Breaking News
Power Tips

Power Tip 52: Making over the wall wart

NO RATINGS
View Comments: Newest First | Oldest First | Threaded View
nicolas.mokhoff
User Rank
Rookie
re: Power Tip 52: Making over the wall wart
nicolas.mokhoff   10/24/2012 1:17:36 PM
NO RATINGS
Thanks, Robert. Links in story have been corrected.

Robert K
User Rank
Blogger
re: Power Tip 52: Making over the wall wart
Robert K   10/5/2012 1:48:34 PM
NO RATINGS
Try these links, the last two in the article are wrong. http://www.ti.com/tool/pmp7389 http://www.ti.com/tool/pmp8286

Hughston
User Rank
CEO
re: Power Tip 52: Making over the wall wart
Hughston   10/4/2012 3:27:58 PM
NO RATINGS
This doesn't look much more expensive than a linear wall wart. A linear would have the input fuse, transformer, rectifier on the secondary, large filter cap and a load resistor to drain the cap charge. The rectifier is not always in the wall wart; it can be in the charged product. A more efficient way to use a linear wall wart is to give it a higher source impedance and put a switch in the product being charged and pulse charge with the input.

WKetel
User Rank
Rookie
re: Power Tip 52: Making over the wall wart
WKetel   10/4/2012 12:37:59 AM
NO RATINGS
The one more easy way to cut losses, at this point, is to add a switch so that the AC input can be switched off. That should have been mandated 40 years ago when the wall warts were starting to appear. Of course it would have been a serious hardship and it would have raised the cost of each unit by about 15 cents, but consider how much wasted power it would have saved. At some point the folks who make all of the laws need to tell the whiners and complainers to "shut up, because we don't care about the profit that you lose." If it is OK to mandate all kinds of efficiency increases in cars, which requires all manner of new innovations, it should certainly have been OK to mandate on/off switches, which were nothing new, and very well understood.

GREAT-Terry
User Rank
CEO
re: Power Tip 52: Making over the wall wart
GREAT-Terry   10/1/2012 11:08:40 AM
NO RATINGS
It is a good idea to use "quasi-resonant flyback" in low power wallwart design. It circuit is so simple! How much can be further reduced?

Most Recent Comments
Kevin Krewell
 
daleste
 
Ian Johns
 
Etmax
 
daleste
 
alex_m1
 
Ian Johns
 
David Ashton
 
MeasurementBlues
Top Comments of the Week
August Cartoon Caption Winner!
August Cartoon Caption Winner!
"All the King's horses and all the KIng's men gave up on Humpty, so they handed the problem off to Engineering."
5 comments
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Times on Twitter
EE Times Twitter Feed
Radio
LATEST ARCHIVED BROADCAST
David Patterson, known for his pioneering research that led to RAID, clusters and more, is part of a team at UC Berkeley that recently made its RISC-V processor architecture an open source hardware offering. We talk with Patterson and one of his colleagues behind the effort about the opportunities they see, what new kinds of designs they hope to enable and what it means for today’s commercial processor giants such as Intel, ARM and Imagination Technologies.
Flash Poll