Webinar on KEMET EMC Filters

1. KEMET EMC Filters
Webinar Oct 27th, 2017
Dr. Claes Nender

2. KIT Events
• KIT – Granna, Sweden November 15, 2017
• KIT – Paderborn, Germany November 21, 2017
• KIT – Nuremberg, Germany November 23, 2017
ec.kemet.com/tech-seminars
ANNOUNCEMENT
KEMET KIT EVENTS – November 2017

3. EMEA Webinars 2017
• Advances in Ceramic Capacitors November 6, 2017
• Ceramic ESD Capacitors November 17, 2017
• New ALS70/80 Series & Press-Fit December 1, 2017
• Ceramic Safety Capacitors, Avoiding the Confusion December 4, 2017
• Class 1 MLCC Technology December 18, 2017
go.kemet.com/emeawebex
ANNOUNCEMENT
KEMET EMEA Webinars – November 2017

4. ANNOUNCEMENT
http://www.kemet.com/Hi-Temp-Ceramic
• Down-hole oil exploration
• Automotive and hybrid electric vehicles
(HEV)
• Defense and aerospace
IDEAL FOR USE IN:

5. Filters ?
low-pass
high-pass band-pass
band-reject notch
resonant
harmonic
CAM SAW
butterworth
Bessel
Tschebychew
active
passiveadaptive
digital
analogue
common mode
sine feed-through
DC
AC
PI
FIR
power
tuned
EMI

6. KEMET EMC filters
All KEMET filters are EMI filters
(EMI = Electro Magnetic Interference)
(EMC = Electro Magnetic Compatibility)
(RFI = Radio Frequency Interference)
Used to reduce disturbances from
• line (conducted)
• radiation
to equipment (immunity) or vice versa (emission).
Mandatory tests in many geographic regions
(EU, US, CAN …)

7. Why EMC Filtering ?
MAINS
AUDIO
MICROWAVE
RADAR
LIGHT
FREQUENCY
30MHz
Lw Mw Sw
Cordless phones
CB
CONDUCTED EN50082-2RADIATEDEN50082-1/2
VHF
Aircraft & Police
T.V.
Mobile Phones
RADIATED
10MHz1MHz150kHz 1GHz
1
2
Conducted EMI
via cables, PCB traces ( 1 & 2 )
Radiated EMI
( 3 & 4 )
3 4

8. Why EMC Filtering ?
EU directive 2014/30/EU set the requirements
for electric or electronic equipment that are
placed on the market.
CE marking indicate conformance of the
product.

9. EMC tests
Semi Anechoic Chamber (SAC) , for 3m measuring range.

10. EMC tests
Open Area Test Site (OATS) for 10m measuring range

11. EMC tests
Typical EMC measurement (some values over the limit)
Max peak value
Max average value

12. EMC : How to fix ?
• Shielding
• X-, Y- capacitors
• Snap-on inductive cores
• EMC filters

13. EMC Filters
• EMC Filters normally designed to reduce
generated EMI energy in the range of 150kHz
to 30MHz.
• Manufacturer and supply chain responsible for
EMC compliance of final product.
• Testing at 3rd party lab or in house for CE
marking.
R
4
• Filters can have Agency approvals according
to ENEC or UL according to various
standards (IEC, EN, UL etc.)

14. EMC tests
Typical EMC measurement after filtering
Max peak value
Max average value

15. Main data for a preliminary design in check
• Power line: Single/3 Phase
(with/without neutral)
• Rated Voltage, Rated Current @
ambient temperature
• Leakage current limitations
(medical application etc )

16. Main data for a preliminary design in check
• Case size
• Connectors (terminal block, bus bar)
• Attenuation level at different frequencies
• ENEC or UL approval required Yes/No

17. Current
 Current ratings of EMC filters are determined by the individual filter
components.
 Current flow leads to a temperature rise in passive components.
 The ambient temperature of the environment where the filter is to be
used has a direct impact on the rated current
 The nominal currents stated for our filters refer to an ambient
temperature of Tn = 40°C or Tn = 50°C
 The maximum operating current at any other ambient temperature T
can be calculated by means of the following formula:
 𝐼𝐼 = 𝐼𝐼𝐼𝐼 ∗ (𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇 − 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇)/(𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇 − 𝑇𝑇𝑇𝑇)
 Where
 In rated current at Tn
 Tact actual ambient temperature
 Tn temperature at which the rated current is defined
 Tmax rated maximum temperature of the filter

18. Current - Derating
Example:
 A filter with In = 7A at Tn = 50C and a rated maximum temperature of
Tmax = 100C is to be used at an ambient temperature of Tact = 65C,
 I= 7 �
100−65
100−50
= 5.9 A
 The rated current of this filter must be reduced to In (65C) = 5.9A
Overload
The actual current may also exceed the nominal current for certain
period of time. The exact specification are given in the datasheets for
each product.
Generally filter can be overloaded as below:
4 ∙ In switch on
1.5 ∙ In 1min/hour

19. Voltage
 Most common nominal voltages are defined in IEC 60038
 A European power grid, for example, has defined the nominal
voltage of 230V +/- 10%. The maximum voltage at the terminals can
therefore be 230V + 10% = 253V
 The rated voltage of the filter defines the maximum continuous
operating voltage , i.e., the maximum voltage at which the filter can
be used continuously
 Short over-voltages are permitted in accordance with IEC60939
 Voltage rating is usually given for a supply frequency of 50/60Hz
 If the filter is operated at higher frequencies (e.g., 400Hz), it may be
necessary to derate the voltage

