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Questions tagged [discharge]

The process of removing energy from a store, such as a capacitor or battery. Stores may be parasitic, resulting in rapid spontaneous accidental discharge, as in a static shock.

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What happens to the energy stored in a short-circuited capacitor?

Suppose we have an ideal capacitor with a certain voltage between its plates. We connect the two plates using an ideal (lossless) wire, so the capacitor discharges. Where has the energy having been ...
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1answer
22 views

LTSpice - Capacitor Charging/Discharging Circuit not working right

I am trying to do a charging and a discharging Circuit. R8 is the load that Capacitor C1 needs to discharge into when P12V_IN is low. My question is Why is Vsolenoid low in the interval shown on the ...
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1answer
26 views

LTC 4150 coulomb counter property

I want to monitor the capacity of a 7.4V, 2200mAH Li-ion battery. I have found a that LTC4150 coulomb counter can able to measure the battery capacity. So, suppose I have connected a fully charged ...
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3answers
825 views

Discharge time of 12 V 8.4 Ah at 5 mA

I have a motorcycle battery rated as 8.4 Ah (20 HR). It also says 8 Ah (10 HR) and I am not sure what the difference is. Anyway, I have a GPS tracker fitted with a rated ...
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3answers
58 views

Corona discharge insulation

If a wire is insulated from arcing up to 10 kilovolts, is it insulated up to twice that much from corona discharge? Because I’m imaging that for corona discharge to occur, the electricity has to flow ...
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3answers
58 views

Can I put Li-ion batteries in series and discharge them at different voltages?

I need to run a pump (drawing 95mA at peak flowrate) at +14V and the rest of my circuit runs on +3.3V. To save on battery costs, I was thinking of purchasing four 18650s at 3.6V 3500mAh per cell and ...
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3answers
238 views

In the recent Con-Ed transformer “fire”, what exactly produced the color of the huge blue glow over New York City?

Blue is often linked with technology (e.g. "big blue", glowing pools of water with Cherenkov radiation, aliens in general, Nobel prizes for blue LEDs) as well as traditional things like sparks. In a ...
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2answers
899 views

Shorting a high voltage electrolytic - damaging?

I have a high voltage (400V) electrolytic capacitor, and I sometimes discharge it by shorting the terminals with a screwdriver. I get a fat spark and a bang. However, apart from minor damage to the ...
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1answer
23 views

Depletion Mosfet as current source to power load

I came acros the following application note for a Depletion Mosfet (https://www.infineon.com/dgdl/Infineon-Application_Note_Applications_for_Depletion_MOSFETs-AN-v01_00-EN.pdf) and i got intrigued. ...
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1answer
59 views

Does voltage drop with discharge?

Does voltage drop with discharge? Since voltage is the potentiality between two charges to re-balance (from my understanding). I mean, once all charges are equally shared between both capacitor ...
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1answer
37 views

Selecting the Power rating of resistor

In a circuit I design, there is a moment, when a capacitor should be discharged through a resistor. The power dissipated in the resistor has the format of the screenshot in the LTspice. Should I ...
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1answer
45 views

Question about a high voltage setup/scenario

I was wondering what would occur in the following setup. Say you have an circuit basically like this: V1 is a source of high voltage (high enough for corona discharge to occur), and no current can ...
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2answers
476 views

Is Non-Passive Cooling bad for Lithium Ion Cells?

I'm in the process of designing a device capable of charging, discharging and testing internal resistance of 18650 cells. My device will be capable of testing 100x 18650 at the same time, each will ...
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2answers
94 views

What if the current draw is greater than the rated discharge of a battery?

I have a 48 volt, 20 kW motor that I need to supply with power. I am looking at a configuration of 16 LiFePo4 cells each in series, each 200 Ah rated at 1 C. At that rated capacity, it would seem ...
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1answer
71 views

12 volt 8000 watt battery discharge protection

We built a home in a country where electricity is a rare ressource. In order to have energy available all day we bought a bunch of solar panels and several 12 volt batteries. We then used a 8000 watt ...
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1answer
166 views

Why Peukert's law is always ignored in battery(lead Acid) guides available on Internet?

