Patent ID: 7714567

Claim:
A sensor to detect an electrical current in plurality of electrical wires, the sensor comprising: a first magnetic field sensing coil providing a first sensed signal and having a first port and a center axis; a first amplifier having an input port coupled to the first port of the first magnetic field sensing coil and an output port; a second magnetic field sensing coil providing a second sensed signal and having a first port and defining a center axis; a second amplifier having an input port coupled to the first port of the second magnetic field sensing coil and an output port; an amplitude detector having a first input port coupled to the output port of the first amplifier, a second input port coupled to the output port of the second amplifier, and an output port; and a comparator having a first input port coupled to the output port of the amplitude detector, a second input port couple to a source of a reference value, and an output port to provide an indication of a presence of the electrical current; wherein the center axis of the first coil and the center axis of the second coil form a positive angle.