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How Would You RoadTest This Wireless Power Dev Kit?

rscasny

I'm often contacted my suppliers who are considering to participate in the RoadTest program. They ask me a lot of questions about the program and which products are the best to RoadTest. Well, it depends, right? Test equipment garners a lot of interest. So do SBCs or anything to do with IoT. So when I was contacted about this Wireless Power Dev Kit for a future RoadTest, I looked up what content the community already had on the topic. There is a some content, as expected, since wireless power solutions are only sure to grow. But I don't recall doing a RoadTest on this type of product, or at least recently. I just wondered how it would be RoadTested. So, here's my question: How would your Roadtest it?image

 

Here's a few facts about the product:

  • It's the result of the joint collaboration of Wurth Elektronik and Rohm Semiconductor.
  • It's used in devices with a large number of mating cycles to avoid connector damage such as smartphones, tablets, portable media players.
  • It comes with 5 parts: Transmitter module, Receiver module, LED load module, Quick start guide, Power adapter with EU, US and UK adapter.

 

Here's a few specs:

  • Plug & play wireless power design kit, medium power solution
  • Qi standard version 1.2 compliant with extended power profile
  • Based on the transmitter type MP-A7
  • Excellent performance due to use of litz wire coil
  • Operating temperature range from -20°C up to +105°C
  • Inductance of 12µH at 125KHz/10mA, Q-factor of 33 at 125KHz/10mA
  • Maximum rated current of 3A at ΔT = 40K, saturation current of 6A (typ)

 

More Information

Datasheet

Product Info

 

Here's a few More Photos:

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Parents

  • Hi Randall,

     

    There was an interesting idea that Monty Chan (aka COMPACT) had during the first wireless road test that I thought was interesting.

     

    He did some testing by doing some remote charging through a glass window.

     

    That got me thinking about using the device to charge IOT devices, both inside and outside the house by just putting the charger up to the window to access the coil on the IOT device.

    You could do this with cameras, microphones, PIR sensors, night lights, and all types of sensors.

     

    So how about an remote IOT device charging challenge?

    People could identify the IOT device, where it is remotely located and how it could benefit from periodic wireless charging.

     

    Could be fun.

     

    DAB

  • in reply to DAB

    In the 'beyond the phone' challenge I build a charger for a remote controlled toy car, based on the predecessor of this kit. Being able to transfer a lot of energy of larger distances (and even when the receiver is not placed perfectly on the transmitter) was quite important there. This would be something to test - under which circumstances (distance, orientation, displacement, materials in-between) can you still get a reasonable amount of energy transferred? Can you really transfer 15W without heat problems (the manual says it does only 10W out-of-the-box and must be modified for 15W, tough)?

  • in reply to hlipka

    Not withstanding the desire to test this one, I thought someone did the distance v energy comparisons.

    It was quite interesting that the horizontal alignment was equally important and the inital handshaking was the crucial part of the misalignment distance.

     

    One thing to bear in mind with this kit was the external signal from the charger.

    I used it to detect if the device was removed and signal to the server it was 'offline' and may not receive updates.

     

    The discussions we had with Wurth before the Beyond the Phone challenge started was very rewarding.

    I helped a school project that was looking at technology to assit the elderly, and lead me to suggest using the technology to charge their devices.

    I find it hard enough to sort out which way up the micro usb goes, and they are rather fragile, so anything that eliminates that problem is a blessing.

     

     

    Mark

Reply
  • in reply to hlipka

    Not withstanding the desire to test this one, I thought someone did the distance v energy comparisons.

    It was quite interesting that the horizontal alignment was equally important and the inital handshaking was the crucial part of the misalignment distance.

     

    One thing to bear in mind with this kit was the external signal from the charger.

    I used it to detect if the device was removed and signal to the server it was 'offline' and may not receive updates.

     

    The discussions we had with Wurth before the Beyond the Phone challenge started was very rewarding.

    I helped a school project that was looking at technology to assit the elderly, and lead me to suggest using the technology to charge their devices.

    I find it hard enough to sort out which way up the micro usb goes, and they are rather fragile, so anything that eliminates that problem is a blessing.

     

     

    Mark

Children
  • in reply to mcb1

    Yeah, it was me doing all these comparisons. When you design something to be used by kids you cannot expect totally exact handling, that why it was important to me.

    I also did something similar with usage detection - I added a current measurement to detect when charging the RC car was finished (because then the input current was dropping, and I could signal end-of-charge).