Title:
IMPEDANCE MEASURING DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/127478
Kind Code:
A1
Abstract:
This impedance measuring device (1) comprises a switching circuit (4) for forming a loop circuit (Lp) together with a battery (Bt), a current measurement unit (3) connected to a path for linking the battery (Bt) and the switching circuit (4), and voltage-measuring equipment (2) connected to both ends of the battery (Bt). The switching circuit (4) generates a current (i1, i2) that flows intermittently from the battery (Bt) to the loop circuit (Lp). The impedance measuring device (1) sweeps the frequency of an AC current flowing from the battery (Bt) by changing between times when the current (i1, i2) is intermittently flowing and times when the current (i1, i2) is not flowing, and derives the AC impedance of the battery (Bt) by measuring the AC current using the current measurement unit (3) and measuring an AC voltage of the battery (Bt) using the voltage-measuring equipment (2).
Inventors:
MIHASHI TETSUYA
ISHII TAKUYA
ISHII TAKUYA
Application Number:
PCT/JP2022/045763
Publication Date:
July 06, 2023
Filing Date:
December 13, 2022
Export Citation:
Assignee:
NUVOTON TECH CORPORATION JAPAN (JP)
International Classes:
G01R27/02; G01R31/389
Domestic Patent References:
| WO2020003841A1 | 2020-01-02 |
Foreign References:
| US20070132456A1 | 2007-06-14 | |||
| JP2010169527A | 2010-08-05 | |||
| US20170160348A1 | 2017-06-08 |
Attorney, Agent or Firm:
NII, Hiromori et al. (JP)
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