Leakage current interrupter with sustained overvoltage...

Details Leakage current interrupter with sustained overvoltage... Leakage current interrupter with sustained overvoltage...

2007-11-06

2007-11-06

Leja, Ronald W. (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

Reexamination Certificate

active

10832412

ABSTRACT:
An appliance leakage current interrupter (ALCI) includes components for preventing sustained over-voltage and sustained over-current conditions. A current interruption threshold is inversely proportional to voltage supplied to the appliance. A microprocessor measures the voltage level of the incoming AC mains supply. The microprocessor is coupled to a sub-circuit for intentionally inducing a current mismatch between the two power lines monitored by the ALCI. Upon detecting an over-voltage of sufficient magnitude and duration, the microprocessor induces a current mismatch in the power lines, thereby causing the ALCI to interrupt power. A second current sensing transformer monitors one of the power lines. The microprocessor also receives the output of the second current sensing transformer. Upon detecting a current level exceeding a variable threshold, the microprocessor induces a current mismatch in the power lines and causes the ALCI to interrupt power.

REFERENCES:
patent: 5926355 (1999-07-01), Matsko et al.
patent: 6262871 (2001-07-01), Nemir et al.
patent: 7099130 (2006-08-01), Angle et al.
patent: 2005/0103613 (2005-05-01), Miller

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