How should power frequency magnetic field immunity be designed for power DTU?

Designing a DTU for power frequency magnetic field immunity requires shielding and compensation techniques. A shield with a thickness of 0.5mm or more should be made using a high-permeability material (such as permalloy). In PCB layout, the area of sensitive loops should be minimized, and differential signal transmission should be used. For magnetic components such as transformers, symmetrical winding methods should be used to cancel magnetic field interference. The shield shape should be optimized by simulating and analyzing the magnetic field distribution. In actual testing, a 100A/m power frequency magnetic field test should be conducted according to IEC61000-4-8 standard; the system should exhibit no abnormalities. Power frequency magnetic field immunity design allows the system to operate stably near power transformers.