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TIDA-00329

gianluca peterle
Intellectual 475 points
Other Parts Discussed in Thread: BQ500212AEVM-550, BQ51003

Good morning, I modified the BQ51003-764 EVM, just for the resonant circuit, to fit TIDA-00329 requirements, specifically I take out the resonant capacitors (C1, C2,  C3, C4, C5).

I tried to transfer energy from BQ500212AEVM-550 but nothing happen.

My question is: where are the resonant capacitors on the TIDA-00329?

Best Regard.

  • 0
    TI__Genius 14890 points

    Gianluca,

    The resonant capacitors tie the incoming AC1 signal to the bq51003.  If you remove the capacitors, you must short across the capacitor pads.  Was this done?

    TIDA-00329 removed the resonant capacitors to reduce required board space and uses it's self-resonance instead of the resonant capacitors.  As a result, it may not work with all transmitters and the efficiency may be a bit lower than with the capacitors.

    Regards,

    Dick

  • 0 in reply to Dick Stacey
    Intellectual 475 points
    Thank you Dick, I forgot the 0 ohm resistor.
    I observed that the current from my power supply equipment, encrease quickly to 1.25A, after that it goes in protection mode, why?
    And do you thing should be better to add resonant capacitor that fit TDK 27 uH coils?
  • 0 in reply to gianluca peterle
    TI__Genius 14890 points

    Gianluca,

    I believe I was not clear in my previous post.  The capacitors in the AC1 line (C1, C2 and C3) must be shorted.  The capacitor between AC1 and AC2 (C4 and C5) can remain open.  Shorting these would short the coil completely.

    If you plan on a Qi certified solution for your receiver then the resonant capacitors are required (C1-C5) with the proper tuning based on the coil inductance.  If you have a controlled configuration (you develop the RX and the TX) then the resonant capacitors can be eliminated - based on your evaluation results.

    Regards,

    Dick