EMC 2016: International Symposium on Electromagnetic Compatibility and EMC Europe

Transcription

1 EMC 2016: International Symposium on Electromagnetic Compatibility and EMC Europe September 09 th, 2016, Wroclaw Dr. Jean-Roger K. Kuvedu-Libla Delphi Electronics & Safety Bascharage, Luxembourg 1

2 Outline Simple Decoupling and Coupling Strategies of Electromagnetic Disturbances from/on Cable Harnesses when using Automotive Component Testing Methods I Motivations and Backgrounds II Contents III Conclusions IV Questions 2

3 Simple Decoupling and Coupling Strategies of Electromagnetic Disturbances from/on Cable Harnesses when using Automotive Component Testing Methods I Motivations and Backgrounds a) Why investigating Decoupling and Coupling Strategies of Electromagnetic Disturbances? b) Where are the benefits and challenges? c) Objectives and Requests? II Contents III a) Particularities of Electromagnetic Coupling / Decoupling b) Definitions of Coupling / Decoupling c) Theoretical Backgrounds of Coupling / Decoupling d) EMC Requirements Conclusions a) Expecting Benefits b) Expecting Drawbacks IV Questions 3

4 Simple Decoupling and Coupling Strategies of Electromagnetic Disturbances from/on Cable Harnesses when using Automotive Component Testing Methods I Motivations and Backgrounds 4

5 I Motivations and Backgrounds Why investigating Decoupling and Coupling of Electromagnetics? a) Several main motives Safety & Reliability Demands for Vehicles & Automotive Component Test Methods That means Repeatable Conditions for Vehicles & Automotive Component Test Methods b) Key Contribution Parts needed? Cable Harness Ground Plane & Chassis & Housing Particularities of Return Lines of Harnesses Sensor- & Signal Lines L nm in µh of Lines Inductive Load C nn in µf Wire to Ground Plane C nm in µf Wire to Wire Capacitive Load Resistive Load L nm in mh of Lines c) Example of Application Parameters? Figure 1-1: Examples of Coupling on the Harnesses 5

6 I Motivations and Backgrounds Why investigating Decoupling and Coupling of Electromagnetics? a) Several main motives Safety & Reliability Demands for Vehicles & Automotive Component Test Methods That means Repeatable Conditions for Vehicles & Automotive Component Test Methods b) Key Contribution Parts needed? Cable Harness Ground Plane & Chassis & Housing Particularities of Return Lines of Harnesses c) Example of Application Parameters? Ground Plane C12 C13 C23 C11 C22 C33 C11 C22.. Cnn Ground Plane a) 3-Wires Harnesses b) n-wires Harnesses C1n Figure 1-2: Examples of Coupling Model 6

7 I Motivations and Backgrounds Where are the benefits and challenges? Level[dBµV] 100 a) Understanding of Coupling / Decoupling Capacitances respectively Parameters Harness Ground Pane Geometry Dependences Frequency Dependences b) Big Challenges: Analytic Expression of the Harnesses & Ground Plane & Chassis Matrix Forms Coupling of Kind of Disturbances (Common / Differential Modes) 7 R G L C a) Sensor- and Signal Lines b) Power Lines k200k 400k 1M 2M 3M 5M 7M10M 20M30M 50M 108M Frequency[Hz] MES11DE01_PosPk61 MES11DE01_PosAv61 LIMB217110C_CEAv B217110RevC-Averagelimit LIMB217110C_CEPk B217110RevC-Peaklimit Level[dBµV/m] Repeatable? M 250M 300M 350M 400M 448.4M Frequency[Hz] MES11DE01_lvAv1 LIMB217110C_REAv B217110RevC-Averagelimit LIMB217110C_REPk B217110RevC-Peaklimit Figure 1-3: Examples of Coupling Model

8 I Motivations and Backgrounds - Challenging Decoupling / Coupling? Objectives and Requests (1) Complexities of the Source functions (Common Modes & Differential Modes) Complexities of Cables Harnesses (Sensor- & Signal Lines & Power Lines) - Challenging of Measurement Understanding? Practice Experience Data Theoretical Descriptions (Mathematical / Analytical)? Challenges for Frequencies f 100kHz (Broadband Ranges) - Consequences of Decoupling / Coupling? Repeatability Conditions (Component & Vehicle Level) Where is the optimal positions of the harness wires TEM-Mode Wave Propagation Assumption 8

9 Simple Decoupling and Coupling Strategies of Electromagnetic Disturbances from/on Cable Harnesses when using Automotive Component Testing Methods II Contents 9

