Level 1
Level 1

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

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
Moderator
Moderator

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

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
Moderator
Moderator

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

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
Level 3
Level 3

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

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.

Moderator
Moderator

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

Hi @Rakesh_rp ,

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

Thanks,

Krupashankar

Moderator
Moderator

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

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

Level 3
Level 3

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

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

Moderator
Moderator