Questions tagged [charger]

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

Filter by
Sorted by
Tagged with
2
votes
2answers
2k views

Solar Charge Controller as “UPS”?

I've been trying to figure something out for a while, and have experience with digital systems (logic gates, flip-flops, etc.), but not necessarily "real" systems (with Zener diodes, etc.) so here ...
2
votes
2answers
786 views

How to make USB smartphone charger? [duplicate]

I want to make a USB cell phone charger. I know USB operates in 5 volts which means i need to drop down voltage if i have battery potential greater than 5 Volts. I have 12 volts sealed lead acid ...
2
votes
2answers
820 views

How do I build a solar charger for my phone / other devices?

I have an HTC Incredible phone which eats a lot of battery, and a cy-fi speaker which I use with the phone. I'd like to charge them both while riding my bicycle, and I think the best choice is a ...
2
votes
4answers
281 views

Phone travel charger for powering circuits dangers

I am thinking of using a phone travel charger to power a circuit.Ratings: input:110-240VAC(my outlet has 220volts) 50/60Hz 0,3A output:DC 5,2volts at 400mA The problem is that 220 V are of course ...
2
votes
1answer
1k views

How to get 5V 4A from two 5V 2A chargers

I have two 5V 2A chargers. I want to get 5v 4A. Can I connect both in parallel like this?: simulate this circuit – Schematic created using CircuitLab Can I do it? Because in parallel ...
2
votes
1answer
195 views

Why are 5 Volt 7-8 Amps chargers not available for charging phones quickly? [closed]

Available phone s chargers have either 0.5, 1, 2 Amps rating depending on the batteries (varied capacity) used. Why is it that 7, 8 Amps chargers are not available ? if the limitation is in the ...
2
votes
3answers
667 views

Charging 12V SLA from Single Solar Cell

I'm interested in charging a 12V Sealed Lead-Acid battery from a single monocrystalline solar cell. The solar cell's voltage is only 0.5V at maximum power point, but it supplies 8A. I will need a 32X ...
2
votes
3answers
6k views

Why doesn't my solar charger work?

I did exactly as that picture showed, and I guess how it works is that it charges the AA batteries and then takes energy from them to charge something through the USB hole? Right? (I'm new to ...
2
votes
2answers
67 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 ...
2
votes
2answers
80 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 ...
2
votes
1answer
205 views

Sepic based charger

I have acquired a LT1512 Sepic based controller which is a controller for charging purposes. I have followed the datasheet as much as can, read few articles on how to set it up for my purposes, ...
2
votes
2answers
3k views

Can I use a charger to power a motor?

I working on a home pet project for which I bought a rather powerful moter. It is a 24V 90W motor, which says the "Load current" is 5.7A. I now want to power it with my wall power, so I thought of ...
2
votes
2answers
5k views

On an Apple 12W USB Charger, how are the D+ and D- lines configured?

Looking for the voltages on the V+ and V- lines of an Apple 12W charger that corresponds to the 2.4A output.
2
votes
2answers
868 views

Is this a viable mini wind turbine setup?

I'm going to build my first wind turbine. I have already constructed the prop, 5 blades 50cm long from PVC pipes. I've searched for a decent sized motor and charge controller. The turbine will be ...
2
votes
2answers
2k views

DC output of phone charger [duplicate]

I have a nokia phone charger which has the following specifications: Input: AC 100-240 V, 50-60 Hz, 100 mA Output: DC 5.0 V, 350 mA When I checked the output of the charger with a multimeter it ...
2
votes
2answers
1k views

Can I charge multiple devices from one transformer?

I am getting tired of bringing 3-4 power cables with me every time I travel and am thinking about building a multi-device power charger. In other words, this charger will have one transformer (and one ...
2
votes
1answer
71 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 ...
2
votes
1answer
326 views

480v Single Phase forklift battery charger wiring?

I recently have been asked to install a battery charger that came along with a forklift purchase. It is a 480volt 1ph charger. It has terminals labled L1,N,G. The plant is wired 480v 3ph, with 277v ...
2
votes
1answer
96 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 ...
2
votes
3answers
2k views

Evaluate and enhance my Super Capacitor Power Bank

I am not an Electrical Engineer, but know some basics from reading and practicing on this topic. Please evaluate my circuit for a Super Capacitor Power Bank to charge my phone, and clarify my points ...
2
votes
2answers
410 views

Charging time of lithium ion batteries

I am charging a 430mAh lithium polymer battery at 1C using BQ24232 charger IC (from Texas instruments). The charge terminates within 1 hour 20 min with battery voltage showing 4.17V. On research I ...
2
votes
2answers
763 views

Is the efficiency of (Qi) wireless charging affected by a metal surface?

I recently picked up a Galaxy S7 Edge and love it. I've also gone "all in" on wireless charging, now owning three chargers: a third party standard charger, a third party QC 2.0 (15W) Adaptive Fast ...
2
votes
2answers
5k views

Lithium Ion Cell balancing

I’m making a Lithium Ion charger circuit and successfully used a Texas Instruments bq2057c to charge 2 Lithium Ion cells in parallel (4.2V). Now I want to do the same with the cells in series (8.4V). ...
2
votes
1answer
2k views

Question on 3DS power adapters, minor voltage difference [duplicate]

I am going to be traveling overseas and bringing my Nintendo 3DS which the adapter outputs DC 4.6V 900mA. I found an unofficial USB cable to charge it and I was curious if the minor variance in the ...
2
votes
4answers
15k views

How do we charge a small 12V battery from a large 12V battery bank

In a youth organization that I am part of we are building a traveling stand alone system, which will be put up on various fairs and music festivals. On one of the festivals there is a wish that we can ...
2
votes
2answers
4k views

