Questions tagged [supercapacitor]
Very high energy-density capacitors, typically measured in farads.
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Charging a super cap with a Li-po battery while maintaining charge
I have a 3 V 100 F capacitor and 400 mAh 35 C battery, the battery is to be charging the super capacitor and maintaining charge until a button is pressed to discharge the super cap. I am stuck with ...
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Designing boost converter for a supercapacitor source and LED load
I have a 2.7 V 100 F supercap, that would equal 364.50 J of energy based on E = 1/2CV^2. If my load is a series of 4 LEDs with a stack forward voltage of 12 V and forward current of 3 A that would ...
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SuperCapacitor Charger with BQ25173
I am asking about supercapacitor charger with BQ25173 IC. I examined the datasheet and designed my circuit for about 13 mA, but when I built the circuit, the current that was needed to charge the ...
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Super capacitor causing overcurrent protection
I'm making a power-supply circuit for some MCUs using a battery charging-discharging protect module MH-CD42 (both input and output is 5 V).
The module's datasheet says it has a 0.3 seconds switch time ...
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Leakage current in supercapacitors stack
Given a circuit of four hybrid supercapacitors in series, connected in parallel with another branch of supercaps in series (4s, 2p), where the leakage current is illustrated as a parallel resistance ...
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Using capacitor bank in parallel with lead acid battery
I saw some DIY projects about boosting car lead acid batteries. A supercapacitor bank is connected in parallel with a lead acid battery to stabilize the supply.
However, in the market, I can only find ...
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How can I simulate a super capacitor in LTspice?
I am trying to simulate a super capacitor in LTspice but it is not giving me the correct discharge time as it should be theoretically.
Has anyone also faced this issue? Please let me know how to ...
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Supercapacitor to prevent temporary power supply voids
Hello and sorry for the improper title!
We need to transmit about 50 W (5 V 10 A) through a slip-ring-ish to drive some rotating electronics and LEDs.
We are using a 5 V 25 A LED power supply.
We are ...
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Is there any supercapacitor that is hermetically sealed?
Does high altitude affect supercapacitors?
At high altitudes mostly hermetically sealed capacitors are used, so is there any supercapacitor that is hermetically sealed?
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Super capacitor charging circuit
I am trying to build a circuit to power a system for about 30s-1min after we have a power loss (12V going off), so my microcontroller and radio transmitter can send a message alerting the power loss.
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USB inrush current limiting, charging super capacitor
I am trying to charge a supercap over USB. I understand I need to limit the current (ref: usb.org)
This has been discussed a lot here, for example: here and here, but I believe my requirements are a ...
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Help with power buffer using capacitors
Looking for some help on how I might be able to add a power buffer of around 1 hour to an IC using super-capacitors, and be able to recharge it within 5~15 minutes after a power disconnect.
Looked ...
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How does balancing via resistors work? Why isn't it needed inside of batteries?
I am building a hobby project - a sort of supercapacitor powerbank, where I basically connected twelve 500F 2.7V supercapacitors in series. Despite these capacitors being from same manufacturer and ...
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Can I use a large capacitor to boost the current of a circuit for a short period?
I'm working on an RPi-Pico (Adafruit Feather RP2040) project that runs off of computer USB power (5V/500mA-1A).
I need to simultaneously move 3 motors that run at 6V-8V/250mA, but only for ...
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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 ...
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Is LT8705 a suitable and easy hands on DC/DC converter for controlling charging and discharging supercapacitor in HESS?
Currently working on a hybridise my agv which is powered by a 11.1V, 3000mAh LiPo to drives two 12V DC motors. My idea is making a semi-active HESS where only a DC/DC converter is used and connected ...
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Using super capacitor with Li-ion battery to power an automated guided vehicle
I have an automated guided vehicle which is powering by a 11.1V, 25C, 6000mAh Li-ion battery. The reason I am attempting to make a hybrid power source to power the automated guided vehicle is to ...
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Super capacitor, water pump [closed]
I want to design a circuit which can store energy from a little 6 V solar panel into a super capacitor and when it reaches a certain amount of voltage (or gets full) , with a steep start , it ...
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Nominal voltage of supercap
Is it possible to replace a supercap e.g. an FCS0V224ZFTBR24 which is a 3.5 V type by its equivalent with a higher voltage (5.5 V), the FCS0H224ZFTBR24? The datasheet of both types is here.
What will ...
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Super capacitor discharge protection
We are developing an active RF timing tag which uses a 3 V 20 F super capacitor as a power source. We will charge the tag at the time of registering a participant. The charge time should be as short ...
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What can cause a capacitor/supercapacitor to not charge up to source?
I'm doing a project that involves charging an experimental supercapacitor with a 9 volt battery and then turning a red LED on with it.
Now, I've asked around what determines to what voltage a ...
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Capacitor bank for delayed solenoid closure
I have a 24 VDC solenoid valve plumbed in line with a 24 VDC motorized ball valve transporting water. These are redundant because it is critical not to have a valve fail and cause an overfill event.
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Any thoughts on a supercapacitor battery project?
Just some insight: I am fifteen and have been researching capacitors for a while now.
I have come up with the idea of building a supercapacitor power supply unit solely to power some small electronics ...
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Automatic buck-boost DC-DC 1-15 V to 5 V, 5 A
I've a big 3000 F 6 x supercapacitors bank to work as an aux USB power hub. It gives power while linearly losing voltage to 5 V, then it stops working, because I'm using a 5-15 V to 5 V DC/DC ...
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Powering ESP32 and two MG90S using supercapacitor
I'm working on a drone-dart project.
Dart is controlled by an ESP32CAM and two MG90S servo motors. It is raised to the sky by a drone and then released. The dart falls while attempting to aim itself ...
