Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [supercapacitor]

Very high energy-density capacitors, typically measured in Farads.

0
votes
0answers
21 views

Dynamic rolled-supercapacitor & Lorentz force & Induction?

I've been designing certain components that would have a supercapacitor attached to a movable (rotation/linear) element. The element is conductive and carries the current from (discharging state) the ...
0
votes
0answers
21 views

calculate time take to reach a threshold voltage based on the discharge rate of a supercap

I have a supercap as a backup power source for my embedded device whenever there is a power outage. I need to figure out the time from which point it would only take 10 seconds to reach 2.0V. What i ...
1
vote
1answer
134 views

Can I replace rechargable batteries with (super)capacitors?

I need a very small UPS just to give an embedded device time to shut down when power is lost. There are a variety of solutions that use LiPo batteries to provide extended runtime; they typically take ...
0
votes
0answers
47 views

Ultracapacitor doesn't charge

I am concerned about an ultracapacitor (2.7v, 3000F) that I received today. I set my power supply to 2.5v with a current limit of 1A, then connected a diode to the positive lead such that current ...
0
votes
0answers
52 views

Selecting a supercapacitor/boost regulator to handle intermittent power interruptions

Background: as part of a project, I want to have a camera transmitting video from a model railroad car. 18 V AC power can be obtained from the railroad tracks. However, contact with the track ...
1
vote
1answer
41 views

Supercap overvoltage protection

I'm building a circuit where a supercapacitor will be charged over wireless energy transfer (basically two coils near each other). This means I can not guarantee the voltage feeding the supercap is ...
1
vote
1answer
125 views

Simple solar panel + supercap powered arduino

Long version (full story, so skip and go direct to questions below if you want to): I have small arduino mini pro board powered by 230mAh Lithium coin battery used as wireless sensor (with NRF24L01 ...
0
votes
1answer
74 views

Supercapacitor charge current

i would like to buy a supercap for my project, something small likes 5F 10V . I have read some datasheet about supercap, but i do not completely understand if i can charge a super cap with, for ...
2
votes
1answer
74 views

Supercapacitor electric model

I am doing a dissertation in Electrical and Computer Engineer which involves supercapacitors. I read the norm IEC/EN 62391–1 and the 60384-1 but still I don't have a clear answer for what's the ...
2
votes
4answers
45 views

Measuring SuperCap current leakage avoiding voltages drops in ADC

I have a circuit with a SuperCap used as a battery. I want to know the curve of SC voltage in time to finnaly measure its self-discharge. Is this can be done with a simple arduino or another ...
3
votes
3answers
104 views

High Voltage ADC Measurements using a PIC and OpAmp

I need to make a device to measure voltage of a series stack of capacitors which will reach a maximum of 100V (DC only). On the schematic I have omitted several from the stack, balancing circuitry ...
0
votes
1answer
86 views

Step up converter 1-3V to 5V fixed for supercapacitor

I would like to use this step up converter, LT1073 - Micropower DC/DC Converter Adjustable and Fixed 5V, 12V, to drive an input in the range of 1 V to 3 V (input is a supercapacitor). In ...
4
votes
3answers
2k views

How to transfer energy generated from electromagnetic induction to a USB port?

For a school project, I'm creating a shake-powered phone power bank that will generate current similarly to a Faraday flashlight, which will in turn power a usb port. A simple enough concept. Now to ...
0
votes
1answer
73 views

Super cap discharge voltage level

In my design I have super capacitor (1.5 F) of maximum rated voltage of 5.5 V. I am charging it to only 3 V. I am using boost converter to convert it to 3.3 V so that I can utilize the super capacitor ...
2
votes
2answers
143 views

Lightest weight option to provide short bursts of power (250W x 4 seconds)

I'd like to mount mount a small pump to a surfboard to provide a small push to help catch waves. Normally to catch a wave you have to paddle furiously for about 4-5 seconds. So that's about ~ 1000 ...
0
votes
1answer
90 views

How much capacitance/joule/watt is needed on average household' energy storage system with supercapacitor?

