HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
TJ McDermott
User Rank
Blogger
Is this actually used?
TJ McDermott   10/2/2012 11:09:31 AM
NO RATINGS
Are compact flourescent lightbulbs protected with this technology?  If they are, why are there so many anecdotes of them overheating, burning, and arcing when they fail?

CFL bulbs have an overall very negative reputation because of this.

naperlou
User Rank
Blogger
Re: Is this actually used?
naperlou   10/2/2012 11:29:21 AM
NO RATINGS
TJ, I had not heard that.  My experience with CFLs is that they do not last nearly as long as rated.  I expect that the reason is that they are cycled far more often than they are designed for.  We do that with incandescant bulbs and think nothing of it.  Might this overvoltage protection approach help with that problem?

TJ McDermott
User Rank
Blogger
Re: Is this actually used?
TJ McDermott   10/2/2012 11:59:07 AM
NO RATINGS
Naperlou, I would hope so.

Snopes.com reports the fire hazard is a sort of urban legend

http://www.snopes.com/inboxer/household/cflbulb.asp

However, their own refutation text is cause for alarm:

CFLs (compact fluorescent lamps) don't burn out the way incandescent light bulbs do. Instead, as they near the ends of their lives, they grow dimmer. While some CFL bulbs merely stop emitting light when they finally quit working, others kick the bucket with a dramatic "pop"! sound and then vent a distinct odor. A few even release a bit of smoke at their termination. Sometimes the bases of the bulbs turn black. This seemingly cataclysmic reaction has to do with the breakdown of the bulb's ballast, which is contained in the part of the bulb that is screwed into the socket. As the bulb ages and degrades, so does its ballast. Yet as scary as odors, smoke, and even blackening of the base of the bulb might be, these lamps are fireproof and are meant to fail safely at the end of their lives.

 An incandescent lightbulb does not turn black, does not emit smoke or an odor when it fails naturally.

How is this better than an incandescent bulb?  Maybe the technology described in this article prevents the failure symptoms listed above.  I hope so; it might improve the image of the bulbs.

The alleged cost savings aren't there.  The light given isn't as bright.  They fail in a messy and annoying manner.  I forget why they're being forced on us.

 

loadster
User Rank
Gold
ahead of ourselves
loadster   10/4/2012 12:31:54 PM
NO RATINGS
The ballast referenced is a T5 14W circuit built for the linear tube fluorescents in commercial and shop applications. They have end-of-life issues different from CFLs

Though related, I think this circuit is chasing problem of low population as I understand new fluorescent ballasts have requirements to be more EMI and otherwise future modulation distribution compatible. Hopefully, this problem is addressed by smarter self-protection circuits.

The takeaway should be that as engineers with low wattage circuits we need to understand that PWM and boost power supplies can create fire hazards that need to be anticipated early in design.

No B.S?

Natacha Watson
User Rank
Iron
Electronic Ballasts
Natacha Watson   1/17/2014 4:31:08 AM
NO RATINGS
Nice tips thanks! I've found some great ballast models in here for more insights: http://www.directindustry.com/cat/power-supplies/electronic-ballasts-C-2039.html



Partner Zone
Latest Analysis
Self-driving vehicle technology could grow rapidly over the next two decades, with nearly 95 million “autonomous-capable” cars being sold annually around the world by 2035, a new study predicts.
MIT’s Senseable City Lab recently announced the program’s next big project: “Local Warming.” The concept involves saving on energy by heating the occupants within a room, not the room itself.
The fun factor continues to draw developers to Linux. This open-source system continues to succeed in the market and in the hearts and minds of developers. Design News will delve into this territory with next week's Continuing Education Class titled, “Introduction to Linux Device Drivers.”
Dean Kamen tells an audience at MD&M East 2014 how his team created the DEKA Arm to meet DARPA's challenge to design a better prosthetic arm for wounded veterans.
The new draw-it-on-a-napkin is the CAD program. As CAD programs become more ubiquitous and easier to use, they have replaced 2D sketching for early concepting.
More:Blogs|News
Design News Webinar Series
7/23/2014 11:00 a.m. California / 2:00 p.m. New York
7/17/2014 11:00 a.m. California / 2:00 p.m. New York
6/25/2014 11:00 a.m. California / 2:00 p.m. New York
5/13/2014 10:00 a.m. California / 1:00 p.m. New York / 6:00 p.m. London
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Aug 4 - 8, Introduction to Linux Device Drivers
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Class: August 12 - 14
Sponsored by igus
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service