10 II Contents Particularities of Electromagnetic Decoupling / Coupling Level[dBµV] 100 Level[dBµV/m] k200k 400k 1M 2M 3M 5M 7M10M 20M30M 50M 108M Frequency[Hz] MES11DE01_PosPk61 MES11DE01_PosAv61 LIMB217110C_CEAv B217110RevC-Averagelimit LIMB217110C_CEPk B217110RevC-Peaklimit M 150M 160M 170M 180M 190M 200M Frequency[Hz] MES11DE01_bvPk1 MES11DE01_bvAv1 MES11DE01_rPk7 MES11DE01_rAv7 LIMB217110C_REAv B217110RevC-Averagelimit LIMB217110C_REPk B217110RevC-Peaklimit Repeatable? Level [dbµv] Level[dBµV/m] k300k500k 1M 2M 3M4M 6M 10M 20M30M 50M 108M Frequency [Hz] MES 11JN02_Pk2 LIM CISPR25_Con_BB_5_Pk (Broadband Class 5) M 250M 300M 350M 400M 448.4M Frequency[Hz] a) Conducted b) Radiated Figure 2-1: Example of Decoupling / Coupling Sources showing the Measurements MES11DE01_lvAv1 LIMB217110C_REAv B217110RevC-Averagelimit LIMB217110C_REPk B217110RevC-Peaklimit

11 II Contents Particularities of Electromagnetic Decoupling / Coupling 12V Battery Supply DUT 12V Battery Supply Periphery Periphery LISN LISN h = 5cm DUT Supply Lines Harness (Signal / Sensors) Ground Plane Harness (Signal / Sensors) h = 5cm Ground Plane Measuring Receiver Measuring Antenna 11 a) Conducted b) Radiated Figure 2-2: Example of Emission Test Setups

12 II Contents Particularities of Electromagnetic Decoupling / Coupling a) Coupling / Coupling Parameters? Frequency dependences: - Electric ~ ε - Magnetic ~ μ - Electromagnetic ε, μ b) Reference Point / Plane? Ground Plane Return Lines c) Hereby Electromagnetic Parameters? Sensor- & Signal Lines L nm in µh of Lines Inductive Load C nn in µf Wire to Ground Plane C nm in µf Wire to Wire Capacitive Load Resistive Load L nm in mh of Lines Expressions: - Matrix C - Matrix L - Matrix of Wave Impedance Zw Figure 2-3: Example of Decoupling / Coupling Sources / Parameters 12

13 II Contents Definitions of Electromagnetic Decoupling / Coupling a) Decoupling / Coupling in the Harnesses? d d Decoupling / Coupling Harness to Ground Plane (Diagonal Elements) h' C12 C13 C23 Cnm Decoupling / Coupling Harness Wires to Harness Wires (Cross Diagonal Elements) C11 C22 C33 C11 C22.. Cnn h b) The Test Setup Ensures TEM-Wave Propagations Ground Plane Ground Plane That means: Matrix C and Matrix L are binding thru the wave propagation speed c (for free space c 0 ) Figure 2-4: Model to express the Decoupling / Coupling Harness 13

14 II Contents Theoretical Backgrounds of Electromagnetic Decoupling / Coupling? a) Analytical Decoupling / Coupling Description of the Harnesses? Using the canonic Basic for the Description of Matrices: - Matrix C - Matrix L - Matrix Wave Impedance Zw jωc nm = jωc 11 jωc 1m jωc n1 jωc nm n- Wire Systems b) The Test Setup Ensures TEM-Wave Propagations That means: Matrix C Elements are: C nm = 2πε ln d 2h C nm = 2πε ln d 2h 14 with n = m with n m jωc 11 jωc 12 jωc 13 jωc 3x3 = jωc 21 jωc 22 jωc 23 jωc 31 jωc 23 jωc Wire Systems

15 II Contents Theoretical Backgrounds of Electromagnetic Decoupling / Coupling? a) Analytical Decoupling / Coupling Description of the Harnesses? Using the canonic Basic for the Matrices: - Matrix C - Matrix L - Matrix Wave Impedance Zw b) The Test Setup Ensures TEM-Wave Propagations That means: Matrix L Elements are L nm = ln 2h 2π ε 0 c 2 0 d 1 2h L nm = 2π ε 0 c 2 ln 0 d 1 with n = m with n m jωl nm = jωl 11 jωl 1m jωl n1 jωl nm n- Wire Systems jωl 11 jωl 12 jωl 13 jωl 3x3 = jωl 21 jωl 22 jωl 23 jωl 31 jωl 23 jωl Wire Systems 15

