Rectification Cases of Vehicle Radiation Exceeding Standard Caused by Unconventional Low-voltage Components

When a pure electric vehicle was subjected to narrowband emission testing in accordance with the requirements of GB 34660-2017, there were multiple peaks that exceeded the standard. Use a spectrometer and near-field magnetic field probe for near-field scanning, and scan the installation area of the newly added components of the modified vehicle. When the probe approaches the position of the armrest box, the spectrum analyzer can capture multiple frequency interference signals, which are highly consistent with the vehicle test data. Ultimately, the disturbance source is determined to be the fragrance controller located at the lower part of the armrest box storage box. Finally, a rectification measure was proposed to directly add resistance to the output pins of the control board antenna chip, and to suppress interference by limiting the antenna transmission power. The rectification measures are easy to implement and have sufficient margin, providing support for mass production implementation.