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DIY BATTERY CHARGER, PROTECTION AND BOOST

Mar 20th, 2020 | by: ELECTRONOOBS
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Usually, each time I have a project with a small battery that I also want to charge, I use a small charging module with USB connector. But then, all the other digital components usually work at 5V, but the battery is 3.7V. So, for that I add another small module, a boost converter to give me 5V. Usually we also need a battery protection so it won't overcharge, discharge or have a short circuit. What I've done was to add all these ICs on the same PCB so now we can charge a 3.7V LiPo or Li-Ion battery, protect it and then have a 5V or 12V boosted output. Let's see how I've made it.

PHOTO GALLERY

Below you have the scheamtic for version V1.0. Remember this version works ok but have in mind: The coil is small so it will have a maximum current output of 600mA. To switch from 5V to 12V or viceversa, you first must disconnect the battery from the input, otherwise the boost converter IC will fail. So, first select output voltage adn then connect the battery.
You have the values of each resistor, capacitor, inductor on the schematic. Use the same values in order to get the same output. Remember that Rprog will set the charging current for the battery.

5 Comments

  • Noob 1633

    about 2 months ago

    Hi are the suggested improvements eg parallel resistor for the switch and or the FS312 IC mentioned in the comments of the video implemented in the second version You list an under voltage protection of 26V DW01 24V in the feature list of V2 shop The FS312F ICs UVP seems be at 29V Also I would love to see an update with the improvements in action Last thing the link to V2 in the shop is missing in your Youtube description

    ELECTRONOOBS

    about 2 months ago

    Thanks for tip!

  • Noob 1633

    about 2 months ago

    Thank you for your feedback I still dont know though whether or not you included the improvements in your design There seems to be a version 3 in your shop now without the switch but the voltage to be set via a fixed resistor Please correct me if Im wrong you still list the over discharge protection of both the 21 and 30 design at 26 V isnt it 24 for the DW01 or 29V for the suggested FS312F ICLast thing as you already may have noticed The punctionation is stripped from the comments

    Noob 1633

    about 1 month ago

    Andrei?

  • Noob 2093

    about 29 days ago

    Hi I really liked this project I would like to have it but I need 5V 2A power input I am pretty new to schematics and I am still learning How can I achieve this

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