Questions tagged [charger]

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

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2answers
830 views

charge extraction from solar cells in low light conditions

This is probably not that deep a question, but how can one extract power from panels in low light? A 6V panel would dip to ~2V or so, and power output would sink lower. In conventional systems, how is ...
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1answer
1k views

Building a battery pack, how do I recharge it with USB?

I am working on a small 12V boombox project and trying to figure out how I should approach the power supply. I have some goals that I want to achieve: Should be able to be charged with an iPhone ...
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1answer
2k views

3.6V NiMH smart charger, microcontroller, auto switch over from DC in to battery

I'm working on an agricultural pump monitor project using a microcontroller. It needs to be able to operate ~1 hour after power failure, and signal same. I'm hoping there are maybe single chip, or ...
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2answers
907 views

Arduino shows voltage drop, voltmeter doesn't

I'm totally lost with the behavior of this simple schematics. issue http://img72.imageshack.us/img72/9421/issueh.png Once the charging process starts, Arduino's voltage reading becomes very different ...
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4answers
7k views

DIY NiCad charger

I have this Ryobi 12V NiCad cordless drill that was sitting in a drawer for the past 6 years or so due to dead batteries (2 of them). At least that's what I tought at the time but looking at it more ...
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1answer
640 views

Value of blown resistor in this simple lead acid charger, Please help if you can

I hope someone can help with this very simple circuit, I have traced from the pcb, my electronics theory has really gone out the window, The circuit shown is from a car battery charger and has a 2 ...
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2answers
95 views

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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2answers
32 views

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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2answers
96 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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3answers
65 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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0answers
76 views

How To Run Shaving Machine Without Bettary? [duplicate]

I'm just an amateur in this and I Need Help.. I've drawn this circuit of my Shaving machine and I want to remove the battery and connect it directly to one of these phone chargers-: The first: ...
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0answers
22 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
274 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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0answers
947 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
2k views

MPPT (LT3652) + Solar Panel Voltage

We are trying to charge a 3.7V LiPo 150mAh battery with a 30W 12V Solar Panel. The circuit we're using is a simple derivative the of the MPPT Solar Charger for Sparkfun's Sunny Buddy: Our circuit is ...
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0answers
296 views

Transzorb for MCP73831 USB LiIon Charger?

The datasheet of MCP73831 (a small LiIon charger device) recommends a transzorb on the USB power input (VDD) for input over voltage protection. See Section 6.1.1.2. Absolute maximum ratings for VDD ...
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2answers
325 views

Need to charge a lithium power pack from USB

I need to charge a small lithium power pack from a device that was originally charged using a 5v USB connection. The connector on the device is damaged so I need to charge the power pack directly. I'm ...
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0answers
2k views

How to charge LiPo battery using a wind generator?

For a home robotics project I want to fly a kite using a computer. For this to happen I need an electro motor up in the air (attached to the kite) which obviously needs a battery up there as well. ...
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1answer
263 views

Making a universal USB charger

I would like to make an universal USB charger. I have a 5V, 2A max generator and I can not find any electronic assembly to create a Dedicated Charging Port able to charge Samsung, Apple and other ...
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3answers
469 views

Buck Converter for 59V to 58V?

Some batteries last twice as long if they are kept to 80 percent of their maximum charge. It's good to add a small adjustment to undervolt a charger output by 0.5 - 1V. Myself i have a CC/CV charger ...
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2answers
790 views

Using a 48V Charger for a 12V load

My friend and I are trying to make sense of this. We have 4 12V batteries, a 48V solar panel charger/controller, but our load needs 12V. The system must be able to support a maximum load of 3000W, ...
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1answer
477 views

Is it safe to charge a Li-Po battery at a lesser C rate than its usual routine?

On my Quad Copter I have a 5400mAh Li-Po battery (3S 11.1V) and its charger charges at 0.5 C since it takes 2 hours to charge the battery. That charger has broken down, I have ordered a replacement ...
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2answers
2k views

Determining voltage of fuse

My car battery is dead, and the fuse in my car battery charger is missing....(don't ask me why) I have a 20A fuse lying around and a 7.5A fuse that I took out of the car. The car battery charger ...
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3answers
560 views

Rate my Rasberry Pi UPS

I've made simple schematic for a UPS for Raspberry Pi. It contains a 12V Lead Acid Battery (40Ah), 5V LM7805 regulator and some capacitors. I'm supposing max 1.2A load from Raspi. Should I add ...
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1answer
477 views

How to use a solar panel that has 'watts' to power a battery charger that requires: 3v & 2.8 amps?

