Questions tagged [charger]

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

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2 votes
1 answer
668 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)...
0 votes
1 answer
31 views

Charging of 14500 Batteries/ Low mAh reading

I am using XTAR VC4 Plus charger. Batteries (Li-ion) are brand new 1. Sofirn 14500 920 mAh & Keeppower 14500 1100 mAh with PCB & USB port. After running grading mode on this charger ( Charge, ...
0 votes
0 answers
38 views

Do chargers/adapters automatically adjust voltage and current based on which device is plugged in? [closed]

My phone came with a charger that had 5V 1A output. I’m now in the market for a new charger with the same specs and I realise there’s no 5V 1A charger anywhere. I see a lot of multi-port chargers that ...
0 votes
1 answer
295 views

Using a replacement charger with different output voltage/amperage specs

I am currently using a charger that outputs 15 V @ 4.0 A. I would like to know if I can use a charger that shows these output details in the back: [email protected] / [email protected] / [email protected] / [email protected] From ...
0 votes
0 answers
39 views

How can i fix my ebike battery charger? [closed]

My charger for 48v lead acid batteries for an ebike stops working,the charger is receiving the power but can not output the power supply ,how can i fix it
2 votes
1 answer
3k 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 ...
0 votes
1 answer
22 views

Determine proper charger specs for a lithium-ion battery [closed]

I have a device with a rechargable li-ion polymer battery but do not have a charger. Device: ZTE WF723CA ...
1 vote
2 answers
231 views

Solar charger for Lipo battery

Im trying to build a little solar charger for a Li-po battery using 2 solar panels rated at 6V/120mA a linear charger based on the TP4056 chip The idea is to connect the two panels in paralel so ...
0 votes
1 answer
261 views

Variable-current lead-acid battery charger

Digitally controlling a charge voltage with some regulator like the LM317 is a matter of using some resistor and transistor as stated in the LM317 datasheet to select from multiple pre-defined ...
0 votes
1 answer
42 views

Floating output voltage in USB chargers?

A USB charger is usually galvanically isolated from mains for safety reasons. If I touch the output connector while standing on the ground (i am at earth potential), will I get a shock? I think yes, ...
1 vote
1 answer
360 views

Battery charger bypass with diode

I'm a bit of a noob, I have a battery charger circuit connected to a step up converter to get 5V (see 1st image below). The 5V feeds a circuit that draws between 50mA (standby) to 500mA (on). The ...
3 votes
1 answer
52 views

Can I use two of these modules to charge two lithium-ion cells that are in series?

I need a solution to charge two 3.7 V lithium-ion cells that are in series. However I have a very limited access to modules and I need to have current limitation as my source won't stand beyond 0.5 A. ...
0 votes
1 answer
35 views

Battery charging algorithm

I have designed my MPPT battery charger to a state and I have been able to generate the 14.4V charging voltage, with the 40Ah battery charged upto 14.4V during bulk charging stage and absorption mode ...
1 vote
2 answers
287 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 ...
1 vote
0 answers
57 views

EV charger connector identification

I am building a portable EV charger demo for conferences, and for transportability reasons, I need the charger cable to be removable. Have you ever seen that connector?
0 votes
1 answer
50 views

How to determine pinout on proprietary 3-pin charging port?

I picked up a dog collar at a yard sale that didn't come with a charger. Looks to use a 3pin charge port which takes 12v. Don't really want to buy a special charger for just 12v so was wondering how ...
0 votes
2 answers
58 views

Is it safe to connect 3 batteries 2 in parallel and then one in series with them?

I have three 3.7 V li-ion batteries 4 Ah each. I need total voltage to reach 8.4 V at full charge, and use the higher capacity of the one left battery. Is it safe if I connected two of them in ...
0 votes
1 answer
966 views

Dell laptop charger - is the data pin necessary?

