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## Power limit calculation in Software for 3.4kW onboard EV charger

Level 1
Level 1
In PFC stage of EV charger. How to calculate the maximum PI output value for pi voltage controller if the required power limit is 3.4kW. This value is used in duty cycle calculation for mosfet gate signal
1 Solution

## Re: Power limit calculation in Software for 3.4kW onboard EV charger

Moderator
Moderator

Hi @User22872 ,

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.

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

6 Replies

## Re: Power limit calculation in Software for 3.4kW onboard EV charger

Moderator
Moderator
Hi Rakesh,

Could you please tell us What is battery bus voltage and maximum current rating?
and please share the details of MCU and power board and SDK version.

Thanks,
Krupashankar

## Re: Power limit calculation in Software for 3.4kW onboard EV charger

Level 3
Level 3

hi krupashankar,

This is rakesh . replying you from a new myinfineon account.

I am using  xmc1300 (xmc1302 -T038x0200 )development board for PFC stage in 3.4kW onboard EV charger. 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.

## Re: Power limit calculation in Software for 3.4kW onboard EV charger

Moderator
Moderator

Hi @Rakesh_rp ,

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

Thanks,

Krupashankar

## Re: Power limit calculation in Software for 3.4kW onboard EV charger

Moderator
Moderator

Hi @User22872 ,

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.

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

## Re: Power limit calculation in Software for 3.4kW onboard EV charger

Level 3
Level 3

Could you please mention which formula you have used to calculate  P_LIMIT_3400  value as  (3450u)

## Re: Power limit calculation in Software for 3.4kW onboard EV charger

Moderator
Moderator

Hi @Rakesh_rp ,

From the code snippet you have shared we could see for power limit of 3KW a value of 3000 is used , for 3.4 KW the max value is calculated as 3400 It turns to be a maximum value with a cross product of current and voltage which is scaled to Q format. Could you please share the code which will help us in determining the calculation.

If it is an example code please share the version

Thanks,

Krupashankar