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Technical Support and Design Advice...

ssilberhorn

If you have technical questions or need design advice please post here or visit the TI E2E Support Community

 

Dear Group Members please feel free to help each other and offer advice.  We encourage you to work together to design the most innovative and creative projects.

 

Regards,

Shawn

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  • Hi Shawn,

     

    I am curious, has anyone done a full energy transfer calculation on the efficiency of wireless power verses the standard battery recharge circuit?

     

    If you want this approach to work, you need to establish if it is cost effective.  I worry about the power losses verses the speed to charge.

    Has it been tried with super capacitors?  That might be a better approach for fast and efficient charging.

     

    Just a thought,

    DAB

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  • Hi Shawn,

     

    I am curious, has anyone done a full energy transfer calculation on the efficiency of wireless power verses the standard battery recharge circuit?

     

    If you want this approach to work, you need to establish if it is cost effective.  I worry about the power losses verses the speed to charge.

    Has it been tried with super capacitors?  That might be a better approach for fast and efficient charging.

     

    Just a thought,

    DAB

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  • in reply to DAB

    Hi DAB,  probably best to view the Qi WPC comments on efficiency of wireless power...  http://www.wirelesspowerconsortium.com/technology/transfer-efficiency.html

     

    If you find anything on the use of "super capacitor" and wireless power please feel free to share...

     

    " The figure shows that...

    • The efficiency drops dramatically at larger distance (z/D > 1) or at a large size difference of the coil (D2/D < 0.3)
    • A high efficiency (>90%) can be achieved at close distance (z/D < 0.1) and for coils of similar size (D2/D = 0.5..1)"

     

    http://www.wirelesspowerconsortium.com/data/images/1/2/figure2.jpg

  • in reply to ssilberhorn

    Thanks Shawn,

     

    The website link is indeed a very good place to get information about wireless charging.

    I was impressed with the depth and breadth of information.  Plus they did answer the question I had about the full power usage to recharge a battery.

    I intuitively knew that the current wall wart chargers were not efficient, which was why I questioned the efficacy of the wireless approach.

    Now that I can see the benefits, though mostly due to better charging control, so making the change makes sense just from that improvement.

     

    DAB