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BQ501210: Guidance for 15W WPT with BQ 501210 EVM and BQ51025

Needhu Gunasegaran
Intellectual 2890 points
Part Number: BQ501210
Other Parts Discussed in Thread: BQ51025, , BQ500215, BQSTUDIO

Hello Team,

My MM customer has a question on the implementation of 15W WPT.

He is using the BQ501210 EVM as the transmitter and BQ51025 as the receiver.
The transmitter I/p current is not exceeding 100mA, and the voltage on the receiver is collapsing when loaded. Also, the receiver is working in 5W receiver mode. The PMODE pin is always high on the receiver.

Thank you.


Best Regards,

Needhu.

  • 0
    TI__Guru* 75556 points

    Hi Needhu

    Check the input voltage to bq501210.  For best results it should be 19V.

  • 0
    Prodigy 70 points
    Hi,

    I am the customer with this problem and I like to give some more detail on my setup. As a transmitter I am using the bq501210 EVM. On the receiver side I am using the bq51025 chip with the output voltage of 7V and maximum current of 1.4A. On the output pin of the bq51025 I put a battery (3.7V / 10Ah) charger where I can change the maximum charging current. When I am doing a slow charging with only 500mA than my setup is working and on the v_out of the bq51025 i measure the 7V and PMODE is about 4V. When I increase the charging current to 1A. Than wireless power stops and restarts. As far as I could see the PMODE pin is allways high.

    My guess is that my receiving system is not switch to 10W Rx mode. Is there a way to force the 10W mode or do something elese to change for the 10W mode.

    Kind regards,
    Gregor
  • 0 in reply to Bill Johns
    Prodigy 70 points
    Hello Bill,

    my power supply is using 19V and a maximum current of 2A.

    Kind regards,
    Gregor
  • 0 in reply to Gregor Liebscher
    TI__Guru* 75556 points
    Hi Gregor
    The PMOD high on RX side is an indication unit is not going into 10W mode, stuck in 5W mode.
    On the TX EVM check JP1 Loss header in lower left it needs to have a shorting jumper in place. If FOD is not enabled the TX will not enter 10W mode.
  • 0 in reply to Bill Johns
    Prodigy 70 points
    Hi Bill,

    yes I have this shorting jumper. Is there a way to change to the 10W mode manually or is everything done only automatically?

    Kind regards,
    Gregor
  • 0 in reply to Gregor Liebscher
    TI__Guru* 75556 points
    No do not have the option to force into 10W mode. Things on the TX side that will prevent 10W mode are input power and FOD.
    TX will receive a packet from RX identifying as a bq51025 then the TX will send and FSK signal to RX acknowledging and ID as a 10W TX.

    Is the TX green LED flashing at fast rate ( 2.5Hz) indicating the TX is in 10W mode?
    The 5W mode LED will flash slow at (0.625Hz).

    If the RX does not receive the FSK signal from TX it will not enter 10W mode.
  • 0 in reply to Bill Johns
    Prodigy 70 points
    Hi Bill,

    when ever I try the charging the LED flash in the slow mode. But today I could see 2 times that the LED is flashing with a fast rate (it seems a little bit like an accident as I can not really repeat the setup). Still when ever I try to increase the current drawn from the bq51025 the pwoer transmission stops and it tries to reinitialize the WPC connection.

    I am wondering if I have a problem with my schematic. Would it be helpful if I send you my schematic?

    Kind regards,
    Gregor
  • 0 in reply to Gregor Liebscher
    Prodigy 70 points

    Okay i just found my problem. I had a problem with my Rx coil. After I changed the coil my hardware always goes into the 10W mode and I can increase the current drawn from the Vout of the bq51025. But now I have the problem, that I don't see any received power in the bqTESLA TX Tuning Tool. I can see that the input power is rising to more than 10W and I can see that the Loss is rising when I increse the charging current but now received power. So what can I do to read the received power with the tuning tool?

    What inductande range can I use to transmitt the 10W? Is it limited to about 15µH? I only have limited space for the coil, so I need to test different coils.



    Kind regards,
    Gregor

  • 0 in reply to Gregor Liebscher
    TI__Guru* 75556 points

    I can review the schematic please send.

  • 0 in reply to Gregor Liebscher
    TI__Guru* 75556 points
    The bqTESLA TX Tuning Tool will not support Received Power message on the bq500215 and bq501210. For higher power units a two word message is used and this is not supported by this tool.
    We will replace the Tuning Tool with bqStudio, this is in work but not ready yet.
    The Received Power message is nice to have but not needed. The Tuning Tool will be used for FOD calibration and only piece of info needed is the Loss calculated by the TX, GUI will show this as Parasitic Loss Calculation.

    Note that FOD Calibration cannot be done with standard EVMs, FOD RX or TX from Avid Technology should be used.