My apologies if this is inappropriate question to ask on this forum. I'm struggling in coming up with a solution and thought some super-smart level 6 engineers on TI forums could help me.
I have a feeling that there is a simple solution to this that I'm too inexperienced to see.
Here is my schematic:
The goal of the pulse circuit is to generate a 100ns pulse at 220V. I realized that the above schematic was wrong, as the gate driver's 12V output would merely be putting the power mosfet into reverse recovery and not closing/opening the switch.
I then tried the following topology as a solution
Notice that the power mosfet was simply placed below the transducer. This way, Vgs would be between the ground node at the bottom of the circuit and the gate. The previous topology meant that I would need to give the gate a 230V to activate it.
All seems well, but unfortunately I do not think this topology will work either. The PT-12 is a piezoelectric transducer, and from my understanding, they operate a lot like trampolines. You want to lift up the trampoline with high voltage, and then let it go so it can bounce up and down. For a piezoelectric transducer, this would then settle into the RF and generate an ultrasonic pulse. The problem I see here, is that even if I shut off the gate, the PT-12 would still be being 'lifted up' by the 220V node. So even if I switch the mosfet on and off and the correct frequency, all that would be doing is create a current square wave (is that a real thing?) all at the same voltage, never releasing the transducer to actually do any resonating.
What is the secret to getting this to work???
