On 1/21/2013 6:13 AM, Danpatgal wrote:
I'm just wondering logically, since my controller didn't completely die, the
MOSFETs popped and I was then able to drive back home (albeit rather
conservatively), isn't that confirmation that the gate driver circuit and
resistor are ok? I mean, wouldn't that have totally stranded me if it also
shorted?
Right you are! There is only one gate driver, but it has many individual
resistors and zener protection diodes to drive the many MOSFET gates.
The MOSFETs probably shorted, and tried to carry the full motor current,
and exploded and burned! But luckily, the explosion cleared the short,
and the gate resistor for that MOSFET probably blew open soon enough to
protect the gate driver. You were then able to drive home on the
remaining MOSFETs.
The controller is now like a frayed rope, with some of the strands
broken. Usable, but it's not safe to put full rated load on it.
--
We live in a Newtonian world of Einsteinian physics ruled by
Frankenstein logic. -- David Russell
--
Lee A. Hart, http://www.sunrise-ev.com/LeesEVs.htm
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