Uninterruptable 12v power supply

This board functions essentially like a UPS for 12v systems.    It takes 12v power input, provides 12v power output, and is normally connected to a 3 cell 18650 lithium battery.

If the input power stops for some reason, the output will continue to receive power.   This is suitable for pypilot, including the standard motor controller for tillerpilots, or even radios, lights or other accessories.   It is useful to protect critical loads from the main battery failing, and/or less than perfectly reliable interconnections and fuses or circuit breakers supplying power to a device.

The lithium battery is maintained at a safe floating voltage of 12 volts (4 volts per cell) to avoid losing capacity over time.

The power is redirected from the correct source using ideal diodes.

Battery not included, but tested with this pack:

https://www.aliexpress.us/item/3256806608124107.html

Schematic:

http://pypilot.org/schematics/pypilot_power_pack.pdf