Wide spikes could not be ignored. I'll have to analyze what testing
uncovers. Let me know if the title of the specification document comes
to mind. Thanks



-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
Of mchipguru@charter.net
Sent: Wednesday, November 16, 2005 10:32 AM
To: Microcontroller discussion list - Public.
Subject: Re: Re: [EE] Semi-Trailer Battery Power Filtering

Not sure why but on a transit bus in Italy every time they pressed and
released the brake pedal they saw surges up to 100+ VDC on the 24VDC
available at the dash. I think there were electrical solenoids involved.
Some of there surges were wide which is why I do not call them spikes.
We used seperate lines from the battery with inductors and polyfuses as
part of the protection on the front end. There is a specification book
available with the types of design parameters you need to consider. I do
not remember the title but did see it when working on this project.
Larry




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