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MPaulHolmes · 10-20-2010, 11:46 PM

Sorry, I was away getting pinewood derby supplies for my 3 year old. "He's" going to enter the competition on Nov. 20th. hahaha.

I'm using 10 stth6002c diodes.

If you use a diode and resistor in series, the mosfet drain voltage will pulse MUCH higher than if you don't have a resistor in series with the diode, assuming paths are already at a minimum length. I also simulated that, but I haven't posted it. With a resistor it was 300v at the mosfet, and without the resistor it was about 140v at the mosfet.

I think your layout is the reason you are observing different results. I think you should have each diode/capacitor/mosfet loop as small as possible, because that loop has the fastest changing current on it. Everything else is a slop fest (meaning the other stuff can be relatively long).

10-20-2010, 11:46 PM	#3883 (permalink)
MPaulHolmes PaulH Join Date: Feb 2008 Location: Maricopa, AZ (sort of. Actually outside of town) Posts: 3,832 Michael's Electric Beetle - '71 Volkswagen Superbeetle 500000 Thanks: 1,368 Thanked 1,202 Times in 765 Posts	Sorry, I was away getting pinewood derby supplies for my 3 year old. "He's" going to enter the competition on Nov. 20th. hahaha. I'm using 10 stth6002c diodes. If you use a diode and resistor in series, the mosfet drain voltage will pulse MUCH higher than if you don't have a resistor in series with the diode, assuming paths are already at a minimum length. I also simulated that, but I haven't posted it. With a resistor it was 300v at the mosfet, and without the resistor it was about 140v at the mosfet. I think your layout is the reason you are observing different results. I think you should have each diode/capacitor/mosfet loop as small as possible, because that loop has the fastest changing current on it. Everything else is a slop fest (meaning the other stuff can be relatively long). __________________ kits and boards Last edited by MPaulHolmes; 10-21-2010 at 09:14 AM..