vanshajtaxali
Newbie level 6
Hey
I am posting the schematic that i am implementing and also the observation on my oscilloscope and here are some points for better understanding
1) I am using STGW20NC60VD IGBT and the data sheet is attached also the diode I'm using for boot strapping and snubber are FR105 (datasheet attached as well)
2) The signal are the SPWM logic for a damping sinusoidal wave and whenever logic zero comes both low side are switched off to provide additional freewheeling path the bit rate of this PWM is 10khz
3) The value of inductor is not known(the biggest problem!!) but it gives a perfectly good sinusoidal wave at 10khz bit rate, i have attached the observations from my scope in a pdf
4) I am creating a SPWM text data file from c code consisting of 0,1 and-1 and then reading it via raspberry and hence controlling the GPIO .
5)I did not use the gate resistor because the outputs were just fine without them and have checked 100 times that there is no shoot through you can see it in the observation pdf as well...I have used no capacitor in parlell because when i did the current going back increased a lot
I am posting the schematic that i am implementing and also the observation on my oscilloscope and here are some points for better understanding
1) I am using STGW20NC60VD IGBT and the data sheet is attached also the diode I'm using for boot strapping and snubber are FR105 (datasheet attached as well)
2) The signal are the SPWM logic for a damping sinusoidal wave and whenever logic zero comes both low side are switched off to provide additional freewheeling path the bit rate of this PWM is 10khz
3) The value of inductor is not known(the biggest problem!!) but it gives a perfectly good sinusoidal wave at 10khz bit rate, i have attached the observations from my scope in a pdf
4) I am creating a SPWM text data file from c code consisting of 0,1 and-1 and then reading it via raspberry and hence controlling the GPIO .
5)I did not use the gate resistor because the outputs were just fine without them and have checked 100 times that there is no shoot through you can see it in the observation pdf as well...I have used no capacitor in parlell because when i did the current going back increased a lot