BJT-piloted MOSFET circuit: Feedback requested

Question

I had the idea to make a power converter, and I would like some feedback. I can take constructive criticism.

The basic idea was to make something where a microcontroller could drive a power MOSFET, with some isolation from the gate capacitance in the form of a pilot BJT. There are also manual start and stop buttons, in addition to the microcontroller input.

The BJT is pre-biased to save board space. I've built and tested this, and it works. However, I feel someone better than me could pick it apart, and guide me in the right direction.

I have the Eagle files in a GitHub repository: https://github.com/gregkrsak/kriner-pc

Thank you.

Answer 1

There are hundreds of switch designs on this site. You must define I surge ,, Power dissipation in switch and turn on, off times.

But presently the transistor will needs base current limiting and a base shunt prevent floating when off with stray noise turning it on. Values are not critical. (and I see this part already includes them 4k7,10k)

Also there is no short circuit protection and the Tact Stop switch does not latch.

There may also be a need to prevent Vgs being exceed by ESD damage from a floating output and connecting long charged floating wires.