Timeline for Charging circuit for a LiFePO₄ cell
Current License: CC BY-SA 4.0
10 events
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| Nov 13, 2020 at 8:38 | comment | added | tonny | @SamGibson. I've appended my sources. In source #4 You could read hclarkx post. It's similar with my finding. No charging will occur when input = output. As for my smartphone charger, it's universal charger using IC. When charging li-ion smartphone, it use CC CV. But when I'm driving Microcontroller or LED, it act like using CC. For charging my LFP, cause maybe bacause I use dc-dc buck, the charger see it as something like microcontroller. Meaning, it uses CC. | |
| Nov 13, 2020 at 8:30 | history | edited | tonny | CC BY-SA 4.0 |
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| Nov 13, 2020 at 7:31 | comment | added | tonny | @SamGibson. Noted, and thanks for your input. I'll research further about this. From dozens videos, papers and articles that I read, none use smarphone charger, but a few use scaled solar panel to charge LFP . I've 3 different cell brand with different Ah, 2 different buck converter, and a few smartphone charger. Will try my method with the other 2. Me replying here, of course with the intent to help the OP. I usually just read. And I have no problem with down-voters too, as long as they give explanations, what is wrong with my answer. I'm still learning. | |
| Nov 12, 2020 at 18:00 | comment | added | SamGibson♦ | tonny - Hi, Please note that I don't care about this topic. I just tried to help you by replying why someone may have downvoted you. I don't agree about some of your update (e.g. a smartphone "charger" is not CC; you say that termination occurs automatically "when input = output" but that doesn't agree with all the LiFePO4 battery datasheets I have read, which specify a cut-off current when charging should be stopped; etc.). Your answer seems to describe what worked for you. That's fine on a forum; but on SE, answers must address the OP's question, not just what works for you. I'll stop here. | |
| Nov 12, 2020 at 17:49 | history | edited | tonny | CC BY-SA 4.0 |
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| Nov 12, 2020 at 17:33 | history | edited | tonny | CC BY-SA 4.0 |
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| Nov 12, 2020 at 16:09 | comment | added | SamGibson♦ | tonny - Hi, It wasn't my downvote, but personally I disagree with the plan in your answer - perhaps the downvoter disagreed so much that they downvoted? The correct charging profile for LiIon, LiPo and LiFePO4 involves a current-limited initial CC phase, then CV, then the CV terminates when the charge current has dropped to a specified value. Your answer doesn't mention any of that, nor is it clear how your charging terminates. Using a CV source as you describe, could exceed the rated CC current, and has no mechanism to detect when the charge current drops at the end of the CV phase. True? | |
| Nov 12, 2020 at 15:34 | review | Late answers | |||
| Nov 14, 2020 at 16:50 | |||||
| Nov 12, 2020 at 15:27 | comment | added | tonny | Person that give minus point: Could you give a reason why? Did I do something wrong? How good your knowledge about LiFePo4? You can share here for us to know. | |
| Nov 12, 2020 at 15:18 | history | answered | tonny | CC BY-SA 4.0 |