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Patent Searching and Data


Title:
ELECTRONIC BREAKER
Document Type and Number:
Japanese Patent JP2010092623
Kind Code:
A
Abstract:

To prevent secondary damage caused by runaway of a CPU by assuring fail-safe of the CPU in an electronic breaker.

A CPU monitoring circuit 22 monitors the operation of the CPU 18 based on a periodical pulse output by the CPU 18. When the CPU 18 runs away, and the periodical pulse stops, the monitoring circuit 22 outputs a reset signal to the CPU 18 and a trip coil driving circuit 21. The CPU 18 responds to the reset signal to initialize it, and when it can not be initialized, a drive circuit 21 drives a trip coil 10 to open a main contact 9. When the control program of the CPU 18 is written in a flush ROM 24, a switch 26 is opened to interrupt the reset signal from the monitoring circuit 22 to the CPU 18. The monitoring circuit 22 is made to output the reset signal, and the response of the trip coil 10 to the reset signal is observed to confirm return failure of the switch 26.


Inventors:
KONISHI KOJI
YAMATO TAKASHI
NAKAGAWA TOSHIYUKI
Application Number:
JP2008258815A
Publication Date:
April 22, 2010
Filing Date:
October 03, 2008
Export Citation:
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Assignee:
KAWAMURA ELECTRIC INC
International Classes:
H01H83/02
Domestic Patent References:
JPH05250978A1993-09-28
Attorney, Agent or Firm:
Mizuno Yuuki