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Questions tagged [charger]

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

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15 views

Combining powerbank outputs: powerbank for laptop charger [on hold]

I would like to use my powerbank (Anker Powercore+ 20100 mAh) to charge my surface pro 2 while on the go. I know, popular question--and I think I have most of it figured out-- except for one ...
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3answers
35 views

phone charger residual electric flow

Not actually sure if this is too simple a question for this exchange. Just now I picked up my phone charger and unplugged it to move somewhere and plugged my phone in to the recently unplugged (from ...
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0answers
18 views

Solar Panel (5v/500mAh) charging USB Power bank (5v/1a)

I've been trying to find information on this but haven't found an accurate answer. I have a USB Power Bank that has a max charging input of 5v/1a and a 5v/500mAh solar panel that can output up to 5-...
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1answer
32 views

BQ2002 NiMH Charging Circuit not working

I have the following charging circuit based on the BQ2002 which will charge a NiMH battery using a 5V micro USB cable. I built the circuit already and noticed that the TIP32C is not getting hot and ...
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0answers
20 views

How Fast / VOOC / Dash charging works? [closed]

A battery can be modelled as Equivalent series resistance. So Battery connected to a charger is similar to a resistor connected to a voltage source which draws constant current. Will the type of ...
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2answers
59 views

LTC4054 Odd behaviour

I have included a LTC4054 IC in my project and here is how the circuit is. I purchased it from here The schematic is uploaded on github. The chip has 5 pins Pin 1 CHRG- connected in series to a ...
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0answers
15 views

Single Cell Li-ion/Li-Po Battery Charger IC [closed]

We have requirement for the single cell 3.7V Li-ion/Li-Po battery charger with inbuilt over charge and discharge protection. And we also need the Buck and boost converter for the regulated output ...
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19 views

MP2617H charger efficiency problem

Here's the layout. 2A charging seems OK, but the chip is very hot. The power dissipation of all the circuit is about 2W. Surprised. I check the voltage between SYS and BAT, it varies from 0.2v ~ 0....
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59 views

Transformer rewind Schumacher charger

Have been considering rebuilding the transformer in an older 200A Schumacher (auto) battery charger/starter. Some time ago, the transformer itself began making an unsettling buzzing noise, then the ...
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1answer
35 views

Designing QuickCharge device

I want to make an ultimate powerbank for my biking trips. This involves accepting a dynamo input and slow charging the battery pack with its ~3W and also cramming as much energy as possible as fast as ...
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0answers
15 views

Does BQ24195 charger detect USB modes DCP, CDP, and SDP by itself?

I use a BQ24195 chip as a charger. The datasheet is available here: http://www.ti.com/lit/ds/symlink/bq24195.pdf I need to identify if the USB is connected and if it is connected, in which of the ...
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1answer
88 views

Can I connect laptop charger directly to battery connector? [closed]

I wanted to ask you if I can connect my laptop charger into the battery connector? The reason is because I cannot charge my laptop and its cost too much to fix it, but the laptop working fine if it ...
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19 views

Circuit component controlling charging current [duplicate]

I wonder how the circuit of a typical 5V phone charger looks like. In the figure given below, I sketched how I imagine it. Using this setup, could I control the current drawn by the phone by selecting ...
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1answer
48 views

What happens when a Cap fails?

I am trying to understand What happens when the Electrolytic caps fail at the input terminal of a charger? What about at the output of the bridge rectifier? These two caps below are rated 100uF @ 200V....
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2answers
62 views

Why can't I replace conventional batteries with rechargeable batteries everywhere?

In two cases, I experienced that a device does not work, or does not work correctly, with rechargable batteries, while one-way batteries do the job. Can that be, and if so, why? The two experiences ...
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1answer
49 views

Can I charge this li-ion battery with this solar panel setup? [closed]

Since a couple years I've been messing around with a raspi and some motors. Building random stuff with dc-motors and such. I now want to power a self driving boat-robot with some solar power. For this ...
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2answers
55 views

I cannot se how the device is a buck charger when charging and a boost on the output

I cannot se how the device is a buck charger when charging and a boost on the output. Am I stupid or is the datasheet wrong? "5A Single Cell Li-Ion Switching Battery Charger with Direct Charge, Power ...
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1answer
41 views

