Patent ID: 7719258

Claim:
An apparatus for current measurement using Hall sensors without iron cores, used to estimate a flowing current in an electric conducting cable, comprising: the Hall sensors, each of the Hall sensors is used for attaching to or locating near the electric conducting cable and to measure the flux density of the magnetic field directly generated by the flowing current, so as to generate an output voltage according to the flux density of the magnetic field; and a statistical operation circuit, coupled to the Hall sensors, to receive the output voltages of the Hall sensors, and to perform a statistical operation on the output voltages of the Hall sensors, so as to obtain a statistical voltage, the statistical operation circuit comprising: an operation amplifier, having first and second input ends and an output end, the second input end is coupled to ground; a plurality of first resistors, each of the first resistors is coupled between the first input end and the Hall sensors; and a second resistor, coupled between the first input end and the output end, wherein the apparatus for current measurement using Hall sensors without iron cores estimates the flowing current according to the statistical voltage.