Part Number: BQ51050B
I've been using the BQ51050b RX in a design for several months now, and I'm just not getting the range that I need. To get any boards to work, I have had to take apart our transmitter so that the RX coil is actually touching the TX coil in order to get power transfer to begin, and a fraction of the boards fabricated never even get above the UVLO to start charging. I know WPC 1.1 only supports up to 7 mm, but we're not even getting close to that. If I need more range, should I move toward the WPC 1.2 technology?
Bill Johns, Applications Engineer
Texas Instruments Inc
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In reply to Bill Johns:
1.) Rx is Wurth 760308101214 (26 uH) 2.) C series = 22 nF, C parallel = 100 pF 3.) I don't know the details of the TX coil, it is an off-the-shelf Samsung pad similar to this: www.samsung.com/.../ Thank you for your help, Brad
In reply to Brad Nelson99:
I tried Cs = 100nF on two different boards (while leaving Cd at 100 pF) : one that works when the coils are basically in contact, and one that never gets above UVLO. It had no significant effect on either board. We are using a coil this small because the final device needs to be as small as possible, and the coil is currently one of two major size limitations. Is it possible that the range cannot be increased when using such a small coil?
Can you post a scope capture of voltage at RECT pin during a no-start condition.
This is the schematic without the changes from this thread. The current board I am testing has the following changes:
C10 = 100 nF
C3, C4 = 68 nF
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