Wireless charging efficiency - Page 1
Forum section: electronics / general

author: hamdi.tn
author_rank: Frequent Contributor
timestamp: June 01, 2017, 01:16:18 am
content: So i been reading an article (link below, in french) talking about ability of electric cars to be charged while running in highway or something using wireless charging, obviously the road will act as a huge charger (project done by an american company and financed by some European program). To me it sound like a load of crap and a waste of money, but this made me think if there is any serious study about efficiency of wireless charger compared to wired classic charger.i certainly searched for the subject, Texas Instrument documentations are all over the place and by looking at those i find it a bit biased and written in a way to prove that it's as efficient as standard charger. did anyone here designed some wireless charged products and did some efficiency measurement in the process that can share his experience.Thanks.http://www.lepoint.fr/automobile/actualites/les-vehicules-electriques-pourraient-a-terme-se-charger-en-roulant-18-05-2017-2128513_683.php

author: DerekG
author_rank: Frequent Contributor
timestamp: June 01, 2017, 02:08:57 am
content: Quote from: hamdi.tn on June 01, 2017, 01:16:18 amYes, if you take it at face value, the further you drive the more energy will be stored in your batteries. A sort of "perpetual energy".On a serious note, any magnetic field that is generated "by the car itself" will resist the movement of the vehicle's forward motion as per Newton's Laws of Motion.If the magnetic field in generated "by the highway" the highway will have to be specially built & have electricity running through it to generate the magnetic field. Presumably the supplier of the electricity will want to be paid for it by those who use it.

author: Ampera
author_rank: Super Contributor
timestamp: June 01, 2017, 08:25:54 am
content: Hah. I can see that being easy to meter. Unless you have toll roads, good luck getting someone to pay for something they already have, and you can't track.

author: hamdi.tn
author_rank: Frequent Contributor
timestamp: June 01, 2017, 10:12:27 pm
content: the project itself is a joke and much like solar roadway will never pass prototype for things like cost, unclear business model as you said who will pay for it and how. and what interest me the most how efficient will it be (this article is talking about 20Kw available for the car) ...this remind me the idea by Top gear Uk host james may several years ago when he said that they should make road generate electricity for the electric car passing by ...

author: nctnico
author_rank: Super Contributor
timestamp: June 01, 2017, 10:23:22 pm
content: Quote from: hamdi.tn on June 01, 2017, 01:16:18 amThe efficiency depends on the size of the coils and the distance. With large coils nearby you can reach high efficiencies but at high power the currents will also be high so there will be substantial copper and switching losses. BTW in a way you can see an induction heater as a wireless energy transfer device as well so the idea isn't as far fetched as you might think. But yes, the 'modern' wireless energy transfer methods for charging aren't really mainstream and people with any real hands on experience are rare even though the basic principles aren't new at all.

author: Nusa
author_rank: Super Contributor
timestamp: June 02, 2017, 01:02:17 am
content: Quote from: hamdi.tn on June 01, 2017, 01:16:18 amThe article tells you who is developing the technology. My search for "qualcomm wireless charging" got me tohttps://www.qualcomm.com/products/haloon the first try. The info you seek is there. You jumped into ridicule mode a bit too soon, methinks.

author: Nusa
author_rank: Super Contributor
timestamp: June 02, 2017, 01:19:41 am
content: Quote from: TwoOfFive on June 01, 2017, 08:25:54 amHey, if the road itself is capable of charging at a 20 KW rate, transmitting a bit of data like a license key and account number is a pretty trivial detail. At the very least there are niche markets...for instance a city metro system run with electric buses. And once a charging system is in place, you're positioned to buy electric for other vehicles. Police cruisers are an obvious example of constant use, usually used around the clock by several shifts. The long-haul trucking market might justify this for interstates someday.

author: hamdi.tn
author_rank: Frequent Contributor
timestamp: June 02, 2017, 02:00:14 am
content: Quote from: Nusa on June 02, 2017, 01:02:17 amAm not looking for info about this project.i asked for feedback from ppl who designed products and gadget using wireless charging tech.beside i saw the company working on the project , i just didn't mention them, basically it change nothing to the fact that this is a waste of money (of some european program / tax payer) a fancy web page will not make it legit.edit : FABRIC is a €9 million project, mostly funded by the European Commission, addressing the technological feasibility, economic viability, and socio-environmental sustainability of wireless DEVC. Translation : a 9million € to prove it can be done (we sure it's technologically possible) and it will end there.