All Questions
Tagged with supercapacitor backup
10
questions
3
votes
2
answers
517
views
Super capacitors derating
I want to use supercaps in a system for minimal power interruption backup (1-2 seconds). My systems works at - 40 to 85°C.
I have seen that supercaps are usually rated for 1000 - 2000 hours at max ...
- 107
0
votes
1
answer
261
views
Design for passive power backup for ESP32 for a few milliseconds
I am designing a logger system with an ESP32 in which the logs are uploaded to the IoT cloud and parallelly logged to a local SD card. On Power loss detection, I want the ESP32 dump all the data that ...
2
votes
0
answers
67
views
5 V holdup/ temporary backup circuit
I have a project where I'm using an android tablet to power a serial relay, the relay is 20 m from the tablet so I'm using a USB C > USB A hub and a self powered USB over CAT6 extender. When the ...
- 21
-1
votes
2
answers
346
views
Leaving super-capacitor connected to power supply
I want to use a 1F-5.5V super-capacitor as a power backup for a 3.3V circuit. As I searched the internet I have to use a circuit for charging the super-capacitor to stop charging when the voltage ...
- 289
4
votes
1
answer
595
views
Can a memory backup supercap hold on for more than 2 weeks?
Most RTC chips have a VBATT input for backup power supply; besides a battery, you can use a supercap there, e.g. using the following scheme:
simulate this circuit – Schematic created using ...
- 5,469
0
votes
1
answer
462
views
super capacitor's maximum charge current
I am designing a backup system based on a supercap and an LTC4041.
The calculations by the guidlines in the datasheet brought me to the folowing parameters:
Capacity:2.4F
Charge current: 1A
charge ...
- 173
1
vote
1
answer
648
views
Super capacitor backup circuit
I want to implement a momentary power backup in my circuit using a supercapacitor. I have come up with the following circuit. Am I right in implementing the super capacitor like this? Also, the input ...
- 111
0
votes
0
answers
986
views
esp-12 power supply + backup by 4F capacitor 5.5v + ME2149, is it working?
I made my own energy meter using esp-12, I need to save data to esp spiffs when loss grid power, In this case, I do not need wifi than esp turn to modem-sleep mode, so working current is about 20 - ...
- 213
0
votes
1
answer
65
views
Only Provide Backup Power to One Device On Bus With Cap/Supercap
In a robotic system I am designing, the computer, motor controller and motor amplifier circuits all run on the same 24VDC power bus, which is provided by a switching power supply. Like below:
In the ...
- 103
6
votes
1
answer
5k
views
Coin cell battery recharging circuit for RTC backup power
I am designing a system that contains an RTC to for displaying the date and time on a user interface, as well as log events with time stamps. In this particular case, the system gets powered-on at ...
- 665