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Switchings are pwm switchings up to 20KHz. Actually i use a snubber. May be it needs tuning. I need some info to calculate parameters, can you offer something? Also someone proposed me to connect an rc filter to the gate , but i couldn't understand the use of this. Does this method make any sense to you?
Maybe this is a stupid suggestion, depending on your experience level, but have you checked your measuring method? Per example, measuring with a scope with long ground leads will also result in perceived ringing on edges?
If you mean the peak/dip at rising/falling edge of 'switching signal' (PWM signal to gate), then you should add a resistor in series to the gate of the mosfet. If I'm not wrong, larger resistance value will increase the rising time, and therefore reduce the peak magnitude. However, switching loss will increase. So, need to set a balance.
first, you must to ensure that your pulse gate of switcher can truly on and off. The second, Your PS must be in continuous conduction mode. Circuit of snubber maybe complex and difficult, if not work in big power maybe u can select device over your design ( current and voltage capability ).
I have the same problem, but my device is in integrated circuit. and the inductance is the bonding wire. The breakdown voltage is very little. I can't decrease the rise time. And I can't connect anything with parallel to the bonding wire.