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| Ev Archive for August 2001 |
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| 1292 messages, last added Fri Aug 31 23:58:17 2001 |
[Date Index][Thread Index]
Re: Rudman Was Right! (was Dualin'7s Smoked Controllers)
> Perhaps, but since it is the bypass contactor that is failing
> the discussion was focused on how to protect it from being hammered.
>
> At the instant that the contactor closes, if the MOSFETs are
> conducting then the contactor sees a much smaller inrush current
> than it would otherwise. If the MOSFETs are again conducting
> when the bypass contactor opens, then it breaks a much smaller
> current than it would otherwise since the current will have
> divided between the resistance of the parallel MOSFETs and
> resistance of the contactor.
>
Except contactors don't close instantaneously. If the controller isn't in
full on mode (100%) then, assuming a 15khz switching rate, the FET is only
on for less than 0.000066 seconds each time.
I'm pretty sure the contactors takes longer than that to close.
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