Design the Simplest DC UPS with super capacitor for home router and raspberry pi - Printable Version +- rusty ox (https://rusty-ox.swavesey.org) +-- Forum: Swavesey (https://rusty-ox.swavesey.org/Forum-Swavesey) +--- Forum: Rusty Ox (https://rusty-ox.swavesey.org/Forum-Rusty-Ox) +--- Thread: Design the Simplest DC UPS with super capacitor for home router and raspberry pi (/Thread-Design-the-Simplest-DC-UPS-with-super-capacitor-for-home-router-and-raspberry-pi)

Design the Simplest DC UPS with super capacitor for home router and raspberry pi - RustyOx - 28-03-2023 Schematic [title_image] In:12V Out 1: 12V for home router  Out  2: 5V 3A dc/dc module Out 2: any voltage  C1: 16V 83(500/6)F R1: 100 Ohm 2W or 330 Ohm 1W D1: 3a schottky diode Discharge chart: todo Dc/dc module:  widely available from amazon or eBay  Search  adjustable  buck dc dc Converter, example picture below.  [attachment=1003] Super capacitor example: [attachment=1004] Capacitor energy calculation: Assume discharge  from 12v to 6.5v, voltage  drop is 5.5v. [attachment=1005] From: http://www.learningaboutelectronics.com/Articles/Capacitor-energy-calculator.php Run time calculation Assume  Raspberry Pi is consuming  0.5A at 5V, which is 2.5W. The run time for Raspberry  Pi is 502s which is about 8 minutes.  [attachment=1006] Ref: https://www.omnicalculator.com/physics/work-and-power This UPS is maintenance free (normal UPS needs battery which will be replaced regularly). The cost of component: DC/DC: £2 D1 and R1: £1 Supercapacitor 83F 16V: about  £35 Finished photo: [attachment=1030]