Title:
CIRCUIT PROTECTION DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/176348
Kind Code:
A1
Abstract:
A circuit protection device (20) for protecting monitoring circuits (22) that monitor the voltage of a power source unit (1) is provided with: overvoltage protection elements (212) that are connected between a plurality of detection lines (M) connecting between the power source unit and the monitoring circuits and that undergo a short-circuit failure when an overvoltage has been applied; circuit protection elements (211) that are provided to each of the detection lines and cut off the electrical connection between the power source unit and the monitoring circuits when a current at or above a predetermined current value flows on the detection lines; and impedances (25) that are provided to at least one of the detection lines and are arranged at locations that are between the power source unit and the circuit protection elements. In the event of overvoltage, the overvoltage protection elements undergo a short-circuit failure and maintain a short-circuit state between detection lines, the circuit protection elements cut off the electrical connection between the power source unit and the monitoring circuits due to a short-circuit current flowing between the detection lines via the overvoltage protection elements; and the impedances suppress the generation of a discharge current when the short-circuit current causes the circuit protection elements to cut off the electrical connection between the power source unit and the monitoring circuits.
Inventors:
MIWA TOMOHIRO (JP)
KITAGAWA MASAAKI (JP)
KITAGAWA MASAAKI (JP)
Application Number:
PCT/JP2023/006494
Publication Date:
September 21, 2023
Filing Date:
February 22, 2023
Export Citation:
Assignee:
DENSO CORP (JP)
International Classes:
H02H3/20; H02H7/18; H02H9/04; H02J7/00
Domestic Patent References:
| WO2009110244A1 | 2009-09-11 | |||
| WO2022074985A1 | 2022-04-14 |
Foreign References:
| JP2014007883A | 2014-01-16 | |||
| JP2015228741A | 2015-12-17 | |||
| JP2008151682A | 2008-07-03 | |||
| US20040095249A1 | 2004-05-20 | |||
| US20120127619A1 | 2012-05-24 | |||
| US20170338648A1 | 2017-11-23 |
Attorney, Agent or Firm:
YAMADA, Tsuyoshi (JP)
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