Automotive EMI measurements with multichannel time-domain systems
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1 Automotive EMI measurements with Ferran Silva, Marc Aragón, Marc Pous, Marco Azpúrua Universitat Politècnica de Catalunya, Barcelona, Spain
2 1. Introduction 2. Full Time-Domain EMI receiver 3. Multiple measurements in the lab 4. EV charger characterization 5. On road EMI measurements 6. Summary
3 1. Introduction 2. Full Time-Domain EMI receiver 3. Multiple measurements in the lab 4. EV charger characterization 5. On road EMI measurements 6. Summary
4 1. Introduction TARGET: To develop new EMI measurements methods suitable for difficult situations
5 1. Introduction ONLY DURING 5 SECONDS MOST OF THE TIME
6 1. Introduction 20 minutes MAX HOLD with an EMI receiver! Milliseconds acquisition with an oscilloscope SOLUTION: TIME-DOMAIN MEASUREMENTS But in industrial installations cheap and robust systems are required
7 1. Introduction FULL TDEMI: Full Time-Domain EMI measurement system based on general purpose oscilloscopes FAST CHEAP MUTICHANNEL (synchronous) TRIGGER (oscilloscope) FULL TIME-DOMAIN DATA (Module & Phase in freq.) PEAK, AVE & QP from one meas. FULL CISPR COMPLIANT ROBUST INPUTS (oscilloscope) ANY FREQ. RANGE (oscilloscope)
8 1. Introduction FULL TDEMI: Full Time-Domain EMI measurement system based on general purpose oscilloscopes FAST ARE Full TDEMI RECEIVERS USEFUL IN AUTOMOTIVE EMC? Wiper in an EMC lab EV on board charger Start/stop car on road EV on road CHEAP MUTICHANNEL (synchronous) TRIGGER (oscilloscope) FULL TIME-DOMAIN DATA (Module & Phase in freq.) PEAK, AVE & QP from one meas. ROBUST INPUTS (oscilloscope) ANY FREQ. RANGE (oscilloscope)
9 1. Introduction 2. Full Time-Domain EMI receiver 3. Multiple measurements in the lab 4. EV charger characterization 5. On road EMI measurements 6. Summary
10 2. Full Time-Domain EMI receiver Full TDEMI Based on Picoscope 5444B 4 CHANNELS 200 MHz COND and RAD EMI USB Power Supply (2CH) Inputs max voltage 300 V Full compliant with CISPR
11 1. Introduction 2. Full Time-Domain EMI receiver 3. Multiple measurements in the lab 4. EV charger characterization 5. On road EMI measurements 6. Summary
12 3. Multiple EMI measurements in the lab Based on CISPR 25 setup TWO LISNs CURRENT PROBE WIPER (EUT) BICONIC with preamp 4 channels 100 ms TIME DOMAIN synchronous acquisition -90 seconds post-processing (notebook)
13 3. Multiple EMI measurements in the lab Wiper normal operation LISN MHz LISN MHz Biconical 200 MHz CM current 110 MHz
14 3. Multiple EMI measurements in the lab Wiper switch-on (trigger) PEAK BICONICAL radiated EMI Time-Domain CM current wiper normal operation Time-Domain CM current wiper switch-on TRIGGER
15 3. Multiple EMI measurements in the lab From the same Time-Domain measurements: wiper switch-on QUASI-PEAK normal operation wiper switch-on AVERAGE normal operation BICONICAL radiated EMI
16 1. Introduction 2. Full Time-Domain EMI receiver 3. Multiple measurements in the lab 4. EV charger characterization 5. On road EMI measurements 6. Summary
17 4. EV charger characterization working mode 3000 W MAINS LISN VOLTAGE PROBE AUTO LISN CONDUCTED EMI mains 150 khz 30 MHz RBW=9 khz sleep mode
18 EMI SPECTRUM - Voltage (dbµv) EMI SPECTRUM - Voltage (dbµv) EMI SPECTRUM - Voltage (dbµv) EMI SPECTRUM - Voltage (dbµv) EMI SPECTRUM - Voltage (dbµv) 4. EV charger characterization CONDUCTED EMI mains + vehicle 10 khz 110 MHz 110 Mains L Peak Mesura05 L Mains N MAINS LISN AUTO LISN Peak Mesura05 N Two LISNs (4 channels simultaneously) 110 Vehicle (+) RBW=9 khz / 120kHz (post processing) Peak Mesura05 Positiu Vehicle (-) Peak Mesura05 Positiu Peak Mesura05 Negatiu
