Power limit calculation in software for 3.4kW onboard EV charger.

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Rakesh_rp
Level 3
Level 3
First solution authored 10 replies posted 10 questions asked

I am using  xmc1300 development board for PFC stage in 3.4kW onboard EV charger. In the software for PI  voltage control loop I have to set the max power limit as 3.4kw. This power limit is also used in duty cycle calculation for MOSFET gate signal. The max dc bus voltage at LLC stage is 64v and the  max current rating is 53A.  How to scale this 3.4kW power limit , so that I can use it in the software calculations. I am using DAVE 4.4.2 VERSION.

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1 Solution
Krupashankar
Moderator
Moderator
Moderator
500 replies posted 50 likes received 25 likes received

Hi @Rakesh_rp ,

You can try changing the P_LIMIT_3000 ( 3050u) to P_LIMIT_3400 ( 3450u) to scale the power limit to 3.4KW 

Please find the image for Q format calculation.

Krupashankar_0-1637144377174.png

 

For Scaling up to 3.4 KW please change the respective current and voltage values within the software. Please ensure ADC configuration to measure current and voltage to scale up to 3.4 KW from 3 KW.

 

Thanks,

Krupashankar

 

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2 Replies
Krupashankar
Moderator
Moderator
Moderator
500 replies posted 50 likes received 25 likes received

Hi @Rakesh_rp ,

 

Could  you please share the exact code for us to look at the details and get back to you?

 

Thanks,

Krupashankar

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Krupashankar
Moderator
Moderator
Moderator
500 replies posted 50 likes received 25 likes received

Hi @Rakesh_rp ,

You can try changing the P_LIMIT_3000 ( 3050u) to P_LIMIT_3400 ( 3450u) to scale the power limit to 3.4KW 

Please find the image for Q format calculation.

Krupashankar_0-1637144377174.png

 

For Scaling up to 3.4 KW please change the respective current and voltage values within the software. Please ensure ADC configuration to measure current and voltage to scale up to 3.4 KW from 3 KW.

 

Thanks,

Krupashankar

 
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