![]() ![]() Iam working on this problem more than two months and lost many mosfets. I have a problem on the high side pulses when I use mosfet driver. The low side should always work independent from the charge of the bootstrap capacitor. Please do give me a helping hand, so that i can fix the problem.īut you have to remember that the bootstrap capacitor only gets charged when you open the low side of the half bridge. I am getting both low side and high side pulses from the Ic, but when connected to the Mosfet bridge I am not getting any output. Right now I am implementing a 3-phase inverter for driving the motor. The one connected to 12V is switching off when the high side is on and the one connected to GND switches off when the low side is on. The problem you get then is that when the current on VS gets higher then 12V you get a problem. The equation for calculating that value is described on page 6 of the International Rectifier application note AN-978. So after turning on the power the capacitor is not charged and you have to turn the low side MOSFET on first, then turn it off again and finally switch the high side on. Still you have to be careful because the capacitor only gets charged when the low side MOSFET is turned on. ![]() I took a 330uF capacitor and it is enough to turn the high side MOSFET on for about 30 seconds. It is providing the charge for the gate of the high side MOSFET when you turn it on. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |