EMC in automobiles

Goals

The objectives of the training EMC in automobiles :

At the end of this training course, trainees will be able to design and integrate electronic modules in automobiles, taking into account coupling modes and limiting the effects of various sources, including radio interference.
• 06 to 08.10.2026 - Trappes

The aim of this training course is to:

• Know how to assess the EMC environment inside and outside the vehicle


• Be able to identify the EMC risks of ESAEs based on the source of disturbance inside or outside the vehicle


• Know how to choose the EMC shielding and filtering solutions to be implemented


• Be familiar with the regulations in force for a vehicle and an SEEE

Program

1. Introduction – Overview
Origins of EMC
Conduction and radiation
Electromagnetic fields
Decibels
The two modes: common-mode and differential-mode
EMC in the automotive sector
Common EMC issues in the automotive sector
In-vehicle EMC
Narrowband and wideband spectrum
Time-to-frequency conversion
Electronics overview


2. Regulations/strong>
UN Regulation R10
R10: applicability to ESA
R10: vehicle type-approval
Manufacturers’ EMC specifications
Standards used in manufacturers’ specifications
Vehicle and ESA test trees
R10: radiated emission levels
R10: immunity tests and levels
BCI
Immunity to pulses ISO 7637-2
Electrostatic discharge tests
Tests on electric vehicles in charging mode


3. EMC environment/strong>
Radiated power of a transmitter
Intense radio fields in a vehicle
Electrostatic discharges
On-board network disturbances


4. Sensitivity of logic and analogue circuits/strong>
Disturbance of an analogue circuit
Envelope detection
Circuit response to RF interference
Static margins of common logic circuits
Equivalent frequency of common logic circuits
Characterisation of the inputs and outputs of an op-amp


5. Ground-loop interference/strong>
Impedance of cylindrical conductors
Coupling via a common impedance (C.I.C.)
Impedance of copper and steel planes
HF impedance of printed circuit traces
Critical grounding points in vehicles
Exercise: common-impedance interference
Layout of analogue / digital / high-current circuits
Installation cable harnesses
Star-shaped 0V distribution: consequences and solutions
Equipotentiality
Ground plane of printed circuit boards
Equipotentiality between motherboard and daughterboard
Mixed analogue/digital boards


6. Conducted immunity protection/strong>
Immunity of digital links in vehicles
Common-mode/differential-mode conversion
Symmetrical differential link
Galvanic isolation: role and limitations
EMC filtering in automotive applications
Filter structure
Implementation of filter capacitors
Errors to avoid when implementing filters
Common-mode chokes
Ferrites
Special case of power supply filtering
Filtering a CAN bus
Shielded cables: principle, role, limitations
Implementation of shielding
Case of low-frequency common-mode
Ferrites
Special case: power supply filtering
Filtering a CAN bus connection
Shielded cables: principle, role, limitations
Implementation of shielding
Low-frequency common-mode interference
Shielded connectors: selection and implementation


7. Switch-mode power supplies/strong>
The 5 types of interference generated by a switch-mode power supply
Conducted common-mode interference
Input filtering
Processing the output of converters
Converters and power supplies in the automotive sector
Radiation from switching electronics
Filtering/processing of small electric motors and their controls
Special case of mechanical contact openings


8. Crosstalk/strong>
Capacitive and magnetic crosstalk: analysis
Wire-to-wire capacitive coupling
Wire-to-wire inductive coupling
Crosstalk reduction using a ground plane


9. Capacitive coupling between board and chassis/strong>
Capacitive coupling between board and environment
Propagation of high-frequency disturbances
Shielding effect of a ground plane
Connecting 0V to the chassis


10. Loop-to-field / wire-to-field coupling/strong>
Propagation of electromagnetic fields
Magnetic field-to-loop coupling
Loop voltage in a cable