Questions tagged [charger]

A device which controls the voltage and current being delivered to a capacitor or battery.

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20 views

Solar Mobile Phone Charging Project

I have a Solar Panel of Rated Voltage = 8.95V & Rated Current = 0.34A, I want to make a phone charger with output of 5V & 2A, Please Help!, this is my 1st project.
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65 views

Is it safe to use an “18v ~ 20v” power brick/adapter for a device that originally had an 18v adapter?

We have a device that uses an 18v adapter/power brick, unfortunately the adapter broke. As a replacement, we are considering an adapter that has a "18v ~ 20v" rating printed on its back. ...
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Over voltage protection circuit for Iphone devices

All powerbanks I have found are able to provide 5V, which is perfect for android smartphones, but not for Iphones, which have a nominal voltage of 3.8V. However, powerbanks of 5V may be used to charge ...
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51 views

Is charger with USB C connector and 13V output in line with standards?

I have bought cordless rotary tool. The charger which is included in the package is equipped with USB-C connetor, and the charger has rated output at 13V @ 1.5A. Is this "legal" according to ...
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Chaining TP4056 modules, the proper way

I know a similar question was asked before, but still, it didn't aswer what I'm looking for. I need to charge a series of 6 Li-ion cells, and maybe 12 in the future for a voltage hungry project. Since ...
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54 views

How to avoid AC in cheap DC charger

I bought a cheap DC charger a couple of days back and I have been using it to charge my headphones and other small electronics. I recently noticed that there is small amount of AC, less than 1V, ...
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32 views

Can i charge an LiFePo4 32650 cell using an 18650 li-ion charger

i have this li-ion 18650 charger i found, pic attached below. I need to know if i can use this to charge a LiFePo4 32650 cell i bought here, the cell doesnt fit in due to the obvious differences in ...
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68 views

Maximum Power Point Tracker (MPPT) charge controller - what drives the weight?

I'm having trouble finding any literature paper that studies this problem. What drives the weight of an MPPT charge controller? How would I go about reducing that weight if I had to design a custom ...
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Charging nicd battery with pwm

Hi I plan to build charger circuit to charge high capacity nicd battery. The charger will output 40A , is it safe to limit and reduce the current using pwm IGBT/mosfet so the output will be pulse ? !
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52 views

Can I use a lithium charger for a bluetooth speaker with a NiMH battery? [closed]

I have a BlueAnt bt blast bluetooth speaker that I need a new charger for. It says DC 12V on the back by the power supply. I checked the manual and this speaker has a NiMH rechargeable battery. Can I ...
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BMS battery build DIY help

I am making a battery charger for a speaker using 4 18650 3.7V batteries. Now I know that I would need to get a 4S Lipo or Li-ion PCB, the only thing I don't understand is the current rating that I ...
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Charging batteries with a PCB Charger

I have a 4 slot battery holder with 2 wires coming out of it, best I can describe it. I'm planning to get a 14.8V Li-ion PCB charger (of course this will be used with 3.7V Li-ion batteries). One thing ...
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AC divider circuit used to charge a capacitor

The following circuit uses a capacitive divider network along with a diode rectifier to charge a capacitor. I assumed that once C2 is charged to its maximum( calculated to be around 14mV) the diode ...
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47 views

Battery/Charger Not Reaching Float with Load Attached

I'm trying to add a backup/UPS to a system I have outside with the following battery charger - https://www.meanwell.com/Upload/PDF/ENC-180/ENC-180-SPEC.PDF . The DIP switches are set for AGM mode. My ...
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60 views

How to identify transformer pin out in genuine mobile charger?

can't find any information about it on Internet ,does there any practical procedure to identify, like removing it from circuit and measuring its coils resistance. or a website that i can find ...
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USB-C charging cable for Nintendo Switch

I am trying to change a broken USB-c charger connector for a nintendo switch by changing the male end connector. The charger cable has 5 wires 2 red(Vbus) 2 Black (GND) and a small white cable that ...
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Battery Discharged - But Potential difference exists without any current flow

My below question is regarding batteries. I have a USB charger and a mobile battery (Li-ion battery). So, my mobile battery percentage has dropped to 0%. So, what I do now - Take the USB Charger. Plug ...
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1answer
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On Samsung mobile phones, how does its USB host know when to charge the phone and when to power the connected device?

