RE: [mugwa] Mosfets and relays and nasty spikes what reset your micro
The problem with high voltage spikes is
that they can travel along active wires and also ground wires. Using a ferrite bead
can work.
However using a Solid state relay achieves
2 main objectives. One, being opto-coupled it completely isolates the control
and power wiring.
Two, If a zero crossing version is
suitable it may eliminate the cause of the spikes in the first place.
A combination of the two methods works
even better.
Ron…
From:
mugwa@yahoogroups.com [mailto:mugwa@yahoogroups.com] On Behalf Of Chris Holme Sent: Friday, 7 April 2006 8:23 AM To: mugwa@yahoogroups.com Subject: [mugwa] Mosfets and
relays and nasty spikes what reset your micro
Hello People I don't know if anybody remembers but a year or
two ago I had problems with turning relays on and off resulting in micro
resets. I was using a mtp30055vl to switch the relay with an extra diode
complimenting the inherent one but still getting resets. Dave came
up with a theory about gate avalanching and spikes and stuff and
suggested a transorb as that had fixed his problem with the bore pump. Andrew S
suggested that I might use a resistor pair so that it took real
current to turn on the mosfet. And Ron suggested using solid state relays
instead. I have tried all of these methods and combinations of them as
well, they all work.
It just occurred to me (which is why I'm firing
off this message) that maybe a ferrite bead on the wire back to the micro
board would also have worked. What do you fellers think?
... I might be tempted to. I have an old C64 SID (sound chip) hooked up to an AT90S8535 with LCD and rotary encoder. Its ugly, but its working. :) adrian...
Adrian Chadd
adrian@...
Mar 19, 2006 1:39 pm
Sounds fun, I'm experimenting with gps programming at the moment, part of my new research job. Regards Chris Holme ... From: mugwa@yahoogroups.com...
Chris Holme
cholme@...
Mar 19, 2006 8:29 pm
... Woo! Having done a fair bit of this myself, and watched as others have done even more, I can stress one very important point. MAKE SURE you have your GPS...
Hi Dave We are going to make it real easy and use J2ME, it has an API called the location API, bet you can't guess what it does. yep thats right it handles all...
cholme@...
Mar 20, 2006 5:31 am
Hello People I don't know if anybody remembers but a year or two ago I had problems with turning relays on and off resulting in micro resets. I was using a ...
Chris Holme
cholme@...
Apr 7, 2006 12:22 am
The problem with high voltage spikes is that they can travel along active wires and also ground wires. Using a ferrite bead can work. However using a Solid...
Work colleague had nearly exactly the same problem, turned out to vanish when he ran separate power runs back to the main switchmode PSU. "Star wiring" both...
Well, since someone else is definitely going, then I will too. Done some interesting things and got some nice new toys since I seen ya awl. :-) Regards Chris...
Chris Holme
cholme@...
Mar 19, 2006 8:29 pm
Hi Andrew, No, its been very quiet. Mainly members of the WACEG. Steve John Ian and myself. Ron... _____ From: mugwa@yahoogroups.com...
... Tut tut,.... back in MY day, we'd have an oscilloscope hooked up to a loop of wire with a diode in it specifically designed to drop the GPS sat frequencies...
Yep an ta vera much. One day I am going to catch you and force that coffee upon you. Another thing that location API does is provide a landmark store for your...
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