Ouput resistance of a charger

I want to measure output of a charger (MODEL: GB28-25126) with below picture: When I connect my HIOKI multi-meter (3280-10F) to output of my charger in order to measure the resistance, it shows OF (...
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88 views

Solar charger for lithium batteries

I am trying to build a 2s 7.4V solar charged lithium battery pack to power an arduino UNO and SIM900 GSM shield. I have a 12V, 10W solar panel, BMS protection board and a DC-DC CC CV buck converter ...
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0answers
34 views

MCP73831 stat pin current

I'm trying to implement a bi-color LED connected to a Microchip MCP73831 battery charge management controller, so I can switch between red and green LED output. Currently my circuit is mixing them ...
2
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2answers
72 views

Smart charger - how to detect current and voltage of different battery packs and then charge them accordingly [closed]

I am thinking of designing a smart charger for a few of my bikes/scooters, etc detects current and voltage of the pack (30-60V, 1-5A) charges the pack accordingly in the CC-CV mode, fast-charging ...
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0answers
14 views

bq24171 battery charger does not charge

I want to make a 2S LiPo battery charger. I used the bq24171 chip from TI and followed the datasheet. All the conditions to enable charging seem to be ok but there is no actual charging (no output ...
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1answer
88 views

How does one charge a 37-volt lithium battery? [closed]

I have removed a 37-volt lithium ion battery from a self-balancing scooter for a robotics project. I retained the PCBs of the device for charging the battery. Unfortunately, the electronics appear to ...
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3answers
173 views

Lithium-ion battery charger circuit design [closed]

For my project I need to charge a 2s, 7.4V LiPo battery pack from an 18V 10W solar panel. This would not be an issue if I was able to use ICs such as the BQ2057WTS, but I am required to do design a ...
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3answers
1k views

Charging phone battery with a lower voltage, coming from a bike charger?

Since travel by bike a lot, and use my phone very often during those trips, I tried designing a USB phone bikecharger that would use my bike-dynamo that also powers my lamp. Yesterday, I did my ...
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2answers
54 views

Use lithium ion car jumpstarter to charge netbook? [closed]

I have a Gooloo car jump starter pack. https://www.amazon.ca/gp/product/B06X9R8QSY Can I use it to charge a small Gateway Nav50 netbook? What kind of adapter would I need? I suppose I could use ...
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3answers
169 views

Why is a laptop power supply output voltage different from its battery?

I hope you will not mind answering. This question has long been on my mind. Normally, the adapter output voltage is higher than that of the battery. In my laptop's case, the output voltage of the ...
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0answers
24 views

Responsible Battery Reserve Capacity and Low voltage?

It's been asked here, but looking for clarity. How bad is it to undervoltage a 12-volt lead-acid battery? SLI automotive starter batteries list RC (reserve capacity), but I think this a usable ...
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4answers
152 views

What will happen if I use laptop charger (3.42A, 19.2V) to charge 12V battery? [closed]

The battery's voltage normally is 13.8V when it fully charged. Say I have 5.7Ah motor bike's battery. The laptop's charger will be connected to a battery. The positive port of the charger to positive ...
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1answer
83 views

MCP73871 Battery Under Voltage Protection

I want to use MCP73871. Is there a battery under voltage protection in this charger IC? or may I use a battery protection IC? Answer for @Bimpelrekkie I decide to use my power architecture as ...
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1answer
77 views

How many 1.5V batteries can I charge simultaneously in series?

I'm wondering if there is a limit in terms of how many batteries can I can charge simultaneously ? I would like to charge 30 batteries at the same time, they will all be in series. Will it work ?
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Balance charging lipo cells with balance charger

I like to build a 14.4 v batterie pack from 4 x 2 lipo cells. But the balance charger can only handle 6 cells. In videos it looks like as if the balance lead is connected between two cells. So that ...
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1answer
44 views

E-bike battery needs custom charge voltage, but how?

