I am currently working on a prototype that is going to generate a burst of pulse of high voltages (e.g. 1KV). To do this, I first made a voltage multiplier and feed the mains voltage (230Vrms) directly into it after isolation was done with a transformer (1:1).
I then need to feed this voltage into another cct (discharg the voltage multiplier) in a timely manner. to be exact, a burst of pulses (5ns ON / 10us PERIOD) needs to be generated at the end.It also needs to generate signle pulses at instances as well so PWM is not the only functionality. the following circuit does this:
As you can see, the switch I used was just a spice model. I am planning to design this switch with mosfets as their recovery time is suitable for this application (being on only for 5ns). I have made the circuit below:
I am having some issues as:
- A p channel is preferable (M1) how ever the max Vds they can sustain is way lower than what I want (1000 V). can a N-channel MOSFET be used? would the voltage drop across just be too much to bare?
- would it better to replace Q1 (NPN BJT) with a N channel mosfet? I don't know if a BJT can coupe with high frequency switching (turning on and going off in 5ns) with an inrush current but I know N channel mosfet does, however the addition of the resistors are going to slow it down so I don't know what to do here!
any help would be greatly appreciated.