) includes: a base seat (10) defining an airtight cavity (101) therein, and having an upper end provided with a mounting opening; a pressure sensor module (20) having at least a lower portion disposed in the airtight cavity (101) and connected with a circumferential edge of the mounting opening in a sealing manner, an inductive head (22) of the pressure sensor module being configured to abut against a lower portion of the water bag; and a ventilation member (30) defining a ventilation passage (301) therein and disposed to the base seat, the ventilation passage (301) being provided with a balancing seal member (40) configured to move in the ventilation passage (301) along with variations of pressure in the airtight cavity (101) and outside pressure.

Disclosed is a pressure detection device (10), wherein the pressure detection device (10) is configured to detect the pressure in a sealed cavity. The pressure detection device (10) further comprises: a pressure sensing assembly (I), wherein the pressure sensing assembly (I) comprises a fixed part (14) and a movable part (13), the movable part (13) moves relative to the fixed part (14) when a change of the pressure in the sealed cavity is sensed, so as to change a sensing parameter of the pressure sensing assembly (I); and a detection unit (II), wherein the detection unit (II) is connected to the pressure sensing assembly (I), and the detection unit (II) is used for obtaining the pressure in the sealed cavity according to a current sensing parameter of the pressure sensing assembly (I).

The present invention relates to a half-bridge signal processing circuit comprising a first and a second branch. The first branch comprises a first stimulus responsive sense element and a first current source arranged to provide a current to the first sense element. The second branch comprises a second stimulus responsive sense element and a second current source arranged to provide a current to said second sense element. The first and the second branch have a terminal in common. The first branch comprises a first node between said the current source and the first stimulus responsive sense element configured to generate a first signal related to a voltage over the first sense element. The second branch comprises a second node between the second current source and the second stimulus responsive sense element configured to generate a second signal related to a voltage over the second sense element.