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Questions tagged [supercapacitor]

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

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31 views

charge capacitor in two phases

i want to charge two 25F Supercaps (in series) in two stages: while their total voltage is under 5v, i want to charge them slowly via a resistor R3 of around 100 Ohm. After they reach the desired ...
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17 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 - ...
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45 views

Two modes of electrostatic force with charged capacitors?

During a charged state of a capacitor (Regardless of the type of capacitor), Simple parallel plate: .png Parallel plate with dielectric material in the gap: ]3 Supercapacitor: How is the ...
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2answers
67 views

ESP32 powered by supercapacitors

It's been ages since I had to design something electrical so please don't laugh if this is stupid idea but I would like to power ESP32 with super capacitors, just for 30 sec or so so it can finish the ...
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70 views

Transfer of Energy from Initially charged capacitor to uncharged Capacitor

I have started to learn about LC circuits, Specifically, I am simulating a case where the initial conditions are where one large capacitor (100F) has previously been charged to 1.3V, considering the ...
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72 views

Supercapacitor and an applied exterior magnetic field?

I'm curious of the effects of an exterior magnetic field to a Supercapacitor, in both states of charging & discharging. If the Supercap. is placed inside an area where an exterior magnetic field \...
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59 views

Super Capacitor battery replacement, Lead Acid vs Capacitor explosion

I'm considering replacing my lead acid starting batteries on my boat with something like this. 500F @ 16v Starting battery module https://www.maxwell.com/images/documents/ESM_Manual_Install_4_15.pdf ...
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1answer
55 views

Capacitor question - energy from pushing a baby stroller

I’m making a circuit that will be added to a stroller. With a 24 volt DC motor, I’m trying to power the capacitor by walking around & simulating a baby/mother experience and if I run into a hill ...
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99 views

Raspberry Pi Super Capacitor On Battery Loss

I am looking to provide power to my raspberry Pi upon power loss from 5v power supply. It just needs to provide power long enough for the Pi to safely shutdown (with the setup I have, I am estimating ...
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50 views

backup capacitor sizing

I have a question regarding a circuit using a backup capacitor to backup an RTC device. I found that connecting two 0.2 F capacitors in series almost doubles the backup life over connecting on ...
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1answer
119 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 ...
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1answer
48 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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57 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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58 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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61 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
88 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 ...
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4answers
109 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 ...
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1answer
153 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
117 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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105 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 ...
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1answer
295 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
374 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
230 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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52 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
110 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
298 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 ...
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87 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 ...
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1answer
87 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 ...
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4answers
52 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 ...
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3answers
155 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 ...
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1answer
197 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 ...
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150 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 ...
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2answers
150 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 ...
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1answer
141 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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76 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 ...
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1answer
468 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 ...
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2answers
213 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. ...
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2answers
87 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 ...
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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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29 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
654 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
263 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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63 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
187 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
513 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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100 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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77 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 ...
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4answers
902 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 ...