Ah; thanks; My electronic thinking is a bit slow and/or rusty. After all it's been almost 30 years since I was studying it, and that was entirely radio circuits, haven't done much since, other than put together a few variable pulsewidth motor control circuits.
OK so it really needs an active gate discharge to take the gate down to 0 with the source, (or emitter in the case of the IGBT) and keep it there. I have a bunch of 2N3906 that should work, although a bit lower current capacity than the 2N2907.
The actual circuit function I need right now is fairly fast turn off, but delay in turn on. Since the control signal is turning on the same instant the capacitor is discharged, and I need the IGBT turning on after it's finished discharging. (The next version will be hall IC switched and have the delay built into the timing circuit) So I'm thinking of putting a resister on the NPN, either collector or emitter side, a small capacitor grounded to IGBT emmiter, and then a small resistor to prevent overloading the PNP in discharge. But that will cause a gradual rise in voltage on the IGBT gate as the capacitor charges. (May not be good for the IGBT) A zener would prevent the gate from getting charge V until it exceeds zener threshold, giving some delay and faster rise time. I put 10V zener on the diagram but 12 might be better with a 14V supply, since the HGTP10N120BN IGBT needs in excess of 12 V to fully turn on.
The main film capacitor will be changeable until I find out how much is needed, I have several 20, 40, and 60 uF motor run capacitors to work with.
The purpose is to develop a circuit that will duplicate the function of a manufactured unit called "blue phoenix ignition" but to be a lot hotter than it, since we've tried the blue phoenix and it's not hot enough to do what we want, (what is supposed to be possible) and the size of it tells me they aren't using a vary big capacitor.