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Title:
EARTH LEAKAGE DETERMINING DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/080111
Kind Code:
A1
Abstract:
An earth leakage determining device (20) for determining the presence or absence of an earth leakage between a direct-current power source (10) and a grounding portion (G1) is provided with: a detection resistance portion (31 to 33) having one end connected to the grounding portion; a first switch (S1) provided between the other end of the detection resistance portion and the positive electrode terminal of the direct-current power source; a second switch (S2) connected between the other end of the detection resistance portion and the negative electrode terminal of the direct-current power source; a charge/discharge element (51, 81, 82, Lx) and a third switch (S3) provided in a charge/discharge path (L3) connecting the grounding portion and the other end of the detection resistance portion; a control portion (40) for switching each switch on and off; and a determining portion (40) for acquiring the voltage of the detection resistance portion and determining the presence or absence of earth leakage on the basis of the acquired voltage of the detection resistance portion. The determining portion acquires the voltage to be used for determining the presence or absence of earth leakage after completion of an on-period of the third switch.

Inventors:
MIZOGUCHI TOMOMICHI (JP)
Application Number:
PCT/JP2021/034918
Publication Date:
April 21, 2022
Filing Date:
September 23, 2021
Export Citation:
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Assignee:
DENSO CORP (JP)
International Classes:
H02H7/20; G01R31/52
Foreign References:
JP2013033825A2013-02-14
CN108333429A2018-07-27
JP2004325382A2004-11-18
JP2006343267A2006-12-21
JP2016211978A2016-12-15
Attorney, Agent or Firm:
YAMADA, Tsuyoshi (JP)
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