Leakage current detection device for appliances

摘要

A leakage current detection device includes a self-test pulse generating unit, for generating a pulsed triggering signal when the leakage current detection device is initially energized; a self-test unit, for periodically generating simulated leakage current signals, and generating a simulated leakage current signal based on the pulsed triggering signal; and a leakage current detection unit, for detecting the simulated leakage current and actual leakage current faults. An electrical connection device incorporating the leakage current detection device is also disclosed. By providing the self-test pulse generating unit, the self-test unit can be triggered immediately after the device is initially energized to perform a self test, which prevents faults and unsafe conditions before periodic self test starts. By providing a discharge unit, the leakage current detection device is prevented form performing self test under low voltage conditions and accidental tripping can be avoided.

主权项

1. A leakage current detection device comprising:
a self-test pulse generating unit, for generating a pulsed triggering signal when the leakage current detection device is initially energized; a self-test unit, for periodically generating simulated leakage current signals, and for generating a simulated leakage current signal based on the pulsed triggering signal; and leakage current detection unit, for detecting the simulated leakage current and actual leakage current faults, wherein the self-test unit includes: a reference voltage generating sub-unit, for generating a reference voltage; a periodic voltage generating sub-unit, for generating a periodically varying voltage, which is below the reference voltage during some parts of each period and above the reference voltage during other parts of each period; a comparator, for comparing the reference voltage and the periodically varying voltage; and a first switching element, for generating a simulated leakage current signal based on a comparison result output by the comparator.