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Re: [TCML] Driving a flyback off of mains gate drive woes.
Scott,
Below is a link to a full schematic for a flyback driver off the
Information Unlimited website. No personal experience to know how well
it works, but it seems to be a close match to the sort of thing you are
looking for.
http://www.amazing1.com/download/PVM500BASICSCHEMATIC.pdf
Dave
On 10/6/2011 6:40 PM, Scott Bogard wrote:
Greetings all,
Back up to my old tricks again. After procuring a schematic for
a PVM 400 flyback driver, and noticing it runs off of mains voltages,
I am attempting to create my own version, with programmable adjustable
duty cycle and frequency. What I don't seem to know how to do, is
drive the gates, what I have is an ATmega chip producing a nice 5 volt
square wave, of variable duty cycle and frequency (3-300 kHz) and some
good flybacks. Obviously I cannot just plug that 5 volt signal into a
bunch of MOSFET gates, it would likely not have the guts to hold them
open, even if it was the correct ground, which it is not. So
basically what hardware is needed, a gate drive transformer? MOSFET
driver? Could somebody please point me to some straightforward
literature about biasing MOSFETS, and possibly provide part numbers,
not just reference "generic BJT." I know it must be possible, people
have run solid state TCs off of MOSFETs for a long time, so what am I
missing... Thanks in advance, I'm looking specifically to run it off
of about 320V DC (+-160V) low side drive (not half or full bridge) if
that makes a difference.
Scott Bogard.
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