Graded resistance solid state current control circuit
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United States of America Patent
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Dec 24, 2013
Grant Date -
Sep 27, 2012
app pub date -
Jun 7, 2012
filing date -
Dec 18, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A circuit fault detector and interrupter which consists of parallel current conduction paths, including a path through a mechanical contactor and a path through a power electronics switch having active feedback control. A fault can be detected by a fault detection circuit within 50 μS of the occurrence of the fault, causing the mechanical contactor to be opened and the fault current to be commutated via a laminated, low-inductance bus through the power electronics switch. The power electronics switch is thereafter turned off as soon as possible, interrupting the fault current and absorbing the inductive energy in the circuit. The fault current can be interrupted within 200 microseconds of the occurrence of the fault, and the device reduces or eliminates arcing when the mechanical contactor is opened.
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