EMC FLEX BLOG A site dedicated to Automotive EMC Testing for Electronic Modules

WPT Transfer Power Classess

9. July 2015 11:51 by Christian in
Magnetic Field WPT Input Power Classes (drawn from the grid)Class     &nbsp

Magnetic Field WPT Input Power Classes (drawn from the grid)

Class          
MF-WPT1
MF-WPT2
MF-WPT3
MF-WPT4
Power
P =< 3.7
3.7 < P =< 7.7
7.7 < P =< 22
P >

Interoperability is the state of the supply device and the EV enabling wireless power transfer via magnetic field in a safe and efficient manner. Power transfer is allowed to occur only when interoperability is established.

Interoperability Power Classes

 

 Primary Device

 

Secondary

Device

 MF-WPT

 1

 2

 3

 4

 1

 Required

 Desired

 *

 *

 2

 Desired

 Required

 *

 *

 3

 *

 *

 Required

 *

 4

 *

 *

 *

 Required

 * Under Consideration


Fundamental and Operation Frequencies for WPT Charging Stations

7. July 2015 20:02 by Christian in
The Europeans expect frequency ranges 20-40 kHz, 80-90 kHz, and 119-135 kHz to be reserved for prefe

The Europeans expect frequency ranges 20-40 kHz, 80-90 kHz, and 119-135 kHz to be reserved for preferred accommodation of fundamental and operation frequencies for “charging stations” for electric vehicles featuring wireless power transfer (WPT). The use of these frequency bands becomes possible via the license exempt conditions granted by Decision 2013/752/EU of the European Commission on harmonization of utilization of radio frequencies for Short Range Devices.

WPT systems and car manufacturers target for these frequency bands is compliance to:

  • Conducted Emissions C1 & C2 limits at LV a.c. mains power ports of power electronic equipment with WPT functionality as specified in IEC TS 62578 Ed. 2.0 (TC 22)
  • Radiated Emissions limits (magnetic field strength at 10 m distance) specified by Decision 2013/752/EU and EN 300 330-1&2 for WPT interface of the inductive power transfer system comprising the charging station and the electric vehicle.

Abbreviations:
CENELEC: European Committee for Electrotechnical Standardization, Brussels
CD: Committee Draft; ISO, IEC
CDV: Committee Draft for Vote; IEC
CAB: Conformity Assessment Board; IEC
CASCO: Committee on Conformity Assessment; ISO
DC: Document for Comment; EC
DIN: German Institute for Standardization, Berlin
DIS: Draft International Standard; ISO
DK: German Committee
DKE: German Commission for Electrical, Electronic & Information Technologies of DIN and VDE, Frankfurt am Main
DK-IEC: German Committee of IEC
ETSI - EN 300 330-1 PART 1: TECHNICAL CHARACTERISTICS AND TEST METHODS

  • ELECTROMAGNETIC COMPATIBILITY AND RADIO SPECTRUM MATTERS (ERM); 
  • SHORT RANGE DEVICES (SRD);
  • RADIO EQUIPMENT IN THE FREQUENCY RANGE 9 KHZ TO 25 MHZ AND INDUCTIVE LOOP SYSTEMS IN THE FREQUENCY RANGE 9 KHZ TO 30 MHZ;

GA: Gemeinschaftsausschuss (Joint Committee); DIN
IEC: International Electrotechnical Commission, Geneva
IEEE: Institute of Electrical and Electronic Engineers, New York
ISO: International Organization for Standardization, Geneva
JTC: Joint Technical Committee; ISO, IEC
TC: Technical Committee; ISO, IEC, CEN, CENELEC, ETSI
TR: Technical Report; ISO, IEC, CEN, CENELEC
TS: Technical Specification; ISO, IEC, CEN, CENELEC, ETSI
VDE: Association for Electrical, Electronic & Information Technologies, Frankfurt am Main
WG: Working Group; ISO, IEC, CEN, CENELEC

2013/752/EU: Commission Implementing Decision of 11 December 2013 amending Decision 2006/771/EC on harmonisation of the radio spectrum for use by short-range devices and repealing Decision 2005/928/EC (notified under document C(2013) 8776) Text with EEA relevance

DKE / K 353 is responsible for the development of standards for the charging of electric vehicles.  These include interface descriptions and requirements for stations for the AC-charging, DC-charging, wireless charging and battery replacement.

   Working Groups:
   DKE / AK 353.0.6    EMC in the energy supply of electric vehicles
   DKE / AK 353.0.7    Battery change systems
   DKE / AK 353.0.8    User authorization for charging infrastructure
   DKE / GAK 353.0.9   Energy supply of light electric vehicles
   DKE / AK 353.0.6    EMC in the energy supply of electric vehicles
   DKE / GAK 353.0.1   Contactless charging of electric vehicles
   DKE / GAK 353.0.2   DC charging of electric vehicles
   DKE / AK 353.0.3    Communication interface from the vehicle to the power grid (V2G CI)
   DKE / GAK 353.0.4   AC charging of electric vehicles

2015 EMC Component Level EMC Specifications for ICE automotive electronics

7. July 2015 16:08 by Christian in
So far two major NA automotive makers (FCA &amp;amp; Ford) have released updated test specifications for

So far two major NA automotive makers (FCA & Ford) have released updated test specifications for electronic components.

2015 BMW i3 AM radio is susceptible to RF interferences from electric motors

7. July 2015 15:52 by Christian in
The 2015 BMW i3 AM radio was built-in but due to some compliance issues it was disabled, therefore n

The 2015 BMW i3 AM radio was built-in but due to some compliance issues it was disabled, therefore no AM radio local traffic reports or news headlines are possible.

"AM is not offered due to negative performance influences of the electromagnetic interference of the electric drivetrain" said Rebecca K. Kiehne, a BMW product and technical communications spokesperson. Electric motors cause interference on AM which is why BMW decided to remove this option. "While it could be offered, BMW’s performance standards are very high and we don’t offer a product that meets less than those high standards."

Differences between Inductors and Capacitors

21. June 2015 14:39 by arria in
_______________________INDUCTOR______________________________________________________CAPACITOR______


INDUCTOR

CAPACITOR

The inductor is opposing to a change in current: V = L * di/dt

The capacitor is opposing to a change in voltage: i = C * dV/dt

Stores energy as Magnetic Field depending on material magnetic permeability. Energy stored = 1/2 * L*I^2

Stores energy as Electric Field depending on material electric permittivity. Energy stored = 1/2*C*V^2

Z=0 @ 0 Hz (DC); Z= infinite @ high frequencies

Z= infinite @ 0 Hz (DC); Z= 0 @ high frequencies

Current lags behind Voltage  by π/2

Voltage lags behind Current by  π/2

Series Inductors combine like series resistors.

Parallel Inductors combine like parallel resistors.

Series Capacitors combine like parallel resistors.

Parallel Capacitors combine like series resistors.