# 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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48 views

### 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 ...
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### 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 ...
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 ...
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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 ...
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 ...
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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 ...
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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 ...
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 ...
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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 (...
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### 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 ...
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### 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 ...
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### 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 ...
1 vote
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, ...
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### 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/...
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### 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 ...
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### Capacitor discharge question

Could I use an incandescent/tungsten AC light bulb to discharge a main 400V capacitor in an SMPS?
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### 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?
1 vote
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 ...
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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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### 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 ...
1 vote
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 ...
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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 ...
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### 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 ...
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### 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: ...
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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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
1 vote
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### 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 ...
1 vote
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### 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?
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### 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 ...
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### 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)....
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 ...
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### 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) ...
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### 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 ...
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1 vote
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### 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, ...
1 vote
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### 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 ...
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### 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 ...
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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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### 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 ...
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, ...
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### 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 ...
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### 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 ...
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### 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 ...
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