On 1/20/2013 4:10 PM, Danpatgal wrote:
Thanks Lee ... so how does one evaluate the gate driver circuit, and if it is
bad, replace it?
I feel like I'm peeling back the layers of the onion ... and if I ultimately
can't do it, I'd have been better off having someone else repair it or
getting a new one.
The control board is the small one with all the parts on it. You can
power it separately with a small bench supply, and watch its gate output
to be sure is is switching high/low properly.
The big power board just has series resistors going from the gate driver
to each of the MOSFETs. When a MOSFET dies, it can fail with a short
from gate to drain. That puts pack voltage on the gate driver!
With luck, the gate driver resistor explodes like a fuse, and 'saves'
the control board. But sometimes, the gate driver resistors don't open
until too late to save the gate driver circuit on the control board.
--
A designer knows he has achieved perfection not when there is
nothing left to add, but when there is nothing left to take away.
-- Antoine de Saint Exupery
--
Lee A. Hart, http://www.sunrise-ev.com/LeesEVs.htm
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