Method of Segmented Turns Arrangement of PCB Rogowski Coil With Anti-Interference Ability

The printed circuit board Rogowski coil (PCB RC) has been widely applied in the complex electromagnetic environment, such as power electronic devices, where it is placed outside but very close to current-carrying conductors; thus, this brings great challenges to the anti-interference ability of it. Generally, the anti-interference ability of PCB RC is greater with more turns; however, the number of turns is limited by two aspects: the one is the bandwidth of PCB RC, which is reduced as the turns increase, and the other is the minimum distance between vias, which is determined by process technology. This article proposed a method of segmented turns arrangement of PCB RC to acquire better anti-interference ability almost without lowering the bandwidth and get closer to the technical limit of distance between vias. The segmented turns are designed to be stair-stepping rather than rectangular used in traditional integral turns, which is equivalent to splitting a complete rectangular turn into several small rectangular turns so that the turns density is increased with the anti-interference ability improved. As an example of the method, a square PCB RC with proposed segmented turns is designed and compared with the PCB RC with traditional integral turns, and the results of calculation and experiment show that the anti-interference ability of PCB RC with proposed segmented turns is enhanced to be doubled and very great even near the corner of the PCB RC.