Emulating a USB Standard Downstream Port Charging application

I have am using an LM5017 to step down a relatively high voltage solar panel (VOC over 90V) to 5V. I have bench tested my circuit and it is providing good buck regulation with input voltages up to 95V....
2
votes
1answer
2k views

Risk of overloading a usb charger

I just bought this product: "Jackson PT1USB" as an attemp to get a portable charger for my netbook, ipad 2 and smartphone. Now I am bit worried after reading in the product "total connected load to ...
2
votes
1answer
2k views

Li-Po USB Charger with PIC, voltage is not falling to 0V

I am designing a single cell Li-Po charger with a PIC. I have this: I drive the transistors from a 12F PIC microcontroller. As you can see in the square wave on the top of the oscilloscope the signal ...
2
votes
1answer
129 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 ...
2
votes
1answer
123 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'...
2
votes
2answers
70 views

Why can a charger handle more watts at a higher voltage?

Why is it that my charger that has a rating of 100-240 volts and 1.3 amps can handle/input more watts at a higher voltage when doing the formula watts=volts x amps? In addition, why can't it, at a ...
2
votes
1answer
58 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....
2
votes
1answer
173 views

How does this battery charger from an emergency rechargeable light work?

I opened an emergency rechargeable light and saw the charger circuit which is quite simple: a bridge rectifier and then a big capacitor (I don't know the rating). There is no transformer, but the ...
2
votes
2answers
2k views

Smart Lead Acid Battery Charger Circuit - Is this practical?

I have thought of making a Smart Lead Acid Battery charger using the following schematic. I am not sure, if the circuit would work the way I am expecting it to, or not. My expectations are: The ...
2
votes
1answer
227 views

Oddly placed spark gap? Samsung phone charger (ETAOU10)

I was bored one day so I took apart an old (as in no longer needed, late 2013) phone charger. Everything looks well designed except for the spark gap between neutral/live and the low-voltage side. ...
2
votes
2answers
400 views

Failing LiPo charger circuit

Working with microchip MCP73831T chip to charge a single LiPo cell. We are producing by the 1000 unit and getting significant failure of the charger IC. I suspect we need ESD protection on the 5V ...
2
votes
1answer
2k views

USB port controller, divider mode and BC compliancy

There're many 'universal' chargers out there on the market which claim to support maximum charging for a range of devices from iPhones, iPads to Samsung Galaxy S5, S6, etc. There're USB charging port ...
2
votes
1answer
360 views

Charging appliances with chargers of different amperage (safety & duration)

Safety Will the battery or charger be damaged if I use a 1A charger to charge a 2.1A appliance? Will the battery or charger be damaged if I use a 2.1A charger to charge a 1A appliance? Duration I ...
2
votes
2answers
509 views

How to reduce voltage of a dynamo to 5 volts

A friend and I are going to make a bike-powered charger. There is a video of KipKay making one. But he uses a 12 volt 6 watt dynamo and there is a schematic that he follows to lower it to 5 volts. Can ...
2
votes
2answers
370 views

Make a Solar Powered USB Charger

I'd like to make a solar powered USB charger, to charge my phone. I'd ideally like to use (a) solar panel(s) that I can 'mount' onto a canvas messenger bag, and use a pocket to hold my phone. ...
2
votes
2answers
922 views

Arduino project, powered by car electric system

I want to assemble an Arduino project that would be powered by car, and also it should be power-independent to some degree. This project will be a simple car alarm system, with gps reciever and will ...
2
votes
1answer
2k 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 ...
2
votes
3answers
1k views

Buck/boost to charge lithium battery from solar and alternator?

I have a 105Ah 12V Pb battery in my 4x4 for the fridge, it is charged by solar panel or the car's alternator through a DC-DC charger connected to both. The charger is however only for Pb batts and I ...
2
votes
1answer
131 views

Charging Li-Ion string with cells of different capacities

I was trying to understand what is the worst case scenario of using a string of 4 lithium ion cells (18650 cells, 3.6V nom) in series to form a battery pack, without balance circuitry, to understand ...
2
votes
1answer
1k views

Li-Ion battery charging, termination current (ITERM)

How much does termination current (ITERM) affect the level of capacity in a Li-Ion battery? I mean, in a given capacity (say battery 3.7V 1000mAh) how much charged would a battery be when the ITERM ...
2
votes
2answers
1k views

Help me identify this small transformer

I have harvested a small transformer from a tablet's charger,but I couldn't really find the exact model. After searching the net,it was clear that the transformer belongs to the EF20 series,but when ...
2
votes
1answer
514 views

ATtiny measuring voltage for battery charger

Would it be possible to use adc with the reference voltage at ground, to determine the voltage of say a battery? I was thinking of creating a battery charger with the attiny for automatic cutoff and ...
2
votes
1answer
427 views

Li-Ion Cell Charger Tips:

I've recently been using an old cell phone charger as a single cell charger to manually charge 18650 li-ion cells. Below is some info about the charger & charging that I have measured. Charger: ...
2
votes
1answer
118 views

How do I use a 680 Volt (DC) solar panel with an off the shelf system?

I've inherited 4 custom built solar panels. These are not consumer grade panels but industrial sized. They produce 680 volts DC at 3.8 amps. The voltage selection was probably selected to minimize ...
2
votes
1answer
1k views

SIM908 Li-Ion charging with 6V solar panel

So, I want to know if I can hook up a 6V 2 watt solar panel to the Vchg pin on a SIM908 gsm/gps module and trickle charge my 6Ah LiPo battery that way. A little background... So, I have completed ...

1 2
3
4 5
15