UPS (Uninterruptible Power Supply)

Based on user feedback, this UPS
 
 
product has been redesigned:
This product is suitable for applications requiring uninterrupted power during power outages. It uses external power when available and automatically and seamlessly switches to battery power during power outages. If using a Type-C interface, a decoy scheme is employed to support PD fast charging. Suitable for routers, cameras, development boards, and other devices, it seamlessly switches to battery power during power outages, ensuring uninterrupted network connectivity!
 
* Seamless switching between external power and battery power (no delay).
* Uninterrupted power supply, automatic restart during power outages, and automatic charging upon power restoration.
* Supports simultaneous charging and discharging. * Output voltage selectable at 5V/9V/12V; other voltages are customizable.
* Output voltage selectable at 5V/9V/12V. * Four practical functions: lithium battery charging, lithium battery protection, boost output, and UPS switching.
* Two-color LED indicator for charging status; a solid green light indicates full charge and automatically stops charging. * Type-C interface with high current capacity.
 
 
Solution: Instead of starting the device when plugged in after the battery is depleted, this product will charge the battery.
 
Functional Description: 1. UPS Function: When power is available at the input, fast charging is initiated via a trigger to directly power the load and charge the battery. Once power is lost, the battery circuit automatically activates to power the load via the boost circuit. 2. Boost Circuit: Peak power up to 20W, rated power up to 15W, BOST boost circuit, built-in 12A high-current MOSFET, efficiency up to 96%, module static power consumption 25mA, selectable 5V/9V/12V output.
       (Recommended for normal load conditions: 3. Lithium battery protection: overcharge, over-discharge, over-temperature, and over-current protection (if a short circuit occurs due to misoperation, the battery will enter a protection state and stop outputting; connecting to 5V charging will automatically activate and restore output).
4. The charging scheme adopts the TP5100 solution, reducing heat generation and increasing the charging current to 2A.
5. The battery uses two terminals connected in parallel as required.
 
 
Current version updates:
2024/9/21: First version design completed, awaiting board testing.
2024/9/29: First version soldered and tested, with modifications: changed power switching scheme, added DC input, removed one battery holder; second version design completed, engineering is the latest version, awaiting board verification.
2024/10/15: Second version soldered and verified, can be used normally.
 
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https://space.bilibili.com/3546744197483414?spm_id_from=333.1007.0.0 [Link to demo video: https://www.bilibili.com/video/BV1Pd2fYYEqf/?spm_id_from=333.999.0.0&vd_source=ecc12ab0f433ceb8d8f3ffb17f6da1a9 ] Comments and likes are welcome; your likes are my greatest support. QQ group: 1004260164. Those with ideas are welcome to contact me via the contact information on my homepage for communication or collaboration. I'm aiming to help 100 people realize their ideas.