How do mobile phones (Samsung, in particular) distinguish between being charged and having to power the connected USB device (i.e. flash memory stick)?
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How does this circuit work? (TP4056, DW01)

Why are capacitors C13, C12, R20 used here? And why resistor R18 and C5? (What function do they perform?) I don't understand why they are installed there. Datasheet: TP4056, DW01, FS8205A.
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112 views

Lithium Battery Charger using LM317

I have come across the following circuit in a datasheet for a battery charger: I have also seen a similar use of the charging circuit for use as a lithium battery charger, e.g http://shdesigns.org/...
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Proper algorithm to charge LiPo batteries

We are going to develop a new LiPo battery UPS circuit for our handheld. I have read couple of articles and almost all of them recommend to charge the battery based on the following curve. I have also ...
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26 views

Limit Voltage to Load

In this circuit, either the battery or the charger will be powering the load depending on the voltage of the battery. The problem is that both battery and charger can potentially be 16.8 V sources and ...
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2answers
62 views

Boost Converter Stuck at Around 80 Volts

I'm building a boost converter that utilizes a 555 timer switching at 60 kHz at a 96% duty cycle which drives an IRF3205 MOSFET to power a hand wound inductor (calculated to have ~330 uH) with a 6A10 ...
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28 views

Laptop charger voltage decreases gradually when plugged in, laptop won't charge

Recently, I tried to charge a laptop I had not used in a long time, but it didn't work. I took out a multimeter and measured the voltage coming out of the laptop charger, a Delta Electronics charger ...
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Reduce 50 Hz noise from robot-mower charger

I just bought a robot-lawnmower (Husqvarna Automower 105), which is working perfectly. But the charging station is making a loud 50 Hz noise all the time, even without the robot charging. I have ...
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Solar Li-Ion Charging with load-sharing

I need some help regarding my project. I have made a dog feeder with Arduino Uno, which is powered with a 3000mAh Li-Ion battery. I want the system to be charged with a solar panel (more solar panels ...
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Ericsson T20 battery charging circuit details

My question is simple, does anyone know what IC and FET was used to charge the battery of Ericsson T20 phone?; I have a dozen of these small battery charging boards and I can't find the IC/FET by ...
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47 views

protection IC stopping battery from charging

So, I'm using an AP9101C as protection IC and MCP73811 as a charger IC for a single cell lipo like this: The load works fine and when I connect +VDC (5V), suddenly CO of AP9101C goes to 0 preventing ...
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137 views

Why is my self built LiFePO4 battery pack not charging?

[NOTE] I understand that the adapter that I bought for my battery pack is not actually a charger. I also understand that it could be dangerous what I'm doing. I still wonder why there is no current ...
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63 views

Why doesn't current fall to zero after unplugging the charger? [closed]

I use an automatic charger to charge my lead acid battery. After the battery is fully charged, it shifts to maintain mode, where the charging current reduces to as low as 13mA. I noticed that even ...
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Field charger setup with either/or dc supply

I have a lithium polymer battery charging setup that has the charger in a box with 2 dc power supplies wired in series to create 24V. The power supplies are Meanwell LRS-12-350. Currently there is an ...
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How to charge an android device with a buck converter

I've got a male micro USB connector like this one I'm feeding the output of a buck converter set at 5V to pin 1 positive and pin 5 negative. Remaining pins are not connected. When I plug the ...
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Do high voltage low amperage motors exist?

I have an idea, which is essentially using the power running down an electrified electric fence to move a stretch of wire between two fences. I have been trying to find if it is even possible to have ...
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76 views

could this be a fuse?