I am doing battery calculations for off-grid solar panel. I don't get that why battery guides on Internet always ignore Peukert's Law for batteries of solar panel. I want to have good approximations ...
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1answer
67 views

Determine the voltage drops across the capacitor

I am having troubles with one type of tasks when preparing for an exam. I think I get the way to solve it when t = 0, but I don't really know what my approach should be when t>0. Task: That is how ...
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2answers
198 views

Maximum discharge rate of coin cell batteries

I am trying to figure out the maximum current I can pull from different battery types. Cursory research suggests this isn't a commonly reported values, maybe it is close enough to the capacity such ...
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1answer
36 views

How does this circuit works for detection of Logic low, Logic High and Hi-Impedance state?

I was working on a design of Li-ion battery charger using LTC4001. Here a pin is called CHRG, which indicates the different state of charging like charging cycle begins, threshold reach(i.e 4.2V or C/...
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0answers
22 views

Discharging mixed gas / Ionization potential

When I discharge a mixture of gas, I didn't see whole peaks about N2(But I saw some parts). (The gas were H2 and N2) So I suppose that with ionization potential. But I'm not sure of it. So I'd like ...
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1answer
38 views

Trying to solve a RL circuit by hand but simulator calculates a value I do not understand

I have this circuit. V3 is just a trigger to close the switch, just ignore it. The switch is open for a long time. So, the left part of the circuit is working for a long time and the inductor is ...
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3answers
154 views

Low power switch input with MCU wake-from-sleep interrupt?

Im trying to read the falling edge of digital logic input to wake up a microcontroller. Below is the circuit I have used. There is an RC filter to provide a ~5ms debounce time, and a 100K pullup so ...
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2answers
64 views

LEDs + Constant Current Driver - Discharging the Circuit

I have a project where I made a series of high power Osram OSLON blue leds using custom boards on aluminium PCB. I just put 16 LEDs in series and joined them to an appropriate constant current supply. ...
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4answers
220 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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1answer
112 views

18650 cells - Unable to measure capacity

I got many 18650 batteries from notebook batteries and I want to test their capacity by my Turnigy Accucell 8. My problem is, that when I start discharge program (0.5A what is from battery datasheet) ...
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2answers
108 views

18650 discharge protection

I've converted an existing 18v DC battery pack (for a power tool) to use replaceable 18650 cells. My plan is to charge the cells in a "smart charger" and discard the OEM charger. I'm only getting ...
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1answer
133 views

Max Discharge Rate of typical Alkaline Button Cell Batteries

I have simple circuit that has some led diodes, 3 LR41 batteries and no resistor. By looking at this website, it seems their capacity is about 30mAh. But I couldn't find anywhere the max discharge ...
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0answers
51 views

Designing a Lipo Charger for 1 or 2A charge, 5A discharge

I'm looking for/designing a Lipo charger which can handle a discharging current of 5A at 5V. Obviously, the lipo's charge is 3.7V (max 4.2V, min 3.2V), so most charging circuits inside a power bank, ...
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2answers
126 views

Can a capacitor charge and discharge at the same time?

Is it possible to use the stored energy while the capacitor is being charged? In other words, use a capacitor almost as a conductor? My gut says the answer is probably no (and my own experiments so ...
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2answers
54 views

What's the current leak path of the electrostatic discharge during an EMC test?

When we develop a new product we need to pass the EMC test,I really wonder what's the current path during a electrostatic discharge test. Here is the test situation: Q1: If the EUT(equipment under ...
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3answers
48 views

9 (7.4v) Li-ion rechargeable battery maximium drain current?

Battery such like these: https://www.amazon.com/gp/product/B078JMHHF8/ref=ask_ql_qh_dp_hza I found no official information about continuous discharge rate. Li-ion should have a large discharge rate (...
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2answers
177 views

Can mosfets discharge power capacitors? [closed]

I want to know what Pulsed Drain Current has to do with discharging energy storage devices. What does a mosfet need to have in order to be capable to discharge a cap? How do I determine a rate of ...
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2answers
60 views

Can a semiconductor device discharge power capacitors

Trying to figure out how to discharge a capacitor yielding 75 Joule - 177v @ 4700uf. I am uncertain which or even if a semiconductor device is up to the task. Can semis do it? If yes then which can do ...
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3answers
83 views

Why equation 22 is subtracting the current rather than adding?

