Protection for Elelctronic equipment in cars.

[Joe.G]

Hi All,

To run micro's and other electronic equipment in cars -
What protection would you suggest.

Where can I find information on how to protect sensitive
electronic equipment from surges and spikes etc.

Eg Transient Voltage surpressors etc


Thanks in advance.

Joseph

 

[John - KD5YI]

Joe.G wrote:

Hi All,

To run micro's and other electronic equipment in cars -
What protection would you suggest.

Where can I find information on how to protect sensitive
electronic equipment from surges and spikes etc.

Eg Transient Voltage surpressors etc


Thanks in advance.

Joseph

Here is a start:

http://www.powerdesigners.com/InfoWeb/design_center/Appnotes_Archive/AN9312.pdf

John

 

[Ken Smith]

In article <42401db7$0$22221$afc38c87@news.optusnet.com.au>,
Joe.G <joe.gXSPAMX@optusnet.com.au> wrote:

Hi All,

To run micro's and other electronic equipment in cars -
What protection would you suggest.

Where can I find information on how to protect sensitive
electronic equipment from surges and spikes etc.

Eg Transient Voltage surpressors etc

Teccor has a few app-notes on the subject of protection. I like the
Sidactor devices they make as a way to clamp spikes. Just remember that
in a car, you have a car battery that can give you nearly infinite current
so you must always make the protection limit the current.

In general PTC overcurrent devices such as Bourns and Tyco/Raychem sell,
work well to protect things like motors against long term overloads. They
open the circuit long after any semiconductors they may be protecting are
smoked. They are none the less useful when combined with a clamping and
other current limiting method. They can prevent the protection circuit
from overheating.

Another method is to design your circuit using truely huge semiconductors
so that it will happily continue working with 60V applied. Reverse
protection diodes on the power connections are needed too.

Murata has some devices called "posistors". They are much too whimpy to
protect your power connections but could be useful as part of an I/O line
protection.



--
--
kensmith@rahul.net forging knowledge