2021-07-11

[public] 154K views, 8.69K likes, dislikes audio only

GreatScott!

Altium Designer: https://altium.com/yt/greatscott!

Previous video: /youtube/video/ohQF79cMODw

AC VS DC video: /youtube/video/trmxzUVT2eE

How dangerous are LiPo Batteries video: /youtube/video/osfgkFyq7lA

Facebook: https://www.facebook.com/greatscottlab

Twitter: https://twitter.com/GreatScottLab

Support me for more videos: https://www.patreon.com/GreatScott?ty=h

You can get some decent LiPo chargers here (affiliate links):

https://www.elektor.com/diy-lipo-supercharger-kit-by-greatscott

https://s.click.aliexpress.com/e/_AM68Dj

https://s.click.aliexpress.com/e/_A8nfZn

Websites which were shown in the video:

https://cdn-shop.adafruit.com/datasheets/503562+1200mah.pdf

https://sites.google.com/site/donutscience/various-projects/the-easiest-diy-lithium-polymer-battery-charger/the-easiest-diy-lithium-polymer-battery-charger---the-schematic

https://www.circuitstoday.com/lipo-battery-charger-circuit

http://www.tp4056.com/d/tp4056.pdf

https://www.ti.com/lit/ds/symlink/bq24091.pdf?ts=1625045712665&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FBQ24091

https://www.ti.com/lit/ds/symlink/lm317.pdf

In this episode of testing circuits I found on the internet I will be having a look at LiPo battery charger schematics. I will build up 2 very simple circuits which claim to charge a LiPo battery and test whether they can truly do that. One circuit is based around an LM317 adjustable regulator while the other one is based around an Op-Amp. I will show you the flaws of those simple design and while I am at it also show you my own super simple, very inefficient but safe LiPo charger. Let's get started!

Thanks to Altium for sponsoring this video.

Music:

2011 Lookalike by Bartlebeats

0:00 LiPo Battery charging in general

1:45 Intro

2:25 How to properly charge a LiPo battery

3:56 Testing circuit 1 (LM317)

7:58 Testing circuit 2 (OpAmp)

10:20 Making my own LiPo charger (CC/CV)

11:49 Verdict