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.

Filter by
Sorted by
Tagged with
1
vote
1answer
59 views

Determining discharge curve of capacitor with I(V) curve

I have a 1 F double layer capacitor in a circuit supplying power to a micro-controller and an RTC circuit. I will be measuring the I(V) from 5 V to 0 V Is there a way to predict the discharge curve, ...
0
votes
2answers
85 views

Efficient discharge of capacitor voltage to 2-10 ohm DUT

I need to apply the voltage in a capacitor to a load (between 2 and 10 Ω) and need to have the most efficient and simple method to do so. The goal is to apply power to a DUT (device under test), ...
-1
votes
1answer
52 views

What is the maximum DOD for a Li-Ion Battery?

I bought these 4.8 AH, 3.7 V - 4.2 V lithium batteries that came without a datasheet and I didn't manage to find it anywhere on the internet. Can someone figure out its maximum safe discharge voltage ...
1
vote
1answer
492 views

Diagnose battery drain in small appliance [closed]

Novice here, wondering of any "low hanging fruits", very simple initial checks that one can do to find out why a small, AA/AAA battery-operated appliance is draining them faster than it's ...
0
votes
1answer
73 views

What resistor is needed to discharge a capacitor of about 3kV (inside a microwave)

I've already made a capacitor discharge tool for a 300V capacitor and works fine using the 2 resistors that were on the PCB with the capacitor. I need to upgrade this to discharge a microwave ...
0
votes
2answers
40 views

Protection circuit module for not only “deep” discharge protection

I have to ask about protection circuit module, like BQ297xx, AP9211, AP9101 etc. As I see, protection circuit module is used to protect li-ion cell from deep discharge - so if the li-ion cell has, for ...
1
vote
2answers
71 views

How to calculate the discharged current of a capacitor from the discharge curve?

I observed the discharge of a capacitor on an energy harvester chip via an oscilloscope. The Output was used to power a BLE module. I know the capacitor value, discharge time, and the top and bottom ...
0
votes
1answer
44 views

AA primary batteries in series and parallel configuration

As shown in above image we are using two AA alkaline batteries in series and two in parallel. Each battery is 1.5 V and 2700 mAh in capacity. So in above configuration total battery voltage would be 3 ...
0
votes
3answers
59 views

Equalize batteries

I have two (2) 12V, 7Ah SLA batteries. I want to use them in parallel to support my load. I am not sure about their charge state. How do I equalize them to same voltage and current so that my ...
0
votes
2answers
126 views

Bleeding resistor high voltage high efficiency

For a design I am working on a wind energy control circuit. The circuit has a maximum voltage of around 450 Vdc. When powered off, I believe it is safe to discharge the capacitors through bleeder ...
0
votes
1answer
57 views

Battery voltage measurement

I am using a charging and discharging circuit to do operations with a Li-ion battery. When I charge the battery at 4.2V rated voltage and at 1 ampere current, I want to continuously measure the ...
0
votes
2answers
127 views

How to calculate mAh draw from a battery?

I'm trying to calculate the "drained" capacity from the battery each second so I can get the nearest possible capacity used. This is how I'm getting this. dischargingCurrentSum - Is the sum ...
0
votes
2answers
110 views

Capacitor voltage function

How would you find the mathematical function of the voltage discharge curve for a capacitor considering the following circuit and conditions: When time t=0, the capacitor is fully charged with the ...
0
votes
2answers
49 views

Lightbulb powered with batteries

I am powering a 12V 6W lightbulb with two 9V zinc-carbon batteries in series. The voltage should be high enough to power the lightbulb, but the light is only visible for around 40 seconds before it ...
0
votes
3answers
111 views

Capacitor discharge from one pin. Is it possible?

According to circuitry rules nothing should happen when we connect the probe in following schematic but it doesn't make sense for me. The capacitor must be discharged. What's the reality?
1
vote
1answer
141 views

SOC (state of charge of batteries) for LiFePO4

I am trying to find the state of charge (SOC) of some batteries I have 3 LiFePO4 batteries, these are the ones I have purchased: https://www.ampsplus.co.uk/ampsplus-14500-3-2v-500mah-battery-button ...
0
votes
1answer
36 views

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 ...
-1
votes
1answer
58 views

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)
0
votes
0answers
43 views

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 ...
0
votes
1answer
78 views

Capacitor discharging time [closed]

What is the time needed for discharging, when a charged capacitor is connected to an uncharged one in a circuit along with an AC voltage source? Since a lot of people asked to give more information ...
1
vote
1answer
55 views

Automatic capacitor discharge circuit

I need a (preferably analog) circuit to monitor a solar cell trickle-charged capacitor and automatically discharge the capacitor when it's charged. The idea is to use solar cells to power small ...
0
votes
0answers
20 views

