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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12 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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71 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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47 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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88 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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64 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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2answers
81 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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1answer
66 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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1answer
84 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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2answers
61 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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2answers
45 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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116 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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2answers
34 views

Energising Electrostatic Charge Into Nylon Ribbons? Is it possible?

Forgive me for how high level this is but this is the goal I'm trying to achieve here: I want to build a device that has dangling ribbons of a material (lets say nylon for now) that can be actuated ...
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36 views

In an open circuit, are capacitors still in “series”

In the picture below, there are two capacitors right next to each other in an open circuit (ie the wire with V2 written above it does not go to ground). Assume that each capacitor had been previously '...
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39 views

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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1answer
54 views

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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1answer
65 views

How should I drain a capacitor in a rectifier circuit?

I am trying to learn how to drain a capacitor after disconnecting power from a rectifier circuit. Specifically what I have is a step down transformer from an old wall wart charger that I have modified....
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2answers
119 views

How to calculate a lithium-ion battery's discharge time at a specific load?

How do i calculate the discharge time for an lithium-ion battery at a specific load? Let's say i have a lithium-ion battery with a nominal voltage of 3.7 V, a cut off voltage of 3.0 V and a nominal ...
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1answer
55 views

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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1answer
173 views

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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1k views

What difference between two discharge resistors in two circuits?

When I search for 220VAC led indicator, I found two circuits one from here circuit 1 another here circuit 2 The purpose of R1 from two circuits for discharge C1 when main AC off, but is there any ...
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42 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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5answers
150 views

Why does a capacitor charge and discharge?

I know that a capacitor would resist a change in the voltage across its two ends. Assume that the capacitor in the diagram is a fully discharged capacitor( 0v across its ends). Now if I connect this ...
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1answer
232 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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6answers
182 views

True or false: A capacitor stores energy for ½ a cycle and gives it up on the other half, the net energy is zero

I'm hoping someone can give me some more information so that I can confidently answer this question. . . True or false: A capacitor stores energy for ½ a cycle and gives it up on the other half, the ...
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1answer
120 views

Discharging capacitors with a multi-meter in diode mode

Recently I encountered this "trick" where you use a multi-meter in diode test mode to discharge a large electrolytic capacitor. I feel that this cannot be a good practice, but the people who were ...
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1answer
61 views

Newbie questions: Calculating the time to discharge for a capacitor

I am looking to charge a capacitor using a simple DC power supply. however, I was curious how I could calculate the time until my capacitors would discharge. Also, would an inductor placed in series ...
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67 views

Automatically Discharge Capacitor When Full

A disclaimer: I have little electronics knowledge. My issue: I would like to be able to charge a capacitor and automatically discharge it when full. The fuller story: I will be generating a very ...
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2answers
78 views

Ultracapacitor initial voltage drop during discharging

I've been building a test stand for ultracapacitors, with very simple schematic looking like this: simulate this circuit – Schematic created using CircuitLab The resistor on the bottom is to ...
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44 views

How to calculate a capacitor's discharge time? [duplicate]

How do i calculate a capacitor with a specific capacitance loaded with a specific resistance discharge time and reach a specific voltage? So let's say i have a 22uF capacitor charged with 12 volts ...
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2answers
53 views

Discharging radial electrolytic capacitors

I'm a beginner/intermediate in electric engineering and had to discharge a few electrolytic capacitors last week in a hobby starter kit (not too high voltage) and now I have to discharge some more ...
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2answers
95 views

Constant current load circuit? (20 amp) [closed]

I'm pretty new to stack exchange and I've only just gotten my basic circuit analysis classes done in college. For my school's solar racing team, I've been tasked with designing a constant current load ...
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1answer
84 views

Comparator loses voltage when connected to mosfet

I want to make a discharger for 18650 batteries so I can store them at a specific voltage. I built a comparator (LM393) with a voltage reference to 3.8V at the inverting input and the voltage of the ...
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1answer
45 views

battery fully discharging [duplicate]

My goal is to use my laptop, a pioneer dj controller and 2 krk rokit 5's (50W class-AB amplifier boxes) for a party all at the same time for about 6-8 hours in a place without access to grid power. ...
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100 views