In a P-12 dell charger there are 3 wires - blue, white and black. From searching Google I found out that the blue is probably for communication. Now, is it necessary to use the blue wire in order to ...
1 vote
1 answer
225 views

Replacing a 12 V, 19 Ah lead-acid battery with a 12 V LiFePO4 battery

I have a Stanley PPRH7DS battery charger that came originally with a 12 V, 19 Ah lead-acid battery. This battery has since given up the ghost and I am looking to replace it. Last summer I constructed ...
1 vote
2 answers
82 views

Is this a safe way to increase the current in a battery charger? [closed]

I was watching this video and basically what he's doing is using the 4056 charger controller pin 7 to switch a IRF9540 that connects the positive straight through to the MOSFET. Seems this would use ...
-1 votes
2 answers
223 views

LiFePO4 battery charger and inverter in parallel

I've got a brand new LiFePO4 battery (200 Ah) with internal BMS, got the Blue Smart IP65 Charger from Victron Energy and an inverter. The easiest way to connect them is in parallel (off course adding ...
0 votes
0 answers
61 views

replacing a "li-ion" HFC (3,2v) battery

I have a device with containing 4 x (allegedly) "Li-Ion" HFC batteries in serial but voltage is not 3.7 but 3.2V. labelled values "Li-Ion 3.2v HFC1450 series 500mAh 1.6Wh" Just ...
1 vote
2 answers
4k views

difference in charging battery of different Ah

Can i use a lower Ah battery charger(say 20,30)to charge a higher Ah battery ie 110Ah?What are the consequences? What is the difference in the charger circuit in both case?
0 votes
1 answer
35 views

Gate driver selection for digitally controlled via PFM, LLC resonant half bridge charger

I am designing a LLC half bridge charger. I am going to use a microcontroller to control the switching frequency, with feedback from the output to smoothly control the switching requency. I don't ...
-3 votes
1 answer
4k views

What if i charge a battery with low ampere.?

Assuming we have a mobile-phone LiIon battery and a charger which is only able to supply less ampere than the original one, will it damage the battery if i charge with less ampere charger than the ...
5 votes
1 answer
4k 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 ...
1 vote
2 answers
652 views

Reusing a HP laptop charger of 3 wires (logic inside)

I have an HP laptop charger 18.5v 3.5A (1X2057... WBGST0A...) In the past the charger was working fine and I removed the tip for an experiment, so I can't check wires measuring the original tip. Wires ...
0 votes
1 answer
209 views

Where is current sense on this 3S 40A BMS

I have recently purchased a BMS rated for 3S, 40A (still in transit). Following is pictures for this BMS: Now, according to seller, this has over-current, over-voltage, under-voltage and short-...
1 vote
1 answer
1k views

Three-wire USB type-C power delivery

My HP Chromebook type-C charger stopped working after a hard pull on the cable. I tore apart the connector and found out the wires just beneath the connector were damaged. I got a new connector to fix ...
1 vote
1 answer
54 views

Can I use a single battery charging ic to charge two batteries in parallel?

I am making a wearable device so for better space distribution I would like to use two smaller batteries instead of a big one. I've been using TinyCircuits's ASR00007 (290mA, lipo) battery which has a ...
18 votes
4 answers
13k views

Cellphone charger has no transformer?

I opened up a really tiny mobile phone charger I have, to see how it is designed. The entire "charger" is integrated into a small 2-pin mains plug, 1 x 1.25 x 0.5 inch, that has an USB socket for the ...
7 votes
3 answers
2k 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 ...
1 vote
1 answer
914 views

How to design a circuit to disconnect a battery charger automatically?

I want to use an AC to DC 14.4 V adapter to supply both my circuit and its battery. The circuit works with 12 V and I use a battery during power outages (blackout time). I have prepared the below ...
0 votes
1 answer
149 views

TP4056 USB-C charging module not working

I am having some trouble with my TP4056 USB-C module. When I first got it, I attached a Li-po battery to the battery terminals marked B+ and B- and without any load I plugged it in the socket to see ...
0 votes
1 answer
219 views

BQ51051B or BQ51050B communicate but won't charge

I was building this wireless IC charger using BQ51051BRHLR circuit and when I connected the coil to the transmitter the output on Pin Rect shows a voltage of 10 V but the battery won't charge. Here ...
-3 votes
2 answers
234 views

Symbol for ground vs symbol for a battery [closed]

Could anyone help me to understand if this picture is correct? It is to understand the difference between the symbol of a battery terminals and the symbol of a ground terminal. I would also ...
1 vote
1 answer
91 views

How does this lithium-ion battery charger work?