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?
0
votes
1answer
78 views

Powering the load while charging 3s 18650 battery with BMS balance charger PCB

I want to charge use this battery management system (BMS) balance charging board for charging and management of a 3s 18650 battery. The load and charging port is connected in parallel with power port ...
0
votes
1answer
55 views

How much heat is generated by a Li-ion phosphate battery during discharge

I am designing an enclosed container with 10 kWh 50 V battery in it which requires me to actively remove the heat. The battery feeds an 8.8 kVA inverter. Assume I have a load of 8 kW, which would draw ...
1
vote
1answer
56 views

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 ...
0
votes
0answers
61 views

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 ...
0
votes
0answers
45 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 ...
0
votes
1answer
49 views

Frequency of the standard battery discharge curve

What can we say about the frequency of the discharging battery? You know that batteries, for example Li-Po, have a characteristic charge and discharge voltage curve. And under a certain rate of ...
0
votes
1answer
69 views

How do safely discharge Li-Ion batteries to check full capacity

I regularly have to test old phone batteries in my mobile phone refurbishment business. I need a safe solution to discharge 3.6V batteries. When I buy batteries they come from old stock so I need to ...
2
votes
1answer
63 views

Relationship between depth of discharge and energy efficiency for a Li-Ion battery

Consider a lithium ion battery that is continuously cycled at different depths of discharge (say, 20% vs. 40% vs. 80%) and at a constant c-rate: It is well known that the larger depth of discharge ...
0
votes
2answers
128 views

How do I safely discharge a 3900 pF 3 kV (and 9 kV) capacitor?

I am planning to built a circuit with 3 polypropylene film 3900 pF 5% 3 kV DC radial capacitors connected in series. Before I start this, I want to make sure the capacitors are safely discharged. I am ...
2
votes
2answers
208 views

Why should I put a Schottky diode and a resistor between a USB connector and a TP4056 charger IC?

I've found this useful explanation for a load sharing circuit based on the established TP4056 charger IC: LINK: https://www.youtube.com/watch?v=T70mBHeIOZA&ab_channel=WellDoneTips SCREENSHOT: Now ...
0
votes
1answer
58 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 ...
2
votes
2answers
222 views

Can an electrolytic capacitor discharge through its top?

Can an electrolytic capacitor discharge through its top? Is it potentially dangerous to touch a large electrolytic capacitor on the top if fully charged?
0
votes
1answer
48 views

3S Lithium-Ion power solution for a project

I have a PCB that runs on 12V throughout the day and consumes 2.3A. The power is supplied for 12 hours using a power supply. The other 12 hours it must run on batteries that have charged during the ...
1
vote
1answer
76 views

Discharge rate of a motor run capacitor?

I have a capacitor on a pool pump, specs : Motor Run Capacitor Round 30 uf MFD 370 Volt VAC 12717 As I understand even with electric circuit the pump is on turned OFF, the capacitor can still carry ...
0
votes
0answers
21 views

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 ...
0
votes
0answers
81 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 ...
0
votes
0answers
125 views

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 ...
2
votes
2answers
479 views

Current limiter circuit is damaging MOSFETs

I have a circuit where a charged capacitor must be discharged over a load resistance. The trigger switch here is a 10A relay so, to avoid damaging it when the load resistance is too low, I decided to ...
0
votes
2answers
241 views

How to prevent a Lipo/Li-Ion-Battery from catching fire after a complete self discharge with a following accidentally recharge

From the following Youtube video (at 3:15min) I got that it is dangerous to recharge a Lipo/Li-Ion-Battery after it was completely discharged (0V), because it will catch fire. https://youtu.be/...
1
vote
1answer
185 views

Derivation of Discharging Current of an Inductor

Consider the following circuit: When \$t > 0\$, the inductor \$L\$ begins to discharge. I already know from KVL that the sum of voltage drops in the loop containing the inductor is: \$L\frac{di(t)}...
0
votes
2answers
222 views

Discharging a capacitor through a depletion MOSFET

I´m building a device to remotely operate a solenoid through a data link. That device, which is powered by a 9V battery, has a step-up circuit to raise the battery voltage to +- 160V which, in turn, ...
1
vote
1answer
128 views

i have problem with capacitor discharge ignition circuit CDI

i have a hard time to understand what is the problem in this circuit, can someone help please, i have a Moped with its capacitor discharge ignition Box work fine, the spark exist, but i wanted to make ...
1
vote
0answers
106 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 ...
0
votes
1answer
44 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 ...
2
votes
0answers
118 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 ...
1
vote
2answers
89 views

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 ...
0
votes
0answers
34 views

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{ ...
1
vote
1answer
218 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 ...

1
2 3 4 5
8