Breaking News
Comments
Newest First | Oldest First | Threaded View
cgul
User Rank
Rookie
re: Implementing battery charger using Li-ion
cgul   9/27/2012 6:39:20 PM
NO RATINGS
Implementing battery charger using Li-ion. I have used Linear Technologies battery chargers for Li-Ion and Li-Poly. They work great. Using digital pots in place of fixed resistors for the charging voltage and charging current. These of course controlled with a micro-controller. life doesn't get any better than that. The micro allows for charging algorithms to suit different battery chemistry's and provides for status flexibility. It doesn't get any simpler than that. Piece of cake.

anne-francoise.pele
User Rank
CEO
re: Implementing battery charger using Li-ion
anne-francoise.pele   7/16/2012 3:25:01 PM
NO RATINGS
In Part One of this two-part article, Cypress describes different types of rechargeable batteries, their differences and how to select a battery technology for a specific application. The article is available here: http://www.eetimes.com/design/smart-energy-design/4375627/Battery--The-source-of-a-device---Part-1?Ecosystem=smart-energy-design

Hughston
User Rank
CEO
re: Implementing battery charger using Li-ion
Hughston   7/9/2012 4:09:09 PM
NO RATINGS
I don't think they mean to use the PSoC strictly for this function, but as a part of the overall PSoC system function. The battery health can be judged by a gas gage IC. They generate pulses proportional to the current versus time of the charge. Use it with a processor and you can make decisions about battery life.

Hughston
User Rank
CEO
re: Implementing battery charger using Li-ion
Hughston   7/9/2012 4:00:28 PM
NO RATINGS
Sometimes a regulator with a current limiting resistor on the input side is used as a cheap coin cell charger. The precharge time is very short, under a minute, on a Li-Ion battery. I think if the resistor was on the output side, it would be hard to top off the battery. You can use a simple 2 transistor circuit to up the current when the cell voltage goes up.

WKetel
User Rank
Rookie
re: Implementing battery charger using Li-ion
WKetel   7/4/2012 5:12:02 PM
NO RATINGS
Now a question about simplification of the process: would a current limited constant voltage charge work as well? It would not be as fast, it may take overnight to recharge completely, but it would certainly be simpler. Most importantly, would it damage the cells to start out with a current limited constant voltage charge? Or is it a situation that must have the higher voltage at the beginning?

MarkeSys
User Rank
Rookie
re: Implementing battery charger using Li-ion
MarkeSys   6/28/2012 7:11:34 PM
NO RATINGS
Another possibility for being able to use a single-ended ADC in this system would be to simply put a small-value resistor in series with the negative terminal of the battery pack, before its ground connection. This way the microcontroller system and the power supply can share the same ground. There is a small efficiency cost, but this can be mitigated by using a very small-value resistor, (for example, a 0.1 ohm resistor at 100mA would drop 10mV, at a power cost of only 1 mW).

Sanjib.A
User Rank
CEO
re: Implementing battery charger using Li-ion
Sanjib.A   6/26/2012 4:37:17 PM
NO RATINGS
Unless a sophisticated charging circuit is needed, using a PSoC would be an overkill. In general standard charging ICs will need a lot less design efforts. But some time, the user might need to know the health life of the battery, how many charging cycles took place etc. In that case this will be helpful.

GREAT-Terry
User Rank
CEO
re: Implementing battery charger using Li-ion
GREAT-Terry   6/26/2012 3:58:46 PM
NO RATINGS
Good article!



Flash Poll
Top Comments of the Week
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed

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
Max Maxfield

The Best of the Best Videos on YouTube
Max Maxfield
4 comments
A couple of days ago, my chum Paul was visiting me in my office. He'd wandered over from his cubicle in the next bay to take a brief coffee break. This week, Paul had been admiring the ...

Jolt Judges and Andrew Binstock

Jolt Awards: The Best Books
Jolt Judges and Andrew Binstock
1 Comment
As we do every year, Dr. Dobb's recognizes the best books of the last 12 months via the Jolt Awards -- our cycle of product awards given out every two months in each of six categories. No ...

Engineering Investigations

Air Conditioner Falls From Window, Still Works
Engineering Investigations
2 comments
It's autumn in New England. The leaves are turning to red, orange, and gold, my roses are in their second bloom, and it's time to remove the air conditioner from the window. On September ...

David Blaza

The Other Tesla
David Blaza
5 comments
I find myself going to Kickstarter and Indiegogo on a regular basis these days because they have become real innovation marketplaces. As far as I'm concerned, this is where a lot of cool ...