I am having difficulties in trying to switch the high-side IGBT in the circuit below, that is connected to a capacitor. The input is from a power supply of 50V. When S1 is ON the capacitor charges from 0V to 50V. (There is a reason to why I need the capacitor to charge from 0V - 50V).
I give a switching signal of 3.3V from a micro-controller and 12V from a regulator.
I use V0D3120AD, which to the best of knowledge acts as an opto-coupler. I connected the opto-coupler as shown below to drive the high-side IGBT but it does not work as intended.
I also thought of using a gate driver shown below (where the bottom MOSFET would be a capacitor in my case and grounding LO pin) but the problem is that my bootstrap capacitor needs to be charged from Vcc via a ground path for it to provide the required voltage to switch on the IGBT, and therefore I suppose I cannot use this gate drive circuitry, since the bootstrap capacitor doesn't have a path to ground to charge up and I don't know if it can charge up through the 10mF capacitor.
My other solution is shown below, where I use 12V regulator and the ground of the regulator is connected to the emitter of the IGBT thus always giving 12V from gate to emitter. The 10k resistor is to discharge the parasitic capacitance of the IGBT.
I would appreciate some advice whether my last solution of using just a regulator is a safe way of achieving high side driving or is there some modification I can make to the other circuits.