16 II Contents Theoretical Backgrounds of Electromagnetic Decoupling / Coupling? a) Analytical Decoupling / Coupling Description of the Harnesses? Using the canonic Basic for the Matrices: - Matrix C - Matrix L - Matrix of Wave Impedance Zw b) The Test Setup Ensures TEM-Wave Propagations Z w,nm = Z w,11 Z w,1m Z w,n1 L w,nm n- Wire Systems That means: Elements of Matrix Zw Z w,nm = μ ε = R +jωl G +jωc For R 0 and G 0 and L nm C nn = μ r ε r c 2 0 μ r = μ r + jωμ r ; ε r = ε r + jωε r ; μ r = 0; ε r = 0 Z w, stat,nm = μ ε = L C Z w,11 Z w,12 Z w,13 Z w,3x3 = Z w,21 Z w,22 Z w,23 Z w,31 Z w,23 Z w,33 3- Wire Systems 16

17 II Contents Theoretical Backgrounds of Electromagnetic Decoupling / Coupling? b) Examples for Matrix L : Using the canonic Basic for the Matrices: - Matrix C - Matrix L - Matrix Wave Impedance Zw Example of Matrix C C 3x3 = in pf/m 3- Wire Systems That means: Matrix C Elements are for the distance h above the Ground Plane (h 25mm): Approximately C 3x Wire Systems in pf/m 17

18 II Contents Theoretical Backgrounds of Electromagnetic Decoupling / Coupling? b) Examples for Matrix L : Using the canonic Basic for the Matrices: - Matrix C - Matrix L - Matrix Wave Impedance Zw Example of Matrix L L 3x3 = in µh/m 3- Wire Systems That means: Matrix L Elements are for the distance h above the Ground Plane (h 25mm): Approximately L 3x Wire Systems in µh/m 18

19 II Contents Theoretical Backgrounds of Electromagnetic Decoupling / Coupling? c) Examples for Matrix Zw: Using the canonic Basic for the Matrices: - Matrix C - Matrix L - Matrix of Wave Impedance Zw Example of Matrix Zw Z 3x3 = Wire Systems in Ω That means: Matrix Zw Elements are for the distance h above the Ground Plane (h 25mm): Approximately Z 3x Wire Systems in Ω 19

20 II Contents a) Test Set Up Parameters? EMC Requirements? Harness: d d Variable h: 0.35mm 100mm (Matrix Diagonal) Variable h: 0.69mm 100mm (Matrix Cross Diagonal) Reference h for Impedance Matrix: h < 25mm; h=50mm; h>50mm μ ε h' C12 C13 C23 C11 C22 C33 μ ε Cnm C11 C22.. Cnn h Fixed Parameter d: 0.69mm (Wire Diameter for Diagonal) Fixed Parameter d : 0.69mm (Wire Diameter for Cross Diagonal) Ground Plane Ground Plane Figure 2-5: Model showing Geometries and Material Constants Nature Constant: ε 0 = in As/Vm; ε r = 1; μ r = 1; c 0 = in m/s 20

21 Inductance Diagonal Lnn in 10 1 μh Impedance Diagonal Znn in Ω Capacitance Diagonal Cnn in 10 2 pf II Contents EMC Requirements? Interesting Interval for repeatability a) Distance Wire to Ground Plane h in m b) Distance Wire to Ground Plane h in m c) Distance Wire to Ground Plane h in m a) Diagonal Impedance Z w,nn b) Diagonal Capacitance C nn Figure 2-3: Example of Decoupling / Coupling Factor 21 c) Diagonal Inductance L nn

22 Inductance Cross Diagonal Lnn in μh Impedance Cross Diagonal Znn in Ω Capacitance Cross Diagonal Cnn in 10 2 pf II Contents EMC Requirements? a) Distance Wire to Wire h in mm b) Distance Wire to Wire h in mm c) Distance Wire to Wire h in mm a) Cross Diagonal Impedance Z w,nn b) Cross Diagonal Capacitance C nn c) Cross Diagonal Inductance L nn Figure 2-4: Example of Decoupling / Coupling Factor 22

23 Simple Decoupling and Coupling Strategies of Electromagnetic Disturbances from/on Cable Harnesses when using Automotive Component Testing Methods III Conclusions 23

24 24 III Conclusions Wrap Up 1 What are the topics? Decoupling and Coupling Strategies of Electromagnetic Disturbances from/on Cable Harnesses 2 What are the Expecting Benefits? Not only Safety & Reliability in Designs & Test Methods Better understanding of Designs, Test Methods and Model of Decoupling / Coupling Mechanism 3 Current Benefits: h 25mm between harness wires to Ground Plane / Return Lines give the reference point for Decoupling/Coupling h > 25mm for better Measurement Repeatable 4 What are the Challenges: Better Achievement of Decoupling/Coupling when using Automotive Test Methods 5 Current Drawbacks: Analytical descriptions of Decoupling/ Coupling Matrix not always simple but simple when using canonic Basic

25 Simple Decoupling and Coupling Strategies of Electromagnetic Disturbances from/on Cable Harnesses when using Automotive Component Testing Methods IV Questions 25

26 IV Questions 26