DC step up converter

No. For Bosch (Bühlertal) I did a 3-phase EC motor controller... the motor for the interior fan in Mercedes A/C.

...Jim Thompson

This is a cascode circuit with a mechanical switch instead of the semiconductor most everyone associates with a cascode circuit.

Or if you're trying to do it on a six volt vehicle. I tried a logic-level igbt that works like gangbusters on twelve volt systems, but on a six volt bike it gave very poor results. To me this indicates gate voltage isn't the only issue, because six volts is plenty for that igbt. It would be an issue with high voltage power mosfets that require higher gate voltage, that's true, but even if that wasn't the case, there's another little problem: the typical high voltage mosfet has at least a couple hundred milliohms Rds, which at several amps drain current will knock out a big chunk of that measly six volts you started with. For information purposes, I've only used the cascode ignition with bipolars. I've always controlled igbt's and mosfets by switching the gates, with the signal from the points inverted by a small npn transistor. I really like the mosfet cascode idea though. I think I'll snag the heatsink with four IRFP460's for $3.50 at electronics goldmine...