power control on wireless charger

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power control on wireless charger

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sanjay645
Contributor I

Hello, I have nxp board having microcontroller mwct2016s based on s32k3 series. Its a wireless charger board and I got sample code of wireless charging from NXP. I have to control the charging power of this wireless charger. I have two questions:

1)I searched the api to see from how much power the wireless receiver is getting charged from "Qi_PC0_WCT_Library_User's_Guide" manual. I found that "WCT_ReturnPrivatePower " function is always giving me zero value as function is empty. "PROT_CheckRunTimeParams " is giving me minimum guranteed value of charging power. And "dwRxReportedPower" variable may be giving me the current charging power of wireless receiver, should I use this last variable to see from how much power, my wireless receiver is getting charged.

 

2) I want to control the power for example if temperature of coil or board reaches to a mamimum value then i want to charge the wireless receiver with some less power so that i can avoid damage to coils or boards, and whenever temperature goes below, i want to charge it with some higher power. I did not get any api in the document "Qi_PC0_WCT_Library_User's_Guide". Please provide me the solution how can i control the charging power. Is ther any api to do so? 

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sanjay645
Contributor I

Hello, @diazmarin09 , I have a very simple question, how can i control power of the wireless transmitter. Is there any api available? I have very simple logic, whenever temperature goes above a value, it should charge with 1Watt power and whenever it goes below that value, it should charge with maximum power. Please provide the api to control power.

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diazmarin09
NXP TechSupport
NXP TechSupport

Hello sanjay645,

Please review the response from our specialist below:

This function will be supported in the upcoming CDD 2.7.2 which we are planning to release at the beginning of the next year. Moreover, I would not recommend to limit power to 1W only as it has many consequences – invalid calibration for EPP Rxs in terms of power losses, some Rxs may sporadically stop the power transfer as they will not get enough power as they are requesting, etc.

I hope this information helps.

Regards,

David

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diazmarin09
NXP TechSupport
NXP TechSupport

Hello sanjay645,

Your patience is greatly appreciated.

Please review the response from our specialist below:

  1. Function “WCT_ReturnPrivatePower()” is dedicated for proprietary protocol support (e.g. Xiamo, Huawei, 40-50W charging, etc.). It is not implemented in the standard NXP reference design, but only prepared for customer usage. Please use the “dwRxReportedPower“ variable as you stated above. It is an actual power received by Rx (phone) which is reported to Tx using Received Power packet (RP). Please note that you need to be in the power transfer state to be able to receive RP packets.
  2. Rx is master of the power transfer control where it only says how much power should be provided by Tx. There are specific circumstances, where Tx can decide to reduce the power, e.g. in order to do not overheat a metal foreign object if Tx identifies potential risk or extra power losses. Currently, the feature you are referring to is not implemented in the CDD 2.7.1 (our latest SW release). This function will be supported in the upcoming CDD 2.7.2 which we are planning to release at the beginning of the next year.

I hope this information helps.

Regards,

David

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diazmarin09
NXP TechSupport
NXP TechSupport

Hello sanjay645,

I hope all is great with you. Thank you for using the NXP communities.

Please accept my apologies for the delayed response. I want you to know that we are reviewing your request internally.

We will do our best to get back to you as soon as possible with a resolution to your issue.

I will appreciate your patience and  your understanding.

Regards,

David

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