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Jerry Grimmonpre'
Joined: 09 Jan 2006
Posts: 144
Location: Huntley, Illinois 60142
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 Posted: Mon Feb 26, 2007 5:45 am Post subject: Questions |
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Bob ...
Forwarded question from my son to the AeroElectric list
Thanks for your answer ...
Jerry Grimmonpre
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aurbo(at)ak.net
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| Posted: Mon Feb 26, 2007 6:37 am Post subject: Questions |
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Jerry,
I hope you get a better answer than what I am going to supply. My very basic understanding is that the diodes are there to protect your switches from wearing out. There is supposed to be some sort of arcing that goes on when you turn the switch on and off which can be lessened or nullified with a diode. How much longer will your switch last? Is it worth it for the $time$ spent worrying about it? Good questions? Anyone?
Mike Ice
RV-9
Anchorage, Alaska
[quote] ---
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bob(at)bob-white.com
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| Posted: Mon Feb 26, 2007 7:36 am Post subject: Questions |
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Any time you interrupt the current in a coil, the magnetic field
collapse induces a voltage in the coil. The voltage induced is
dependent on how fast the field changes and is the opposite polarity
to the applied voltage that caused the current flow. It can produce
arching in the switch as you have surmised. Since this voltage is the
opposite polarity, it will forward bias a diode placed across the coil
with the anode connected to the negative terminal and the cathode
connected to the positive terminal. The diode is a low resistance load
for the induced voltage which limits it to the forward voltage of the
diode.
On the solenoids with a single terminal that needs to be grounded to
activate the coil, the other side of the coil is connected internally
to one of the contact terminals. That terminal must be connected to
the battery for proper operation. Proper placement of the suppression
diode is cathode to the battery terminal and anode to the terminal to
the switch.
It is a good idea to include the diode.
Bob W.
On Mon, 26 Feb 2007 05:34:24 -0900
"Michael T. Ice" <aurbo(at)ak.net> wrote:
[quote] Jerry,
I hope you get a better answer than what I am going to supply. My very basic understanding is that the diodes are there to protect your switches from wearing out. There is supposed to be some sort of arcing that goes on when you turn the switch on and off which can be lessened or nullified with a diode. How much longer will your switch last? Is it worth it for the $time$ spent worrying about it? Good questions? Anyone?
Mike Ice
RV-9
Anchorage, Alaska
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