BQ500211A CE compliance

Hello Ignasi!

Thank your for your anwser.

For a few months we are in contact with Notify Body from our country. They are very experienced with R&TTE, but QI standard is something completely new for them. A few weeks ago, I asked the CETECOM about their experience with QI standard and they didn't answer me yet.

QI is very bad for radio tests. This is because the frequency is not constant and can move around 112-205kHz. We have to test devices in extreme conditions (in terms of frequency), but we are not able to force it in BQ500211. This chip doesn't provide any kind of test mode. At the moment we are testing charger by leaving charging on for few hours with Max Peak radio detector. But this kind of test protocol doesn't give repeatable results. Another problem is EN 300 330 requires measuring with QP detector (6.6 in document). We did the tests with Max Peak detector, because with QP spectrum looks "strange". 

I am concerned about the ongoing certification process. Texas Instruments reply on my support question, that I should contact one of distributors - maybe this company doesn't have any engineers to support their customers?

Ignasi - this is my email r.nowosielski[at]heartmedicaldevices.com. I would be very grateful for any information about CE compliance of QI chargers. Let's stay in touch.

Hi radoslaw,

Really interested to know how you got on with this in the end.

We have a device going through RF testing EN 300 330 and FCC. The device incorporates a Qi charger using BQ51051B on the receive side and IDT solution for TX. 

We have passed EMI testing already, but the RF testing is failing due to the Qi charger. I am at a real loss where to go from here. Clearly there are many Qi chargers on the market and I am wondering how they all got through when clearly the Qi format falls foul of RF tests.

Any update you can provide would be really helpful.

We have to do RF testing as we are using the CC2541 Bluetooth device. 

Regards

Rob

Dear Rob,

I have also similar question.

In addition I would like to receive any help on letting me know how with Qi devices, you may comply with EN300 330, when it says that for frequencies above 148.5kHz you must be under -5 dBuA/M??

Regards

Ignasi

Hi Ignasi,

We are still working on this at the moment. It is a real headache. There are also version of Qi which perform different direction communication which can also complicate test classification. 

(My understanding so far)

For example the charger dock doesn't communication to the receiver in the older version of Qi instead the Receiver part in my case the BQ51051b is the 'radio' transmitter the its effectively sends charge power information back. 

From what we are seeing at the moment, it the power chirp - used to wake up a receiver device which may be the biggest cause. I'll keep this updated as we make progress. We are using a non TI transmitter with the TI receiver. The company who produce the transmitter solution are being very supportive and pro-active for us, I'd like to see a lot more from Texas Instruments on this subject.

Should you by any chance be using BQ51051, we have recently discovered that the data sheet doesn't mention a resistor needed to help tune the profile. In fact is hidden away in some obscure tuning guide.

Please anyone who been through this process of RF testing with Qi chargers / receivers contribution on this thread would be really helpful.

Rob --

Sorry to bump a ghost thread, but would you be willing to share the doc ID of that 'obscure tuning guide' / what the extra resistor entails?