Questions tagged [charger]

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

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31 views

Battery to AC conversion of faucet IR sensor

I bought this faucet which includes a hand IR sensor, but it's battery powered. I wanted to convert it to AC power using this excellent Video as a guide. Since it takes 4 AA batteries, I bought an old ...
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Battery temperature charging cutoff protection methods

We have run into a requirement where we need to terminate the charging of our Lithium Polymer battery when the battery temperature exceeds the manufacturer rated temperature. My immediate reaction is ...
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62 views

Is this a capacitor or a varistor? How can I figure out specifics?

Is this a capacitor or a varistor? How can I figure out specifics?
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Li-Ion/Li-Polymer Battery Charger mcp73871-2cci/ml Issue

Hope someone can help. I have designed a pcb board based on the mcp73871-2cci/ml. No matter what I change there is no current draw and all the indication LED’s remain on. I have seen some example ...
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How do I wire up an aftermarket USB Type-C connector so that it works?

I recently broke the male port of my USB-C laptop charger. I already got a new one, but I would like to fix and repurpose the old one to be the power for my Raspberry Pi 4 instead of throwing it out. ...
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56 views

When is it appropriate to use a dedicated charging ic and when is it appropriate to use a microcontroller? [closed]

To give a little more context, I am designing a device that requires a battery to be charged. What I gather from most commercial designs and reference designs, is that they often use a dedicated ...
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24 views

MCP73871 and Mosfet Power Switch

I use MCP73871 battery charger, Battery and VDC (charge voltage) connected to MCP73871. VFEED is the output voltage of MCP73871. Circuit also have a MOSFET power switch. VFEED enters the MOSFET and ...
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Can i charge 18650 li ion battery by using transformerless power supply?

My question is very simple, can i charge 18650 li-ion cell by using transformer-less power supply. this transformer-less power supply convert AC current to DC current by using just capacitor, resistor ...
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62 views

How does a desktop charging station decide its output voltage? [duplicate]

I have this charger: http://www.shintaro.com.au/product/shintaro-multi-device-charger/ It supports QC3.0 and has: ...
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24 views

Will USB-PD work with and extension cable in the circuit?

I want to replace the USB type A port on my trucks dash with a USB-C panel mount and give it the ability to "fast charge" my phone. Unless there is a product that I am overlooking it seems I ...
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59 views

Lithium ion battery CV mode

I am working on lithium ion batteries charging(NMC chemistry, max charge voltage is 4.2). In charging mode after cell reaching 4.2V, charger is going to CV mode and after this Charge ends(based on ...
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Damaged Bosch battery charger IC identification help

I accidentally damaged my Bosch cordless drill battery charger by hooking the charger's PCB's 12 volt lines directly to the 220V|50Hz AC mains. The charger's model is AL 1110 CV https://www.amazon.co....
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Does a USB PD source supply any voltage to a non USB PD compliant USB C device? If yes, how much?

I have a 40W USB PD compliant charger from my ultrabook. I recently bought a pair of headphones (Sony WH-1000XM4) which can be charged using a USB C Plug. Sadly I can not find in the specifications of ...
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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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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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57 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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1answer
56 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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36 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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69 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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42 views

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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54 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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56 views

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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53 views

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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34 views

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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50 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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62 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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47 views

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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51 views

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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140 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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28 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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64 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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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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34 views

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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51 views

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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51 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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147 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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80 views

Why don't the current readings 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 13 mA. 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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59 views

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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67 views

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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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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60 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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