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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45 views

Does load resistor value in constant current setup affect power delivered from source/battery?

I am bulding a battery pack of 48v using 18650 cells salvaged from laptop batteries. I have to test them for their capacity to use in my project of converting bycycle to electric. So i have couple of ...
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28 views

Vehicle battery (NMC) max discharge rate

I wanted to understand a few things related to secondary batteries:- Do the secondary batteries not have any limit on how much current we can draw from them? a. I understand that we have a limit on ...
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Li-ion charge / discharge circuit with ESP32 and MOSFET

Here is what I’d like to do: Wire a circuit that can either charge or discharge a single li-ion cell (3.0 to 4.2 V) or just do nothing at all. An ESP32 controls the circuit (max. 3.3 V). An INA219 ...
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RTC circuit supercapacitor charge/discharge doubts

This is my current RTC circuit... Supercapacitor = DXJ-5R5V334U (ELNA)... DXJ-5R5V334U = 0.33F, 5.5V, ESR = 150 Ohms Resistor = 150 ohms 0603 100mW 1% If I consider only the resistor, I have a RC ...
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Modeling the discharge efficency of grid connected energy storage systems

Short form A battery has a charge and discharge efficiency of \$95\$%. The initial SoC is \$3 \text{ MWh}\$. It charges for an hour with \$1 \text{ MW}\$, then discharges for an hour with \$1 \text{ ...
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33 views

can I charge battery at the same time as using it if it is the new usb c pd

Sorry for such a newbie question. I am still trying to find my feet. I know that a battery cannot be charge and discharge at the same time as I find this: No, a battery can't be charged and ...
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52 views

Observations with Ni-cd and Li-ion discharge and voltage curves

I was going to get a set of NiCd batteries for the driving motors of my robot. A friend told me that nicd’s discharge current decreased during its runtime and that Li-ion might be a better choice, ...
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55 views

Gas discharge tube load type

I can not find any information about the type of load of neon lamps, for example neon probe or wall contact plug or extension cord with switch with small red lamp. I think this is a passive capacitive ...
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34 views

Measuring Discharge Rate of LiPo battery

I am attempting to change the temperature that a 3.7v rechargeable LiPo Battery is discharged in and am seeing how this affects the capacity and discharge rate of the battery. My setup currently uses ...
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48 views

How do I safely discharge this Trinitron CRT when the HV connector seems glued on?

I'm trying to discharge a Sony PVM-1353MD which suffered shipping damage. Unfortunately, I am unable to get my tool under the HV connector. It seems bonded to the CRT with some kind of white silicone ...
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Discharging 18650 at higher Peak-Amperage than rated max continuous Amperage?

I am using Sanyo NCR18650BL cells. They are rated for 7A max continuous discharge, but i could not find any info on temporarily discharging them at a higher rate (for example 10A per cell). Is it ...
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Is there a relation between the voltage of a Li-ion battery and its charge?

I have a Li-Ion battery-powered device (Wemos, an ESP8266 based) and I can read information about the voltage applied to its input. Is there a relation between this voltage and its remaining charge?
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43 views

What electrode material can I use for electrical discharge machining? [closed]

Can I use an electrode made of melted soldering wire in electrical discharge machining (EDM) instead of copper or graphite? I think it is very easy for me to make electrode by using melted soldering ...
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44 views

How does the continuous/peak charge/discharge current change when combining cells with known values in series / parallel arrangements?

Example 16 identical battery cells rated as below: 3.2V 100Ah LiFePO4 Max Continuous Discharge 100A / 1C Max Peak Discharge 200A / 2C for 100s Max Continuous Charge 50A / 0.5C Max Peak Charge 100A / ...
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51 views

Time interval quantized?

