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X2Y EMI Filter Devices for Appliances

CISPR 14-1: was amended in November of 2008

The amendment 2008-11 now specifies that to comply with the RE (radiated emissions)
requirements products will have to meet the levels over the frequency range from 30
MHz to 1.0 GHz. Companies have until 2011 for all products to meet the new levels for
all IEC countries.

A summary of the changes follows:

The CISPR 14-1 amendment now specifies Radiated Emissions (RE) levels from

30 MHz to 1GHz. This amendment was issued in Nov of 2008 and requires that
new products comply by 2011 for all IEC countries.

The changes apply to the limits and the methods of measurement of radio

disturbance characteristics of electrical motor-operated and thermal appliances
for household and similar purposes, electric tools and electric apparatus.

The scope of the specification has also changed and now applies to the

conduction  and  the  radiation  of  radio-frequency  disturbances  from  appliances
whose  main  functions  are  performed  by  motors  and  switching  or  regulating
devices,  unless  the  RF  energy  is  intentionally  generated  or  intended  for
illumination.  Now  included  are  the  following  non  inclusive  list  of  typical
equipments:  household  electrical  appliances,  electric  tools,  regulating  controls
using  semiconductor  devices,  motor-driven  electro-medical  apparatus,  electric
toys, automatic dispensing machines as well as cinema or slide projectors.

Companies working to meet product compliance by the 2011 deadline can use X2Y EMI
filter devices to help electronic equipment can meet the new CISPR 14-1 specifications
and lower filter costs.

The picture on the next page shows a vacuum cleaner motor prototyped with an X2Y
filter device supplied by Maida Development Company. The X2Y filter is located on the
outside of the motor housing for prototype testing, and would be located within the
motor housing for optimum performance, yet the filter performance is still very good.

The data was generated using a current probe on the power leads with the DUT placed
in a shielded enclosure as depicted below. X2Y utilizes this approach as a prototype
test method to compare the performance of various types of EMI filters because many
customers use this test method prior to sending DUTs for final testing by labs that are
compliant for testing to CISCPR 14:1

Spectrum
Analyzer

Motor

DUT

X2Y Filter

AC Power

Current

Probe

Shielded Enclosure

Motor

Ungrounded

Test Set Up

0.1

100

Frequency (MHz)

M2 Probe after Maida X2Y1000pf MOV filter

No Filter

M1 Probe after X2Y MA71472M 4700pf filter

Ambient

AC Filter

Cap

AC/ DC Filter

MOV

MOV AC Filter

Applied

Conducted Emissions

100

1000