I am on the process of making assumption how much capacitance/joule/watt is required on average supercapacitor as household' energy storage system. I plan the design for energy hub to be charged by ...
0
votes
2answers
69 views

P MOSFET turning on before gate threshold

I was simulating a P MOSFET, and for turning a P MOSFET on we need gate to Source voltage less then its threshold voltage. as per below simulation circuit at start VGS= 0, then there is no way mosfet ...
0
votes
1answer
62 views

Capacitor for spot welding

I've seen a video where the guy make a spot-welder using capacitors https://www.youtube.com/watch?v=1SMUFSiaV-8 AFAIK shorting capacitor is harmful. The question is: Are there any caps that can ...
2
votes
2answers
113 views

DIY adjustable buck boost converter with serial interface

I'm looking for a chip or schematic designing an adjustable buck-boost converter for charging supercapacitor cell with CC & CV capability and control it using the microcontroller serial interface. ...
0
votes
2answers
55 views

Cheap and simple way so switch on and off based on voltage, with hysteresis

I'm playing a lot with solar powered systems using ultracaps for energy storage. I'm also powering some small ~3.3V systems directly from LiFePO4 cells, charged by solar power. In both cases I'd like ...
17
votes
3answers
2k views

How to Measure Very Large Capacitance e.g. Super/Ultra Capacitors

I have recently acquired a couple of mysterious ultra/super capacitors from my brother. Apparently he doesn't remember any of the specifications or even brand... To further complicate matters, they ...
0
votes
1answer
25 views

How to do high switched current from small solar

I am working on a small, solar-powered application that makes use of RF and a few higher-power sensors. Those will only be on for a fraction of the time, but might consume 1A-2A at 3.3V. The ...
1
vote
2answers
269 views

Supercapacitors in series

Can I charge series of 4 Maxwell BCAP3000 supercapacitors with constant current method using an adjustable Power Supply, and exceed the voltage rated for single cell? What I mean is to charge the ...
0
votes
4answers
198 views

Power green LED from microbial fuel cell (MFC)

I am looking for a way to power green LED (like GNL-3012GD) from MFC which provides 0.2mA @ 0.6V for about 1hr (there should be some drop off period then; 2..3hrs to restore). I understand that the ...
0
votes
0answers
39 views

3.6V battery filtering Capacitor calculation

I am using the follow battery as power supply: http://uk.farnell.com/eve/er26500/battery-lithium-3-6v-c/dp/1973582 The circuit demands a constant current of 0.01 mA until an interrupt happens where ...
-1
votes
2answers
93 views

Charge 5,4V supercap with 12V solar panel

I'm building a circuit to charge a series of two supercap (500F, 2.7V each) with a solar panel (wich outputs, not sc, 18V@1.5A with direct sunlight at 12pm). Those supercap will then power an esp8266 ...
1
vote
2answers
218 views

Calculating the right size for super capacitor

I have a circuit that draws a constant 0.15A and it is powered from a 9V power supply which is immediately stepped down to 3.3V through a linear regulator (LM1117T). My goal is to power the 3.3V ...
-5
votes
1answer
80 views

What type of dielectric materials used to make capacitors/supercapacitors? [closed]

I wonder what type of dielectric materials do the producers use to make capacitors/supercapacitors ?
1
vote
0answers
45 views

Need some advice for a voltage clamp for motor controllers

I'm working on a project that is powered by a 12V 100A PC power supply in line with 5 x 2.7V 350F supercapacitors. There are three 2x30A motor controllers driving wormgear DC motors. The ...
0
votes
4answers
213 views

5s backup by 1F 5.5V Super Capacitor

Can I have about 4 to 5 seconds backup by 1F 5.5V Super Capacitor? Power supply output voltage: 5v 600mA I need 5v 0.5A for my system. I want to use it as ups for only 4 to 5 seconds so I wasn't ...
0
votes
0answers
49 views

NCP3420 failing in buck converter

I designed a constant current buck DC-DC super-cap charger with the NCP3420 as a dual MOSFET driver. The current is hysteresis controlled and the disable and PWM lines are pulled low on power-up. The ...
1
vote
0answers
54 views

Dashboard Camera - How to Fit a Supercapacitor

I do not have a background in electronics. I am using a cheap Chinese sport camera as a dashboard camera – which seems to be a bad idea for the battery started to wear very fast. The battery swollen ...
0
votes
1answer
97 views

