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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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Delay in discharging of the capacitor for sequencing purpose

Our aim is to sequence 2 different power supplies i.e. 5 V and -48 V. On sequence is first "5 V is generated" and then "-48 V is generated" with 120 ms delay. Off sequence is first ...
Sahasra Vaiishnavi's user avatar
0 votes
2 answers
85 views

Unable to generate stable spark discharge

I am trying to generate spark discharge between 2 electrodes with an air gap of ~1mm. I am using the circuit shown here for the discharge. I did see some spark between the 2 electrodes but my diode ...
Chandrashekhar Choudhary's user avatar
6 votes
3 answers
730 views

IGBTs fail after high current, high voltage switch, despite being lower than absolute maximums mentioned in datasheet

I'm using FGH60N60 IGBT as a switch. The circuit is basically a capacitor-discharging circuit. I have a 10 mF capacitor charged to 310 volts and connected to 2 Ω of load via this IGBT (I connect 4 ...
pouya nosratkhah's user avatar
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TP4056 charge discharge for a NiMH prius battery?

I want to make a capacity tester for a 6 cell module for prius batteries. They have 6000mAh new and anywhere from 2500-5000 mAH used. I was wondering if theTP4056 would work for a NiMH battery and if ...
crispYpickle's user avatar
16 votes
2 answers
4k views

Why is my super-capacitor self-discharging so fast?

I'm experimenting with a night light powered by a mini solar panel charging a super-capacitor instead of battery. (I know, I know. It's not recommended for this usage but I want to try it anyway). It ...
eSeverus's user avatar
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1 answer
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Calculate Li-ion discharge time for two different loads, one after the other

Battery: 2S (2 cell), 7.4 V nominal, 3000 mAh, and 8C max. CC LED driver: TPS92691 LED string 1 (in series): I(f) = 1.5 A CC @ V(f) 17 V As simulated through WEBENCH, the input current required at ...
roaibrain's user avatar
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2 answers
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Connecting two Li-ion batteries in series, with different capacity

I'm going to start by saying this is an "emergency", because the delivery of my new battery cells are delayed. I have two 3S Li-ion batteries: one with 2250 mAh (50 C) and the other with ...
Júlio César E. Jr's user avatar
-1 votes
2 answers
81 views

how to choose the optimum discharge resistor?

I was wondering how to choose the value of the dicharging resistor in the figure below: The figure comes from : Figure link SPECIFICATIONS: I'm building a system with fast-switching transistor-based ...
Nedou's user avatar
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6 votes
6 answers
7k views

When discharging a capacitor, why would a resistor make a difference if it is situated after ground?

So I am currently analyzing RC circuits in my textbook, and, just out of curiosity, I conjured up this circuit on Multisim to charge and discharge a capacitor using a SPDT switch. This first circuit (...
polimorphism's user avatar
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1 answer
47 views

Estimating lithium-ion battery run time at different voltages

A polymer lithium battery in a powerbank (marketed as 30,000 mAh / 3.8 V, 114 Wh), has an actual electric capacity of 19,944 mAh, and an energy capacity of 104 Wh as measured with a constant load ...
user3026965's user avatar
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2 answers
91 views

Charging and discharging electro-magnet

I was using normal MOSFET to turn a 1.2 H+4.8 Ω electro magnet at 48 V and draw around 10 A. The MOSFETs are getting damaged after a few days. The MOSFET is just used as a switch (no continuous ...
Jim's user avatar
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1 answer
76 views

Drain a CR4250 battery

I have a CR4250 battery that I need to drain but I don't have a multimeter or any other tools/wire. I've already tried soaking in saltwater for an hour and it still works. I also attached two bobby ...
WonderGirly's user avatar
1 vote
1 answer
117 views

Auxiliary mechanical anti-ESD measures

If a PCBA within a plastic enclosure is prone to malfunctioning due to ESD air discharge in proximity of enclosure seams and openings, but changing the hardware or plastic design is not an option, ...
NoobPointerException's user avatar
1 vote
0 answers
27 views

Battery Pack discharge behaviour

i want to simulate the discharging behaviour of several battery packs/modules connected in series to simulate a discharge machine for a recycling facility. I wanted to simulate possible current/...
ElectricalStudent's user avatar
1 vote
1 answer
87 views

Why are life cycles used as a measure for battery health?

I was curious on how the depth of discharge for batteries affects the battery health as I've heard never to let your phone go down to 0%. I was searching online and every paper I found on this topic ...
import_hill's user avatar
1 vote
1 answer
122 views

Capacitor discharge question

Could I use an incandescent/tungsten AC light bulb to discharge a main 400V capacitor in an SMPS?
Loft Insulation's user avatar
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1 answer
78 views

What role does the resistor play in this circuit?

