Questions tagged [charger]

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

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123 views

Glitchy Touchscreen Caused by Charger extra question

In this thread Glitchy Touchscreen Caused by Charger the answer states it is from the USB charger not being rated high enough. I am using the Moto G 1st gen and upon using a charger rated for 5v 800 ...
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1answer
666 views

Parallel charger circuits

I'm constructing a power supply based on solar cells backed by batteries. The solar cells deliver between 0 and 4 A, depending on the time of day, while the charger I plan on using, the LT3652, has a ...
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1answer
905 views

How do I smooth current dips on a USB charger?

I've got a USB charger that I want to use to charge a phone. For about 35 seconds it outputs enough current for the phone to detect it and start charging, then for an instant (no equipment to read ...
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4answers
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Is it possible to make a usb charger to power multiple devices?

I was thinking how nice it would be to have a single wall plug with multiple (4-6) USB ports that would be capable of supplying enough power (at 5v) to charge say an iPad, smartphone, bluetooth ...
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1answer
5k views

USB to 3-cell Lipo charger?

I have a data-logger project that needs to run from a 3-cell Lithium Polymer battery. It has 5v and 3.3v regulators to provide regulated power to the system. I want to build the battery into the ...
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2answers
45 views

What does cell phone wall adapter specs mean? [closed]

On many (if not all) of my wall charger it says: INPUT: 100-240V / 0.5A OUTPUT: 5V / 2A So, according to my poor knowledge this would mean that the input power ...
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1answer
137 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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1answer
2k views

Coin cell battery recharging circuit for RTC backup power

I am designing a system that contains an RTC to for displaying the date and time on a user interface, as well as log events with time stamps. In this particular case, the system gets powered-on at ...
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1answer
2k views

Charge Li-Po battery with TP4056? (Or what else?)

I bought a single cell Li-Po battery and two different charger modules (one without protective circuit and one with protective circuit) from AliExpress. The Li-Po battery has a protection circuit ...
4
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1answer
381 views

Solar Powered MintyBoost

I've decided to try and make a Solar Powered MintyBoost. I've drawn up a very rough version of a schematic: As you can see, I plan to use a solar cell to charge a set of 2 D batteries (in series), ...
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1answer
790 views

Proper way to recover 18650 cells from laptop batteries [closed]

I'm looking for a tutorial on how to recover 18650 cells from laptop battery packs. Like what should I do, and what should I not do, how to test them to see their condition. The way I'm doing it now ...
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3answers
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Topology of solar PWM charger

I am looking into the design of the most simple (yet functional) PWM solar chargers for lead acid batteries. (Numerous examples can be found on Ebay for about 10 bucks.) I have a hunch that they ...
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2answers
922 views

Could smartphones benefit from the same charging mechanism as in electronic watches?

A long time ago I learned that electronic wristwatches have a charging device that draws energy from hand movement while the wearer walks. I don't know how much power a wristwatch generates but maybe ...
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3answers
3k views

Mobile phone battery charger

I would like to know about the workings of mobile phone battery chargers. I know the basic principle, you take a transformer to bring it down to 9/6/3.7 volts then a bridge rectifier circuit and a ...
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1answer
17k views

TP4056 Lithium Charger Module issue

Im having an issue with TP4056 Lithium Charger Module. Connected the battery 3.7v 150mah battery. When charging the red led is on but it never shuts off and no charge state is reached even after 1-2h ...
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2answers
2k views

Is there a reason GaN chargers stop at 65W?

During the last year or so we have seen commercial release of USB chargers utilizing GaN technology. For some reason it seems no products go higher than 65W. The Navitas reference platform was 65W, ...
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2answers
6k views

Why do chargers heat up when operating?

From my experience all chargers for Li-Ion batteries notably heat up when charging the battery. Why does that happen? Is the charger acting as a not that efficient power supply or is there any ...
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2answers
147 views

How to detect Corrupt Flash Memory? [closed]

I am checking PCB board of a commercial device that has W25Q256JV 32MByte SPI Flash on it. The device is in use for more than a year now at more than 2000 client locations. It has internal backup ...
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4answers
2k views

Charging supercapacitors with Buck converter. Do I need to cut power once charge is reached?

I am trying to build a supercapacitor charger, and as I don't particularly have a good handle on the risks of such a thing, I'm hopping on here to give some information. I am using a buck converter ...
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1answer
437 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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2answers
2k views

MCP73831 Li ion battery charger problem with load sharing circuit

I am building a device which is being powered by single cell Li ion battery (1100mAh), i am using MCP73831 Li ion battery charger and controller in my design to charge the battery. I am using below ...
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3answers
2k views

How to limit voltage charge of supercapacitor

For a DIY project, I plan to charge an 100F 2.7V Supercapacitor using a 3.7V Lithium-ion 18650 battery. However, I need it to charge only until 2.25V. Is there a simple circuit that I can build to ...
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1answer
2k views

Charge NiMH using TP4056

Is it possible to charge 3x NiMH AA (eneloops) in series with a TP4056 module? I know that TP4056 will automatically cut off charging when Li-ion reaches 4.2v. So 3x 1.2v Ni-MH = 3.6v, TP4056 ...
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1answer
1k views

LiPo use while charging: two cells (one charging, one under load)

I'm trying to figure out how to power my project using LiPo batteries and a solar charging circuit. The project will draw up to 2A at 3.3V. I did a search for IC LiPo charging chips that also allow ...
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1answer
50 views

Battery/Charger Not Reaching Float with Load Attached

I'm trying to add a backup/UPS to a system I have outside with the following battery charger - https://www.meanwell.com/Upload/PDF/ENC-180/ENC-180-SPEC.PDF . The DIP switches are set for AGM mode. My ...
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1answer
134 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 ...
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1answer
2k views

Switching between battery voltage and solar voltage to control load. in solar charger?

