how to recalculate the resonant capacitors?

eric_w

Other Parts Discussed in Thread: BQ500211

Dear all:

how to recalculate the resonant capacitors?because i think my coil doesn't match well with bq500211 .As Vladimir Muratov said that i can recalculate the resonant capacitors.But i can't find any document about that.Pls give me a hand.Thanks.

with wrong coil that doesn't match well with bq500211

with right coil that match well with bq500211.

eric

over 12 years ago

0 eric_w over 12 years ago

Intellectual 280 points

i know bq500211 pdf has talk about that in page 11.Is that all?

0 Bill Johns over 12 years ago in reply to eric_w

TI__Guru* 75656 points

Yes page 11 of the bq500211 data sheet has some very good information regarding the Resonant Tank Capacitors.

The resonant tank formed by the coil inductance and capacitors need to have a resonant freq of 100kHz. WPC systems will operate from 110kHz to 205kHz.

1220.LC tank.pdf

But the transmitter coil design is specified in the WPC standard and re-designing the coil can present problems for Qi certification.

0 eric_w over 12 years ago in reply to Bill Johns

Intellectual 280 points

Yes!That is what i need.Thank you for your support.

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how to recalculate the resonant capacitors?