Pressure sensor and pressure sensing method
AssigneeAcer Incorporated
InventorJin-Ting Kuo
Life of this patent
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Abstract
A pressure sensor, comprises a first electrode plate; a plurality of second electrode plates; an elastic member, disposed between the first electrode plate and the plurality of second electrode plates; a first switch, comprising a first end coupled to the first electrode plate, and a second end selectively coupled to a first plate receiving end or a ground; and a plurality of second switches, wherein each second switch comprises a first end coupled to one of the plurality of second electrode plates, and a second end selectively coupled to a second plate receiving end, the ground or a driving signal end.
Claims10
A pressure sensor, comprising:
- a first electrode plate;
- a plurality of second electrode plates;
- an elastic member, disposed between the first electrode plate and the plurality of second electrode plates;
- a first switch, comprising a first end coupled to the first electrode plate, and a second end selectively coupled to a first plate receiving end or a ground;
- a plurality of second switches, wherein each second switch comprises a first end coupled to one of the plurality of second electrode plates, and a second end selectively coupled to a second plate receiving end, the ground or a driving signal end;
- and
- a processing unit, coupled to the first plate receiving end, wherein within a testing duration, the processing unit sets up a plate connection configuration, and when different forces are applied on the first electrode plate, the processing unit detects a capacitance of the first electrode plate corresponding to different forces and detects a compressed electrode area according to the plate connection configuration.
A pressure sensor, comprising:
- a first electrode plate;
- a plurality of second electrode plates;
- an elastic member, disposed between the first electrode plate and the plurality of second electrode plates;
- a first switch, comprising a first end coupled to the first electrode plate, and a second end selectively coupled to a first plate receiving end or a ground;
- a plurality of second switches, wherein each second switch comprises a first end coupled to one of the plurality of second electrode plates, and a second end selectively coupled to a second plate receiving end, the ground or a driving signal end;
- a control unit, for generating a control signal to control the first switch and the plurality of second switches;
- a driving unit, coupled to the driving signal end, for generating a driving signal;
- and
- a processing unit, coupled to the first plate receiving end, for receiving a first sensing signal through the first plate receiving end within a normal operation duration and accordingly determining a first capacitance corresponding to a first force;
- wherein, within the normal operation duration, the control unit generates the control signal according to a plate connection configuration, the plate connection configuration comprises at least a part of the plurality of second electrode plates coupled to the ground or to be at a floating state and the remaining part of the second electrode plates coupled to the driving signal end,
- wherein within the normal operation duration, the first end of the first switch is coupled to the first electrode plate and the second end of the first switch is coupled to the first plate receiving end according to the control signal, and the second end of at least a part of the plurality of second switches are coupled to the ground or at the floating state and the second end of the remaining part of the second switches are coupled to the driving signal end according to the control signal and the plate connection configuration, so as to connect the corresponding second electrode plates to the driving signal end,
- wherein within a testing duration, the processing unit sets up the plate connection configuration, and when different forces are applied on the first electrode plate, the processing unit detects a capacitance of the first electrode plate corresponding to different forces and detects a compressed electrode area according to the plate connection configuration.
A pressure sensing method, applied for a pressure sensor, the pressure sensor comprises an elastic member, a first electrode plate and a plurality of second electrode plates, the elastic member is disposed between the first electrode plate and the plurality of second electrode plates, the pressure sensing method comprises:
- setting up a plate connection configuration, the plate connection configuration comprises at least a part of the plurality of second electrode plates connected to a ground or switched to a floating state and the remaining second electrode plates connected to a driving signal end;
- and
- applying different forces on the first electrode plate, and detecting the first capacitance and the compressed electrode area corresponding to different forces according to the plate connection configuration;
- and
- storing the plate connection configuration and the corresponding relationship between the first capacitance and area of the compressed electrode of the plate connection configuration based on the plate connection configuration corresponding to different forces.
Dependencies are inferred from the claim text.