| 摘要 |
An apparatus to perform parallel arc fault current interruption (AFCI). The apparatus includes a current sensing device (10) disposed in the electrical circuit to sense an electrical load, the current sensing device (10) configured to produce an output signal representative of a load current passing therethrough, a detection unit (302), in signal communication with the current sensing device and configured to receive the output signal produced by the current sensing device, the detection unit (302) being configured and disposed to output a secondary signal based on the output signal, and a microcontroller (306) coupled to the detection unit (302), being responsive to computer executable instructions which, when executed by the microcontroller (306), cause the microcontroller (306) to receive and to decompose the secondary signal via discrete wavelet transforms to thereby obtain discrete wavelet coefficients, and to compute a sum of the discrete wavelet coefficients, and to compare the sum of the discrete wavelet coefficients to a predetermined threshold, and to generate a trip signal when the sensed load current is above a predetermined threshold and the sum of the discrete wavelet coefficients cooperatively indicate that predetermined threshold conditions for trip signal generation are satisfied |
