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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Capacitor current in parallel network with ESR and parallel resistance

So this might be a very simple question and I've got a knot in my brain but I've been at this for days and don't see how I could solve this problem. I'm trying to find the solution for both ucA, ucB(t)...
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Not satisfied with 2.5 V battery protection shutoff. How to stop discharge at a safer voltage?

I have some of these lithium ion battery charging modules which are very commonly available online. They use a TP4056 charger and a DW01 protection IC. The DW01 datasheet says that it should cut off ...
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2 votes
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Electrospray Deposition

I recently got a new project to work on, an Electrospray Deposition setup. Basically, it consists of a needle that contains a liquid, a electrode and a high voltage source. The needle is positioned at ...
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NiMH battery discharged to 0V

I have a 90's handheld CB that I'm powering using 10x1.2V NiMH cells all in series. Because these cells are rather old (at least 8 years), when I got a low voltage warning, I decided to measure all ...
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2 votes
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229 views

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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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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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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2 votes
2 answers
262 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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Cascade of 555 timer with Control Voltage not triggering

Hi I'm currently working on a cascade 555 circuit, both operating in the monostable mode. I also want to be able to control the pulse width with a voltage so am using applying 0-5v to the ctrl pin (...
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UART IO not working, placed multimeter to measure voltage and IO began working instantly - why?

We are a bit stumped on this and wanted to see if anyone had any experience or perspective on this. Description of Event We are communicating via UART from a 3.3V processor to a Sim7000G (1.6-1.8v). ...
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Prevent capacitor discharge after it was charged using a microcontroller

I want to use a micro-controller (like an Arduino) to: Charge an external capacitor Measure voltage across the capacitor Capacitor discharge rate as low as possible. Capacitor discharge rate while ...
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I have a problem with capacitor discharge in an ignition circuit CDI

I have a hard time understanding what the problem in this circuit is, can someone help please? I have a Moped with its capacitor discharge ignition box. It works fine, the spark exist, but I want to ...
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152 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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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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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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Why do the polarities of the capacitor change while discharging?

I was going through the working of class D commutation and the article said: As soon as the capacitor completely discharges, its polarities will be reversed but due to the presence of diode the ...
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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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UCC28C44 flyback start-up problem

I have a problem with a design of a flyback converter for a power supply. I am using UCC28C44 PWM IC. Converter should star up with at least 200V and VDD should be charged to 14V when 15V should ...
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Powering 5" display with LiPo batteries

I'm using a 4DSystem 5" display with Arduino MEGA 2560. Normally Arduino is powered through a wall power supply but, in some conditions, I need to power the Arduino + LCD with batteries (for not more ...
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151 views

Dicharge a Photoflash Capacitor in a coil

I am trying to do the coin tosser according to this pdf (result here) So the circuit is supposed to be this one: simulate this circuit – Schematic created using CircuitLab However when I did ...
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350 views

one-sided saturation with op-amp and RC high pass filter

I am working with a photodetecting circuit built as follow: When I drive an LED ON and OFF, I get the following waveforms: Blue indicates that the LED is turned on when a voltage is high and turned ...
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Li-SoCl2 battery state of charge

I'm developing a data logger powered by Li-SoCl2 (http://www.100y.com.tw/pdf_file/02-SAFT-LS33600.pdf) battery and I have no idea on how to overcome the problem of estimating the residual charge of ...
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Old 9v battery - Strange Behavior

The battery in my garage door remote finally quit. Before replacing it, I measured the voltage with a digital multimeter and was surprised to find it reading 9.70v, quite a bit higher than the ...
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2 answers
86 views

How can I quickly discharge a capacitor in a Zener on-delay timer circuit?

I have a project that requires using a delayed latching circuit. I found two circuits that I could combine, a on-delay timer circuit from TheEngineeringMindset and a latching circuit from ...
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Drawing more current from a battery than what it was designed for

I have built a system that requires at least 8A to run properly. It is powered by 6S1P li-ion battery pack protected by BMS circuit. I did some research and found that maximum battery current output ...
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349 views

Is it acceptable to connect a car battery and an AGM battery in parallel?

