wireless charging bq51050 reception

am using a SAMSUNG wireless charger (Model: EP: PG9201) Transmitter for my project, and at the receiver end I have RX coil of 26uH inductance and 520 mOhm DC Resistance, when i place the reciver assembly on top of the transmitter the coil is picking up volta ge and pinging is taking place but it seems like the transmitter is not detecting the device.Based on the calculations in page 29 of the BQ51050 manual the C1 and C2 was determined and as 30 nF and 1nF and when the receiver configuration was placed on the Qi Samsung wireless charger it did not seem to work as intended so started to analyze the circuit i tried to change the C10 & C14, COMM1 & COMM2 cap to 47nf yet did not get any results

After hooking up the scope across C7 cap I get this in my scope and the frequency out of dual resonant circuit across the Cd (C7 cap) to be 37 kHz where it was suppose to be 1MHz and in the scope (fig 1)in the image i presume the long pulse to be the pinging form the transmitter but the short pulse is it the response packet from the BQ ?

In figure 2 seems to continue but the charging does not start.In fig 3 is a more closer view of the wave form. with a voltage of 1.8 V peak. and in fig 3 is when the system without the battery connected
I would like to know what this wave forms are and is there any way for me to analyse what is going on with the BQ15050B or is there any shortcoming in my design, if possible please send me a reference of how the communication wave form looks like between the transmitter and the receiver.

archusvijay1 said:

37 kHz where it was suppose to be 1MHz

Click to expand...

A simulator confirms 1 MHz is the correct resonant freq. If you believe this is holding back your progress, then you ought to test the LCC loop by itself isolated from other circuitry. It should reveal whether a component is the wrong value. If you find that it really does resonate at 1 MHz, then reconnect it. There is a chance the other circuitry inhibits it from proper operation.

Its terminals are labelled AC1 & AC2. The schematic has more than one location labelled AC1 & AC2. Can you confirm that you have it connected at the proper location?

[Edited to add: I magnify the image so now I see C9 & C11 are .47uF, so ignore this question about "C9 & C11 are 47uF", which seems a large value compared to neighboring capacitors. Neighboring values are in a range which seems better related to 1 MHz.]

C9 & C11 go to pins labelled with the word 'clamp'. Does your circuit have anything to do with a diode-clamped waveform? Your image #1 looks like the kind associated with a diode-clamped inverter (block-y sinewave, 3 or 4 level). I don't know whether or not this is important in your project.