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CHAPTER 8: FILTER REALIZATION AND EXPERIMENTAL RESULTS during the filter design, the resonance point of that filter has to be at low frequencies not to encounter problems of resonance with the switching frequency harmonic clusters. With such a design constraint the final attenuation will be more than the one needed, thus resulting in such attenuation. In the common mode case, instead, the filter is attenuating just the needed amount: the new emissions are quite close under the limit also considering the visible peak at 10MHz, thus showing a proper design. Now, the same measurements will be carried out, once again, for a regular 240V, 50Hz supply, to show that the filter works properly, disregarding the input voltage or frequency. This is shown in figures from 8.14 to 8.17. I [dBµA] 80 60 40 20 0 −20 −40 0.1 1 10 Frequency [MHz] w/o filter With filter Limit Figure 8.14: Comparison of Measured output DM emissions: without and with output I [dBµA] 80 60 40 20 0 −20 EMI filter (240V-50Hz to 168V-50Hz) −40 0.1 1 10 Frequency [MHz] w/o filter With filter Limit Figure 8.15: Comparison of Measured output DM emissions: without and with output EMI filter (240V-50Hz to 168V-100Hz) 109
CHAPTER 8: FILTER REALIZATION AND EXPERIMENTAL RESULTS I [dBµA] 100 80 60 40 20 0 −20 0.1 1 10 Frequency [MHz] w/o filter With filter Limit Figure 8.16: Comparison of Measured input CM emissions: without and with output I [dBµA] 100 80 60 40 20 0 EMI filter (240V-50Hz to 168V-50Hz) −20 0.1 1 10 Frequency [MHz] w/o filter With filter Limit Figure 8.17: Comparison of Measured input CM emissions: without and with output EMI filter (240V-50Hz to 168V-100Hz) 8.3.3 Influence of the modulation index q on the emissions This last section of measurements reports the emissions for different values of the modulation index, again for an aircraft grid at 115Vrms, 400Hz and a standard one at 240Vrms, 50Hz. For the aircraft supply the six measured cases are grouped in table 8.1, while table 8.2 reports the cases for the standard grid. 110
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EMI Filter Design for Matrix Conver
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that may involve long Finite Elemen
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CONTENTS 3.1 Introduction . . . . .
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CONTENTS B External DLL 118 B.1 C c
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LIST OF FIGURES 2.10 Measurement at
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LIST OF FIGURES 6.9 CM Conducted EM
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LIST OF FIGURES 8.18 Input CM and D
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LIST OF TABLES 7.9 Attenuation for
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CHAPTER 1: INTRODUCTION the receive
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CHAPTER 1: INTRODUCTION Abs. Magnit
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CHAPTER 1: INTRODUCTION Figure 1.5:
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CHAPTER 1: INTRODUCTION • Make th
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CHAPTER 1: INTRODUCTION Figure 1.10
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CHAPTER 1: INTRODUCTION the filters
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CHAPTER 1: INTRODUCTION experimenta
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CHAPTER 2 Experimental implementati
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CHAPTER 2: EXPERIMENTAL IMPLEMENTAT
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CHAPTER 3: HF MODELLING STRATEGY im
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CHAPTER 3: HF MODELLING STRATEGY ci
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CHAPTER 3: HF MODELLING STRATEGY Re
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CHAPTER 3: HF MODELLING STRATEGY De
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CHAPTER 3: HF MODELLING STRATEGY C2
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CHAPTER 4: MOTOR AND MATRIX CONVERT
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5.1 Introduction CHAPTER 5 EMI Meas
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Page 131 and 132: APPENDIX A Scientific Publications
Page 133 and 134: B.1 C code APPENDIX B External DLL
Page 135 and 136: APPENDIX B: EXTERNAL DLL Tseq_Pulse
Page 137 and 138: APPENDIX B: EXTERNAL DLL B.2 MAST c
Page 139 and 140: References [1] RTCA Incorporated. R
Page 141 and 142: REFERENCES nious drives. In Europea
Page 143: REFERENCES [48] D.F. Knurek. Reduci
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