Before like two years when I got my first Ladybird toy, I was thinking it will be great if I can charge those wirelessly, without changing the battery. Yes, it is charging very slow, yes it will add some weight, but it will be cool.

QI standard is going forward, and there is already some IDT chipsets available on Mouser  - TX -P9035/P9036 and RX-P9021, but according to first look on the datasheet, those are quite complicated and with a lot of external components.

In difference to those, before a month I saw some wireless charging modules, which seems to be quite cheep and simple. , 5V, option1 two bare boards , 5V option 2, TX module in single module and there is now versions for 3.3V, 9V and 12V ( I guess they just change one Zener diode on the receiver board).

Come home here in Sweden for one week after I place the order (probably because were single pcs. and quite light box). I test both, just with one LED for now (like 15mA) - they was working quite OK for distances up to 1-2cm, just some paper and thin air between TX and RX coils. With appropriate ferite it seems distance and coupling can be even better.

Just to fire further my interest, chip labels on board were erased, but fortunately I found a good picture where most of the labels were visible. Unfortunately no results after some googling, but finally I think I found the manufacturer of chips and some other wireless power/charging modules - it should be Elecoteq Electronics -  Website is only in Chinese, so I read what I can via Google translate. I found no datasheets, but for one there was some basic description

On TX board

XKT-408A wireless charging transmitter IC

T5336 wireless charging IC (I think this is just a MOSFET driver or similar)

On RX board

T3168 wireless charging receiver IC 

Last question is TX/RX coils/antennas. Even modules with antennas is quite light - 5grams with the coil and some power cables, I guess it can be even lighter with PCB antenna, either on flex or thin FR-4. On the Elcoteq website I saw some microcoils and also solutions for high current charging.

I drop a line to the manufacturer, asking for datasheet/app note about the chips - let's see if I have an answer. Until then as a desert, I reverse the schematics from the boards I already have (it is possible I missed or read wrong some connection) and attach them here - transmitter.pdf  and receiver.pdf . I check also some ot the singals on my scope - it seems the working frequency is like 55kHz. If you are better with reading Chinese, you probably will found more interesting things on Elcoteq website, may be even the right datasheets.

That is - hope it helps somebody. I think those can have a lot of applications and be a lot of fun. If you have some ideas or make some new smaller coils let me know. I probably try to enable one of my Ladybirds for wireless charging :)

p.s. hope Elecfreaks will thank me for saving them from tedious task of chip label grinding...

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Comment by Nick Tuttle on July 10, 2013 at 8:35am

For an autonomous copter or rover, this would be a great solution for a charging base. I was looking for wireless charging for my phone and see that they are using multiple smaller coils so that the location of the two does not have to be extremely precise..

Comment by Justin Stiltner on July 10, 2013 at 8:46am

This is a really great find!  Can you weigh the reciever asssembly for us?

Comment by Dimitar Kolev on July 10, 2013 at 10:09am

Hi Justin,

weight of the receiver is 5grams exactly with the coil from the picture. Elcoteq have a solution called XTK-410, with some microantennas which looking more like inductors, probably they will be if not same weight, at least 1/5 of the current coil size. I've just have been outside with my small son and a RC tank - it appears to me this will be a great solution for overnight charge, and in this tank case weight and size does not matter too much.

Comment by Muhammad Al-Rawi on July 10, 2013 at 11:52am

Thank you for sharing your finds. I've been eyeballing these for quite some time. 

Comment by Dimitar Kolev on July 10, 2013 at 1:28pm

You are welcome Muhammad, hope there will be more interesting products in the same direction. I am still waiting for the datasheets from the manufacturer, but if somebody find them in English or other language effort will be appreciated. I saw even a TX module which should work with input voltages from 5 to 450V or something like this.

Comment by Emery c. Chandler on August 5, 2013 at 6:57am

something I was looking at was wireless contact charge. we see it with certain iphones or mp3's and i was wondering if it could be done via a conductive surface on a plane or quad without adding a lot of weight. This certainly helps my studies, thank you for such a good post 

Comment by Muhammad Nauman Khan on October 28, 2017 at 8:06am

Thanks for sharing useful information. does this possible that i find these IC's from Electronics market. I mean that Chinese company provides these IC also to other countries or markets or not?


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