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evaluating bq500215 and bq51025

sujeeva wettasinghe
Intellectual 460 points
Other Parts Discussed in Thread: BQ500215, BQ51025, BQ500210, BQ51050B, BQ500212A, BQ500412, BQ51013

 

I’m currently evaluating TI wireless charging technologies.

 

I’m specifically looking at if the 10W solution with bq500215 and bq51025 could be used for our devices.

 

The basic requirements are:

Input: 13.5V±0.5V

Output: 13.5V±0.5V

 

From the datasheets of bq500215 and bq51025, it seems it is limited to 12V input and 10V output.

 

Would you be able to help answer the following questions:

  1. Can bq500215 EVM be modified to accept 13.5V±0.5V input?

  2. Can bq51025 EVM be modified to give output at 13.5V nominal? Such as modify R6, R7?

  3. What is the recommend inductance for the receiver coil to give 13.5V output?

 

I’m hoping that by using the TI EVMs, we could get a working prototype for our current device. Could you help?

  • 0
    TI__Prodigy 160 points
    Hello,
    1. The bq500215EVM is rated for 12.5V max, but it will still work for 13.5V ± 0.5V without any extra modifications needed.
    2. The maximum output of the bq51025 is 10V. However you can use a boost stage afterwards to get your 13.5V output.
    3. see answer 2
  • 0 in reply to Tobias Puetz (TP)
    Intellectual 460 points
    In addition to the 10W / 13.5V wireless charger, I’m also evaluating options for a single cell Li ion wireless battery charger.

    Ideally, the Transmitter could take 13.5V input. It seems the ideal combination for the Transmitter and Receiver controller is:

    BQ500210 + BQ51050B

    However, I’m not sure if they are compatible to each other or not, as BQ51050B is Qi v1.1 and BQ500210 is Qi v1.02. Also, can BQ500210 take 13.5V input?
    Could you please help confirm if they are OK to work together.

    Alternatively, the combination BQ500212A + BQ51050B can be used, but because BQ500212A can only take 5V input, we can not use our current 13.5V AC adaptor for convenience unless adding an extra step-down converter.
  • 0 in reply to sujeeva wettasinghe
    TI__Prodigy 160 points

    Hello,

    We don't recommend using the bq500210 EVM as it is already relatively old and is also only WPC 1.02 compliant. One of the main changes of WPC 1.1 is the foreign object detection.

    Instead I suggest to take a look at the bq500412 EVM that can be supplied up to 13.5V. This board also has WPC 1.1. Instead of using three coils, you can also just use one coil for evaluation. To see the schematic for single coil use, please take a look at page 6 of the bq500410 EVM . 

    One additional comment on your work with the bq500215 EVM. Capacitor C8 of the EVM is only rated for 16V, so pay attention on your input voltage. You might want to change that one.

  • 0 in reply to Tobias Puetz (TP)
    Intellectual 460 points
    Regarding the EVM bq500412, as it has 3 coils, does it mean it can work with 3 Receivers at the same time? In particular, can it connect to 3 x bq51013EVM-764? If it can, then I’m interested to know if the following are possible:

    1. Supply 13.5V to bq500412EVM and use up to 2A input current to bq500412EVM as it seems allowed in the data sheets
    2. Place 3 x bq51013EVM-764 to the bq500412EVM charging pad, each aligning with one of the three coils
    3. Each bq51013EVM-764 is configured to provide 4.5V / 1A output
    4. Connect each output of bq51013EVM-764 in series to form a 13.5V supplier at 1A
  • 0 in reply to sujeeva wettasinghe
    TI__Prodigy 160 points

    Hello,

    It is not possible to charge three receivers at the same time.

    Furthermore, in your post you say that you are using the bq51013EVM-764. Please note that the bq51013 is obsolete. It has been replaced by bq51013b!

  • 0 in reply to Tobias Puetz (TP)
    Intellectual 855 points

    Dear Tobias


    Well known for the maximum input voltage range of BQ500215EVM! Thanks.

    If so, what is your recomendation current for 12.5V power adapter with consideration of mis-alignment at the 10W load?

    Of course, It wll be depend on several factors to implement 10W wirelless power. I just want to know your comment for TX Power Source because the  more current the expensive.

    Best Regards.

  • 0 in reply to avraka
    TI__Prodigy 160 points

    Hello,

    Sorry, but we don't recommend any specific power adapters. 

  • 0 in reply to Tobias Puetz (TP)
    Intellectual 855 points
    Sorry to let you lead misunderstanding.

    What I want to know is just for recommendation of current requirements, not power adapter supplier...
    In the datasheet 1A is required, However 2A currents are recommended in the EVM documents...

    BR
  • 0 in reply to avraka
    TI__Prodigy 160 points

    Hello,

    sorry for the misunderstanding. 

    As you already said the need for your power supply is dependent on many factors. You can calculate the current your power supply must be able to deliver at least by determining the efficiency of your system and then putting extra margin on top to ensure proper operation.

    As a start I would suggest to use a lab power supply that can deliver high currents. Then, measure the current that is flowing into your system. I would not recommend to buy a power supply with a specific maximum current right away.