On 2/26/2013 3:13 PM, Jeffrey Jenkins wrote:
Cor van de Water wrote
FYI,
My GE EV100 controller has 3 large (3" dia) Electrolytic
capacitors bolted to a bus bar above the IGBT.
Lower voltage models often have only 2 caps,
but due to the higher voltage (150V caps IIRC)
the capacitance of each is lower so they mounted one more.
The lower voltage model have 2 caps of 16,000uF 60V (90V surge)
so I would not say that they go without any significant amount
of input caps. On the contrary!
Ok, my mistake. It's been a long time since I looked at the EV1 and EV100,
and, to be honest, I'm not too interested in what GE was doing 30+ years
ago... :D
The GE EV-1 is an SCR controller. It has no input capacitance, but SCRs
do have the advantage that if you exceed their breakdown voltage they
simply turn on. The SCR itself won't be harmed by an overvoltage
transient when a fuse or contactor opens, though other circuitry might be.
The GE EV-100 is an IGBT controller. As Cor mentioned, it does have
input capacitors.
--
Anyone can make the simple complicated. Creativity is making the
complicated simple. -- Charles Mingus
--
Lee A. Hart, http://www.sunrise-ev.com/LeesEVs.htm
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