Title:
LOAD CIRCUIT PROTECTION DEVICE
Document Type and Number:
Japanese Patent JP2015037940
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a load circuit protection device capable of reduction in sizes of an electric wire and a semiconductor switch by using a switch circuit simulating a fuse.SOLUTION: Upon setting a permissible temperature of an electric wire to a simulated permissible temperature lower than an actual temperature, and changing a heat resistance R used in a heat generation temperature arithmetic formula and a heat radiation temperature arithmetic formula to a simulated heat resistance R*, a calorific value and a radiation amount of the electric wire are calculated and a current temperature of the electric wire is estimated. If this estimated temperature reaches the simulated permissible temperature, an electronic switch S1 is turned off to protect a load circuit. As a result, both the electric wire and the semiconductor switch used in the load circuit can be protected from overheat.
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Inventors:
NAKAMURA YOSHIHIDE
MARUYAMA AKINORI
UEDA KEISUKE
MARUYAMA AKINORI
UEDA KEISUKE
Application Number:
JP2014198323A
Publication Date:
February 26, 2015
Filing Date:
September 29, 2014
Export Citation:
Assignee:
YAZAKI CORP
International Classes:
B60R16/02; H02H3/087; H02H3/093; H02H5/04; H02H6/00
Domestic Patent References:
| JP2003220908A | 2003-08-05 | |||
| JP2008289297A | 2008-11-27 |
Foreign References:
| WO2009066564A1 | 2009-05-28 |
Attorney, Agent or Firm:
Hidekazu Miyoshi
Yukikuni Iwasaki
Toshikazu Takahashi
Masakazu Ito
Toshio Takamatsu
Yukikuni Iwasaki
Toshikazu Takahashi
Masakazu Ito
Toshio Takamatsu
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