I have a battery charger that charges small batteries ( AAA & AA ). It uses an adapter that gives it 3V and 2.8 amps. I want to remove the adapter and give it solar energy instead. There are ...
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3answers
9k views

How to efficiently charge a capacitor from AC source

I want to charge a capacitor at 200V DC from a 220V AC power supply (peak voltage = 311 V). Also I want no power disipation once it reaches full charge. This goes inside an equipment that discharges ...
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1answer
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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2answers
4k 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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1answer
49k views

Charging a 3.7 V with a 5V usb charger [closed]

For a project, I want to charge a lipo battery (3.7V @2000mah) with a 5V USB charger. I'm not into electronics, so I don't know if is viable to do that. So, can I charger a 3.7 battery with a 5V ...
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4answers
605 views

Watts used by chargers eg laptop, wall warts etc

This is my first question on here, its quite easy and I am sure I have half the answer, maybe. I was thinking about how much power was being used by these wall chargers etc, you read the label it may ...
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3answers
327 views

How safe is this?

I'm wondering how safe this is to make and to build into my setup. :P A bit afraid of it exploding. http://www.apartmenttherapy.com/make-your-own-batterypowered-u-100359
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3answers
8k views

Protecting diode bridge from higher current

I have designed a battery charger circuit. The circuit is simple AC to DC power supply circuit, it is composed of a 220 Volt to 16 Volt stepdown transformer, a diode bridge and a capacitor. Now the ...
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3answers
495 views

Charging batteries directly from 117 volt wall socket

It has occurred to me that almost no battery charger would be required if the battery pack was of the same voltage as grid supplied power. I build electric bikes, and the voltage on these has been ...
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1answer
22k views

can I use a 5v 1a charger with a 5v 2a device? [duplicate]

Possible Duplicate: Choosing power supply, how to get the voltage and current ratings? I have a new tablet with a charger that reads 5v 2a, can I charge the tablet with my phone charger, which ...
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1answer
777 views

What causes the opamp to become warm in this charger? [question updated]

UPDATE I just realized that I posted the bad version of my circuit. I now swapped the + and - input of IC5A using a utility knife and short wire on my PCB after realizing that I was making the ...
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3answers
594 views

Problem with LT3750 charging

I'm trying to build a flyback circuit to charge a 1uF cap to ~300, but am having a lot of issues. I'm just following the data sheet diagram for a 300V 3A charger (see pic below). I've never been able ...
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1answer
437 views

Different voltage between the solar charge controller and the battery

I have a solar "box" project with a 10 W, 12 V panel and I noticed something when I was testing the battery voltage (two 12 V battery in parallel). When I measure the battery voltage directly from ...
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1answer
3k views

How can I build a charger for this RC helicopter? [closed]

I have this remote controlled helicopter: http://www.clasohlson.com/se/Radiostyrd-helikopter/31-8071 Currently it is charged by connecting the remote control. However, since the RC runs on batteries, ...
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1answer
402 views

Prevent Mobile over charging?

This is my second time changing my mobile because I forgot it all the night on the charger. I know there is an IC or circuit inside my phone that will disconnect the charger once the battery is fully ...
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1answer
612 views

Identifying a four-pin IC labelled EL 8+7 G8025

I want to know the purpose of a component named "EL 8+7 G8025" which was found inside a Nokia charger.
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5answers
2k views

Will voltage or current determine a diode drop for this battery charging circuit?

I am using a li-ion battery charger IC that regulates an output to 4.2V. I have a schottky diode in series with the output that then connects to the battery. How do I determine the voltage drop? If ...
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1answer
9k views

Charging 7.4V Li-Ion battery

I'm making a battery out of two 3.75V Li-Ion cells to go into a speaker system that powers an amplifier. I was wondering on the PCM, how many volts would be max to charge these cells? The cells I have ...
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2answers
3k views

Can I use a 0.7A charger in place of a 1A charger? [closed]

One problem that I usually come across is the current ratings on mobile phone chargers. Right now, I need a 1A charger (which was shipped with my phone) and I have a 0.7A charger handy. Both the ...
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1answer
85 views

Looking for some solar panels to go with this project

I've been looking around for some solar panels for a little homemade solar phone charger project. I recently found a portable phone charger project from a student at Cal Poly which I'm hoping I can ...
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1answer
198 views

Lithium Ion charging problems - power outages

Does any one know if general charge circuits for lithium ion batteries suffer from this problem: -Flat Battery put on to charge. -A power outage of long duration occurs (say 8 hours). -When power ...
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2answers
3k views

Charge 3x AAA from USB

I'm trying to charge 3 NiMH/NiCd AAA cells from USB. I've already got an atmega32u4, so I can use that to read battery voltage and stop when battery reaches 4.2V. I'm not sure about the capacity, but ...
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1answer
31 views

can I charge battery at the same time as using it if it is the new usb c pd

Sorry for such a newbie question. I am still trying to find my feet. I know that a battery cannot be charge and discharge at the same time as I find this: No, a battery can't be charged and ...
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2answers
62 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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2answers
140 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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2answers
57 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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