20. Insertion loss
Filter attenuation (insertion loss):
 Filters are generally described by their attenuation, also called
insertion loss (dB).
 Load and source impedance is most commonly 50Ω
 The attenuation is calculated from the equation:
 A dB = 20 � log 𝑉𝑉𝑉/𝑉𝑉𝑉
 The measurement method is described in CISPR 17.
 Both asymmetrical (common-mode) and symmetrical (differential
mode) attenuations need to be measured
 The results are usually displayed in an attenuation diagram
 The test results from a 50Ω system do not tell the end user how well
the filter is going to perform under other load conditions with other
source and load impedances

21. Insertion loss
0
10
20
30
40
50
60
70
80
90
100
10,000 100,000 1,000,000 10,000,000 100,000,000
Attenuation(dB)
Frequency (Hz)
Insertion loss data
Symmetric Asymmetric

22. Leakage current
Filter leakage current (ILK)
 The filter leakage current (ILK) is the current flowing through the
protective earth conductor or the metal casing of the filter
(usually through the Y - capacitors connected to the earth)
 The specified filter leakage current refers exclusively to the filter and
differs from the leakage current of the equipment or system
 Filter leakage current is specified as a calculated value according to
IEC 60939-1 Annex A and it is purely theoretical and does not
represent a maximum value which takes into account all the
possibilities of the network conditions and the maximum component
tolerances

23. Mechanical Specifications
Mechanical tolerances:
 The mechanical tolerances in our drawings are given in accordance
with EN 22768-2 (ISO2768-2)
 Instead of defining each individual tolerance, it is sufficient to give a
reference to the tolerance classes of the above-mentioned standard.
Filter terminals, torque specifications and cable cross-sections:
 KEMET EMC filters can be equipped with a number of different
standard connectors.
 In the datasheets there are recommendations and definitions for the
right cable cross-sections and torque specifications to guarantee
proper function and to avoid mechanical failures of the terminals

24. KEMET EMC Solutions
Compentency in components and testing
EMC Testing
EMC Filters
EMI Caps
Customized

25. KEMET EMC Capabilities
25 Years Experience
KEMET Sweden
• R&D
• Pre-Production Runs
• Accreditation for Common EN standards
• Semi-anechoic test chamber: 10 x 5 x 5m
• Open Area Test Site: 18 x 10 x 5m.
• Capabilities for Emission and Immunity
measurements
Skopje Macedonia
• Production

26. Typical
Applications

27. EMC Filters
Focus Market segments
Renewable
Energy
Process
Automation
Motor and Power
Drives
Medical
Equipment
TransportationMachine
Tools

28. EMC Filters
Focus Products – 3 Phase& DC filters
FLLE2 – PV, 1,200 VDC, 250 –
2,500 A
Chassis Mount DC EMI Filters
for Photovoltaic Inverters and
Automotive Battery Chargers
FLLD3 – MH, 3-phase Filter
– up to 180 Amp
FLLD3 – PV, HIGH Current 3-
phase Filter – up to 2500 Amp
FLLDH – DU Power Feed Through
Filter
FLLD4 – TH, 3-phase +
neutral Filter – up to 200
Amp

29. Machine Tools
Three Phase Filters
• High Speed Compressors
• Drives
• Punching machines
• Wood working machines
• Welding machines
• UPS
• Laser cutting machines
Three
Phase
Series Function
Rated
Voltage
Irms
Agency
Approvals
Max
Operating
Temp
Schurter Schaffner TDK
FLLD3 MH EMI 530Vac 7 -180 A UL/ENEC 100°C FMBC FN3258H B84143A*R105
FLLD3 PV EMI 520Vac 250-2500 A NO 100°C FMMCC FN3359 B84143-B
FLLD4 TH EMI 530Vac 8-200 A UL/ENEC 100°C FMBD FN3280 B84144A*R140

30. EMC Filters
Focus Products – 3 Phase & DC filters
FLLE2 – PV, 1,200 VDC, 25 –
1,600 A
Chassis Mount DC EMI Filters
FLLD3 – PV, High
Current 3-phase 520 Vac
Filter – up to 2500 Amp
On board filter connected
between charger station
plug and battery
Filter connected
between charger
station and mains

31. DC Filter for Automotive Application
KEMET supplies high voltage DC - filters
for demanding Automotive applications
EMC noise generated in high power frequency
converters may have a degrading impact on
high voltage battery stacks. In order to protect
the batteries and reduce the EMC problems,
KEMET’s DC - filters are providing an
optimized solution for performance and cost.
Specifications
Rated Voltage 500 - 1000 Vdc
Rated Current 60 - 600 Adc
High insertion loss for symmetric and
asymmetric modes from 10kHz to 300MHz
Temperature range -40°C — +110°C
Dimensional example 146 x 88 x 64 mm
KEMET has the ability to esign filters
according to customer specifications:
• Case size
• Connections
• Attenuation
AC
protection
DC Filter

32. Inverter
PowerGrid
FLLE2 … PV series
DC
Filter
FLLD3 … PV series
3-Phase AC
EMC Filter
PV Systems
DC and Three Phase Filters
FLLD3 … PV series
Running designers:
• EEI (1600A)

33. Wind Turbines
Three Phase Filters
High power 3-phase
Filter: FLLD3 … PV
Rectifier
AC-DC
DC-
LINK
Inverter
DC-AC
3 Phase
Line Filter
and
Transformer
Control Board and
Communication
Utility
Grade AC
Power
Generator
Turbine Control Unit
(TCU)

34. Magnetic Resonance (MR) Machine
Computer Tomography (CT)
X-Ray Machine
Medical Equipment
Feed-Through Filters
FLLDU/DH

35. Customized filter
950Vac Low- and High pass filter for modem communication on power line
Adapted for 19” rack system

36. Thank You!