Questions tagged [supercapacitor]
Very high energy-density capacitors, typically measured in farads.
29
questions
24
votes
3
answers
46k
views
How long would a 150 farad capacitor light up an LED?
I have a bright white LED from a flashlight. Approximately how long will it light up with a 150 farad 2.5 volt capacitor? Do I need a resistor? If so, how many Ω? The capacitor is a Maxwell 150 ...
- 10.2k
21
votes
4
answers
3k
views
Supercap compared to a battery
What is the current state of things when it comes to super capacitors and batteries? Are super caps anywhere near rivalling LiPo's in capacity?
I've often heard people talking about super caps as ...
- 31.9k
13
votes
5
answers
44k
views
Supercapacitors as car batteries [closed]
I've seen YouTube videos of supercapacitors replacing car batteries. Is this practical? And if so, why haven't they been offered in the automotive market place?
https://www.youtube.com/watch?v=...
- 498
8
votes
3
answers
10k
views
Powering an Arduino with a Supercapacitor
For the purpose of a project I wish to power an arduino using a supercapacitor charged to 5V. The supercapacitor will be fed straight into the power Vin and GND terminals on the Arduino. No power plug ...
- 141
4
votes
1
answer
1k
views
RTC super capacitor is discharging very fast
I am using a PCA85073A RTC in my design. On some boards, the supercapacitor discharges very fast (5V to 1.1V in half an hour.)
This happens when we turn off 5V_uC.
The circuit is given below.
All the ...
- 2,593
2
votes
2
answers
7k
views
Limiting supercapacitor charging inrush
This is somewhat a duplicate.
I'm looking for a way to limit the inrush current of a small supercapacitor circuit. Input is regulated 5V (USB), output feeds a 3.3V regulator. Goal is a 10s runtime at ...
- 515
11
votes
3
answers
14k
views
How durable is a supercapacitor?
Suppose I have a device that utilizes a supercapacitor.
How long will it take to wear out the supercapacitor so that it needs replacement?
- 12.5k
10
votes
4
answers
13k
views
How practical would a car booster using supercapacitors be?
Currently car boosters (a portable unit charged of an outlet and then connected to the car electrical system to start a car when the car battery is dead) typically use batteries - lead-acid, Li-Ion or ...
- 12.5k
10
votes
4
answers
20k
views
Controlling high current (1000A) with MOSFETs
I am currently designing a capacitive discharge spot welder and am running into the issue of switching.
I plan to use a few super capacitors in series to discharge around 1000A in a very short ...
- 1,050
9
votes
5
answers
3k
views
How to work with supercapacitors?
I'm thinking of using a supercapacitor to power a device with low power consumption. I have one 1 F capacitor rated at 5.5 V and I plan to charge it using input voltage of 5 V.
What precautions ...
- 23.5k
9
votes
1
answer
3k
views
Constant power discharge of a non-ideal capacitor
My employer sells boost converters to hold up motor drives during power loss. These boost converters are fed from capacitor banks. In order to size these banks correctly, we need to take their voltage,...
- 17.6k
7
votes
2
answers
14k
views
Super Capacitor Charge and Discharge Circuit
I am working on adding a super-capacitor to one of my 5V lines. Foolishly I tried adding the super-capacitor directly to the 5V line, but it over stresses my regulator to charge it all at once.
I ...
- 179
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
5
votes
2
answers
1k
views
Ignition coil arc initiation with protected low voltage continuation?
I'd like to initiate a spark plug arc with an ignition coil and then power the resulting (highly conductive) plasma with an ultracapacitor (low voltage, say 12V to 24V, and high current) without ...
- 243
2
votes
3
answers
632
views
What is the best way to balance supercapacitor cells at 700mA peak charging current
So I want to charge a stack of six series-connected super capacitors from a small 10W solar panel.
The part number of the capacitors is TPLH-2R7/12WR10X30.
https://www.tecategroup.com/products/...
- 12.4k