This is a constant current discharge circuit. What role does the resistor play in this circuit?
jihun's user avatar
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1 vote
0 answers
193 views

Using an RC delay circuit on a MOSFET Gate

I have 24v Input from push button, I want to make delay when I leave the button and the PMOS will stay on for about 0.6sec. Attaching some timing diagram for the required operation signals (pay ...
Knowledge's user avatar
  • 441
2 votes
1 answer
288 views

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 ...
roaibrain's user avatar
  • 407
1 vote
1 answer
179 views

Spark gap breakdown voltage vs gap area

I've been trying to design a 1 MV hydrogen gas spark gap. I found the resistance of such to be in the range of 7 Ω/cm, not suitable for a target 40 kA current. Can I make the spark gap shorter without ...
Alessandro Mini's user avatar
1 vote
1 answer
112 views

Strange capacitor charge / discharge oscillations - SPICE

With this setup ngspice produces, for an 1ms dip-to-zero spike, this output Voltage source pwl(0 15 1m 15 2m 0 3m 0 4m 15 5m 15 2 15) r=0 If I make ...
kellogs's user avatar
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0 votes
2 answers
172 views

Capacitor discharging without a closed circuit

I have a capacitor charging circuit which is connected to a comparator that stops the charging process once the capacitor reaches a certain voltage. The circuit I have built is shown below in Fig 1 ...
RishiC's user avatar
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2 votes
2 answers
386 views

Can you use a charging IC to monitor charge and discharge current (or just charge?)

For my project I would like to incorporate coulomb counting/current measuring so I can calculate the SoC and capacity of batteries. However, I am not sure if you can monitor the charge and discharge ...
Matthew3302's user avatar
1 vote
0 answers
60 views

Help understanding the control circuit of a gas discharge tube

I'm trying to interpret exactly how you get this famous IxU curve of a gas discharge tube you can find on several places, including the Wikipedia page about electric discharge. Image - Original work: ...
user2934303's user avatar
1 vote
1 answer
245 views

BMS vs Charging ICs

Does a BMS and charging IC both do the same functions or is a BMS strictly for monitoring the battery for any anomalies that could lead to a problem? However, doesn't a charging IC do the same thing ...
Matthew3302's user avatar
0 votes
1 answer
296 views

How much time the load would take to drop 1 volt of source battery?

I am trying to figure out how much time a load takes to drop 1 V of the power source. I have a load (vehicle tracker) of 12 V 0.1 A (as per the datasheet) and a car ...
Awais Saeed's user avatar
0 votes
3 answers
705 views

What controls battery discharge? Can you use a transistor to lower the amount of battery capacity used?

What controls battery discharge? I want to be able to save battery capacity by using a transistor to amplify current but don't know how current even would flow from the battery in the first place. Is ...
Matthew3302's user avatar
2 votes
1 answer
113 views

Are lithium-ion battery cells' maximum discharge ratings based on heat?

For any given lithium-ion battery cell, would I be able to discharge more than its rated maximum discharge value provided that it's for a brief time and/or the heat does not rise up and be sustained ...
plu's user avatar
  • 713
2 votes
1 answer
71 views

Setup for discharge speed indicator

I have soldered a negative ion generator. And it has a neon lamp (GT-NE6S1325T) as a discharge speed indicator at the output side. The setup looks like this: The idea is when the capacitor ...
the Hutt's user avatar
  • 149
1 vote
1 answer
70 views

Electrical service discharge path through body

If someone were to accidentally make contact with live service conductors, while touching another person, would I get shocked or would the current travel through me and into the other party without my ...
Dvisionone's user avatar
0 votes
1 answer
886 views

What is the easiest and safest way to discharge a computer power supply?

I have a couple of old computer PSU that I want to take apart to see how much copper is in them. Want to safely discharge them before I do though. Wondering what exactly is the process to do so? I'm ...
Neil Meyer's user avatar
2 votes
4 answers
163 views

What causes an imbalanced battery discharge? Does it indicate a problem?

I've got a project that uses two AAA batteries in series (no center tap.) I've been using eneloop NiMH batteries. It seems like often if I let the system run until the batteries cut out, one is ...
Nick U.'s user avatar
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0 votes
0 answers
95 views

Why does my phone charge/discharge quickly when charged in a car a using cigarette lighter charging adapter?

I have observed that when I charge my phone through a cigarette lighter charging adopter in a car, it charges up quickly and discharges quickly too. The same phone charges and discharges slowly when ...
Awais Saeed's user avatar
1 vote
1 answer
95 views

Using low self-discharge NiMH for a portable power station?

