Abstract:
Background With the rapid development of high-mobility, high-power and intelligent ground vehicles, vehicle-mounted power conversion systems featuring high voltage and large power generate strong electromagnetic noise via high-frequency switching of IGBT devices. The compact layout in vehicles intensifies electromagnetic coupling and wideband radiation, posing potential health risks to occupants. Current studies mostly focus on equipment-level electromagnetic compatibility and system reliability, while systematic research on quantitative assessment of human radiation hazards is insufficient.
Purpose This study aims to quantitatively analyze the spatial distribution of PWM radiation and human bioelectromagnetic response, evaluate the electromagnetic exposure safety of occupants, and provide theoretical and technical support for electromagnetic protection design of vehicle-mounted power systems.
Methods A field-circuit co-simulation model of “interference source-coupling channel-human electromagnetic effect” was established for a typical ground vehicle power conversion system. Human tissue electrical parameters were modeled based on the Cole-Cole model, and specific absorption rate (SAR) was adopted to quantify the thermal effect. Simulations and experiments were carried out in accordance with CISPR 25, and exposure levels were compared with GB 8702-2014, ICNIRP and IEEE standards.
Results The electromagnetic radiation energy is mainly concentrated below 100 MHz with a peak at 48 MHz. The whole-body and local SAR values of all occupants are far below international safety limits, and the SAR of rear occupants is significantly lower than that of front occupants. The LC filter circuit can effectively suppress the radiation field below 300 MHz.
Conclusions The electromagnetic radiation of the vehicle-mounted power conversion system meets safety standards, and the LC filter can remarkably reduce the electromagnetic exposure level. This work provides a reliable theoretical basis and engineering reference for electromagnetic safety protection of vehicle-mounted power conversion systems.
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