I power a 12V fridge in my car either via the car battery (when the vehicle is running) or via an AGM battery. There is an Anderson outlet in the car connected to the car battery to which I attach a 3 ...
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TP4056 DW01A Problem

I have TP4056 with protection circuit. In charging, Everything is OK. OC : VDD - VBAT OD : VDD - VBAT While the battery is charging, the circuit continues to work on the battery when the charging ...
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Spark generator current limiter

I am using a spark generator for electrical discharge machining and mounted a current transducer to read the current value of the arc between workpiece and electrode. When the electrode gets too near ...
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88 views

Why are lead acid battery cutoff voltages inversely proportional to discharge time and is it OK to discharge down to 1.6 Volts per cell at C0.25?

I'm sorry if this is an obvious question, but I've been scratching my head with it for a while. I am used to UPS backup batteries that have an autonomy time between 2 to 4 hours, so I have always ...
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Charge settings for hybrid battery module

I am currently overhauling and replacing worn battery modules for my Toyota hybrid vehicle. I have purchased a SkyRC q400 smart charger to charge all the six cell Nimh modules before I assemble them ...
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Lithium discharger with what I have laying around the house. Review pls?

I'm trying to MacGyver my way around discharging some lithium ion cells down to a set voltage I can safely store them for maximum life. My main issue was I don't have a decent voltage reference as low ...
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VPC0820 Li-Ion Capacitor how to understand the 97% Self Discharge (V) parameter

Does anyone know what does the self-discharge parameter mean? I know what self-discharge is, but what does over 97% mean?
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Shorted 18650 Li-Ion Batteries

I accidentally shorted three 18650, 3700 mAh batteries connected in series for about 2 seconds. I measured each cell individually with a voltmeter and they read very close to its original rated ...
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47 views

Battery Charging and Discharging rate

I did some calculations for hybrid renewable energy system and I calculated the energy from PV and Wind. Then I modeled a battery for both the PV and the Wind energy systems. I found that energy ...
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1 answer
180 views

Handle simultaneous charge/discharge with a BMS

I am building a series of 13s LiPo battery packs, each with a BMS with B- P- and C-. They are to be charged with a regulated source from a PV array. I know this likely depends on the specific BMS, but ...
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Can I connect a smart charger to a lithium battery with a BMS

I have several tools with NiCad batteries which are failing due to the age of the batteries. I refuse to throw these perfectly good tools away and wish to convert the batteries to lithium. I HAVE ...
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164 views

Using discharge protection, BMS and balance charging?

I am building a small high quality headphone amp which needs power supply +/-7V up to +/-17V. According to the manual it uses maximum 200mA. I like to use 2 x 3 16340 rechargeable lithium batteries ...
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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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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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Question about charge and discharge of a capacitor

Let's consider the following amplifier: and suppose that a capacitor is connected between the output node and ground. Let's suppose that the inverting terminal becomes much larger than the non-...
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What voltage do we use for battery cut off voltage?

I have a battery that states a 2.75v battery discharge cut-off voltage. Is that voltage measured at the poles of the battery while it is connected to the load or they are talking about the ...
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50 views

When to monitor battery capacity

While other good answers have stated why discharging a 12V lead acid battery is hurtful to it, I seem to be unable to find how you should monitor it. Assuming I want to stop drawing current from the ...
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1 answer
1k views

How to operate a 12V/5V NE555 timer relay from 12V DC supply and capacitor

Problem: I need to switch ON a NE555 timer relay from 12V DC supply when the DC supply is switched ON. Also, when I switch OFF the 12V DC supply, the relay should switch ON again as it is a timer ...
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2 answers
69 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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1 answer
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Does the charge of a battery affect its discharge voltage or current?

Although I am making an electrochemical battery (1 lead acid cell), I thought that this question would be more suitable here. Would there be any difference in the voltage and current of the cell (when ...
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1 answer
161 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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2 answers
316 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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1 answer
631 views

Discharge Characteristics of Lithium Ion Battery

I am doing a simple experiment to analyse the discharge characteristics of a Lithium Ion battery to see how long it takes to discharge. I have a 12V 4000mAh battery. Once charged, using a voltmeter I ...
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-1 votes
1 answer
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What is the charge flow between a charged capacitor and an uncharged capacitor connected in series

What will be the charge on both the plated after bc is closed? (Imagine that both the C1=C2=C)
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