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Questions tagged [supercapacitor]

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

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1answer
116 views

Capacitors in parallel going negative

Interesting (maybe?) question here which I am struggling to answer. Hoping someone can help. I have a capacitor network; 5 caps in parallel and then two modules of that configuration connected in ...
-1
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0answers
33 views

Applying voltage on Super capacitor Balancing Board (6 x 2.7V)

All, My question relates to balancing boards commercially available for supercapacitors (6 strip) and whether they are typically designed to handle slightly higher voltages. I know that the active ...
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1answer
37 views

Back up power supply for microcontroller and servos

I currently have a simple circuit which lets me control a servo using an arduino and have everything working, but I need the servo to go back to the default position in the event of a power failure, ...
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0answers
53 views

I'm an undergrad building a railgun and I need assistance!

I am a physics undergrad that chose his senior project to build a low voltage railgun, however I am running into a few different issues. 1.) The paper mentions a "flyback diode bank" which I have ...
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0answers
44 views

Design Vbat system with PMOS to keep RTC

Since I'm using an MCU without internal Vbat system (STM32L0 series), I've read the "How to design a Vbat on STM32L0/L1 series" from STMicroelectronics to keep the internal RTC. I would like to ...
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1answer
58 views

Supercapacitor for Wind Energy

I am building this wind turbine project and the problem I am facing is the irregular winds that does not keep the inverters running continuously. I initially decided to solve this problem by employing ...
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1answer
65 views

Connecting a super capacitor to the solar battery in parallel

I find some people connect a super capacitor like (16v 88F capacitor bank) in parallel with the 12v 100Ah solar battery to optimize the surge current draws from the battery due to running heavy ...
0
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4answers
81 views

Supercapacitor backup circuit - why seperate charge and discharge path?

I am learning about super capacitors in a backup power application. I see a lot of examples using diode networks or FETs to separate the charge and discharge paths. Why is there so much effort put ...
5
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1answer
132 views

What might be causing an op amp to fail in a voltage follower circuit?

I have the following super simple op amp circuit that makes use of the AZV321 single op amp (https://www.diodes.com/assets/Datasheets/AZV321.pdf) in order to balance the voltage on a pair of ...
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4answers
110 views

Capacitor bank as a constant current source?

Can a capacitor bank of high power density, be integrated to a circuit such that it acts as a constant current source to a load? Even for a short duration of time.
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1answer
100 views

What can I use to turn on a circuit at 5V?

I'd like to power an Arduino using a supercapacitor. I already have that part of the circuit figured out. But I want to charge the supercapacitor using an external power source, without the ...
2
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1answer
165 views

Minimalistic RTC backup battery charging or a super-capacitor?

I am trying to provide RTC power backup for a 3.3V system that will be running at the very least 8hrs during the work day. As such I only need up to a month of backup, enough to survive over long ...
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2answers
77 views

The output of a boost converter doesn't stay at 5 V

Let me start by apologizing for my english in advance :) I'm trying to build an UPS for my raspberry Pi (even though I have basically zero experience in electronics). When the power cuts out, I want ...
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4answers
243 views

Ultracapacitors as a battery; how long will they last?

I would like a formula to be able to calculate how long it would take 6 2.7v 350f ultracapacitors connected in series to degrade from 14.4 volts to 11.5 volts given a parasitic draw of a specific load....
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1answer
194 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 ...
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0answers
51 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 ...
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1answer
93 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 ...
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1answer
224 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
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1answer
81 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
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1answer
85 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
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4answers
51 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
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3answers
132 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
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1answer
154 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 ...
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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
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1answer
128 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
146 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
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1answer
115 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 ...
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2answers
75 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
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1answer
331 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
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2answers
190 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
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2answers
78 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
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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 ...
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1answer
28 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 ...
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2answers
499 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 ...
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4answers
246 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 ...
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0answers
60 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 ...
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2answers
149 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 ...
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2answers
405 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 ...
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1answer
97 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 ?
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0answers
69 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
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4answers
630 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 ...
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0answers
73 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 ...
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0answers
57 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
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1answer
101 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 ...
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0answers
230 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 (...
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1answer
145 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 ...
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2answers
68 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
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2answers
2k 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 ...
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1answer
487 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
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1answer
124 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 ...