To further improve mutual inductance and stability of conventional air-core coil

a new PCB air-core coil current transducer was proposed

to achieve high fidelity measurement.The new PCB air-core coil current transducer with completely new physical structure can efficiently repel outside electromagnetic interference by its special anti-interference ability

and can significantly improve transducer’s mutual inductance by simple combination of PCBs.The basic inductive principle and anti-electromagnetic interference mechanism of the new transducer were analyzed;the PCB structure designs for different current levels and the location of primary coil were presented.A prototype of one design was made

and its linearity and anti-interference ability were tested.The experiment indicates that the accuracy of the PCB air-core coil current transducer can reach 0.2 class under the rated current of 100A with enhanced anti-electromagnetic interference ability.