This paper presents the electromagnetic interface (EMI) impact on the current transformer with amorphous HB1-M core, printed circuit board (PCB) power transformer and the filter of inductor for Internet of Things (IoTs) device. According to the antenna principle, the radiation emission power responses of PCB transformer and current transformer are estimated and found to be negligible due to the EMI experimental report. Based on this reason, consideration of the amorphous core in design manufacturing and EMI filter development is indispensable. Thus, the current transformer of amorphous HB1-M core is annealed at 350°C and soaked for 1.5 h. The simulation results of electromagnetic field show an EMI impact on filter performance. EMI frequency between 50 to 400 MHz for filter is found to be suitable for PCB. Experimental results have confirmed that the application of PCB transformer with HB1-M would be performed as well in high permeability and sensitivity.
Key words: Internet of things (IoTs), electromagnetic interface (EMI), soft magnetic sensor.
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