Patent ID: 7492562
Filing Date: 2009-02-17
Classification: G01R

Abstract:
1. A temperature compensated current sensor for a circuit protection apparatus comprising: a circuit protection device adapted to be operatively coupled to a powered circuit having current flowing therein; a bus adapted to carry power therethrough; a sensing resistor electrically coupled to the bus, the sensing resistor comprising a first end and an opposing second end, the sensing resistor adapted to provide a signal indicative of current flow through the bus; temperature sensitive compensation circuit electrically coupled to the sensing resistor, the temperature sensitive compensation circuit comprising a first thermistor electrically coupled to the first end of the sensing resistor and a second thermistor electrically coupled to the second end of the sensing resistor, the temperature sensitive compensation circuit adapted to attenuate the signal indicative of current flow through the bus to a temperature compensated signal; and an arc fault determination circuit adapted to determine an arc fault based upon the temperature compensated signal.