RF Pollution From Electric Vehicle Wireless Chargers

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VERON reports IARU Region-1 President Don Beattie, G3BJ, is ringing the alarm on WPT-EV. WPT-EV stands for Wireless Power Transmission for Electric Vehicles, wireless car chargers with high power 20 kW! 

A translation of the VERON post reads: 

Don says, “The discussions about WPT-EV have reached a point where they are moving from the technical to the political arena. Discussions with a national regulator indicate that we must now take action at the national level. The amateur service, but also other telecommunication services will experience the consequences of WPT-EV.”

Don continues: “I ask the associations to write to their national regulator and preferably explain in person why radio amateurs are so concerned. Because the long charging time with WPT-EV, the location close to houses and the large amount of harmonics produced, radio communication in the built environment can become very difficult. Models show that this also applies to the wider environment of a WPT-EV installation. Broadcasters, stationary and mobile services share these concerns. They provided input for this in Report 289.”

Don Beattie adds, “In the interests of the future of amateur radio, we need to get the attention of national regulators. So will you please take action? ” Don is on hand to assist national associations should they require further documentation. “This is about the future of amateur radio!”

The discussion about WPT-EV has been going on for a long time. We already published about it in 2018 and the discussion continued in 2019. In particular at the World Radiocommunication Conference 2019 (WRC-19), the interference caused by WPT-EV was an important item on the agenda for radio amateurs.

The wireless charging of electric cars is done with large coils. One of them on the ground under the vehicle, the second in the car. Typically about 22 kW is transferred wirelessly through those coils. This is done with frequencies between 79 and 90 kHz. Technical and operational standards for WPT-EV are under development. The results of early studies in Europe are recorded in CEPT ECC report 289 : “Wireless Power Transmission (WPT) systems for electrical vehicles (EV) operating within 79-90 kHz band”. The message from the report is clear: radio communications services, not just radio amateurs, see a major threat to their work. And that because of the expected high level of unwanted radiation from WPT-EV. In short, it doesn’t look good.

The graph shows that the emissions defined by the CEPT and ITU at 10 m distance are about 30-45 dB above the current noise levels. Imagine a street where a car is charging every 10 meters. What do you think that means for radio reception? Unfortunately, the WPT-EV developers in CISPR are asking for these kinds of limits. Limits, which have a serious negative effect on the radio spectrum.

WPT-EV developers state that current noise levels have long been above ITU-R P.373-13 levels. However, extensive measurements in Germany show that the above-mentioned levels are still largely relevant

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