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› Design the Simplest DC UPS with super capacitor for home router and raspberry pi

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Design the Simplest DC UPS with super capacitor for home router and raspberry pi
RustyOx Offline
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#1
28-03-2023, 06:21 PM (This post was last modified: 06-05-2023, 08:15 AM by RustyOx.)
Schematic



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. 
   
  • Super capacitor example:
   
  • Capacitor energy calculation:
Assume discharge  from 12v to 6.5v, voltage  drop is 5.5v.

   
From: http://www.learningaboutelectronics.com/...ulator.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. 


   
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:
   
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