Noise Suppression Effect of VFR/VFS Series

Type of Filter

Without Filters

Two-terminal capacitor

VFS9V

Three-terminal capacitor

(with ferrite bead)

EMI Suppression Effect

Description

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.

Conventional EMI filters do not work for

wide-pulse noise because the

capacitors are saturated. In this

example, the residual 1200V surge can

cause the system to break down.

Bypassing the high voltage to the

ground suppresses the voltage.

2. Absorption of wide-pulse noise (50ns/div, 200V/div)

Noise wave applied

100

90

80

20

10

0%

100

90

80

20

10

0%

100

90

80

20

10

0%

200ns

Continued from the preceding page.

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• This catalog has only typical specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering.