Questions tagged [charger]

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

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73 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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40 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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Using an ac adaptor for a dc only tv [closed]

I have a 12 V 1.4 A max dc only TV. How do I get the right ac to dc adaptor for it. I have a ac to dc adaptor for another TV but I am afraid it might blow the solar TV if I use it.
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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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32 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 battery will be coming ...
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16 views

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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1answer
25 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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1answer
78 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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2answers
55 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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53 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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1answer
71 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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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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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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3answers
65 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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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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48 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
48 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
47 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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63 views

Connecting multiple chargers to a lead acid battery

I have a scenario where I want to connect an external battery charger to an alarm system's battery to keep it charged fully despite our country's frequent rolling blackouts. The battery is a larger ...
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3answers
64 views

How to drop 5v regular phone charger voltage to 3.7v to run a device, which use 3.7v output battery before

I have Motorola Moto 360 2st edition smartwatch and watch original battery is dead. I have converted smartwatch into table watch in DIY wooden block and added 18650 3.7v battery instead and now its ...
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48 views

Charge a car battery from 14V 20A Max - how to limit current?

Could anyone point me in the direction how I would make a circuit to charge a large car battery from an alternator (say 12.5 to 14.5v) depending upon state of charge of the main battery, but it needs ...
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1answer
135 views

Electric shock in water [closed]

In my country, someone died recently due to an electric shock when their smartphone fell in a bathtub. I'm trying to understand what's going on the charger side when a poor quality cable used to ...
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1answer
66 views

Charging a Li-ion battery with a Buck Convertor & ATmega8 [closed]

I'm trying to charge a 7.4 V Li-Ion battery following the CC/CV protocol and have a few questions. I want to use an SMPS from my old laptop that can provide 20 V/3.25 A and feed that to a buck ...
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2answers
107 views

Why touchpad starts acting weird when connecting a cheap USB-C charger?

I recently bought a cheap USB-C power delivery charger and 2m USB-C cable for my Surface Go. When I connect it, everything seems to work fine, it charges at full speed, etc, but there's one weird ...
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Is the SkyRC B6 Nano charger suitable for charging single 18650's from 2.4v-2.6v

I have salvaged six 18650's from a laptop we've owned for years. Battery voltage: four of them are ~2.63v, two are ~2.46v I have a SkyRC B6 Nano charger (https://www.skyrc.com/Charger/B6nano). I've ...
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25 views

Power Jack part number for YAESU FT 23R battery pack?

I am planning to design a small USB powered charger for the battery pack used with the radio YAESU FT 23R. I have been searching for the correct name / part number of the power jack connector shown in ...
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1answer
55 views

Run a simple AC motor with batteries using a wall charger for double and triple A batteries as the inverter

I'm trying to put an electric motor on my bike going from gas to electric and was wondering if somehow I could use a normal battery charger that charges my triple and double AAA batteries as an ...
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36 views

Unstable Lower And Upper Voltage Charger Wall Adapter For Charging Battery

i have 2 charger adapter and both of them i testing with usb meter tester Charger A : Showing 4.92V-4.96V (the number keep moving ups and down between 4.92V-4.96V when high load) Charger B : ...
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USB C 2 wire, how it works & Connector repair

I wanted to repair an usb cable from a charger which can output 3A max. So on my charger cable, I got 3 wires. I got another USB C cable which can support 3A (USB-A to USB-C) and it only has 2 wires. ...
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Inside of Apple USB-C Charging Cable Layout

I wanted to connect Apple Macbook's 87W USB-C charger to a XT60 connector, which just needs ground - and power +. I'm guessing that the 3 reds are all powers thats why they are all together, the blue ...
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Red LED on TP5100 Li-Ion charger constantly on without charger connected

I have two 18650 batteries connected to a BMS which is wired to the input/trigger of a power drill as well as to the output of a TP5100 charger. Everything seems to be working great. Except: The Red ...
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1answer
37 views

Diode for 200v charging of ev battery module

Im attempting to use a DC power supply to charge a 200v battery module. I realise the power supply is not "smart" and I do not plan on fully charging the module. Long story short, I just need to ...
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1answer
83 views

What is happening when I apply 5V DC to the DC end of a 12V AC to DC adapter? [closed]

