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Original question:

[FAQ] Startup Troubleshooting for Wireless Power RX

BQ51050B: charge auto-restart

RENATO VILLATA
Prodigy 30 points
Part Number: BQ51050B

Hello everyone,

using BQ51050B on a Qi compliant wireless charger, It seem that, after the charge terminates for battery charged (based on resistor on TERM pin), the charge
don't restart if the battery level drops in the next time.

The only mode i found to restart the charge is to remove and repositioning the device from/on the charger.

Any idea to have an auto-restart of the charge?

PS I try by floating the TERM pin, but the base detected this as error after a while at end of charge.

Thank you for any advice.

  • 0
    TI__Guru* 75656 points

    Hello

    The transmitter response to Charge Complete (EPT01) will vary from manufacture to manufacture.  Yes all will stop power transfer as required but when to restart and check with the receiver is determined by manufacture.  The TI based transmitters will check every 5 sec (units are now NRND). 

    I have seen some popular units that will wait 10 min to 15 min before powering back up and checking the receiver.

    Which unit are you using?

    The receiver is limited on what it can do in this situation, can only release the charge complete condition.  But need transmitter to power up and check the receiver.

  • 0 in reply to Bill Johns
    Prodigy 30 points

    Hello,

    Thank you very much for your answer.

    We are using CHOETECH T511 and T511-S.

    I would be grateful if you could show me some examples of transmitter you are referring to.

    As alternative, do you think it's possible or have some idea to "emulate" or "force" the receiver removal and reposition by some harware action on the circuit?

    Can the EN2/AD pins be used to the purpose (we don't have other power sources on AD pin)?

    Best Regards.

  • 0 in reply to RENATO VILLATA
    TI__Guru* 75656 points

    Hello

    Another TX to try is the TYLT VU SOLO or TYLT VU, they are based on TI IC and will ping the RX at regular rate (about 5 sec) to see if it needs charge topped off.

    Detect RX removal, not sure which approach this manufacture uses but often a low power ping is used.  The ping amplitude will change with RX present or not.

    No active circuits on RX are used, function of L and C basically the Q of un-powered circuit.  One approach would be to look at changing the L or C with a switch circuit that is under the external control. 

    The AD would not work this would be the powered portion of operation.

  • 0 in reply to Bill Johns
    Prodigy 30 points

    Hello Bill,

    appreciate your advice.

    About "TYLT VU SOLO": it seem to be hard to find and very expensive (I'm based in Italy). I'll start a search...

    In parallel I will try some hw solution to change the coil L/C to simulate the RX removal.

    Thank you very much for your support.

    Best regars.

    Mr. Renato Villata, Project Engineer in WAY Srl, Turin, Italy