We have a capacitor fully charged with some voltage. At t=0 we can find the current. This current will change the voltage of the capacitor. However the information of the change of the voltage of the ...
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73 views

Finding practical solutions for discharging and charging a capacitor

I am wondering can I charge and discharge a supercapacitor at the same time like a battery. I have 1.3V going into a 10F 2.7V capacitor in series with a 0.5 ohm resistor. I calculated it will take ...
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53 views

max Discharge current of li-ion battery (temporary)

Is my assumption correct that the main limiting factor of maximum discharge current of a Li-ion battery is that the cell heats up too much due to its internal resistance/the current flowing through ...
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63 views

Pull away voltage (energy) from a DC motor driver board when it does regenerative braking

I have 200 BLDC motor (six-step) driver boards. They work fairly well but, when I tested them on a heavy load (2500 kg), I discovered that they struggle when braking the motor. The PID algorithm can ...
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34 views

How do I conduct an experiment to find the discharge curve of a lithium ion battery?

I want to conduct this experiment with a multimeter only. What sort of load do I put? I used a Sony Li-ion Np-BPL battery model and after full charge, I put the battery across a load of 1k Ohm; ...
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100 views

What is the purpose of this coil in a medical defibrillator?

Please can someone explain the function of L coil in this circuit? This schematic is just medical defibrillator, but almost every capacitor discharge circuit has some series coil. Is it some kind ...
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56 views

Calculating capacitor discharge time constant with dc source and constant current source

I have a 1.8V dc source with 40 ohms series resistance, which models a battery. In parallel, there is a 10uF capacitor. At t<0, the mosfet is off and there is no load delivered to the output, so ...
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27 views

Voltage monitor when discharging

I am trying to make a discharge system that use 2R2 resistors and relay to engage the system, until here everything is fine, I can trigger the system and discharge the battery. I thought, that I ...
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156 views

How to fully discharge supercapacitor?

My biggest problem is when I discharge a supercapacitor, let's say 100F 2.7V, I use a boost converter, but all boost converters have a minimum input voltage of about 0.9V. But the capacitor still has ...
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50 views

Deep Discharged Primary Battery Pack Voltages

I deep discharged two 4 cell (2S2P) 7.2 V Lithium Thionyl Chloride battery packs each connected to a GPS tracker. I ran the two packs until each GPS tracker stopped communicating. (can't be certain ...
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51 views

swapping the ground reference on a transformer's secondary winding

I'm looking to build a [simple] high voltage power supply in order to make electrets via corona discharge. I'd like to be able to fabricate both positively and negatively charged electrets using this ...
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51 views

What is the best general purpose variable resistor in a battery discharge circuit (10V < Vbat < 50V)?

this is a very specific question and i'm unsure if this is the right place to ask. I am constructing a battery discharge circuit. The discharge circuit specifications: To be able to discharge ...
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44 views

How can this high-side IGBT drive work without exceeding maximum Vg-e

I was reading an article that creates a device that model the I-V curve using on capacitive loads. In the article they using IGBTs to charge and discharge the capacitor. This is the circtuit that ...
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73 views

Calculate time it takes for a capacitor to discharge, when it is applied to VGS of a transitor

I want to usea 1uF capacitor to create an electric field between Gate and Source (VGS applied to dielectric) of a transitor. simulate this circuit – Schematic created using CircuitLab Since ...
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193 views

Calculate capacitance value and voltage rating in the event of ESD pulses

I have a input power filter circuit. It has ESD protection capacitors which help to protect the downstream circuit from ESD pulses. ESD Capacitors Specifications : C0001, C0002, C0003, C0004 = 47nF, ...
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64 views

555 Timer astable mode, capacitor discharges only through R2, why?

I'm pretty new to electonics so please bear with me... I'm looking at a standard 555 timer astable circuit. When the capacitor is discharing, I am having trouble understanding why it discharges only ...
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Battery fast discharging

It is my first question on this forum. I have a problem with my arduino project. I am working on a mobile robot. I use L298P Motor Shield for controlling the two 5v gearbox motors. The power supply is ...
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Practical estimate for a capacitor discharge through a resistor and an LED in series

This question was asked before, but I am struggling with the same question and I can't figure out "how to deal with it in the real world" as someone put it at the time. Olin's approximation is the ...
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1answer
49 views

