RE: Rudman Was Right! (was Dualin'7s Smoked Controllers)

["Roger Stockton" <rstockton@delta-q.com>]

Absolutely.

As I said originally, this technique is used successfully by the
GE EV-1 SCR controllers that switch at 50-300Hz, but it could be
challenging to apply to a high frequency MOSFET controller...
unless the controller manufacturer was motivated to develop
software that provided a bypass contactor control and mode that
reduced the switching rate or otherwise guaranteed that the
switches would be on for the full 20-30ms contact open/close
interval...

Cheers,

Roger.

-----Original Message-----
From: owner-ev@listproc.sjsu.edu [mailto:owner-ev@listproc.sjsu.edu] On
Behalf Of Peter VanDerWal
Sent: August 31, 2001 7:09 AM
To: ev@listproc.sjsu.edu
Subject: Re: Rudman Was Right! (was Dualin'7s Smoked Controllers)

[snip]

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.