Wireless power charger with bq2004h

Florian P

Other Parts Discussed in Thread: BQ2004H, BQ51013

I want to realize a wireless power charger.
To control the charging I use the BQ2004H.
To receive the wireless power current, I use the eval kit BQ51013AEVM-765.
My problem:
When I start the charging process and the BQ2004H starts the fast charging with the “Hold-off”, the connection get lost between RX and TX and the charging process starts again and again.

over 11 years ago

0 Bill Johns over 11 years ago

TI__Guru 69186 points

It is possible the bq2004H is overloading the bq51013 at start up.

Try reducing the charger current the bq2004H supplies to the battery.

Try additional filtering on the bq51013 output, more bulk capacitance.

Also the bq51013 output current can be increased a small amount. This is set by the ILIM resistor on Pin G1, resistor R2 on the EVM. See data sheet for more info.

0 Florian P over 11 years ago in reply to Bill Johns

Thanks for your answer.

I think the bq51013 supply the current. The maximum current is 650 mA.

The bq2004H works in switch-mode.

0 Bill Johns over 11 years ago in reply to Florian P

TI__Guru 69186 points

Is the unit working or do you still need help with this?

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Wireless power charger with bq2004h