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  • Author Author: johnsocm
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Reverse Engineering 2 - Energizer Qi 2 Position Pad

johnsocm

Hello World,

 

I wanted to show you the design of the Energizer 2 Qi Position Pad.

 

This is a very interesting design and I will be making a transmitter board similar to this with the TI and Wurth Components.

 

Again, when designing a new technology or board I highly recommend looking at consumer products that are readily available if possible to make your design even better! As you can see this Qi pad has 7 transmitter coils on each side to allow for a bigger "charger spot"

 

This enables one to place an object relatively close to center, instead of directly center or a coil. This will be more useful in the final design so we do not have to make sure it is aligned as there are 7 spots to choose from. More testing will be involved later!

 

Here are the pictures:

        

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Here is some testing with two coils in parallel. I tested to see if the eval kit would work if I gave it another friendly coil in parallel. The eval receiver did not work at all. This was expected as the other coil is now acting like a load to the charging coil. The transmitter was thinking that the receiver was getting power although! I plan on taking several coils and using diodes to block the other coil's current, to enable one to use either coil as the receiver. This will be tested tonight!

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Here are my Brand New Wurth Receiver Coils Ready for CLONING!!!

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  • in reply to DAB

    DAB,

     

    That is a great idea. I do not have a device to measure the field density, but I am experimenting with a hall effect sensor. I am trying to play with it and see what kind of readings I can gather.

  • Interesting idea.

    Do you have the equipment to look at the field density over the array?  It would be really cool if you could change the charging time of a given device depending upon where you placed it on the pad.

    It would also be interesting to see a field strength map over the surface.  I will bet that it would have a very interesting profile.

     

    If you put in some capacitors, you might be able to change the phase angle on some of the coils so that you could move the maximum magnetic field around the plate, similar to a phased array radar system.  Could be fun to play with the various vector combinations.

     

    I look forward to seeing what you come up with next.

     

    DAB