The question is in itself a little bit confusing but I will try my best. So I have a normal 12 volt (1 amp) AC to DC wall charger, nothing fancy about it. I use that to power a fan, which works great ...
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2answers
58 views

Charging a Phone With a Lower Current-Rated Power Supply

My friend's iphone charger exploded. She was charging an iPad with it. Since the iPhone power supply has a current rating of 1A while the iPad charges with a 2A current, many are blaming her that she ...
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1answer
102 views

Charger Delta Electronics ESR-48/40A E Voltage and Current Adjustments

Does anybody know how to change (i.e. program) the output voltage and limit the output current in the Delta Electronics ESR-48/40AE charger? The following web pages: this one and the next one have ...
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2answers
55 views

Coupling DC adapter and battery

In the picture below, I am connecting a constant power resource and a battery to each other by a lipo charger. The circuit should consume power from the adapter (NOT battery) while it is available. ...
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1answer
83 views

High power opamp-based constant current source circuit

I am currently working on a high-power 28S lithium-ion charger for EV. I'm on a constant current stage, so you don't have to worry about all that balancing thing, I just want a constant flow of 15A ...
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1answer
44 views

Upgrading Bluetooth earbuds case battery

Recently I got Chinese true wireless earbuds called Redmi AirDots. It has 3.7V 300mAh Li-Po battery in it's charging/carrier box that I want to replace with the one with higher capacity. I opened the ...
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1answer
49 views

Charging battery with external charger while powering load

I am building a device which I would like to be able to charge with several different types of external battery chargers (different Icharge within spec of battery, of course). If I understand ...
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2answers
81 views

Slow usb charger for my smart phone? [closed]

I read that the optimal charger for smartphone batteries is 3.92v (to reduce degradation). Is it possible to implement a system that allows an external "charger" to cause charging to stop at this ...
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1answer
72 views

Can I charge a lipo battery using piezoeletric energy harvesting?

I use a 9V 800mAh lipo Okcell battery to power my ESP8266 ESP-01 with a voltage regulator to change it to 3.3V. I use the ESP to detect the voltage peak from a piezoelectric when someone is running to ...
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3answers
64 views

36V DC charger with 12V DC charger and multiplier circuit?

Could I use a 12 V DC charger and and a voltage multiplier to achieve 36 volts? Are there any issues I might come across?
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1answer
70 views

Debugging a battery charger circuit

I have built a circuit of a battery charger here. Here is the circuit in the original project: However, it doesn't seem to work. The output I measure at the battery charging clips is only 1.2 V or so ...
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1answer
74 views

get 100mA pulses from 20mA source to charge li-ion

I have only 20mA in my circuit and after trying to charge a battery with TP4056 it doesn't work. TP4056 is a linear charger so I need to try with LTC4002 or even better to improve efficiency. Anyway, ...
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1answer
46 views

MCP73871 doesn't start to charge the battery

I use mcp73871 for charging LiPo battery. This is my schematic: Some settings: -charge current 100mA via R15 -charge stop current 10mA via R14 -Charge enable high -Timer enable set pull-up via R13(I'...
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24 views

Using a TP4056 with a 08570 Battery

Will a TP4056 (the ones with mini USB and no battery protection) charge a 08570 battery safely? From what I can tell the battery does have built in battery protection but I cannot find much ...
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50 views

How does an “auto voltage setting” laptop charger work? [closed]

I recently came across a very interesting device for me, a laptop adapter that claims it adjusts its output voltage automatically: https://www.trust.com/en/product/20194-plug-go-universal-90w-laptop-...
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2answers
191 views

tp4056 power consumption

I have replicated the li-po battery charger with the famous TP4056 , the protector DW01A and the mosfets FS8205A... exactly like the comertial board. I design a board that contains this circuit (and ...
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51 views

Charge and power distribution circuit with multiple batteries

I’m looking for solution for electric vehicle charge and power distribution system PCB. For some reasons I want to split battery to several Li-Ion packs in separated units (hulls). I see the next ...
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1answer
75 views

lithium 72v(2x 36v series) charging with double 36v charger For ebike project

Edit1: Voltage is wrong but here basic wiring diagram for paralel to series Changeover switch a diagram i found on internet closest to what i want i want to series 2 36v battery pack i know to ...

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