Reconstruct the PWM Signal of Switching Power Supplies from the Near Field Radiation

Abstract:

A non-contact testing method is proposed for encapsulation treated or insulation coated switching power supplies, which is implemented by reconstructing the pulse width modulation (PWM) signal of switching converters from the near field radiation of magnetic components. The radiation pattern of a buck converter is investigated, and the magnetic field sensing probe and PWM signal reconstruction circuit are also illustrated. The reconstruction testing is carried out on a buck converter; the duty cycle error of the reconstructed PWM signal is less than 0.2%, which validates the proposed method.

• Periodical: Advanced Materials Research (Volumes 718-720)
• Pages: 1792-1796
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.718-720.1792
• Online since: July 2013
• Authors: Zhong Qun Li, Kai Xie, Ying Hao Ye, Rong Bin Guo, Xu Fei Wang
• Keywords: Fault Diagnosis, Near Field Measurement, PWM, Switching Converters

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