Overcurrent breaking circuit
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United States of America Patent
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Jul 20, 1999
Grant Date -
N/A
app pub date -
Jan 12, 1998
filing date -
Jan 13, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
An overcurrent breaking circuit includes a semiconductor switch inserted in a main current path; a current detector circuit for detecting a current passing through the main current path; a logic circuit for switching off the semiconductor switch when the current detector circuit detects a current exceeding a set value for an overcurrent level; a first unit for prohibiting the logic circuit from performing an operation for switching off the semiconductor switch even if the current detector circuit detects a current exceeding the set value for a first short time period immediately after the semiconductor switch is switched from a breaking state to a conductive state; and a second unit for prohibiting the logic circuit from performing an operation for switching off the semiconductor switch for a second short time period even if the current detector circuit detects a current exceeding the set value when the semiconductor switch remains in a conductive state.
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