Common mode conducted RFI emission of an AC/DC converter with sinusoidal input current

This paper discusses the modeling and the measurement of common mode conducted electromagnetic interference (EMI) in a single-phase AC/DC power converter with sinusoidal line current. Many papers have already been published on different switching power supplies all aiming at low frequency harmonics emission or simple power converter control strategies. This paper, however, highlights common mode noise generation and emission in the radiofrequency range (10 kHz-30 MHz) i.e. RFI (radiofrequency interference) in a power converter which has a relatively complicated control strategy based on current mode PWM control. The power converter is composed of a diode rectifier and a conventional boost chopper. Software which simulates power converter behavior and computes common mode current noise harmonics has been developed. Noise signal measurements are carried out by means of a line impedance stabilization network. The simulation results are compared to monitored waveforms on an experimental set-up