I was so stupid to leave a Ring rsc 516 smart charger in the rain. Hopefully, only the fuse is blown. However, I am not sure where the fuse is? could it be the black thing on the photo? I did a ...
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46 views

Reversing the input of a transistor

I want to detect if a 12V DC line has power or not. I want the transistor to work like this: If pin 2 has 5-12V, pin 1 and 3 should be disconnected and should stop the flow of 5V 2A across pin 1 and 3....
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How to charge multiple 3.7V LiPo batteries in parallel?

let's say I have 4x 3.7V LiPo batteries connected parallel. I want to use TP4056 charger boards to charge them. (see picture) As a power supply, I use a 5V 15A adapter, so there is plenty of power ...
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46 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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How to repair the charger pin when it got stuck in the switch

My laptop charger got stuck in the pin hole while it was charging and its put a dent on my charger .I removed the pin and would like to repair it. I tried gluing the pin using a permanent glue and ...
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27 views

Question regarding a charger modification for a Dell 3100 docking station

I'm quite new and inexperienced to this so I would appreciate any guidance I can get. Given the quarantine situation I need to work from home more so I purchased a used D3100 docking station but with ...
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106 views

Is this a float charger or trickle charger?

Below is a simple charging circuit using LM317 and BC547 and it is mostly classified as a float charger in many forums. This seems to reduce the current flow when the battery is fully charged, however ...
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100 views

Li-ion battery charging termination current

I have almost no experience with Li-Ion charging. Documentation to battery is very poor, but there is an info about charging profile: Stage 1: Constant Current 0.82 Ampere (0.2C) until Voltage ...
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60 views

Always plugged in solution with battery backup

I am trying to design an micro-controller based solution which is always plugged in and has a battery backup in case of power failure. I am using an SMPS power supply rated 15V, 1.4A which is always ...
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114 views

Converting USB 2.0 charger to USB C

We have a typical USB 2.0 wall charger that has a USB A receptacle. Our charger has D+/D- connected together through a small resisor (<200Ω) to let devices know the maximum power is 1.5A/5V ...
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30 views

Use old battery pack charger as DC power supply?

I have an old charger for NiCd battery packs. It is labeled with: Input: 230 V~, 50/60 Hz, 33 W Output: 4.8 - 12 V DC, 1.4 A I opened it and found a transformer and two circuit boards. I made a ...
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111 views

How to use MCP73831 with multiple voltage sources correctly?

I'm trying to use an MCP73831 with multiple voltage sources (one is from a 24VDC to 5 VDC regulator, the other one is from a standard USB) but I'm having a bit of a problem. For the moment, I'm only ...
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84 views

Using laptop charger with slightly higher voltage

I am wondering if it is safe to use a MacBook charger on my Lenovo laptop. Both devices charge via USB C PD. When looking at the voltages I can see that the Lenovo adapter is 20V - 3.25A The MacBook ...
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95 views

What is wrong with my USB Li-Ion charging circuit?

I'm trying to design my own PCB based off of this one: My relevant schematics are here: Their Q3 transistor DMG3415U-7 was going obsolete, so I used DMP2045U-7, which seemed to be a similar ...
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49 views

Using a “Normal” powerbank for a “Super Fast Charging” phone, are there any potential damages?

I have an Anker Redux 10000 mAh powerbank and a Samsung Note 10 Lite smartphone. My powerbank is capable of providing an output of 5V ⎓ 2.4A, with only "normal" charging mode (no QuickCharge or other ...
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1answer
53 views

What charger for a 13s10p Li-ion battery pack?

I plan to make a battery pack for my vehicle, 13s10p Li-ion battery. It gives me 30Ah. If one battery can be charged at 1A, can I charge 10 batteries in parallel at 10A? For now I have a 2A ...
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1answer
68 views

Solar charger for Lipo battery

Im trying to build a little solar charger for a Li-po battery using 2 solar panels rated at 6V/120mA a linear charger based on the TP4056 chip The idea is to connect the two panels in paralel so ...

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