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Design Kit Design Your EMC-Filter

Order Code 744998

Characteristics

  • This Design Kit contains 10 test boards and a selection of suitable components for the simple construction of various line filters.
  • It offers a fast and cost-effective solution to set up line filters for common and differential mode suppression.
  • This are PCBs for test and evaluation purposes. The boards should not be installed in the final application.

Evaluate the best filter for your application!

Products

Order Code Data­sheet Replacement Order Code Simu­lation Downloads Product seriesIR
(A)
L
(mH)
RDC max.
(Ω)
VR
(V (AC))
VT
(V (AC))
Samples
7446620027SPEC
8 files WE-LF Common Mode Power Line Choke 0.4 27 1.2 250 1500
744822120SPEC
10 files WE-CMB Common Mode Power Line Choke 0.5 20 0.54 250 1500
744822110SPEC
10 files WE-CMB Common Mode Power Line Choke 1 10 0.36 250 1500
7446621007SPEC
8 files WE-LF Common Mode Power Line Choke 1 6.8 0.3 250 1500
744822233SPEC
10 files WE-CMB Common Mode Power Line Choke 1.5 3.3 0.12 250 1500
744823220SPEC
10 files WE-CMB Common Mode Power Line Choke 1.5 20 0.27 250 1500
744822222SPEC
10 files WE-CMB Common Mode Power Line Choke 2 2.2 0.07 250 1500
744823210SPEC
10 files WE-CMB Common Mode Power Line Choke 2 10 0.125 250 1500
744824220SPEC
10 files WE-CMB Common Mode Power Line Choke 2 20 0.22 250 1500
7446622002SPEC
8 files WE-LF Common Mode Power Line Choke 2 2.2 0.1 250 1500
744823305SPEC
10 files WE-CMB Common Mode Power Line Choke 2.5 5 0.095 250 1500
744822301SPEC
10 files WE-CMB Common Mode Power Line Choke 3 1 0.035 250 1500
744824310SPEC
9 files WE-CMB Common Mode Power Line Choke 3 10 0.105 250 1500
744823422SPEC
10 files WE-CMB Common Mode Power Line Choke 4 2.2 0.03 250 1500
744824433SPEC
10 files WE-CMB Common Mode Power Line Choke 4 3.3 0.035 250 1500
74466240007SPEC
8 files WE-LF Common Mode Power Line Choke 4 0.7 0.027 250 1500
7448030509SPEC
9 files WE-CMBNC Common Mode Power Line Choke Nanocrystalline 5 9 0.032 300 2100
744823601SPEC
10 files WE-CMB Common Mode Power Line Choke 6 1 0.013 250 1500
744824622SPEC
10 files WE-CMB Common Mode Power Line Choke 6 2.2 0.02 250 1500
7448040707SPEC
9 files WE-CMBNC Common Mode Power Line Choke Nanocrystalline 7 7 0.022 300 2100
744824801SPEC
8 files WE-CMB Common Mode Power Line Choke 7.5 1 0.01 250 1500
7466113SPEC
5 files WP-SMSH REDCUBE SMT with external thread with Pin 50
7466114SPEC
5 files WP-SMSH REDCUBE SMT with external thread with Pin 50
890324022007SPEC
8 files WCAP-FTX2 Film Capacitors 275
890324023006SPEC
8 files WCAP-FTX2 Film Capacitors 275
890324023025SPEC
8 files WCAP-FTX2 Film Capacitors 275
702936000SPEC
3 files WA-SNSR Self-Retaining Spacer
691134710002iSPEC
691101710002
8853522110021SPEC
6 files WCAP-CSSA Interference Suppression 250
8853522110031SPEC
6 files WCAP-CSSA Interference Suppression 250
8853522130111SPEC
6 files WCAP-CSSA Interference Suppression 250
8853522130151SPEC
6 files WCAP-CSSA Interference Suppression 250
Samples
Order Code Data­sheet Replacement Order Code Simu­lation Downloads Product seriesIR
(A)
L
(mH)
RDC max.
(Ω)
VR
(V (AC))
VT
(V (AC))
Samples

Find filter solutions quickly and cost-effectively with the

Design Your EMC-Filter Design Kit

This Design Kit offers a fast and cost-effective means of building up the filter design with various components. It allows for the examination of the filter circuit's performance in relation to the desired filtering effect, facilitating the seamless integration of the chosen filter circuit into the application. This can reduce development time and the associated costs.

For even more filter design possibilities, also check out our evaluation boards for specific applications.

Structure and mode of operation

The Discharge Resistor (R) allows to discharge the X-Capacitor when there is no load connected.

The X-Capacitor (Cx) represents a low impedance for high frequency differential signals.

The Common Code Choke (CMC) provides properties for differential and common noise filtering. At higher frequencies this choke acts as a stronger impedance than the capacitor.

The Y-Capacitors (CY1, CY2) short high frequency, common mode signals to ground.

Low-pass filters for common and differential mode suppression

Common Mode Filter

At common mode noise the inductance of the Common Mode Choke (CMC) is very high. This inductance and the Y-Capacitors (CY1, CY2) build a low-pass for high frequency common mode noise. The Y-Capacitors create a conductor for high frequency noise to internal ground, so common mode noise can be diverted. Because of the high common mode impedance of the Common Mode Choke at high frequencies, the interference current will be attenuated.

Differential Mode Filter

At differential signal noise current flows in through line L and returns through line N. Basically, in this situation the X-Capacitor (Cx) and the Leakage Inductance (LLeak) of the Common Mode Choke build a low pass filter. The loop of this low pass filter is closed via the X-Capacitor. The high frequency interference is filtered. Meanwhile the supply current, which has typically a much lower frequency (50-60 Hz), will pass the filter.

Insertion Loss Examples

Example 1 measured with:
CMC: WE-CMB S / 744 822 110 /
L = 10 mH / IR = 1 A
Cx: 890 324 023 025 /
C = 0.15 µF / UR = 275 VAC
Cy: 885 352 213 015 1/
C = 2200 pF / UR = 250 VAC

Example 2 measured with:
CMC: WE-CMB L / 744 824 220 /
L = 20 mH / IR = 2 A
Cx: 890 324 023 025 /
C = 0.15 µF / UR = 275 VAC
Cy: 885 352 213 015 1/
C = 2200 pF / UR = 250 VAC

Example 3 measured with:
CMC: WE-LF / 744 662 200 2 /
L = 2.2 mH / IR = 2 A
Cx: 890 324 023 025 /
C = 0.15 µF / UR = 275 VAC
Cy: 885 352 213 015 1/
C = 2200 pF / UR = 250 VAC

Example 4 measured with:
CMC: WE-CMBNC M / 744 803 050 9 /
L = 9 mH / IR = 5 A
Cx: 890 324 023 025 /
C = 0.15 µF / UR = 275 VAC
Cy: 885 352 213 015 1/
C = 2200 pF / UR = 250 VAC

Videos

#askLorandt explains: Design your EMC Line Filter Step by Step

Videos

Würth Elektronik Webinar: How do I solve EMI problems on pcb level?

Videos

#askLorandt explains: Design your EMC-Filter

Videos

Würth Elektronik Webinar: EMC Filters – From component to design