19 EMI SPECTRUM - Voltage (dbµv) EMI SPECTRUM - Voltage (dbµv) EMI SPECTRUM - Voltage (dbµv) EMI SPECTRUM - Voltage (dbµv) EMI SPECTRUM - Voltage (dbµv) EMI SPECTRUM - Voltage (dbµv) 4. EV charger characterization 110 Mains L Peak Mesura05 L1 CM / DM calculation Mains N Mains CM Peak Differential Mode AB Peak Common Mode AB Mains DM Peak Mesura05 N Vehicle (+) Peak Mesura05 Positiu Vehicle (-) Vehicle CM Peak Differential Mode CD Peak Common Mode CD Vehicle DM Peak Mesura05 Negatiu
20 4. EV charger characterization MAINS LISN VOLTAGE PROBE 300 V OSC inputs Real filter behavior before the filter Mains
21 EMI SPECTRUM - Voltage (dbµv) 4. EV charger characterization Real filter CM / DM attenuation 120 MAINS LISN VOLTAGE PROBE COMMON MODE SIGNAL before the filter 110 COMMON MODE SIGNAL mains Peak Peak
22 EMI SPECTRUM - Voltage (dbµv) 4. EV charger characterization Switch-on transient TRIGGER PEAK switch-on transient W normal operation 50 Peak Mesura10 FiltreN Peak Mesura09 FiltreN
23 EMI SPECTRUM - Voltage (dbµv) EMI SPECTRUM - Voltage (dbµv) 4. EV charger characterization From the same Time-Domain measurement AVERAGE DETECTOR QUASI PEAK DETECTOR CISPR-Average Mesura10 FiltreN CISPR-Average Mesura09 FiltreN 3000 W normal operation W normal operation Quasi-Peak Mesura10 FiltreN Quasi-Peak Mesura09 FiltreN switch-on transient switch-on transient
24 1. Introduction 2. Full Time-Domain EMI receiver 3. Multiple measurements in the lab 4. EV charger characterization 5. On road EMI measurements 6. Summary
25 5. On Road Measurements INV START-STOP gasoline car sequence (MAGNETIC FIELD): AMBIENT / KEY CONTACT / WINDOW OPERATION / START / DRIVING /START STOP Electrical Vehicle sequence (CURRENT BATTERY _ INVERTER): AMBIENT / STAND BY / SLOW FAST ACCELERATION
26 5. On Road Measurements START-STOP gasoline car Magnetic field inside vehicle (ambient noise) Sequence measured in 5 minutes key contact window operation starting driving start/stop
27 5. On Road Measurements START / STOP
28 EMI SPECTRUM - Voltage (dbµv) EMI SPECTRUM - Voltage (dbµv) 5. On Road Measurements Electrical Vehicle Current in Battery Inverter (power supply from the notebook) STAND BY AMBIENT NOISE Peak Mesura2 Sonda I Peak Mesura1 Sonda I FAST ACCELERATION Peak Mesura4 Sonda I Peak Mesura5 Sonda I SLOW ACCELERATION
29 EMI SPECTRUM - Voltage (dbµv) 5. On Road Measurements 105 dbµv FAST ACCELERATION db dynamic range AMBIENT NOISE dbµv
30 1. Introduction 2. Full Time-Domain EMI receiver 3. Multiple measurements in the lab 4. EV charger characterization 5. On road EMI measurements 6. Summary
31 6. Summary Full TDEMI systems based on general purpose oscilloscopes are low cost EMI receivers suitable for: Conformity conducted and radiated EMI testing Oscilloscope type features (multichannel, trigger, ) helps in difficult measurement scenarios like transient EMI Easy to use in troubleshooting Full Time-Domain (module and phase) synchronous acquisitions allows post-processing: CM/DM, RBW recalculation, real filter attenuation, etc.
32 Automotive EMI measurements with Ferran Silva, Marc Aragón, Marc Pous, Marco Azpúrua Universitat Politècnica de Catalunya, Barcelona, Spain
33
34 4. EV charger characterization mains 230Vac/50 Hz Electrical Vehicle CHARGER mains filter power section vehicle Vcc EMI EMI EMI
35
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