I already searched and read the other pages but they doesn't show how to find out Vds (drop across drain and source)
I am really sorry for opening this thread. Thi squestion was related to Pure Sinewave Inverter Design Help thread in Microcontroller section.
Anyway as I have opened this thread I will continue about Mosfet power here only.
My Inverter will be designed for 5 KW and Output voltage will be 230V.
So, P = VI
I = P/V = 5000 / 230 = 21.7 (approx 22A rms)
Ipk = 1.4142 * 22 = approx 31 A
My Rds(on) = <0.18 Ohms
So, Mosfet power dissipation = I^2R = 31 * 31 * 0.18 = 173 Watts ?
Edit, Sorry Rds(on) is 0.14 Ohms
So, PD mosfet = 31 * 31 * 0.14 = 135 watts ?
I am using STE40NK90ZD mosfet.
At 25 degree C it can dissipate 600W according to datasheet. So, can I use this mosfet safely ?
You need to calculate or preferably measure the true rms current through each mosfet at whatever duty cycle is appropriate.
At home I don't have an oscilloscope which can measure more than 60V
Its only possible to make a very rough guess, because many of the factors you need to know to do it properly will not be known to sufficient accuracy.Okada; said:1544458]How to calculate power dissipated in Mosfet ?
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