© 2019 KEMET Corporation

EMI / EMC

Applications

© 2019 KEMET Corporation

Interference of Electromagnetic Environment

Many electric appliances make electromagnetic

noise and interfere with each other.

© 2019 KEMET Corporation3

Aggressor

(Noise Source)

Radiation

Conduction

Electrically long portion of the device can be a

noise radiating antenna (e.g. power cable).

Noise

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Z

Z

Inductor/Choke (MAGNETICS)Block with High Impedance

CapacitorGuide to GND with Low Impedance

Aggressor

(Noise Source)

Radiation

Z

ADD IMPEDANCE

Noise Reduction

© 2019 KEMET Corporation

Purpose of the Noise Countermeasure

1. To Meet Regulations

3. To Avoid Real Interference in Field

0.15 30.000.50 1.00 5.00 10.000

100

10

20

30

40

50

60

70

80

90

周波数

レベル

[MHz]

[dB(μV)]

2. To Avoid Self-Interference

SPEC LINENG

© 2019 KEMET Corporation6

Electronic devices are not

allowed to conduct noise into

the wall.

Electronic devices are not

allowed to radiate noise into

the air.

Conduction Emission Radiation Emission Signal Integrity

To improve radio quality such

as WiFi Connection.

Electromagnetic Interference (EMI) and Regulation

© 2019 KEMET Corporation

Transmitted Way of Electromagnetic Noise

Radiated EmissionConducted Emission

Conducted Emission

© 2019 KEMET Corporation

EMIElectro Magnetic

Interference

Standards and Regulations

EMCElectro Magnetic Compatibility

Law and Regulations(Electromagnetic Noise)

•International Standards:IEC, CISPR, ECE

•Regional Law and Regulations:FCC, EN, VCCI

EMSElectro Magnetic

Susceptibility

RE: Radiation Emission

CE: Conduction Emission

Radiation Immunity

Conduction Immunity

Intensity of Interference Durability of Interference

Electric Devices(EUT)

IT Devices

CommunicationDigital AV

AutomotiveMedical----------

In order to safely use the electronic equipment in the society,it is necessary to adapt the regulations to all of electromagnetic equipment & devices.

© 2019 KEMET Corporation

Standards and Regulations

International Standard

JPN US Canada EU

EMI

ISM EquipmentMicrowave Oven

CISPR Pub11 Electrical Appliance and Material Safety Act FCC Part18CSA C108.6

RIP-1EN55011

Ignition Equipment CISPR Pub12 JASO SAESOR/75-629CSA C108.4

EN55012

TV, Radio, VTR, Audio CISPR Pub13 Electrical Appliance and Material Safety ActFCC Part15 SubpartBFCC Part15 SubpartC

GRR Part2 EN55013

Household Appliances,Electric Tools, and Similar Equipment

CISPR Pub14-1Electrical Appliance and Material Safety Act,

Radio LawCSA C108.5 EN55014-1

Electrical Lighting,and Similar Equipment

CISPR Pub15 Electrical Appliance and Material Safety Act EN55015

I.T. Equipment CISPR Pub22Electrical Appliance and Material Safety Act

VCCIFCC Part15 SubpartB CSA C108.8 EN55022

Telephone, FacsimileCISPR Pub22

ITUElectrical Appliance and Material Safety Act

VCCIFCC Part15FCC Part68

CS-03 EN55022

Radio Communication Equipment ITU Electrical Appliance and Material Safety Act, VCCIFCC Part15FCC Part68

CS-03RSP-100

EMS

Common Rule IEC61000-4-1 EN61000-4-1

Electrostatic Discharge IEC61000-4-2 JIS C61000-4-2 EN61000-4-2

Radiated RF Electromagnetic Field IEC61000-4-3 JIS C61000-4-3 EN61000-4-3

Electrical Fast Transient, Burst IEC61000-4-4 JIS C61000-4-4 EN61000-4-4

Surge IEC61000-4-5 JIS C61000-4-5 EN61000-4-5

Immunity to Conducted Disturbances Induced by Radio-Frequency Fields

IEC61000-4-6 JIS C61000-4-6 EN61000-4-6

Power Frequency Magnetic Field IEC61000-4-8 JIS C61000-4-8 EN61000-4-8

Voltage Dips, Short Interruptions and Voltage Variations

IEC61000-4-11 JIS C61000-4-11 EN61000-4-11

© 2019 KEMET Corporation

Conduction Emission Measurement

RF Shielded Room or Electromagnetic Anechoic Chamber• Conduction noise is measured by an EUT measurement connected to the LISN via AC cable.

EUT: Equipment Under TestLISN: Line Impedance Stabilization Network

© 2019 KEMET Corporation

Radiation Emission Measurement

Open Area Test Site or Electromagnetic Anechoic Chamber• Radiated noise is measured by antenna height and angle on the maximum noise.

EUT: Equipment Under Test

© 2019 KEMET Corporation

Countermeasures for Noise

Grounding Shielding Filtering Layout

Power Supply

Main Board

Power Supply

Main Board

© 2019 KEMET Corporation

Noise Mode

"Differential (Normal) Mode Noise" "Common Mode Noise"

～PCB

(Noise Source)

Equipment

Ground Plane

Different Direction Noise Currents

PCB(Noise Source)

EquipmentSame (Common) Direction Noise Currents

Ground Plane

Stray capacitance

～

Differential mode currents flow in….“Line to Line"“Opposite directions“ Cancel each other out

Common mode currents flow in….“Line to Ground"“Same directions"

Small loop area Low emission level Large loop area High emission level

Conduction Emission Conduction EmissionRadiation Emission

© 2019 KEMET Corporation

~10GHz and more

SCR Series

SSRL Series

SSR Series

Large SCR Series

GL Series

ESD Series

NF Series

150kHz~30MHz 30MHz~1GHz

Smartphone

(Scale reference)

Conduction Emission Radiation Emission Signal Integrity

Magnetics Solutions for EMI

© 2019 KEMET Corporation15

SCR

Series

SSRL

Series

SSR

Series

Large SCR

Series

Conduction Emission Radiation Emission

150kHz~30MHz 30MHz~1GHz

Common / Differential Mode Chokes

© 2019 KEMET Corporation16

ESD Series

EMI Cores

Conduction Emission Radiation Emission

150kHz~30MHz 30MHz~1GHz

© 2019 KEMET Corporation17

~10GHz and more30MHz~1GHz

Smartphone

(Scale Reference)

Radiation Emission Signal Integrity

Flex Suppressor

© 2019 KEMET Corporation

Thank You!