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BQ51010B: Unable to receive wireless power transmitted through BQ50002EVM-607 and trying to receive using custom made receiver

Muhammad Akram Karimi
Prodigy 245 points
Part Number: BQ51050B
Other Parts Discussed in Thread: TPS63051, BQ51010B,

Dear All,

I am trying to make a custom wireless power receiver (altium project attached) using BQ51010B and TPS63051 buck boost regulator to get 3.3V output.

I have thoroughly reviewed the documentation of both the ICs and selected the components as recommended. To get charge current (I_BULK) of 0.5A; I have selected R_ILIM. I am using 7.5uH (732-6211-ND) coil from Wurth.

Seemingly there is not much complication in the circuit but when I tested my Rx circuit with the BQ50002EVM-607; I get no voltage on BAT (pin4) of BQ51010B and neither obviously I am not getting anything at the output of TPS63051 as well.

Also I have some specific questions as well:

1. I have noticed a mistake in the design that I am trying to put the Rx Coil directly on the AC1 and AC2 terminals of the chips and the resonant caps are being bypassed. So my question is; what is the role of these resonant caps; are they really important that if we bypass them; we won't receive any power? Any literature on this?

2. I have not put any rechargeable battery or the load, I think the output voltage should have still be appeared. Right?


Can anyone please have a lot at my schematic and suggest me where the problem might be.

Thanks for your time.

6472.WPT Rx Files.zip

  • 0
    TI__Guru 65746 points
    Could you double check the device number, bq51010B is a 7V output wireless power RX and the bq51050B is a battery charger?
    The coil is Wurth p/n 760308103206, above p/n is the Digi-Key Part Number, I think you are OK it is a large coil. What is the coil to coil distance?
    Could you send a schematic of the ckt?
    Also take a look at the FAQ section, it has a TX trouble shooting guide that will give some info on waveforms.
  • 0 in reply to Bill Johns
    Prodigy 245 points

    Dear Bill,
    Sorry for the mistake; I am using BQ51050BRHLR .All Altium Files are attached in the zip file in the original post. I am just putting the coil on top of the Tx Coil of the 50002-EVM. Distance would be less than 1-2 mm.


    Thanks

  • 0 in reply to Muhammad Akram Karimi
    Prodigy 245 points
    Hi Bill,
    Sorry for the mistake; I am using BQ51050BRHLR .

    Thanks
  • 0 in reply to Bill Johns
    Prodigy 245 points

    Dear Bill,

    Did you get a chance to look into my schematic attached in the zip file in the original post? Did you notice any mistake?

    Looking forward to your help

  • 0 in reply to Muhammad Akram Karimi
    TI__Guru 65746 points
    Also I have some specific questions as well:

    1. I have noticed a mistake in the design that I am trying to put the Rx Coil directly on the AC1 and AC2 terminals of the chips and the resonant caps are being bypassed. So my question is; what is the role of these resonant caps; are they really important that if we bypass them; we won't receive any power? Any literature on this?
    Bill J--They are needed we have seen problem with communications if they are not present

    2. I have not put any rechargeable battery or the load, I think the output voltage should have still be appeared. Right?
    Bill J--For the battery charger to start it will need to see a voltage on the output, best to add a battery or battery emulator, see below.
    Voltage needs to be about 3.6V, below 3V and it is in pre-charge with low current, only a capacitor on the output will charge up to 4.2V quickly and enter charge complete.

    If unit does not start send scope capture of voltage at RECT (pin 18).


    Info on Li-Ion Battery Emulator:
    e2e.ti.com/.../342031
    lskdjf