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1 Solution

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.

 

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4 Replies
Santhoshkumar
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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.

Santhoshkumar_1-1709634683189.png

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

Best regards,
Santhosh Kumar

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Thank you @Santhoshkumar for replying,

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!

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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.

 

Thanks @Santhoshkumar  for ur support, i understand now.

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