ECE XXXXXXXXXXFall 2022 ECE 5234 EMI Noise Reduction and Filter Design Project #2 (Final Project) Due date: Dec 4th (Sunday) Important instructions: -  Please type in your project...

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ECE 5234 Fall 2022 ECE 5234 EMI Noise Reduction and Filter Design Project #2 (Final Project) Due date: Dec 4th (Sunday) Important instructions: -  Please type in your project reports (no handwritten reports).  All plots are required to be shown in semi-log scale with units, axis labels and legends clearly indicated.  Please provide enough steps while answering questions (only final answers with no explanations or steps would not count) 1. (total 60 points) This project requires the student to design an EMI filter for the dc-dc converter to comply with the requirement of MIL-STD-461E. The circuit and simulation parameters are listed below, Figure 1. DC-DC converter under study (left) circuit diagram, (right) time domain waveforms VDC = 100 V, Vo = 150 V, duty (D) for S1 = 0.5, fsw = 10 kHz, DS2/S3 = 0.2 Lboost = 1 mH, Cdc = 100 uF, RLOAD = 10 ohm, Cload = 100 pF, Simulation time step: Tstep = 10 ns The LISN between the DC source and the converter should be as per the MIL standard specification, shown below: ECE 5234 Fall 2022 Use the simulation file attached with this homework to generate the CM and DM voltages for the equivalent circuit models and filter design (Using MATLAB Simulink) Figure 2. MIL-STD-461E a) Please show the DM and CM equivalent circuit diagrams for the circuit in Fig. 1. (Hint: Trace the path for CM and DM currents to get the equivalent circuit models) b) Please plot the simulated DM and CM raw noise measured across LISN resistor in bode plot (semilog scale) (dBµV vs. frequency). c) Please design a single stage EMI filter (DM and CM inductors, DM and CM capacitors) by considering impedance mismatch at the input of the converter in Fig. 1. Set CM capacitance upper limit to be 100 nF and DM capacitance upper limit to be 10 uF. Provide a noise margin > 3 dB. Please show your step-by-step design procedure and provide the list of component value. (If Matlab or other math software is used, please provide the code). d) Please show the DM and CM equivalent circuits with your designed EMI filter for the circuit in Fig. 1. All components’ values need to be labeled. Plot the CM and DM noise level with your designed EMI filter and compare it with the standard (plot in dBµV vs. frequency). e) If the EMI filter CM inductor has equivalent parallel capacitance (EPC) of 50 pF and 100 pF, please discuss the filter performance and design change if necessary for the two cases. i.e., please quantify the required change in EMI filter performance. Figure 3. Circuit of CM inductor with EPC and CM capacitor with ESL 104 105 106 107 Frequency (Hz) 50 55 60 65 70 75 80 85 90 95 100 N o is e L ev el ( d B u V ) MIL-STD-461E ECE 5234 Fall 2022 2. (total 40 points) f) Set EPC of CM inductor to be 10 pF and ESL of CM capacitors (Y-capacitors) to be 10.5 nH (c). Please discuss the filter performance and design change if necessary. i.e., Please quantify the required change in EMI filter parameters. g) Design a PCB winding-based inductor to cancel the ESL of CM capacitor as shown below using ANSYS Q3D. Figure 4. Equivalent circuit for virtual inductor and physical representation in The dimensions of the virtual inductor are shown below. Figure 5. Dimensions of the two coils and module to be used What vertical distance between the two windings can cancel the ESL of 10.5 nH at 1 MHz? Please show the final simulated impedance matrix (AC-RL) as well. Plug the equivalent circuit with ESL cancellation in Fig. 4(left) in the EMI simulation model and show the revised EMI spectrum with this cancellation technique. Please provide merits and demerits of this technique if any. (Hint: radiated emission?) To power. 50H wi 1 ToEUT T 0.25 uF Ly To 50 © terminati or 50 9 input of measurement sa a Ny T = ow» LISN element values for MIL-STD-461E Signal output port
Dec 02, 2022
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