I thought I'd give my old e-bike an upgrade, and I've build a 8S4P battery with charge controller (BMS). The thing is the electronics of the ebike quite working @ 31.5 V - a fully charged 8S battery ...
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0answers
40 views

Do I need a cut off circuit for my battery

Do I really need an auto cut off circuit for my battery when my charger only outputs 13V and 1A at max. The battery I want to charge is a 12V 7Ah Sealed Lead Acid. I heard that the cut off for lead ...
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3answers
164 views

Charging 2 12V batteries with a 19V 3.42A laptop charger

I was wondering since the voltage of my laptop charge is too high to charge one battery, it occurred to me if it could be possible to make a parallel or series arrangement to get my 2 12V batteries ...
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1answer
28 views

Cordless vacumn charger rating calculation

I got a cordless vacuum whose charger got damaged and I found a "close enough" replacement. What could be the new charging performance that I can expect or how can I do a calculation to determine the ...
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1answer
36 views

When a power supply has multiple stated output parameters, are those discrete output settings or some possible settings along a continuum? [closed]

Let's take my 30W USB-C Apple power supply as an example: https://www.apple.com/shop/product/MR2A2LL/A/30w-usb-c-power-adapter. Printed on it are 4 outputs: 20V / 1.5A 15V / 2A 9V / 3A 5V / 3A Are ...
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0answers
33 views

How to solder a trrs 2.5 cable to an old charger

I need to solder a trrs 2.5 cable to an old nokia charger, so I can charge my JBL E40BT headphones. My problem is I got the cable from an old set of earbuds, and I don't know what cable goes welded ...
2
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1answer
68 views

Why is there a maximum charging current much lower than maximum discharging current on a li-ion pack?

I will have soon an electric scooter with a 60v (top 67.2v) and 35ah battery pack. As it is designed, it can be charged by one charger which pumps 2,5 amps or it can be charged by 2 chargers in ...
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2answers
91 views

I want to make an auto power cut off for my battery charger

I have a charger for a 12v battery but it is without auto power cut off. I know I need a circuit consisting of a comparator and a relay and I drew the circuit but I don't know if there is something ...
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2answers
174 views

How to use CC/CV Charger with a DC/DC converter

I am searching for a solution to charge a battery pack (7S1P)[ICR18650] with a charger with CC/CV mode and I have a BMS for protection (I've done research to maximise the security of the battery pack)....
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1answer
40 views

How to deactivate Li-Ion battery charger

I have a USB device, which does have a Li-Ion internal battery in it. The device charges the battery when plugged into a socket. However, I don't want that battery to be used at all, I do prefer that ...
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1answer
85 views

Is less than 1A enough for TP4056 module to charge one battery?

I want to charge 3 separate 18650 cells with one charger. Each one of the batteries has their own TP4056 module. So in total there are 3 TP4056's. I know that TP4056 is rated at 1 amp input, though my ...
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1answer
41 views

Power supply design with charging circuit

I am designing a GSM modem power supply circuit. The circuit requires a 2A power supply. The module SIM800C itself can be powered directly by Li-Ion or Li-Poly battery power. I am looking at a ...
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0answers
44 views

How to charge Lithium Ion with protection circuitry

I am trying to build a charger for the Ctr 003 battery for the Nintendo DS. This battery has 3 outputs, which I call +, 0, and - for simplicity. When I measure voltage from + to -, or from + to 0, I ...
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2answers
752 views

Is it possible to convert 19.5V 3.33A to 12V 5.5A?

I have a laptop charger which has 19.5 V 3.33 A output. I want to use it for raspberry, which needs 5V and 2.5A and for monitor which needs 12V 3A. Is that charger strong enough to run the whole ...
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2answers
131 views

Any trick to use the ground pin? [closed]

I have bought a new charger for my laptop. The case of my laptop is made of steel and so it sometimes give electric shock as I don't have a ground wire in my house. And, I currently don't have any ...
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1answer
40 views

Emulate Li-ion battery using a charger

I bought an iPad with dead battery (it’s bulged). When I connect it to a charger, the only result is a boot loop (Apple logo, blink, Apple logo, blink…). I want to use it as a kind of picture frame, ...
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2answers
89 views

AC voltage on the outside surface of micro USB charger cable

My micro USB mobile charge cable is having about 98V AC voltage on the outside surface. (PFA measurement image. The black probe is connected to the Power socket Ground port. I could not take the whole ...
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1answer
117 views

How do I know if TP4056 charging modules are faulty

I've bought 10 of TP4056 Lipo charging modules from a Chinese vendor. Tried using them in something I've built, but whenever I plug the power source in, the charge led doesn't light up. In fact it ...