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New Contributor

Oct 10, 2021
04:45 AM

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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

Solved! Go to Solution.

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- IFX

1 Solution

Moderator

Nov 16, 2021
11:34 PM

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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

Oct 13, 2021
05:04 AM

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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

New Contributor II

Oct 26, 2021
12:31 AM

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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

Nov 16, 2021
04:19 AM

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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

Nov 16, 2021
11:34 PM

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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

New Contributor II

Nov 17, 2021
09:28 PM

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Thank you for replying,

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

Moderator

Nov 23, 2021
12:59 AM

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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