EMC Test and Measurement on EMC Test and Measurement on Automotive Electronic Component and Automotive Electronic Component and Sub Sub - - assembly assembly By: Jeffrey Tsang [email protected]Agenda • Common EMC Standards in Automotive Industry • EMI Measurement: CISPR25 vs 2004/104/EC • Transient Immunity Test: ISO7637-2 • Radiated Immunity: ISO11452 vs 2004/104/EC Some car manufacturer standards are included
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EMC Test and Measurement on EMC Test and Measurement on Automotive Electronic Component and Automotive Electronic Component and SubSub--assemblyassemblyBy: Jeffrey [email protected]
Agenda
• Common EMC Standards in Automotive Industry
• EMI Measurement: CISPR25 vs2004/104/EC
• Transient Immunity Test: ISO7637-2• Radiated Immunity: ISO11452 vs
2004/104/EC
Some car manufacturer standards are included
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EMC Standards in Automotive Industry
Common International Standard
Standard Area Test2004/104/EC EU Conducted & Radiated Emission
Radiated ImmunityTransient Immunity
CISPR 12CISPR 25
International Conducted & Radiated Emission
ISO 7637 International Conducted EmissionTransient Immunity
ISO 10605 International ESD
ISO 11451ISO 11452
International Radiated Immunity
SAE J1113 North America various
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Common Car Manufacturer Standards
Standard Manufacturer Test
ES-XW7T-1A278-AC
Ford Conducted & Radiated EmissionConducted & Radiated ImmunityTransient Immunity
Magnetic Field ImmunityImmunity to CouplingImmunity to Voltage VariationESD
GMW3097 General Motor Conducted & Radiated EmissionConducted & Radiated ImmunityTransient Immunity
Magnetic Field ImmunityImmunity to Voltage VariationESD
Automotive EMCAutomotive EMC
• EMI test methods mostly refer to CISPR25• 2004/104/EC conducted Emission refers
ISO7637• You can use spectrum analyzer with peak
detector• ALSE Method use different Anechoic Chamber• Narrowband and Broadband Emission concept• Products usually need to be complied with Car
• Test method is same as CISPR25• Different limit lines for different product types
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CISPR25 – on board antenna
• Use on board antenna for measuring emission
• Need a whole vehicle!!• Measure antenna disturbance voltage
Transient ImmunityISO 7637-2:2004
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ISO 7637-2:2004
• Immunity to voltage Transient• It’s a tough test to some DUT such as
car entertainment products (e.g. car audio, DVD, etc)
• The key of test setup is the pulses generator.
• The recent change from 95/54/EC to 2004/104/EC – includes ISO7637-2:2004
• Almost all car manufacturer standards include (but not limit to) ISO7637
ISO 7637-2:2004Pulse Description
1 simulation of transients due to supply disconnection from inductive loads
2a simulates transients due to sudden interruption of currents in adevice connected in parallel with the device under test due to the inductance of the wiring harness
2b simulates transients from dc motors acting as generators after the ignition is switched off
3a/b simulation of transients, which occur as a result of the switching processes. The characteristics of these transients are influenced by distributed capacitance and inductance of the wiring harness
4 simulates supply voltage reduction caused by energizing the starter-motor circuits of internal combustion engines, excluding spikes associated with starting
5a/5b simulation of load dump transient occurring in the event of a discharged battery being disconnected while the alternator is generating charging current with other loads remaining on the alternator circuit at this moment
**2004/104/EC does not include Pulse 5a and 5b
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ISO 7637-2:2004
• Pulse 15000 time causes long test time
ISO 7637-2:2004
• Pulse 2a
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ISO 7637-2:2004
• Pulse 2b
ISO 7637-2:2004
• Pulse 3a
• Pulse 3b
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ISO 7637-2:2004
• Pulse 4
ISO 7637-2:2004
• Pulse 5a
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ISO 7637-2:2004
• Pulse 5b
ISO 7637-2:2004
• Pulse 5b• Most Pulse 5b generator in the market does
not generated correct wave shape• Voltage Suppression is to be done by diode
bridge
Common problem of pulse 5b generator Diode bridge
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ISO 7637-2:2004
• Example Test Setup
y
y
Car Manufacturer Standard
• Both ISO7637-2 and ISO16750-2 are included in car manufacturer EMC standards
• ISO16750-2: voltage variation• Manufacturer standards are often more
complicated and more tests
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Car Manufacturer Standard
• Some wave shapes in GMW3097
Car Manufacturer Standard
• Some wave shapes in Nissxx28401NDS02[2]
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Car Manufacturer Standard
• Some wave shapes in XXyota TSC7021G
Radiated ImmunityISO 11452 ISO 11452 vsvs 2004/104/EC2004/104/EC
ISO 11452 vs 2004/104/ECRadiated Immunity - ALSE Example Setup
80MHz – 1GHz Setup Above 1GHz Setup
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ISO 11452 vs 2004/104/ECRadiated Immunity - ALSE Example System
Freq. Range 200MHz – 2GHz
Horn antenna Covers 200MHz –1GHz, in line with centre of test harness
Horn antenna covers above 1GHz, in line with DUT
ISO 11452 vs 2004/104/ECRadiated Immunity - ALSE Example System
Up to 18GHz, 100V/m Radiated Immunity System
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ISO 11452 vs 2004/104/ECRadiated Immunity - ALSE• No restriction on choice of antenna
– For Components and sub-assembly, prefer using high gain horn antenna to reduce power amplifier cost
• One point calibration, unlike IEC61000-4-3 and MIL-STD461E
• Unlike IEC61000-4-3, no concern on power amplifier output linearity
• Open loop test, no feed back on field strength• Test level is higher in manufacturer standards
Manufacturer Standard Radiated Immunity - ALSE
Car Manufacturers Requirement on Radiated Immunity
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Manufacturer StandardRadiated Immunity – ALSE Example System
• 1GHz – 2GHz >270V/m system
1.2kW power amplifier
ISO 11452 vs 2004/104/ECRadiated Immunity - TEM
• Test method ISO11452-3• Frequency Range 10kHz – 200MHz
• Not common in manufacturer standards
ISO11452-3 2004/104/EC
200V/m 60V/m
TEM Cell
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ISO 11452 vs 2004/104/ECRadiated Immunity - BCI• Test method ISO11452-4• Frequency Range 1MHz – 400MHz• Severity level:2004/104/EC 60mA vs
ISO11452-4 100mA
Test SetupCalibration Setup
ISO 11452 vs 2004/104/ECRadiated Immunity - BCI• Some manufacturer standards accept
extending BCI frequency up to 1GHz for replacing ALSE method below 1GHz
• Severity level usually up to 200mA
BCI System with test fixture up to 200mA
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ISO 11452 vs 2004/104/ECRadiated Immunity - stripline• Test Method ISO11452-5• Frequency Range 10kHz – 200MHz• Not exist in popular manufacturer standards anymore
2004/104/EC ISO11452-5
Stripline Heigh 150mm800mm
150mm
Field Strength 60V/m 50V/m, 100V/m, 150V/m, 200V/m
150mm Stripline 800mm Stripline
ISO11452-7
• RF Power Injection• Test Frequency 250kHz – 500MHz• Not in 2004/104/EC