On-Board Type (DC) EMI Suppression Filters (EMIFILr)

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Noise EMI Suppression Effect Effect of VFR/VFS Series
C31E.pdf
08.9.1
Continued from the preceding page.
2. Absorption of wide-pulse noise (50ns/div, 200V/div)
Type of Filter
EMI Suppression Effect
Description
200ns
without Filters
1300V
Noise wave applied
Two terminal capacitor
100
90
80
In capacitors the voltage of the residual
surge (1300V) is higher than that of the
above example. The wave height is
almost the same as the original.
20
10
0%
Three terminal capacitor
(with ferrite bead)
100
90
80
20
10
0%
Conventional EMI filters do not work for
wide-pulse noise because capacitors
are saturated. In this example, the
residual 1200V surge can cause the
system to breakdown.
VFS9V
100
90
80
Bypassing the high voltage to the
ground, voltage can be suppressed.
20
10
0%
5
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