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Title:
SIGNAL INJECTION DEVICE AND IMPEDANCE MEASUREMENT DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/249708
Kind Code:
A1
Abstract:
Provided is a signal injection device capable of reliably injecting an AC signal to an injection target line in which a direct current is flowing.　A signal injection device 10 includes: a ring-shaped magnetic core 2 into which is inserted an injection target line L, in which a direct current Ib is flowing; and a signal injection unit 3 that generates an AC signal S1 to be injected to the injection target line L and that injects the AC signal S1 to the injection target line L. The signal injection device 10 further includes a magnetic-flux cancellation unit 4 that supplies, to a magnetic-flux cancellation winding W1 wound around the magnetic core 2, a cancel current Ic that generates a magnetic flux Md for cancelling a magnetic flux Mb generated in the magnetic core 2 due to the fact that the direct current Ib flows in the injection target line L, which is inserted into the magnetic core 2.

Inventors:
HOTTA AKINORI (JP)
TOYA HIROYUKI (JP)
IKEDA HIROYOSHI (JP)
KASAI SHIN (JP)
SAKAI TOMOHARU (JP)
TSUKIOKA YASUYUKI (JP)
YANAGISAWA KOICHI (JP)
Application Number:
PCT/JP2022/014238
Publication Date:
December 01, 2022
Filing Date:
March 25, 2022
Export Citation:
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Assignee:
HIOKI ELECTRIC WORKS (JP)
International Classes:
G01R27/02; G01R15/18; G01R15/20; G01R31/389
Domestic Patent References:
WO2014010187A12014-01-16
WO2014104188A12014-07-03
Foreign References:
JPH07110345A1995-04-25
JP2019204158A2019-11-28
JP2016188790A2016-11-04
JP2018126006A2018-08-09
JP2012108007A2012-06-07
JP2012113884A2012-06-14
Attorney, Agent or Firm:
SAKAI Shinji (JP)
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