Research on Electromagnetic Interference of Integrated Circuit for Intelligent Electronic Lock

In view of the electromagnetic interference (EMI) of Tesla coil on intelligent electronic lock, the structure and internal circuit of Tesla jammer were analyzed firstly. Then, a near-field probe was made by using coaxial cable to simulate the electromagnetic field coupling of the closed loop and the wire as receiving antenna in the actual circuit. The results show that the electromagnetic field distribution of Tesla jammer is related to the spatial position, interference frequency and interference direction. Then, the electromagnetic immunity test platform of integrated circuit (IC) was built to test the interference of master IC for intelligent electronic lock under different space angles, interference frequencies and interference amplitudes. Regardless of the working state of the system, the coupling efficiency of IC in EMI environment is consistent in frequency selection, and the influence of angle change on the electromagnetic coupling voltage of IC pins presents a specific change rule. Finally, the electromagnetic coupling effect of IC pins under any interference intensity was extrapolated based on the variation law of pin coupling voltage and interference intensity.