I am using a pushbutton switch to trigger a kelly controller to turn on. The kelly controller is running off 23s and has a wire meant for plugging into a switch/ latching etc. I added some fans powered by a 100vdc - 8vdc buck, and now the switch is blowing randomly.
Switch is rated for 5amps but i suspect the sudden inrush of the caps charging on the buck convertor is arcing the pushbutton switch.
Do i just add a P-Channel Mosfet and call it a day? Anyone want to make some beer money and walk me through this? Help me build a small circuit and order some parts from digikey?
its the damn Buck convertor… I don’t have room to add a second latching switch. Want one switch to power/ arm the kelly, and also activate / turn on the buck which in turn turns on the 8vdc fans to cool the controllers and pack
this is all short term, Long term i’ll have a multi voltage/ dual buck, and thermistors, PWM fan control , and some other fun stuff. Right now its just basic.
I could use a 100vdc relay, but they are huge with coil ratings for 100vdc. I could use a standard bosch 72 volt coil/ contact relay, and over volt it, but I would rather something solid state
Just so I understand what is going on, you are powering the esc logic with 100VDc and the buck converter through the switch? Im not familiar with kelly controller, is the provided voltage from the switch only used to wakeup the esc or is it something more?
Just to give some thinking
What capacitors are on the buck?
Best approach for something like this woul be to have so kind of soft turn on circuit that is controlled by the switch, that means no high current through the switch and mitigation of the inrush for the buck. Depend on the current draw of the buck but if you feed me the info I can cook up something for you to try. Free of charge because thats what the community is about , helping each other out
Yes that’s all it does.
The Kelly is always live and ready to go when it sees 20-100 volts positive.
It’s a really easy setup. No room for primary and secondary switching.
Might use a 72 volt coil relay automotive style Bosch blade relay. Just trying to go solid state.
We ordered this once,. They sent a regular antispark,. Ordered again rush DHL, they still sent an antispark that can’t handle 100v. I don’t trust them anymore
, helping each other out 