Portable power stations - the large type with AC outlets - typically utilize lithium-ion or lithium iron phosphate (LiFePO4) chemistries. I haven't found any which use NiMH. LiFePO4 batteries are ...
cluelesscoder's user avatar
1 vote
3 answers
361 views

Can a battery be used as a ground to protect yourself from static electricty? [closed]

There are bracelets for protection from static electricity, but you have to touch it to ground to discharge. Can we use a battery (like watch batteries) on this bracelet?
WhoCares's user avatar
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1 vote
1 answer
1k views

Discharging lithium-ion battery

I have a 3.7 V lithium-ion battery, 10000 mAh. Is there any way to discharge it? I do not have a Li-ion battery discharger. Any recommendation about what I could plug in? I tried a firestick thinking ...
BEn's user avatar
  • 25
1 vote
1 answer
45 views

How do I store a Li-ion pouch battery without any discharger or balancer?

I have a single-cell 3.7V 900 mAh Li-ion pouch battery and a 7.4V 30c 2s 850Mah Li-ion pouch battery. I want to store these two batteries (the manufacturer suggests I should store the 2s pack at 3.8V)....
cool bean's user avatar
0 votes
3 answers
569 views

Understanding the RDS(on) of an N-MOSFET

I need to calculate the time for C1 to discharge below 60 V using the following constant current sink if it is initially charged to 565 V (MOSFET's VGS(th): 4 V). At first, I looked at the MOSFET as ...
David's user avatar
  • 41
0 votes
0 answers
67 views

Using an analog switch to charge/discharge a series of capacitors

My circuit requirement is very low power consumption to allow/disallow voltage (V1 which is variable 0-5 V) to go through some capacitors (cap1 and cap2) by controlling analog switches (DG2535EDQ) ...
Aalsubhi's user avatar
3 votes
1 answer
68 views

Is battery self-discharge cumulative with discharge from use?

Imagine a battery with a self-discharge rate of X. If I hook it up to a circuit that draws Y, is the battery draining at ...
asgallant's user avatar
  • 133
1 vote
1 answer
117 views

Synchronization of two RLC circuits

simulate this circuit – Schematic created using CircuitLab Suppose x amperes passes through the resistor R in circuit 1. Now if both switches in circuit 2 are turned on in synchronized manner, ...
Muhammad Muzammil Nawaz's user avatar
1 vote
1 answer
126 views

Discharging 2 capacitors in synchronized manner in a resistor

Let suppose a single capacitor when discharged through a resistor via switch gives you "x" current. Now if I attach another set of switch and capacitor across that resistor and turn on both ...
Muhammad Muzammil Nawaz's user avatar
0 votes
0 answers
52 views

Li-po battery reported voltage has deviations. Why?

The chart below is a 4 hour logging of a 3500 mAh Li-po battery voltage (no charging - powering up a Raspberry Pi Zero W). The charging board uses BQ24160 chip to read the BAT voltage. I use 3200~4200 ...
BHP's user avatar
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0 votes
0 answers
154 views

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 ...
Peter Stoneham's user avatar
0 votes
0 answers
55 views

How do we increase the c-rate (discharge rate) of any electrical system?

I have limited understanding of electricity and electronics in general. I know Ohm's law; V=IR, which to me means current depends on voltage and resistance. So let's say if I want to draw more current ...
Shailesh Joshi's user avatar
8 votes
5 answers
2k views

What is the point of a high discharge rate Li-ion battery if the wire gauge is too low?

On my "50C" 3300mAh Li-ion battery, the wire gauge is only 10 (30 amps max) while the calculated max current draw is 50 * 3.3 = 165 amps. So if the realistic max amp draw is only 30 amps, ...
luek baja's user avatar
  • 269
0 votes
0 answers
38 views

Battery capacity evaluation

To measure NiMH battery capacity, everything I've read so far indicates that in order to get an accurate evaluation you have to measure the discharge parameters. I can understand that, however in my ...
Philip Grimado's user avatar
0 votes
4 answers
210 views

How much does it take to discharge a capacitor in the vacuum? [closed]

We have charged a capacitor with a specified voltage. Between the capacitor's plate, we have vacuum. So how does this capacitor can be discharged if we place this capacitor in the vacuum? As you can ...
mohammad rezza's user avatar
0 votes
2 answers
1k views

Design of 13.56MHz RF generator circuit for driving capacitively coupled plasma

As the title suggests I've set out to design a modestly (300W?) powered RF generator for driving a plasma reactor. Despite wanting to think my RF knowledge is good enough, the past week I spent ...
dan dan's user avatar
  • 13
0 votes
0 answers
99 views

Coil abrupt discharge BEMF amplitude

My goal it to understand and attain the highest voltage possible for an amateur experiment. Can't find specs on BEMF properties, only that it's a "dangerous spike" on the instant a switch ...
juanmf's user avatar
  • 135

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