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CE Analyst Overview | Conducted Emissions Analysis Overview

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CE Analyst™ - Conducted Emissions Analysis software calculates interference induced on cables by active circuitry in electronic systems. – PowerPoint PPT presentation

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Title: CE Analyst Overview | Conducted Emissions Analysis Overview


1
Conducted emissions analysis overview
EMI ANALYST Software Suite
  • Intuitive ? Accurate ? Effective

2
EMI Analyst is a 4-in-1 EMI Analysis Tool
  • EMI Analyst calculates electromagnetic
    interference for cable-connected circuits
  • Conducted Emissions CE Analyst
  • Audio and radio frequency noise emitted on cables
  • Conducted Susceptibility CS Analyst
  • Interference induced by noise on cabling
  • Radiated Emissions RE Analyst
  • Electric and magnetic fields emitted by cables
  • Radiated Susceptibility RS Analyst
  • Noise induced by electromagnetic fields on cables

3
What does CE Analyst do?
  • Calculates RF current and voltage induced on
    cables and circuitry by active circuits

4
EMI Analyst Covers All Frequency Domain
Conducted Emissions (CE) Specifications
  • All industries
  • Consumer and Industrial
  • Aviation
  • Automotive
  • Military and Space
  • All frequency ranges
  • Audio Frequency, 10 Hz 150 kHz and up
  • Radio Frequency, 10 kHz 152 MHz and up

5
Typical Audio Frequency CE Setup
  • Military and Space
  • CE101, MIL-STD-461G/F/E/D
  • CE01, MIL-STD-461C
  • Automotive
  • CISPR 25
  • Aviation
  • DO-160G/F/E/D/C, Section 21
  • Consumer and Industrial
  • IEC EN 55011 and EN 55022

6
Typical Radio Frequency CE Setup
  • Military and Space
  • CE102, MIL-STD-461G/F/E/D
  • CE03, MIL-STD-461C/B/A
  • Automotive
  • CISPR 25
  • Aviation
  • DO-160G/F/E/D/C, Section 21
  • Consumer and Industrial
  • IEC EN 55011, EN 55022

7
What Information is Needed?
  • Before you start the analysis, collect
  • Frequency range of the analysis
  • CE test limit
  • Active circuit waveforms
  • EMI filter schematic
  • Cabling configuration
  • End circuit schematic

8
Conducted Emissions Example
  • Switch Mode Power Supply (SMPS)
  • For this example, MIL-STD-461F method CE102

Frequency Range 10 kHz 10 MHz CE102 Limit 94
60 dB?V EMI Filter Low pass, T-section Cabling
configuration Shielded wire pair over ground
plane, conductive fabric tape shield End
Circuit LISN Power Supply Pass/Fail
Criteria Conducted emissions must be less than
CE limit
Block Diagram
Circuit Schematic
9
Frequency Range
  • Start Stop frequencies
  • Log or Linear scale
  • Resolution
  • Pts / Decade for Log Scale
  • Hz for Linear Scale
  • Example MIL-STD-461F, CE102
  • Range 10 kHz 10 MHz
  • Scale Log
  • Resolution 90 pts / decade
  • 10 kHz 150 kHz in 1 kHz steps
  • 150 kHz 10 MHz in 10 kHz steps

10
CE102 SMPS Noise Source
  • Switching power supply produces
  • Differential mode current
  • Common mode voltage
  • EMI Analyst? needs only circuit waveforms from
  • Datasheets
  • Circuit analysis output
  • Oscilloscope measurements

11
SMPS Interference Noise Source
Input DM Current
Input CM Current
FET Switching Voltage
12
Cabling Configuration
  • 8 built-in templates
  • 4 shielded, 4 unshielded
  • Enter
  • Physical dimensions
  • Conductor and dielectric materials
  • Computes
  • Characteristic impedance
  • R, L, C values

13
Cabling Configuration
  • Shielded Wire Pair Over Ground Plane for this
    example
  • 18 AWG wires
  • Twisted, shielded pair
  • 5 cm above aluminum ground plane per MIL-STD-461F
  • Fabric tape shield. Properties are defined on
    Transfer Impedance form

14
Conductive Fabric Tape Shield
  • Laird 86203 Nickel/Copper Black Fabric Tape

15
Conductive Fabric Tape Properties
  • Conductive Layer
  • Nickel over Copper-plated polyester fabric
  • Adhesive Layer
  • Acrylic, conductive

16
Fabric Resistivity and Adhesive Resistivity
  • Thickness of metalized fabric is not specified
  • Fabric Adhesive 0.13 mm
  • Assume fabric is 0.065 mm (half)
  • Surface Resistivity
  • ?? ?? ?? ?? O ????????????
  • ?? ???????????? ???? ?? 0.065 ???? ?? 0.06 O
    ???????????? 3.9 ?? 10 -6 O-??
  • ?? ???? 1.68 ?? 10 -8 O-??
  • ?? ?? ???????????? ?? ???????????? ?? ????
    232.14
  • Adhesive Resistivity
  • ?? ????h?????????? 25.8 ?O ????.-?? , assuming
    metallized fabric is much more conductive than
    adhesive

17
End Circuits
  • Schematic capture
  • Ladder network
  • Passive components (R, L, C, and magnetically
    coupled)
  • Left-End of cable
  • EMI filter for PS circuit
  • Right-End of cable
  • LISN circuit

18
Left-End Circuit EMI Filter
Input Power Filter Schematic
EMI Analyst Filter Schematic
19
Right-End Circuit LISN and DC Power Supply
LISN schematic EMI Analyst LISN schematic and
power supply impedance
20
Analysis Results
View current and voltage at all points in the
circuit and anywhere along the length of the
cable.
21
Analysis Results Animated
  • Cable Input Impedance, 10 kHz to 10 MHz
  • Wire1-to-Shield (blue)
  • Shield-to-Ground (orange)
  • Wire1-to-Wire2 (green)
  • Animate any cable current, voltage, or impedance
    over frequency or cable length

Click graph to play
22
Analysis Results 3D
  • View cable current, voltage, or impedance versus
    frequency and position on cable
  • Rotate Click drag
  • Zoom Ctrl drag
  • Move Shift drag
  • Shown Common Mode Current

23
Summary
  • The preceding example computes conducted
    emissions produced by a switching power supply
    and compares results to the MIL-STD-461F, CE102
    limit.
  • Conducted emissions are one of four applications
    in the EMI Analyst? Suite
  • CE Analyst
  • RE Analyst
  • CS Analyst
  • RS Analyst
  • Recommended links
  • https//www.emisoftware.com/blogs/emi-analysis-too
    l-emi-analyst-overview/
  • https//www.emisoftware.com/blogs/what-else-can-em
    i-analyst-do/
  • https//www.emisoftware.com/blogs/right-blend-elec
    tromagnetic-interference-analysis/
  • https//www.emisoftware.com/blogs/6-qualities-to-l
    ook-for-in-emi-software/
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