Charge a supercapacitor safely using mobile charger

I am not much experienced with electronics. But I am aware that supercapacitors must be charged with lower voltages than rated. I want to make a simple spot welder using this capacitor. I have the ...
1
vote
0answers
118 views

charging Supercap for RTC usage on STM32

Relating to this Thread I have a couple Questions. I want to use the RTC and the Backup-registers of my STM32F413. Therefore I need to supply a Voltage to the VBAT Pin while the Main-supply is off (...
1
vote
1answer
134 views

Supercapacitor Discharging - Strange Behaviour

So i have a bank of Vishay "196 HVC ENYCAP" supercapacitors and I am witnessing strange behaviour when discharging them that I cannot explain. The bank has an equivalent capacitance of 60F. I have ...
-2
votes
2answers
60 views

Supercapacitors as EV batteries

How can we make a supercapacitor bank of 48 V, 8000 F disharge slower when operating an EV motor having following specification: Voltage: 48 Power: 15 kw Type: BLDC/3 ph AC induction Efficiency: upto ...
5
votes
2answers
1k views

Why aren't there any 400V ultracapacitors?

I thought that ulracaps could be better than electrolytic ones for filtering after a bridge rectifier in a compact switching power supply due to their higher energy density. But, for some reason, I ...
1
vote
1answer
312 views

Internal Resistance of a Supercapacitor

I am attempting to replace a wall plug power supply with a supercapacitor. From analysing the behaviour of the wall plug I can see that the current drawn is .25A with 800ms spikes of 1.5A (as ...
2
votes
1answer
111 views

Charge a supercapacitor in 4-20 ma circuit

I want to design a charger circuit in my project. At first I have a ic(AD694) for preduce 4-20 ma current,then must charge one 100F,2.7V supercap. How can do it? I want use a breadboard for this ...
4
votes
3answers
3k 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 ...
-3
votes
1answer
48 views

Find equivalent capacitance [duplicate]

How do i calculate no of caps required to replace a battery. If i am given a voltage of battery and capacity of battery and datasheet of required capacitor
0
votes
1answer
54 views

Are there any chips which manages supercap charging and releasing power?

I'm not looking for recommendations but simply the existence of such a chip, I know where to look for them but want to make sure they do not just exist in my imagination. I want to use a supercap as ...
1
vote
1answer
239 views

Running GSM module from primary batteries (ER34615)

I'm designing a small telemetry system that will take measurements every few hours and send the data through 3G at the end of the day. The target battery life is 1 year. The GSM modules is an XBee 3G....
0
votes
1answer
29 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 ...
-2
votes
2answers
163 views

Super capacitor in UPS system instand of battery

I got an idea to use super capacitors in UPS system like battery replacemant. I have UPS what give me 220V/2000W what use 3 batteries 12V/7,2A. That UPS power whole my office (lights, computers, ...
-1
votes
2answers
134 views

How to efficient use Solar Panel to charge a 12V battery 10Ah?

I have tested my solar panel and i have these values : Conneteced in series produces : Around 136V and 16mA(closed circuit) Connected in parallel produces : Arround 15V and 450mA(closed ...
0
votes
2answers
135 views

super capacitors for dummies! [closed]

What is the consensus on using super capacitors to power a 500w electric bike motor? Cheap and innovative alternative to li-po batteries, or explosion between thighs waiting to happen? The plan is ...
0
votes
3answers
271 views

Can you fully charge a super capacitor at a lower voltage (than its max rating)

Is it possible to fully charge a super capacitor at voltage lower than its listed max rating? Example: could I charge a 5,5V or 6V super capacitor using only 5V. In case it matters, two example super ...
0
votes
2answers
1k views

How to calculate how long a supercap can provide power

What's the formula to calculate how many seconds a supercapacitor can provide power when employing a buck/boost converter? Also, how different would that calculation be when using a pair of supercaps ...
0
votes
1answer
268 views

How should I go about protecting a supercapacitor from reverse polarity?

I have several supercapacitors in series, and they're quite old and probably drifted from their original spec by quite a bit. Completely draining them in series will draw at least one of them below 0v....