Design Con 2015
Breaking News
Comments
Oldest First | Newest First | Threaded View
Page 1 / 2   >   >>
jonnydoin
User Rank
Blogger
re: Surge protection—Stop fried electronics
jonnydoin   8/9/2012 9:23:48 AM
NO RATINGS
The article mentions 8/20 surge pulses as 8ms/20ms. That's wrong. The time scale is in microseconds. A pulse of 8kV with 20ms decay is a *very* large energy. TVSes are capable of absorbing power up to 400~5000W, depending on the model, but a 20ms pulse would require a much larger device. - Jonny

Mike Fahrion
User Rank
Rookie
re: Surge protection—Stop fried electronics
Mike Fahrion   8/9/2012 4:05:52 PM
NO RATINGS
Great catch Jonny - the mu symbol in the text got lost in the web translation. We'll get that corrected.

CMathas
User Rank
Blogger
re: Surge protection—Stop fried electronics
CMathas   8/9/2012 4:48:47 PM
NO RATINGS
Sorry, I didn't catch the change in the translation. It is fixed now. Thanks for letting us know.

TonyDave
User Rank
Rookie
re: Surge protection—Stop fried electronics
TonyDave   8/10/2012 8:24:29 AM
NO RATINGS
Hi, Surge? "An uninterrupted voltage increase that lasts more than a few seconds is usually called a "voltage surge" rather than a spike." Nice article about Transient protection, what about the surges. Try 150% for 1/2S (with a profile). Now thats a surge. Stokersson

EREBUS0
User Rank
Rookie
re: Surge protection—Stop fried electronics
EREBUS0   8/11/2012 8:59:41 PM
NO RATINGS
Personnally, I like my circuits fried with a touch of tobasco sauce. Seriously, you need to put protection on all of your inputs or pay the consequences. Regardless of surge or spike, over voltage destroys semiconductors in femtoseconds. Anyone remember the old UV erasable proms? I could destroy one from five feet away just from the static charge I would build up walking over the tile floor. Zaap! It's done.

I_B_GREEN
User Rank
Rookie
re: Surge protection—Stop fried electronics
I_B_GREEN   8/12/2012 9:45:57 PM
NO RATINGS
Only thing missing is an inductor in place of or in series with the resistor. Allows for much more energy withstand. fulcrums energy from (referenced in voltage)shunt protection downstream to GDT via inductor voltage rise due to di/dt. Care must be taken to not saturate core, air gap recommended.

TM123
User Rank
Rookie
re: Surge protection—Stop fried electronics
TM123   8/12/2012 10:18:40 PM
NO RATINGS
I have found that allowing the entire voltage supply (including 0 Volts) to float enables the circuit to float around any surge/spike. In this case, there are a number of capacitors connecting various voltages, inputs and outputs to the real ground. A device I use lots of is the good old Pi Filter (or capacitor input filter) on every power supply rail, input and output, along with extra series inductors - everywhere. To date, I have protected uProcessors, and low voltage electronics (5 Volt, 12 Volt) successfully against voltage discharges around the 8 MV mark (we have electronics inside an Ion Accelerator). Warning - do not use MOVs as when they fail, they fail short which will require replacement. Use protective devices that are self recovering so the protective components do not become part of the problem.

David Ashton
User Rank
Blogger
re: Surge protection—Stop fried electronics
David Ashton   8/13/2012 12:06:58 AM
NO RATINGS
Point taken about MOVs, but they are capable of absorbing a LOT of energy, even if they fail shorted. I used to live in Zimbabwe, which has bad lightning during the summer. A company I dealt with there used big MOVs in their mains surge arrestors and they worked a treat. Better to replace a $ 35 mains surge protector than a TV/Video installation. Same company did some tests and found that a knot in the 3-core mains supply cable provided a lot of protection as well - added inductance. I used to knot all my cables after that and never had a problem with my mains inputs.

David Ashton
User Rank
Blogger
re: Surge protection—Stop fried electronics
David Ashton   8/13/2012 12:10:19 AM
NO RATINGS
While you're fixing stuff Carolyn, on page 2 2nd para is: "6 feet of 18AWG wire has approximately .039 W resistance." W should of course be the ohms symbol - which is Capital W in Symbol Font.

GREAT-Terry
User Rank
CEO
re: Surge protection—Stop fried electronics
GREAT-Terry   8/14/2012 8:54:22 AM
NO RATINGS
Good. Is there any difference between putting 2 unidirectional TVS and a single bidirectional TVS? I usually use 2 uniderectional but frankly have no idea if a single bidirectional has poorer. Agree also to add air core inductor in series with the resistor,

Page 1 / 2   >   >>


Top Comments of the Week
Flash Poll
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Carlos Bueno

Adventures in Userland
Carlos Bueno
Post a comment
Editor’s Note: Excerpted from Lauren Ipsum: A story about computer science and other improbable things, author Carlos Bueno introduces us to Lauren and her adventures in ...

Max Maxfield

Tired Old iPad 2 vs. Shiny New iPad Air 2
Max Maxfield
9 comments
I remember when the first iPad came out deep in the mists of time we used to call 2010. Actually, that's only four years ago, but it seems like a lifetime away -- I mean; can you remember ...

Martin Rowe

Make This Engineering Museum a Reality
Martin Rowe
Post a comment
Vincent Valentine is a man on a mission. He wants to make the first house to ever have a telephone into a telephone museum. Without help, it may not happen.

Rich Quinnell

Making the Grade in Industrial Design
Rich Quinnell
16 comments
As every developer knows, there are the paper specifications for a product design, and then there are the real requirements. The paper specs are dry, bland, and rigidly numeric, making ...

Special Video Section
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...
Avago’s ACPL-K30T is the first solid-state driver qualified ...
NXP launches its line of multi-gate, multifunction, ...
Doug Bailey, VP of marketing at Power Integrations, gives a ...
See how to ease software bring-up with DesignWare IP ...
DesignWare IP Prototyping Kits enable fast software ...
This video explores the LT3086, a new member of our LDO+ ...
In today’s modern electronic systems, the need for power ...