Questions tagged [charger]

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

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3answers
373 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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1answer
103 views

How do inductive chargers detect a load?

For a wireless inductive charger, I understand the basic operating principle. I have a question regarding the operation of such chargers when no "load" is "connected". How do they detect the presence ...
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2answers
537 views

What are the compulsory tasks of a charge controller for a lead acid battery?

Solar charge voltage regulators should coordinate the charging process of a battery. Suppose that I would like to design a very basic charging regulator controller with the following specs: The ...
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2answers
62 views

What does it mean when a charger supports n cells

I want to preface this by saying that I'm a beginner and this might be a very silly question but I've spent a while looking at datasheets and online forums and I still don't get this. I'm trying to ...
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2answers
625 views

Li-Ion battery charging as simple as possible

I have read articles here and there about charging Li-Ion batteries. Most of them try to solve the problem of maximizing capacity and also maximizing cycles. The most recommended method is charging ...
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1answer
684 views

Will a diode conduct if one side is floating and one side has voltage applied to it?

I have a circuit that has a battery output voltage of about 7V and can also have a charger input that when plugged in will output around 9V. The battery/charger power a microcontroller (regulated ...
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4answers
2k views

Battery-Operated Mobile Charger

I want to build a mobile charger that is battery operated and found this diagram. At first glance, this diagram looks kinda simple and I thought that this won't work. I'm a newbie on making this kind ...
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1answer
1k views

Efficient power utilization by MPPT battery charger

I am designing an MPPT solar charge controller to get more efficiency out of my system. At the moment I am at the conceptual stage and I have some questions about MPPT battery charging in general. ...
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4answers
24k views

Charging 2 Li-Ion Batteries via a single charger

I'm currently building a portable USB charger. It uses 2 Li-ion batteries in series connected to a USB port via a 5V regulated buck converter. While a single Li-ion battery would suffice for most ...
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1answer
9k views

humming of a mobile phone charger [closed]

Why do a mobile phone charger (without mobile phone attached to it) constantly hums when kept plugged into A.C. outlet and the moment mobile phone is plugged into charger, humming goes. Why so ?
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1answer
4k views

Can I use the output of mobile charger as a DC source for my circuit?

The title explains it all. Can I use the voltage and ground pins from the mobile charger and use it in my breadboard circuit? Is it safe? If it isn't, what is the thing I need to buy so as to convert ...
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2answers
2k views

Charging phones via solar battery chargers

For a school project, I want to make a solar iPhone charger (specifically for the iPhone 4) and I've spent about a week looking up stuff all over the Internet, and I'm stuck for the hundredth time. ...
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2answers
27 views

Battery temperature charging cutoff protection methods

We have run into a requirement where we need to terminate the charging of our Lithium Polymer battery when the battery temperature exceeds the manufacturer rated temperature. My immediate reaction is ...
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1answer
62 views

Is charger with USB C connector and 13V output in line with standards?

I have bought cordless rotary tool. The charger which is included in the package is equipped with USB-C connetor, and the charger has rated output at 13V @ 1.5A. Is this "legal" according to ...
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3answers
2k 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
52 views

Building a charger for a capacitor

I have a 5V DC supply that outputs at most 1.5A, and I want to charge a 25F capacitor (BCAP0025-T01) at 2.5V and close to 1.5A. How can I build a circuit to achieve this? Current mirror maybe? ...
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1answer
1k views

How to charge a 3cell 11.1V battery pack made out of 3 Nokia BL-5C?

I connected three Nokia BL-5C 3.7v 800mAh Li-Ion batteries in series for a robot project resulting in 11.1v @ 800mAh capacity. How do i charge the pack? Should i get a 12v 5A adapter and limit the ...
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1answer
290 views

BQ24650 or BQ24620 for LiFePO battery charger | Solar powered + Grid powered

I am designing a Battery Charge controller for our 12V LiFePo battery. Power input is: a. Solar Panel 80W @ 12V (Vopencircuit=21.33V, Vmaxpower=17.78V) OR b. 18VDC grid power. Either one power ...
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2answers
800 views

How can I vary the output voltage of a “smart” USB charger?

I have a Raspberry Pi 3 system that I need to be small, light, and portable. It uses a USB Wi-Fi adapter that plugs into one of the ports on the Pi. The adapter is quite particular about its supply ...
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1answer
914 views

Single IC for LiPo 18650 cell charger and boost?

I discovered USB power banks for a mere $1 (excluding battery) that seem to have an IC that handles everything from charging the battery to boosting output to 5v. It is apparently rated at being able ...
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3answers
336 views

recharge AGM batery with 3 phase charger and 277 volt power

I'm helping set up a system for a 3 year project measuring storm water runoff. This is my first project recharging batteries, any comments suggestions and questions will be very helpfull. We have ...
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1answer
1k views

LiPo charger with LDO regulator

I have ATmega328P circuit that drains from 0.1 to max 150 mA. Most of the time it's asleep (0.1 mA - with other little components attached) and once a minute it wakes up and drains 80 mA && ...
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1answer
63 views

Do I need any special equipment to make my circuit run off power from a phone/laptop charger?

