Aimed at the problem that the simulation of electromagnetic radiation interference of a switching power supply module is not combined with its actual working conditions,a method combined with near-field scanning was proposed.First,a simulation model of the switching power supply was built by software Cadence Allegro,and the software Cadence Sigrity was used to obtain the near-field radiation image and data by performing eletromagnetic radiation simulations of the switching power supply module.Then,a near-field scanning system of electromagnetic radiation was built to test the electromagnetic radiation interference of the switching power supply module,and its near-field electromagnetic radiation cloud map and electric field distribution data were obtained.Finally,by comparing the electromagnetic radiation distribution data obtained from near-field scanning and simulations,the simulation results were verified,and the MOSFET switch tube device and the surrounding circuit in the switching module were determined to be the source of electromagnetic radiation with the highest intensity.
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