Both the currents are going into resistors and should add to the voltage across resistors, hence the voltage across capacitor ?
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1answer
230 views

How to discharge a capacitor being charge by an op-amp?

I've only shown a very small part of the circuit (if the rest of the circuit matters I can show the rest - diodes are used to maintain the charge acorss the capacitor). Background: The capacitor is ...
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3answers
817 views

How do I figure out max continuous discharging current of a battery?

Looking into ordering a battery for a prototype I'm working on. The power rating for my product requires 4610.6mah to power it for 1 hour and I'm looking for a battery that can support its run-time ...
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1answer
55 views

Will dumping capacitor power into a coil cause overheating [closed]

I have a cap 450Vdc @ 480uF if will a 1Ω coil become significantly hot (well above 25°c) if I discharge the cap from 100% to ~0% 3x / second into the coil? If not then what would be theoretical ...
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1answer
59 views

Lithium Ion voltage during discharge

I'm trying to understand how lithium ion batteries work during discharge, looking at the following batteries https://www.nkon.nl/sk/k/hg2.pdf. My question is how do you determine the current voltage ...
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4answers
301 views

RC Delay Ciruit for Pi power on

I am a bit electronically challenged and need to hold an input pin high for about 8-10 seconds. I am implementing this solution: https://github.com/NeonHorizon/lipopi/blob/master/README....
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0answers
46 views

12v parallel 24v same battery unequal charge?

Two batteries same everything. Need to be out by low tide this morning. But I'm not sure if I have enough time to fully charge both. Standard 40amp circuit for trolling motor. But I need to beat the ...
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2answers
126 views

Constant Power Micro Load

I am trying to make a circuit that slowly discharges a multi cell lithium battery to storage voltage. I already have a comparator circuit that can turn on or off discharging. I want to support 2s to ...
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1answer
109 views

Emitter Follower Power Stage of an Amplifier with Switch-off capacitor

I know exactly how emitter follower (EF) arrangement of transistors works (when used as power current amplifying stage). But according to my book (G. Randy Slone: High Power Audio Amplifier ...
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3answers
303 views

How synchronous buck converters continue to operate in light load conditions

simulate this circuit – Schematic created using CircuitLab For all intents and purposes lets assume this basic power stage of a synchronous buck design above. Let's also assume a steady state ...
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2answers
54 views

How can I increase the number of USB outputs of a powerbank which only has one output? [closed]

I'm talking about outputs which we use to charge our devices with. Would using USB male to two USB female cord be a bad idea?
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1answer
142 views

What is a safe way to carry around (wrt ESD safety) a single-board computer in an enclosure like this? [closed]

I have a single-board computer and an enclosure, which will hopefully look like this in the end: I have three small questions: If I only hold it from the edges while assembling the enclosure, do I ...
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1answer
67 views

How to excite a fluorescent lamp without connecting it?

I'm a newbie in electrical engineering, so this might be a silly question. But are there any standard ways to create an electric field over a volume of air, strong enough to excite a compact ...
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2answers
1k views

Smoothing a Full-Wave rectifier voltage

I was reading about full-wave rectifiers and came across the schematics below which the capacitor C can smooth its voltage, but I didn't understand one case: We know that when the rectifier's voltage ...
2
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1answer
80 views

Minimum load current from charger IC

In my current project setup I have a Li-Ion charger IC (the BQ25890 from TI) which manages the battery charging and discharging process. The charger IC has to power an ATmega328PB. The ATmega in turn ...
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1answer
332 views

Using a voltage supervisor IC to protect a Li-Ion battery from undervoltage >2.8V?

Sorry if this has already been asked, I tried searching but might not have the right vocabulary. I'm starting to use lithium-ion batteries to power projects, and I've wound up with some 18650 cells. ...
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1answer
158 views

Li-Ion charger IC leakage current confusion

I'm currently building a Li-Ion battery charging circuit which has a 5V/2A input. It should implement load-sharing in order to keep the output alive during charging. For charging, I found the ...