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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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21 views

Programmable Charging controller for Li-ion/Li-Po [on hold]

I'm looking for a programmable charging controller (or set of ICs), that resembles laptop battery controllers. It will go inside of a battery pack with a small MCU and EEPROM. Critical features: 0) ...
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2answers
52 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
32 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
40 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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0answers
31 views

Touch screen smartphone stops working during charge [closed]

Goodmorning everyone, I'd like to ask a question about a fact that happened yesterday. While I was charging the smartphone through an "unofficial" charger, I've noticed that the touch screen stopped ...
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1answer
32 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
36 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
687 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
120 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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0answers
19 views

Charger and inverter wired in parallel

I have two large lead-acid batteries (208ah) that I’ve acquired. I’d like to connect a float charger to keep them charged and at the same time connect an inverter to run a few select loads. Normally, ...
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0answers
49 views

How to connect inverter fets during inverter charging

av constructed an inverter and I need it to also charge the battery, I would like this to work without using the bridge diodes during charging,anyone to tell me how to connect the fets during charging ...
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1answer
31 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
80 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
42 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 ...
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0answers
25 views

USB wall charger current question [duplicate]

I have a USB wall charger with this text on it: INPUT: 100-240V 50/60Hz 0.5A OUTPUT: 5.2VDC 2.0A 10.4W I'm building a circuit I want to power via USB and I calculated it would sink 500mA from ...
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2answers
63 views

What happens when devices request different voltages from a USB hub? [duplicate]

I'd like to charge two devices with one USB charger, one requests 5V, the other 9V. I plug an USB hub (potentially an old USB 2.0 one) in the (9V capable) charger and plug the two devices in the hub. ...
1
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1answer
53 views

Using B0505 for connecting phone chargers in parallel

I am planning to charge four 18650 Li ion batteries that are connected to four TP4056 in parallel making 4 amps in total to charge them in their usual rate. I was thinking of connecting two 2 amp ...
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1answer
36 views

Whistle while charging small cell phone power bank

I've one of those small batteries used to charge mobile USB devices like cell phones when there's no accessible power outlet around. It's a Cellularline FREEPSLIM3000 model HY-L-3000. Last time I ...
1
vote
1answer
74 views

What's causing the audible 7/8th rhythm in Qi chargers?

I have a wireless Qi charging system for my mobile phone. When I put the phone into the cradle it starts getting charged and I can hear a very quiet noise coming from the arrangement. Other ...
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3answers
50 views

Does a plugged in 12v usb-charger use energy when no device is connected?

I hard-wired a 12v cigarette-plug into my a-pillar. The whole point is to have an additional phone charger on the leftside where my phone mostly sits. I connected it directly to the battery ( with a ...
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0answers
67 views

LiFePo4 over-charge protection for automotive system

I have been looking in to the topic inferred by my subject line of late as I work on a 1980 Suzuki motorcycle's electrical system. I'm looking to use a LiFePo4 battery in place of the stock AGM to ...
1
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1answer
47 views

USB UART Bridge with capability of handling fast charge VBus

I am trying to design a charging circuit which support QuickCharge but also I want to add USB-UART bridge to communicate with on board MCU. How can I establish voltage level safe communication ...
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2answers
279 views

Correct charging current for lithium-ion batteries

I am trying to replace a lithium-ion battery for my Bose QuietComfort 35 headphones. I cannot find the datasheet for it. The battery is an AHB110520CPS (AHB110520) by Synergy. It is supposedly an "...
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0answers
19 views

3S LiPo Charger and Balancer CIRCUIT request

I am in need of a circuit that can charge and balance a 3S1P 1000mAh LiPo battery @250mA. Does anyone have one of know of where to find one? A little bit of project background: I've been messing ...
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1answer
44 views

Connecting a Solar Panel and Power Supply in parallel, in order to power up a load

I am using a Solar Module to charge a LiPo battery. The current supplied by the solar module goes into a battery charger IC and from there to the battery. This works fine. Now I want to add an ...
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0answers
17 views

DS2715 Sense Resistor Problem

I've build a PCB for charging a stack of 8 NiMH-Batteries and supplying a second board using the DS2715Z+. So far the charging works fine but I face a problem with the sense resistor. When I unplug ...
1
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1answer
85 views

NTC thermistor series/parallel resistor calculation for MCP73833 linear Li-Ion charger

I am using MCP73833 which has the following datasheet https://ww1.microchip.com/downloads/en/DeviceDoc/22005a.pdf Internal diagram as follows: They says that "An internal 50 μA current source ...
1
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1answer
51 views

Charger, load sharing and Fuel gauge

I'm designing a battery powered circuit where I would like to charge the battery via USB, and monitor the remaining battery capacity during operation. I'm using the following IC's: MCP73831 (charger)...
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1answer
52 views

How to tell a battery's ideal charging voltage with a circuit?

simulate this circuit – Schematic created using CircuitLab I've been looking to build a universal charger for my laptop and phone, and I'm wondering; is there a viable way to adjust the input ...
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2answers
53 views

What should be the V specs of a step down transformer for a 10amp car battery charger

I was looking to create a 10amp manual charger with variable voltage and current option for flooded lead acid battery (normally used in cars). I only know some basic electronics and usually make ...
2
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0answers
145 views

DIY 4S Li-Ion battery pack

I am in need of some help designing my battery pack. I have a few concerns, mostly around charging. My plans consist of using a microUSB boost converter to bring the voltage to 16.8V for charging. ...
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1answer
42 views

Does a 3rd-Party Cable cause any harm when charging your Phone with the original Power Brick? [closed]

When using the original Power Brick the Smartphone came with to charge it, does a 3rd-Party cable cause any harm to the device or is there no difference to using the original cable?
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1answer
36 views

what extra circuit to make a LiPo charger to a LiPo charger can sharing load?