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AC to DC 6 V for bicycle and super capacitors for lights
I’m trying to design a circuit to enable my bicycle lights and also have at least 2 minutes of standing lights coming from a bicycle 6 V AC hub.
I thought about building a rectifier bridge with 4 ...
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Help with supercapacitor charging circuit
I need to design a circuit to charge a capacitor from 0 to 2V. The circuit should not be that complicated and no matter the type of capacitor, it should never exceed 2.7 V when charging. The capacitor ...
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NiCd vs supercapacitor in high-current discharge
I'm going to build a drone project (no lead batteries) that will only run for 1-2 minutes, but probably at low temperatures (30C-60C C-rate and sometimes -20°C,) so I will need a nickel-cadmium ...
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How does this supercapacitor over-voltage protection work?
I'm designing a capacitor discharge battery spot welder and came across this video on over-voltage protection for supercapacitors. How does the schematic shown at time 10:15 work? If I need to connect ...
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Is the overvoltage protection used in this circuit a normal way of doing it?
The circuit is from a clip on YouTube. VCC is from a stepper motor generator and varies between ~0-30 volts DC.
From what I understand, and please correct me if I am wrong, when the voltage gets too ...
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Inverse temporal power-law increase of DC voltage under the application of constant DC current
Is there any material in which the DC voltage follows an inverse temporal power-law increase, under the action of a constant DC current? This implies a situation in which a constant current, I, is the ...
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Is this device claiming to reduce electricity bill a scam? [closed]
I saw something on the net and I have no doubt that it is a scam. This advertises as 90% reduction of electricity bill in a houshold.
I have no idea what it does. From the looks of it it is just a ...
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Latching solenoid supply circuit / control
I have done DC motor control with an H-bridge circuit before. I used a 3.6 V, 9000 mAh (ERC26500) battery and had no problems.
Now I want to use a latching solenoid and I need 7.2 V for that, so I ...
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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 ...
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How to spec a power supply for capacitor charging given the simulation and large requirements?
I am using the LT3751 as a capacitor charger for a large capacitor (30mF) and am trying to get an idea of the kind of power supply I would require in order to come close to the simulation charge time. ...
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Wont the 6v charging voltage destroy the 3.8v super capacitor in this circuit sculpture?
I'm impressed with the circuit sculpture given at following link and want to build one for myself.
https://www.bhoite.com/sculptures/tiny-cube-sat/
For circuit diagram pls see this https://www.bhoite....
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Charging supercapacitors with reversed polarity
I bought six supercapacitors and connected them in series to get a total voltage of 16.2 VDC.
The product's Mouser No is: 723-BCAP0450P270S18, Mfr. No is: BCAP0450 P270 S18, the datasheet can be found ...
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Boost converting 0.5V PV output to charge a super capacitor
I want to charge three 2.5V 700F super capacitors in series (7.5V total) to a precise 6V so that I avoid overcharging a single capacitor in the string. (Conservative 80% voltage to avoid having to ...
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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 ...
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Using capacitors as a battery back-up
I have a device which is operated from a 12 VDC 10 A power supply and draws 8 A in operation.
I need to run this device for at least 20 seconds when the 12 V power supply is lost upon a power failure. ...
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Simple supercapacitor fast charging circuit
I have some 2.7 V, 500 F supercapacitors and I would like to quickly charge them from two 18650 VTC6s in parallel.
I made this simple circuit and I would like to make sure it works before I build it.
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Is it possible to charge a large 30,000uF capacitor to 250V in 5 seconds?
The energy of the capacitor would be E = (1/2)CV^2 = (1/2) * (30000 * (10^-6)) * (250^2) = 937.5 J
That would be 937.5 J / 5s = 187.5 W
If I had a 12V power supply then the current would be 187.5W / ...
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Why conductor having charge(let say 1C) have tremendous potential but same conductor used in capacitor have low voltage?
When we talk about electrolytic capacitors or the supercapacitor(EDLC) then we know that, we can store large amount of charges in it. Since in electrolytic capacitors Aluminum plate acts as cathode ...
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Is it safe to add a big capacitor in parallel to a power supply output?
I have an application which uses a 1000W standard PC power supply, drawing continuously around 300W. However, sometimes there are short power surges of ~800W or more, which I believe triggers the ...
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Super-capacitors to heat resistive wire
I am looking for help/insight into the feasibility of using the stored energy in supercaps to heat a short length of nichrome wire, or a vape coil.
I have nichrome wire that is 0.040 size, at 0.408 ...
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Feasibility of obtaining a 210µF 4.5kV DC capacitor?
I'm looking for a high-capacitance, high-voltage capacitor for a experiment I'm interested in trying out (i.e. order of 100µF rated for at least 4.5kV DC). I realise these specifications may be ...
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Component protection and charge optimisation for Solar + Supercapacitors
What are the best protective practices for solar cells and supercapacitors when they are used for small outdoor projects? Moreover, are there any way of widening the useable voltage output range of a ...
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How to interpret the “surface power density” of a battery/capacitor
I’ve come across this research and one point of representing a power output confuses me:
This enzymatic fuel cell is based on non-immobilized enzymes that exhibit a maximum power output of 0.8 mW cm−...
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Voltage (or power)-current relation of a small supercapacitor
Is size a factor that limits the maximal current that a capacitor can take?
I got this question when seeing Figure 7 of this supplementary material of the research of the smallest super-capacitor now. ...
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Making a DC to AC converter at home
My idea was to build a DC to AC converter, and I want to make sure it's feasible:
simulate this circuit – Schematic created using CircuitLab
A supercapacitor has very low voltage operating ...
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