Im wanting to make a dc to dc buck converter for a solar panel array. Sparkfun has a couple 60 v 30 amp p and n channel mosfets. Which would allow my to wire 3 solar panels on in series. Problem is, i was really hopeing to be able to wire my solar panels in a 4 panel series which would require an 80 volt p and n channel mosfet preferably logic level and i cant seem to find one.
Does anybody know of an 80v logic level p channel mosfet?
There are several 80 volt mosfets to be had but getting the gate voltage up to 80 volts is an issue in a complementary pair. For those that dont understand complementary pair. Im wanting the gates of both the p channel and n channel to be connected to the same pwm output.
If there is no such thing as a 80 v logic level p channel fet. How much of a logistical nightmare am i looking at to get an 80 v p channel gate up to 80 volts without destroying the gate of a n channel.
I just woke up and my brain feels kinda fried from thinking to much last night so pardon if i confused n channel with p channel.
Why would one use p-channel MOSFETs for this? Do you understand the tradeoffs and design
principles of power electronics? I suspect not and you are guessing. High voltage power conversion
is not a beginners project, you will at best blow up lots of MOSFETs, at worst give yourself a life-threatening
DC shock (80V is well into the heart-stopping dangerous range).
The basis of all power conversion circuitry are switches/inductors/capacitors, the control logic and the
protection circuitry. At 80V the protection circuitry is all important and you have to worry about dV/dt
issues in the switches, stray capacitance, shoot-through, inductor saturation and such like. If you get
things wrong you blow up your circuit. The energy stored in the DC bus capacitor at 80V is enough to
do damage in microseconds when things go wrong.
If you want to build your own design you have to take this on, be prepared for failure, and take care
not to electrocute yourself. I would recommend starting at 12V, gradually build up to higher voltages,
higher powers, and you will need an oscilloscope to check on the switching waveforms.