As a (LiPo charger)(Charger A), I refer to this (LiPo charger can sharing load)(Charger B), this So, I have a LiPo battery with protection module. Can I just connect the LiPo and a LOAD in parallel ...
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4answers
127 views

Connect 90w charger in a laptop in which the charger was 130w [closed]

Is there any permanent damage on the battery or another part if i used a 90w charger on a 130w laptop? I need to do this, because my new 130w charger arrives only day 9 and I must continue using the ...
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4answers
4k views

Why doesn't my computer USB port break when I plug in a 2A device?

For typical AC to DC power adapters, I understand that the device draws the current it needs from the adapter. If it pulls more than the adapter can supply, this can cause overheating and lead to ...
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2answers
140 views

Why does my phone charger consume more electricity (watts) when delivering less amps (slower charging)? [closed]

As far as I could understand, the charging speed is measured in amps. Like, if I use Ampere, it will tell that it charges in 2.5 amps, or 1.5 amps. I hope I got this right. Amps is the only ...
1
vote
1answer
170 views

USB type-c power supply (up to 20V 5A) from DC source

I have a custom made 5s power bank (30 x 18650 cells) and I want to make a power supply to charge my laptop using this power bank. It's not a big deal to make a 5V charger because I just have to hard ...
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1answer
58 views

Charging a device with higher amperage, can somebody please clear up the confusion and contradictory statements?

I have a PS Vita I wish to charge with my Samsung Galaxy charger, its output is 9.0V = 1.57A which is for fast charging (correct me if I'm wrong) and thus won't handshake with the Vita so won't supply ...
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1answer
32 views

Frequently interrupting the CC charging stage of a Lithium-Polymer battery

Because of design constraints I need to charge a 2S Li-Po battery over its balance connectors using a single-cell charger IC (e.g LTC4002). In order to allow the user to interrupt the charging process ...
1
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1answer
550 views

Can I safely parallel 2 separate 18650-based Li-Ion battery packs, each with their own BMS? [closed]

I have a couple of 18650-based 10S2P 36V nominal 4.4Ahr Li-Ion battery packs from my electric skateboard which I'd like to permanently put in parallel to double my range and improve my power during ...
0
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1answer
103 views

TP4056 & resistor at VCC

Could someone please explain me what is the 0.4Ω resistor at the Vcc pin (yellow color)? Why it is surrounded by a dashed rectangle? Should I add such kind of resistor when I design my circuit?
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1answer
193 views

What voltage does a laptop provide over USB C?

I have read a bit already about USB C specification. One thing is not clear for me though. Please take a look at this picture: A device with profile from 1 to 5 can provide a higher voltage on the ...
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0answers
15 views

Odd behavior charging Apple products from 5vdc [duplicate]

I'm designing a PCB for a product, and this product will incorporate a 5vdc USB-A output to charge other devices. To get a sample of what current different devices will draw from a non quick charge ...
0
votes
1answer
102 views

Load causes voltage collapse. Why?

I have a circuit where a typical 3.7V LiPo battery supplies power through a bq24074 Charger IC, which should in theory short that voltage straight to the output of the charge-protect circuit, which ...
1
vote
1answer
119 views

How to design a circuit to disconnect battery charger automatically?

I want to use an AC to DC 14.4v adapter to supply both my circuit and its battery. The circuit works with 12v and I used a battery during power outage(blackout time). I have prepared the below circuit ...
1
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1answer
57 views

How does a ranged voltage battery charger work?

I'm wondering how a battery charger works that can take different voltages. For example Panasonic EY0L81 with voltage range frlm 10.8 - 28.8v, how does it identify which voltage to charge?. I also ...
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2answers
70 views

What would be the safest method to power a laptop (IdeaPad 510 15isk) from a 14.8v battery pack?

Looking at my existing power jack and measuring it crudely with a cm ruler it looks like 3mm diameter x 1 cm length. The laptop bottom and charging adapter both say 20v @ 3.25 A max. What would be ...
2
votes
1answer
240 views

How to efficiently charge 48V battery-motor system with solar panels

I'm wondering how to efficiently charge and use the following system with standard 18V solar panels: 48V lead-acid battery 1kW electric motor To charge the battery with either PWM or MPPT, the solar ...
1
vote
1answer
116 views

Li-Po charger booster circuit

I'm trying to design a simple circuit that has the ability to charge a single cell Li-Po battery and can be used as +5v power source. I chose the circuit from here. It seems that when ...
0
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1answer
48 views

Charging Lithium ion battery with a modified charger

I've a defective charger for a small LED torch light, its output is 4.2V / 500mA. I may not find an alternative one, so I'm considering modifying a mobile phone charger as following: The mobile ...