"Investigation_and_Reduction_of_EMI_Noise_Due_to_the_Reverse_Recovery_Currents_of_50_60_Hz_Diode_Rectifiers.pdf"
Abstract—Alternating current (ac)/ Direct current (dc) power
converters with dc-bus filters can achieve high power density, however,
it was found in this article that the reverse recovery currents
of the 50/60 Hz diode bridge can lead to significant electromagnetic
interference (EMI) noise violating EMI standards above 150 kHz.
This article analyzed and quantified the mechanism of the EMI
generation due to the reverse recovery currents of the 50/60 Hz
diodes. It was found that although the reverse recovery of the
50/60 Hz diode bridge repeats at a frequency of 50/60 Hz, the EMI
can be very high above 150 kHz due to the operating principle of
electromagnetic compatibility spectrum analyzers. Two techniques
were proposed to reduce the EMI due to the reverse recovery of the
diode bridge. The analyses were validated by either simulations or
experiments.
?
Note: The 150kHz upper limit is extremely optimistic. I've had 1968 1N4004 diodes produce commutation EMI up to above 10MHz. Pretty intense too.
?
