The smallest USB-C LiPo charger
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SCHEMATICS-Ant-USB-C-LiPo-Charger-LP-CHG-USB-01-S1.1.pdfSchematics v1.1Adobe Portable Document Format - 1.02 MB - 09/24/2019 at 10:49 |
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ant-usb-c-charger.stepstep - 7.11 MB - 08/09/2019 at 23:42 |
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ant-usb-c-enclosure-top.stepstep - 66.17 kB - 08/09/2019 at 23:41 |
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ant-usb-c-enclosure-bottom.stepstep - 107.06 kB - 08/09/2019 at 23:41 |
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ant-usb-c-enclosure-top.stlStandard Tesselated Geometry - 59.65 kB - 08/09/2019 at 23:41 |
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The stock is finally replenished!
The first samples were sold out quickly. More in stock will be available in the mid-September.
I have manually assembled the first couple of samples for sale on Tindie!
I have finished the design of the lid for the case for the mini-power bank which can be used in small projects, where regulated voltage is not required.
I have also tested out a concept of having the indication with LEDs through a thinned plastic. A near cut-out has 0.2mm thickness, while the rest of the lid has thickness of 2 mm. When there is no light source inside of the enclosure, the near cut-out is not visible from outside.
I have used Fusion 360 to make a quick enclosure for the charger and a 500mAh LiPo battery. Have made some renderings to show the progress. The outside dimensions of the enclosure are 55 x 35 x 10 mm. The design is prepared for a cover on the top, which will be held by two latches and two M3 screws, screwed directly in the plastic.
Going to it print on my Ultimaker 3 soon.
I have soldered the wires from a brand new 500 mAh LiPo battery to the charger to make a first serious test. The internal resistance and high SoC put the charger in a constant voltage mode in about 10 minutes. I have measured the voltage across the battery (4.192V) to verify that it is not a thermal throttling.
The reason for using USB-A to USB-C cable is because I don't have a USB power meter with USB-C connector. It is more handy to use USB power meter rather than measure the battery current with the multimeter. However, I have tested it with USB-C to USB-C cable as well, and it seems to work, since the charger gets warm.
The next step is to make a simple enclosure, which integrates charger with the battery.
I have manually assembled the first prototype!
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This is a very exciting project. Are you planning on putting these up for sale on Tindie?
Thank you Tom! Yes, I'm planning on selling it after I verify the design. Right now I only had time to solder everything and do a smoke test.
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Great design, thnx for sharing