Current in charged RC circuit

I've the following circuit: simulate this circuit – Schematic created using CircuitLab The capacitor is charged up to 10 V according to the following formula (when the switch is closed): $$\...
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11answers
5k views

How to safely discharge oneself

At work I have the problem that I seem to collect a lot of static charge as soon as I leave my desk and return. I am not quite sure why this happens. Strangely enough the effect is stronger the ...
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2answers
91 views

Removing a charged coil from circuit

I have a question: If I charge a capacitor through a resistor and remove it from the circuit, the capacitor will be charged for a certain amount of time (eventually the voltage across the capacitor ...
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81 views

Right cable for high-current (10 kA) discharge

I need to discharge a 80 nF capacitor, which potentially charged to 10 kV. I am using a HV resistor, 1 Ohm, wherefore the RC of the discharge circuit is 80 ns. What kind of cable (gauge?) should I ...
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2answers
106 views

How long does it take 1mA discharge current to discharge 24V 35Ah battery down to 8V

I am using a circuitry which has to be connected to 24V battery at all times. The circuit works 8-32VDC so it will be OK down to 8V. How long does it take 1mA discharge current to discharge 24V 35Ah ...
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2answers
70 views

Calculating charge given current and capacitance over time

I it possible to calculate the charge on a capacitor when only having the current, time and capacitance value? I tried using this formula to first calculate the voltage and from there the charge. ...
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2answers
73 views

Can I connect 10 AWG wire carrying up to 25 amps to 10 parallel 1 ohm 10 watt resistors?

I am trying to measure the charge capacity of some LTO battery cells. To do this I want to discharge each battery cell from 2.5 V to 1.7 V. I am going to measure and log the current over the discharge ...
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129 views

How to switch between charge and discharge?

I want to make my rpi 3 portable with adding a rechargeable battery pack to it. I have 6 Li-ION batteries that are packed together in 2 series rows of 3 batteries in parallel(each battery is a 3.7 ...
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1answer
138 views

CSB batteries Constant Current Discharge Characteristics

I'm comparing batteries for use in UPSes and during my tests I was consulting the datasheets of 2 manufacturers. The datasheet from SunLight is crystal clear but CSB's datasheet is using terminology ...
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1answer
356 views

Does wiring 18650 batteries in parallel and/or series increase the discharge rate of the whole pack?

I cannot seem to find a solid conclusive answer anywhere on this, but if I build a pack of 6 18650 batteries in parallel which are 3500 mAh each, that would make the pack 21 Ah in total. Then I take ...
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178 views

Will this capacitive discharge welder design work?

I'm an electronics newbie trying to learn about the subject through tinkering, and my current project is a capacitive discharge welder for welding on battery terminals. I thought I'd better have ...
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0answers
54 views

X2 capacitor discharge/bleeder

My application has a High voltage battery (close to 530v) which is then connected to a DC DC converter that has a input X2(30µF) capacitor. My question is about the bleeder resistor design. Would ...
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0answers
9 views

Battery Discharging and Effect on Lifespan

I have noticed that some times during the day when my solar system panel is shaded it starts using the battery bank power (a few ampers) for a few seconds and then recharges the battery after the ...
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1answer
279 views

Actual lifetime of 18650 cells

For a project, we are currently looking at how long we could use battery cells, such as the LG 18650MJ1 at maximum discharge and maximum charge in 25°C ambient temperatures. Basically, in this case, ...
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139 views

What is 'DOC' in terms for Depth of Discharge for SLA batteries?

I'm trying to understand the spec of a SLA battery. There's a chart which is titled "Cycle Life in Relation to Depth of Discharge": Can I ask what 'DOC' stands for and the chart is read? How come ...
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2answers
124 views

Discharging a capacitor with an analog switch

I'm designing an op amp integrator with a 100nF capacitor, and need to include a logic level reset/discharge option. I would like to use the DG467 analog switch due to its low cost and small package, ...
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133 views

Calculate battery discharge time to a certain voltage value [duplicate]

Let's say I have a 14.8V battery with capacity of 5200mAh. My load constantly draws 20 amps from it. I want to estimate the time it takes until the cell reaches let's say 10V. This is just an example, ...

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