Current leakage breaking circuit for a copying apparatus

Details Current leakage breaking circuit for a copying apparatus Current leakage breaking circuit for a copying apparatus

1991-06-11

1993-07-27

Pellinen, A. D.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

355202, 355206, 361 45, 361 42, H02H 308, H02H 328

Patent

active

052313093

ABSTRACT:
An earth current leakage breaking circuit detects a current leakage in an AC line in a copying apparatus and breaks electrically the AC line. The circuit has a current difference detector which detects a difference in current between an incoming current and an outgoing current in AC lines which supply electric power from an AC power source to electrical loads in the apparatus. A control circuit which, when it detects an output signal from the current difference detector which continuously exceeds a reference level, turns off a relay provided to the AC lines. The control circuit has a timing generator which generates timings to start driving the loads, and a reference level generator which generates the reference level being variable in accordance with the generated timings.

REFERENCES:
patent: 4320433 (1982-03-01), Yamaki
patent: 4996625 (1991-02-01), Soma et al.

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