modified 6 years ago

MOSFET Gate Capacitance effects

01:11:22

change the 1kΩ resistor value to 100Ω, 10Ω, etc and watch the gate signals square up, subsequently output power of the converter increases.

consider a complementary pair of medium power mosfets driving a power mosfet gate.  the gate signal source needs to be a horrendously low impedance to overcome all of the input and output capacitance.

published 11 years ago

ETJAKEOC

11 years ago

Maybe my friend here could help explain how capacitance slows signals for newbies? ;) (If you really think I need you to say it for me I'm disappointed in you xD)

faceblast

11 years ago

still trying to figure it out myself

ETJAKEOC

11 years ago

Wait what xD Well I look at it rewlly simply like what happens when you have a resistance from a square wave to a capacitor, saw wave, so especially with a higher pulse signal the resistor acts almost like a didoe and the gate a capacitor it'll "store" some charge from that signal, thus not true switching that'll match our signal

ETJAKEOC

11 years ago

But that's my view on it, I'm pretty good at my handful of things I know, but new things hurt my brain and I still haven't completely gotten over the flu (still trying to heave up my lungs) so my learning curve is slowing as of this week a bit, but I need to get this bug over with so I can slingshot myself around this blackhole and head back to Earth, I heard they've got the answer to this one somewhere

ETJAKEOC

11 years ago

I like this circuit when you remove all the capacitors from the FETs haha :)

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