Electronics > Beginners
N-channel Mosfets in a charge pump, replacing diodes
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TheBaconWizard:
Oh almost forgot..  assuming the whole thing is driven properly (I like the look of that driver IC) is my implimentation of mosfets instead of diodes practical?

I saw this:
https://upload.wikimedia.org/wikipedia/en/thumb/6/64/Dickson_MOSFET_doubler.svg/1280px-Dickson_MOSFET_doubler.svg.png

And figured the best way to make it actually work would be with zeners as per my original circuit.,
exe:
I'd say zener is connected incorrectly. It should be connected between source and gate, imho.
TheBaconWizard:

--- Quote from: exe on June 22, 2018, 02:00:38 pm ---I'd say zener is connected incorrectly. It should be connected between source and gate, imho.

--- End quote ---

What would the advantage be of doing it that way rather than as a zener voltage-regulator?
exe:
It would clip gate voltage to zener voltage. With current arrangement, if Vcc is too high, gate will be blown. Although, may be I don't understand the circuit.

On the other hand, gate resistors (needed to limit zener current) would limit switching speed.
TheBaconWizard:
Ah, no, the present arrangement clips the supply to the Zener voltage even if Vcc varies (within reason) because anything over that value is shunted by the Zener, with the resistor bearing the brunt of the current (protects the Zener)

However, switching speed is of concern, and i’m certain I can find diodes that will easily handle the current without any issues, so perhaps your way is better, which would give a voltage of Vcc - Zener voltage
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