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TI Home » TI E2E Community » Support Forums » Power Management » Wireless Power » Wireless Power Forum » bq500110EVM-688 eval module
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bq500110EVM-688 eval module

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ken krone
Posted by ken krone
on Aug 10 2011 12:54 PM
Prodigy10 points

the bq500110EVM eval kit docs (SLVU429A) includes schematics ....the lower left portion of page 7 shows continuation of a demodulation circuit with an input from COIL_CURRENT which then connects to a couple of back-to-back schottky diodes....

 seems like the diodes attempt to optimize the dc bias for the op amps as a function of the input modulation... anyone have a more enlightened explanation of what they do ?

 

bq500110EVM
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  • Bill Johns
    Posted by Bill Johns
    on Aug 11 2011 14:03 PM
    Verified Answer
    Verified by Bill Johns
    Genius12300 points

    The Circuit is used to shift the DC level of the AC signal.  The bq500110 will not accept an input below ground.

    I would recommend switching to our new 2ed Generation bqTESLA Transmitter, bq500210.  This device will used digital filtering to reduce parts count and provide improved performance.   The external analog filter used in bq500110 is not required.

    Best Regards,

    Bill Johns,  Applications Engineer

    bqTESLA Wireless Power Products

    Texas Instruments Inc

    Dallas, Texas

    bqTESLA
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