I designed a solar charge controller using arduino and MOSFET IRF9530. Main purpose was to charge 12V 7aH battery and then control the load. Here load is a solar ...
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1answer
4k views

Best Option for Charging a High Voltage Capacitor?

I was looking for a good option to charge my 450V 6800uF Electrolytic Capacitors. I initially followed the dc - dc booster path with a voltage divider comparator (op-amp) something similar to But ...
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1answer
8k views

How does my phone get charged via laptop USB port at lesser current (compared to wall charger) [duplicate]

Today's typical smartphone chargers are rated at 5 Volt & 1+ Ampere. The laptop USB can supply 500mA 100mA. Why is it safe to charge the phone with 1/2 the rated current? Is it like a slow ...
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1answer
3k views

19v Charger with 14.4v Battery: What exactly can I expect?

Long story short: I have to replace the charger AND battery on my ASUS U53F-BBL5 laptop due to a combination of lost original charger and Best Buy can't read a laptop's model number for the correct ...
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3answers
16k views

smartphone charger voltage rating [closed]

I have looked everywhere but haven't been able to find a decent answer. So here goes my question from the depths of my ignorance. I recently bought a solar-powered charger and battery pack for ...
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1answer
534 views

How can I build a solar powered car charger?

I found 12 solar panels, but they are very thin and fragile. They put out approximately .5V under an incandescent bulb. What would be the best way to turn these 12 panels into a 12V car battery ...
3
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1answer
96 views

Connection problems or burned chip?

I am assembling a board for a wireless charger based on this evaluation module (see here) I own a preheat bed, a hot air gun and a quality soldering iron. I am afraid that after soldering the chip and ...
3
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1answer
326 views

25A USB port blew up a TP4056

I have made a bench power supply from an old PSU and added a USB port connected directly to the 5V rail (leaving the data pins disconnected). When I connected a TP4056 charging board (like this), the ...
3
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1answer
1k views

Recharge AA batteries in device(skips taking batteries out)

In principle is it possible to recharge AA/AAA/9v batteries in the device they are currently plugged in? There are numerous smart chargers for AA/AAA and 9V batteries. The process requires taking all ...
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1answer
2k views

Questions about Li-ion battery charger and battery monitor chips

I want to build a system powered by 14.8v Li-po battery pack or mains power (selectable power path). When the mains adapter is connected, the battery will be charged and the system will be powered ...
3
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1answer
2k views

PWM lithium-ion charger

I want to make a custom lithium-ion 18650 standard cell charger as I will be charging 100s of them (recycling old laptop batteries). Base on my research, lithium-ion cells use constant-current, ...
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2answers
2k views

Solar MPPT charger causing regular voltage spikes

I have a van which has two 12V solar panels on the roof. The charger is connected to the batteries and seems to constantly be outputting about 13v. I've had it installed for a couple of days and I'...
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1answer
56 views

When is it appropriate to use a dedicated charging ic and when is it appropriate to use a microcontroller? [closed]

To give a little more context, I am designing a device that requires a battery to be charged. What I gather from most commercial designs and reference designs, is that they often use a dedicated ...
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0answers
257 views

Load Sharing/Isolation Circuit with ADP5063

I'm designing the battery power/charging circuit for the Reform DIY laptop which uses a (big) LiFePo4 cell. For the charger IC I've now settled on ADP5063 as it seems simple and can charge with 1.5A ...
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1answer
3k views

TP4056 - Micro USB 5V 1A - Output pins Current supply

I have "TP4056 - Micro USB 5V 1A Lithium Battery Charger with Protection" as below I have a Li-Ion 3000mAH battery like below Connected them as below Questions: What is the maximum current that I ...
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2answers
1k views

Schematic for a lipo battery bleeder overcharge protector

OK, so I am building a 12v (really 11.1v) 10000mah lipo battery. I am going to use it on campouts to run things like 12v fans and car chargers and run other high-current devices that couldn't be run ...
3
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1answer
289 views

Where does the system load go on a bq51051b charge controller?

I'm trying to use an integrated chip for Qi Charging + lipo management + overcharge protection and all the hard stuff basically. The only one that is 'integrated enough' seems to be: http://www.ti....
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2answers
1k 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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3answers
383 views

Is designing and producing a dirt cheap charger really that hard?

Recently one blog service (all text is in Russian) published a curious post. The author proposes to add mobile phone charging capability to each 4-pieces pack of AA alkaline batteries. The idea is ...
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1answer
1k views

How can I extend this circuit to use it in our real life?

I am planning to design a wireless mobile charger circuit next week. For that purpose, I have selected the circuit which is shown below and is collected from the post: wireless mobile battery charger. ...
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2answers
2k views

Why does LM317 burnout when output is shorted in this case?

LM317 voltage regulator has internal short circuit protection alongside with its thermal overload auto-shutdown, but in the circuit below it will simply burnout when the output is shorted. And its ...
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2answers
5k views

Will the lower frequency of 50Hz AC affect overall charging time? [closed]

I'm using a voltage converter to go from 220V to 110V to charge a small appliance. The recommended charging time is 6-8 hours. However, this is specified for US AC voltage 110V@60Hz, whereas the ...
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2answers
2k views

Is it ok to use an old phone as an universal battery charger?

We know that a charger is just an adapter that supplies a constant voltage (5 volts usually). The actual charging circuit is in the phone itself. With a bit of soldering and wiring, can I use my old ...
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3answers
5k views

Diagnosing cause of electrolytic capacitor failing

I am hoping somebody could help me diagnose the cause of failing electrolytic capacitors in a circuit. The context is a charger circuit, more specifically its power supply unit: Given a diode bridge ...

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