Arc detection using discrete wavelet transforms
First Claim
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1. An apparatus to perform series and parallel arc fault current interruption (AFCI), the apparatus comprising:
- a current sensing device configured to sense an electrical load current, the current sensing device being further configured to produce an output signal representative of the electrical load current;
a first detection unit configured to output a first signal based on the output signal; and
a microcontroller configured to decompose at least the first signal via discrete wavelet transforms to thereby obtain discrete wavelet coefficients by which parallel and series arc are identified, and to generate a trip signal when the discrete wavelet coefficients indicate that a threshold condition for trip signal generation is satisfied.
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Abstract
An apparatus to perform series and parallel arc fault current interruption (AFCI). The apparatus includes a resistive element configured to sense a load from which a current signal is generated, a first detection unit configured to output a first signal based on the current signal, and a microcontroller configured to decompose at least the first signal via discrete wavelet transforms to thereby obtain discrete wavelet coefficients, and to generate a trip signal when the discrete wavelet coefficients indicate that a threshold condition for trip signal generation are satisfied.
149 Citations
18 Claims
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1. An apparatus to perform series and parallel arc fault current interruption (AFCI), the apparatus comprising:
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a current sensing device configured to sense an electrical load current, the current sensing device being further configured to produce an output signal representative of the electrical load current; a first detection unit configured to output a first signal based on the output signal; and a microcontroller configured to decompose at least the first signal via discrete wavelet transforms to thereby obtain discrete wavelet coefficients by which parallel and series arc are identified, and to generate a trip signal when the discrete wavelet coefficients indicate that a threshold condition for trip signal generation is satisfied. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus to perform series and parallel arc fault current interruption (AFCI), the apparatus comprising:
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a resistive element configured to sense a load from which a current signal is generated; a series arc detection unit configured to output a series arc detection signal based on the current signal; a parallel arc detection unit electrically disposed in parallel with the series arc detection unit and configured to output a parallel arc detection signal based on the current signal; a microcontroller configured to decompose the series arc and parallel arc detection signals via discrete wavelet transforms to thereby obtain discrete wavelet coefficients, and to generate a trip signal when the discrete wavelet coefficients indicate that a threshold condition for trip signal generation is satisfied. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification