Announcements

# EVAL-M1-IM323 output current per leg value

## EVAL-M1-IM323 output current per leg value

Level 1
Level 1

Hello, I can't imagine how the value of output current per leg in parameters calculated, so i need a help for knowing that.

Attached a screenshot from parameter table.

Thanks!

1 Solution

## Re: EVAL-M1-IM323 output current per leg value

Moderator
Moderator

Dear @Ahmed_Kamal22 ,

Output current per leg is output phase current only and you can find in page no. 34.
(Channel 3 output is the phase current).

Here, output voltage is from the inverter.
It will be dependent on factors such as Modulation Index (MI), and degree of operation etc.
and the output voltage is modified according to MI.

Power = 1.732 * line voltage * line current * Pf.
For instance,
Power = 1400 W
M.I = 0.69
Dc bus voltage = 208
Output voltage = 143.54 V
Output current = 1400/(1.732 * line voltage * Pf) = 7.788 A.

I hope this helps,

Best regards,
Santhosh Kumar.

4 Replies

## Re: EVAL-M1-IM323 output current per leg value

Moderator
Moderator

Dear @Ahmed_Kamal22 ,
Greetings from Infineon Technologies,
Thanks for posting your query in Infineon Community.

Generally, the output current per leg means the output Phase current.
In page no. 34, you can find the output current (7.788 A) waveform for input voltage of 165V.

Please check and kindly let us know if you have any further queries.

Best regards,
Santhosh Kumar

## Re: EVAL-M1-IM323 output current per leg value

Level 1
Level 1

I had seen this table before, but i mean what is the equations used to get this value.

I tried to get current as shown:

I_ph = P_out/(3*(V_DC/sqrt(2))*p.f.) = 1400 / (3*(208/sqrt(2))*0.723) = 4.389 A not 7.788 A as mentioned in first row of the table which i think it are practical data not calculated.

So the question now, why the result of mathematics don't match practical results or my equation is wrong?

Thanks a lot!

## Re: EVAL-M1-IM323 output current per leg value

Moderator
Moderator

Dear @Ahmed_Kamal22 ,

Output current per leg is output phase current only and you can find in page no. 34.
(Channel 3 output is the phase current).

Here, output voltage is from the inverter.
It will be dependent on factors such as Modulation Index (MI), and degree of operation etc.
and the output voltage is modified according to MI.

Power = 1.732 * line voltage * line current * Pf.
For instance,
Power = 1400 W
M.I = 0.69
Dc bus voltage = 208
Output voltage = 143.54 V
Output current = 1400/(1.732 * line voltage * Pf) = 7.788 A.

I hope this helps,

Best regards,
Santhosh Kumar.

## Re: EVAL-M1-IM323 output current per leg value

Level 1
Level 1

Thanks @Santhoshkumar  for ur support, i understand now.