Title:
LOAD DETECTING DEVICE AND DETECTING CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2024/070102
Kind Code:
A1
Abstract:
A load detecting device (3) comprises a load sensor (1) provided with an element portion having an electrostatic capacitance that changes in accordance with a load, and detecting circuit (2) for detecting the electrostatic capacitance of the element portion. The detecting circuit (2) comprises: an electric potential applying unit (100) for applying a prescribed electric potential to both electrodes of the element portion; an electric current measuring unit (200) for measuring an electrical quantity (electric current) that varies depending on charging or discharging of electric charge to or from the element portion; and a control unit (300). The control unit (300): acquires an amount of charge Qm from an electric current Im measured in a first mode in which different electric potentials are applied to the two electrodes; acquires an amount of charge Qref from an electric current Iref measured in a second mode in which the same electric potential is applied to the two electrodes; and detects the electrostatic capacitance of the element portion from a difference between the amount of charge Qm and the amount of charge Qref.
Inventors:
TAMARU MASAKI
Application Number:
PCT/JP2023/024091
Publication Date:
April 04, 2024
Filing Date:
June 28, 2023
Export Citation:
Assignee:
PANASONIC IP MAN CO LTD (JP)
International Classes:
G01L1/14; G01L5/00
Attorney, Agent or Firm:
SHIBANO, Masanori et al. (JP)
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