I opened a cheap USB single-cell lithium-ion battery charger, but can't figure what the Q1 is. It only says 'CR' on the surface. When charging, I measure about 0.7 V between its pins 1 and 2 (those on ...
0 votes
0 answers
28 views

20V Max Lithium Battery "Charge Maintainer"

I have a gadget that uses a 20V max, LiIon, DeWalt compatible battery. It's detached for charging. A DeWalt charger is used to fast charge the battery. The gadget has a POE ethernet connection. I'...
0 votes
0 answers
25 views

Wi-Fi Router Charger: is 100-240V input an acceptable replacement for a 220-240V charger? [duplicate]

My wi-fi router charger is broken and I'm looking to buy a replacement. The old one says - input 220-240V 50/60Hz 0.5A, output 12V 2.5A, efficiency level V Online, the closest I found has input 100-...
2 votes
1 answer
55 views

High voltage at the Schottky's anode terminal (Hobby Li-Po charger circuit)

I'm pretty new at hardware side of things and trying to teach myself circuit and PCB design just as a hobby, so. bear with me if I'm annoyingly noob for you. As a relatively simple first task, I ...
2 votes
1 answer
288 views

Understanding power bank discharge circuit

I am trying to understand the charging and discharging procedure of a lithium ion cell. Eventually I would like to be able to build my own power bank, I understand that there are existing power bank ...
0 votes
1 answer
325 views

How to protect reverse polarized when there are two different power sources

The meaning of the title is, when connecting a DC buck converter and a lithium-ion battery, to ask how to protect the converter from the reverse polarity of the battery first i will use ideal diode ...
0 votes
0 answers
99 views

Can opamp directly drive the MOSFETs?

There is a 12 V DC source. I am also generating a 10 V source from it. The output is connected to a battery. This is basically a battery charging and cutoff circuit. The charging part is working fine ...
1 vote
1 answer
47 views

Is it possible to multiplex thermistors for multiple cell battery configurations for the BQ25756 or other JEITA charge ICs for spaced apart cells?

I'm trying to figure out how to safely implement fast charging using the BQ25756 with a most likely 2s (though up to 4s is possible) layout of physically spaced out cells. I haven't fully decided on ...
1 vote
1 answer
427 views

Protection IC stopping battery from charging

I'm using an AP9101C as a protection IC and an MCP73811 as a charger IC for a single cell Li-po like this: The load works fine, but when I connect +VDC (5 V), suddenly CO of the AP9101C goes to 0 ...
2 votes
1 answer
61 views

Properly Charging NiMH Batteries that Have been Stored for Too Long

For a Robotics Project, I've purchased two equal NiMH batteries, seven months ago. PRODUCT = NiMH Battery 12V 3000mAh XT30 Connector [MH-FC] 20A Fuse 12-20 LINK TO PRODUCT = LINK There is no ...
0 votes
0 answers
43 views

Is this charge controller datasheet schematic an idea circuit to use?

Background - Software Engineer with an interest in EE. I'm looking to include a bq2000 battery charge controller in a circuit that I'm designing. I'm looking to use a bq2000 since it can use multiple ...
2 votes
1 answer
353 views

Solar LiPo battery charger: revision and improvement of the reverse voltage protection circuit for the battery

I am designing a solar charger with MPPT for a 1-cell lithium polymer battery of approximately 6000 mAh. The solar panel is 10W and 21 Voc. I am trying to ensure that the charger has protection ...
0 votes
3 answers
7k views

Pulse charging lead acid battries effects and side effects

I am developing a solar charger which charges lead acid batteries. I would like to clear a few of doubts on this issue. I am using IR2110 gate driver for driving 2 n-channel MOSFETs in an half bridge ...
1 vote
2 answers
67 views

Continuous load with wireless charger

I have a wireless charger module as seen in the picture and I'm trying to use it to power those tiny wireless LEDs (also on the picture) The components work properly, as the charger can charge my ...

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