Overcurrent breaking circuit

Details Overcurrent breaking circuit Overcurrent breaking circuit

1998-01-12

1999-07-20

Wong, Peter S.

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

323908, G05F 110

Patent

active

059260106

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.

REFERENCES:
patent: 3775675 (1973-11-01), Freeze et al.
patent: 3914667 (1975-10-01), Waldron
patent: 4819117 (1989-04-01), Brennan et al.
patent: 5710690 (1998-01-01), Bontempo et al.
Patent Abstracts of Japan JP 1301432 (Hitachi) May 12, 1989.

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