MOSFET start up

The schematic is an approximation of my circuit. I am trying to know when SW2 is closed. So I have a voltage divider there to detect it. But what happens is when V1 is activated both FETs conduct ...
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26 views

RC Calculation With Charge Already On Capacitor

Is there a formula for charging/discharging a capacitor which is already charged to a certain voltage? For example, if I charge a capacitor to 3v, then switch to a 1v power source, how can V(t) be ...
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69 views

Simultaneously Charge and Discharge a LiPo

I have what seems to be a rather common problem, a circuit in which i wish to be able to simultaneously charge and discharge (use) a LiPo battery. The "charge" going "into" the ...
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62 views

Help - Battery discharge protection circuit

I am working on a LED (3 V/20 mA) torch circuit powered by 3.7 V/1000 mAh Lithium battery. Am planning to add discharge protection feature to this circuit. If battery voltage go down to 3.3 V the ...
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65 views

Calculate power on time of a buzzer

I would like to use a 5v active piezo buzzer to beep for a second or two. When the relay is on NO the capacitor will charge from the dc source and when the relay is on NC the capacitor will discharge ...
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46 views

Lithium coin cell battery showing randomness in voltage - Do batteries build up potential difference like a capacitor?

I've experienced Lithium coin cell batteries giving an initial spike in voltage discharge and then quickly dying down to very little voltage. This previous question (Lithium coin cell battery showing ...
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95 views

Help understanding secondary cells discharge curve

This is what I've understood about the process of discharging of a secondary cell. If I have a rechargeable cell, full charged, and I make it discharge at a certain constant current, let's say 1A, I ...
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29 views

Jeita compliance for discharge?

I know there is a Jeita compliance charging scheme for charging batteries. But is there such certification for discharging them in the function of temperature? The following is an image of the Jeita ...
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1answer
99 views

How to discharge batteries using bench PSU?

I've heard that if you can have negative current in PSU, you can use that to discharge batteries. Is this true? If yes, how to design/modify a linear bench PSU (which have transformer with several ...
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274 views

How to use a (cheap) BMS for discharge only

I'm building a small robot (for the context, with a pi zero, a PCA9685 motor controller, 8 small servo motors a regulator and an Ubec) fully powered from a 2S 18650 battery. I've inserted a (cheap) ...
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294 views

Discharging a capacitor without a resistor

Is the following circuit considered un-safe? That is, can a capacitor be discharged with a bare wire connecting the two terminals, or should some resistance be applied? Why or why not? Additionally, ...
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67 views

Why is actual SOC of a battery actually higher than what is displayed

So I read a document today which said that a higher SOC level (around 20%) is displayed as 0% to the user in vehicles, thus reducing the total capacity of the battery. My question is that why is that ...
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251 views

When do we need a bleeder resistor?

In the power supply design that I have, I used a NPN transistor to pull constant ~10mA from the linear regulator: simulate this circuit – Schematic created using CircuitLab Before the ...
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73 views

Custom spot welder design for very small scale

This is an R&D project to test feasibility. I need to try and weld a fine tungsten wire (50 micron) to a small piece of copper. The obvious solution (to me) is to place the wire on the copper and ...
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86 views

Is it possible to get a continous power with a constant current demand from a battery

So lets suppose I have to design a battery which has a continous power rating , if my load draws constant current ofcourse the battery will discharge and the SOC drops and so does the voltage. How in ...
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82 views

How to design a switched mode battery discharger

I have a very basic understanding of switched mode power supplies and know that this is a simple buck converter suitable to e.g. charge a 12 V car battery from an input of, say, 24 V, with a dc ...
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76 views

Decrease electromagnet discharge time

I have a conveyor belt under which there are electromagnets to hold a piece of steel during movement. At the end of the belt the pieces must be unloaded with suction cups. Over a certain speed the ...
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718 views

Supercapacitor spot welder - which capacitors to use?

I built a spot welder using a big transformer (approximately 4kW from an old welding machine) but I now need to build a spot welder with more power (more current.) The current spot welder works great ...

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