Is it safe for one to replace a 5v battery source with a phone charger without installing any other components to prevent power surges or injury to any people in contact with the device? Also, is it ...
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1answer
743 views

LiPO reverse polarity protection with PFET & charger

I am trying to use a PFET to protect my circuit against reverse polarity like such: Now I would like to add a LiPo charger to this circuit. Can I just add it after the PFET (@+Vbatprotected)? Will ...
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1answer
715 views

Variable Current Lead Acid Battery Charging

I'm designing a solar controller in order to charge SLA batteries. I did some research on dedicated ICs that act as controllers, and found that most implement some sort of MPPT, in order to extract ...
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1answer
102 views

Will the charging current decrease due to a higher input resistance?

I am trying to design a board with USB powered linear battery charger IC charging a 3.7v Li-ion battery. I am concerning about the the relationship between charging path resistance and the maximum ...
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1answer
776 views

how can I hack a usb charger to work with ALL phones and specifications

perhaps I am asking for too much. Please do tell. So I have a few usb chargers laying around. I realised that in these chargers I can charge iPhones and I can ...
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1answer
879 views

How are these AA batteries 4500 mAh?

I found these two batteries in a drawer while looking for batteries for my wireless mouse. I was surprised to see that they are 4500 mAh, which is much higher than any AA battery I could find on the ...
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1answer
1k views

Power a laptop LED backlight with NiMH batteries

I'm powering a laptop LED backlight with an external 24,8V power supply, because I have problems with the internal WLED driver. The display used to work at 27V, but with the 24,8V of the power supply ...
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2answers
899 views

My voltage multiplier (cockroft-walton) will not charge my capacitor bank past 150v. How can I fix this?

I got 5 free 450v 4700uf capacitors that I put in parallel to form a 23500uf 450v capacitor bank (2.4kJ) in hopes of building a can crusher and later a railgun. I built a voltage tripler from four ...
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3answers
3k views

Method to lower voltage of a laptop charger

I bought an IMAX B6 LiPo Balance charger that needs as input 11-18V but I have an unused laptop charger (the laptop is gone) having 19V with 4.74A. What is the easiest method to lower the voltage to ...
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2answers
112 views

Why one transistor switches on first than other

In the circuit diagram given below we have two transistors. And in the article it is given that one transistor will turn on first. Why this transistor turns on first
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1answer
1k views

Powering circuit from 12V with stand-by battery + solar charger

I did some research but I haven't been able to find the information that I really want. I am building a home made security system consisting of several IP cameras. Brownouts are very frequent so I ...
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1answer
686 views

How can I disconnect a Battery Charger from the Battery while not Charging

I have a LiIon Battery Charger IC which will draw around 50µA when not needed, see circuit 1. This is a lot of current for no work in my opinion. Now I search for a solution how I can disconnect the ...
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2answers
2k views

powering +5v device with usb and/or battery

I made a PCB with an arduino clone and a tiny motor driver. The arduino clone itself needs +5 volt power supply, so I decided to use a DC/DC boost converter to boost a 3.7 volt Li-Ion battery to +5 ...
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4answers
588 views

Using the Maxim MAX1873

Here is a schematic of the "Typical Application" for the Maxim MAX1873 - Can anyone tell me what "To system load" means? Does it mean I can connect this to let's say a 12V door lock (my input is 15V)...
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1answer
779 views

Building a small D cell battery charger?

I am looking to buy/build my own D cell Nimh battery charger with the following requirements: -dual prong AC wall input -charges Nimh D Cell -is safe -contained within 1" x 1.7" x 2.2" enclosure As ...
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1answer
5k views

Increasing the Voltage Output of a Solar Cell

I'm working on a project where I'm going to charge a battery using a solar cell. The cell is capable of outputting a maximum of 4 A, but only 0.5 volts (2W). My question is, how can I charge the ...
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2answers
814 views

Why using short traces with the MCP73831 LiPo charger?

I'd like to use an MCP73831 to charge my lipoly battery. In section 6.2 I see they recommend short wires to the battery. I bought my battery with wires, 20 gauge and approximately 30cm long. The ...
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1answer
395 views

Is it safe to use the cable used in Portable Battery Charger and connect to the phone via the PC USB?

Every portable battery charger have a cable. That cable is usually connecting the PC USB port to the Portable Battery Charger so as to charge the battery inside the Portable Battery Charger. So, is ...
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1answer
141 views

Relay not switching immediately if mains off to battery like UPS

Relay not switching immediately if mains off to battery like as backup power. I'm looking for zero cross SPDT relay switching for my project. please help. design is simple two power sources (mains and ...
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2answers
55 views

Charging batteries with a PCB Charger

I have a 4 slot battery holder with 2 wires coming out of it, best I can describe it. I'm planning to get a 14.8V Li-ion PCB charger (of course this will be used with 3.7V Li-ion batteries). One thing ...
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1answer
118 views

How does this circuit work? (TP4056, DW01)

Why are capacitors C13, C12, R20 used here? And why resistor R18 and C5? (What function do they perform?) I don't understand why they are installed there. Datasheet: TP4056, DW01, FS8205A.
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1answer
160 views

Lithium Battery Charger using LM317

I have come across the following circuit in a datasheet for a battery charger: I have also seen a similar use of the charging circuit for use as a lithium battery charger, e.g http://shdesigns.org/...
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1answer
132 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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55 views

Finding Charge of a battery without knowledge of prior charge

We have a battery connected to some circuitry. Currently, we have all charging of the battery going through a LTC 2944 sensor, and all discharging going through another one of those sensors. We are ...
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1answer
40 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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1answer
598 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
237 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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1answer
693 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 ...

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