/challenges-projects/design-challenges/wireless-power-ii/b/blog/posts/waterproofing-marine-equipment---04---efficiency-testsThis last week I have been busy doing some tests to the wireless power kit. The first thing I wanted to measure was the efficiency. I decided to measure efficiency from 0 to 1.2 Amps of output current in steps o 100mA. Obviously efficiency...en-USTelligent Community 12https://community.element14.com/challenges-projects/design-challenges/wireless-power-ii/b/blog/posts/waterproofing-marine-equipment---04---efficiency-testsFri, 04 Apr 2014 12:28:31 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:c816034f-608e-40d7-bf71-1c9f237315f4mcb10<p>jeez guys</p><p>I&#39;m starting to wonder about the other measurements now&nbsp; .. (the electrical ones) ..<span>[View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-c816034f-608e-40d7-bf71-1c9f237315f4/contentimage_5F00_938.png:16:16]</span></p><p>&nbsp;</p><p>This is really good material for anyone wanting to design or use wireless charging.</p><p>Its helped me to make decisions about what sort of charging pad I need, and the material to make a new rear panel, in order to keep the efficiency up.</p><p>&nbsp;</p><p>Well done</p><p>mark</p><img src="https://community.element14.com/aggbug?PostID=22095&AppID=115&AppType=Weblog&ContentType=0" width="1" height="1">https://community.element14.com/challenges-projects/design-challenges/wireless-power-ii/b/blog/posts/waterproofing-marine-equipment---04---efficiency-testsThu, 03 Apr 2014 20:45:29 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:c816034f-608e-40d7-bf71-1c9f237315f4hlipka1<p>Thanks for this evaluation - the graphs look much nicer than my ugly tables <span>[View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-c816034f-608e-40d7-bf71-1c9f237315f4/contentimage_5F00_1.png:16:16]</span> Btw - you wre wrong in relying on me&nbsp; that the base is 1 mm thick. I did just estimate that too. But your post just prodded me to really measure it. Just add something of known dimension to it (I used 1 mm wire), and use calipers. Now I know its 2 mm thick...</p><p>Regarding the last graph: the trasnmitter changes its transmit power with reagrd to the diatanxce of the coils, and the power needed by the receiver. So the magnetic coupling of the coils will affect that. I too saw that a distance of 1 mm (or 2, for that matter ;-) affects the performance.</p><p>Btw: should the third distance not be 8.5 mm ( 3.5 + 5 )?</p><img src="https://community.element14.com/aggbug?PostID=22095&AppID=115&AppType=Weblog&ContentType=0" width="1" height="1">