Questions tagged [charger]

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

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How to solder two 3.7 V LiPo batteries in series and then balance charge them

For a project, I need to power an Arduino Nano 3.3 V BLE. The Nano accepts 5-21 V on its VIN pin and then regulates that voltage down to the 3.3 V it needs. To do ...
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Please help me understand the equipment and setup needed to power a 4*100Ah battery system via Generator + Shore power [closed]

I am planning a build for a campervan. I have a loose understanding of how to achieve what I want, but I'd like to ask some questions to people who are competent in this realm. I am going to use 4*...
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What is this solar path light component?

Just for fun and curiosity, I decided to reverse engineer an old, cheap solar path light. It's a fairly simple circuit, but there's a component I can't find any information on. It has transistor-style ...
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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 ...
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Can I charge a 3.7V 150mAh LiPo battery from USB?

Can't get a clear answer anywhere. Need to replace small batteries in small sports mp3 players. They had 150-190 mAh Li-Ion batteries. All I can find are Li-Po replacements. Can I charge those the ...
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Keyboard LiPo battery charger schematic review

I am designing a wireless keyboard, currently working on the schematic. I have been looking at MAX17330 Charger IC. Here's the datasheet. When USB is plugged, it should charge the battery and power ...
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What is this connector type (Segway e-Scooter charger)

I'm doing a little research to, in the future, possibly replace my Segway E110SE e-Moped charger whenever it gives out or to possibly have a second one on hand to haul around to destinations. Whatever....
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TP4056 - high temperature

The TP4056 (1A) gets very hot (around 80-100*C) when charging the cell, so much so that it is impossible to hold it for more than a few seconds. Is it safe to use this circuit without any cooling?
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Noise in measurement

I'm having a problem when I measure a voltage from a lead battery. I provide my circuit so you can understand better whats happening. For example I measure a 24 V battery, goes to a resistor divider ...
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DC leakage in single and three-phase rectifier (Electric vehicle chargers)

It seems that the IEC 61851-1 standard ask for a device monitoring DC earth current for any EV charging station, either single or three phases. What I'm wondering, is, which topology of charger, or ...
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RLD + RC Snubber for MOSFET

I'm currently making a DC-DC SMPS power supply that converts 331VDC (rectified from 240VAC) to 60VDC with a maximum output current of 10 amps. I've asked once on this forum about a general problem on ...
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TP4056 STDBY or CHARGE COMPLETED PIN PROBLEM

I have charger circuit TP4056 based. My battery capacitY is 1100mAh(LIPO). Charging current is 580mA according to datasheet that has R9. While I am charging the battery, i read 0V from BAT_CHG pin. ...
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4 answers
651 views

Why is this LM317 giving an unexpected output?

Just for fun, I used an LM317 IC with two resistors (1.5k and 470 ohm) to get an output voltage of around 1.8 volts and used this circuit with a wall clock. It worked amazingly well when I connected ...
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Why did my power system suddenly stop working?

I've created a wearable device with a power system that is replicated from the Adafruit Powerboost 1000. It contains a charger and booster chip. It worked for several days until the red LED that ...
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TP4056 Output Voltage Problem

I have charger circuit TP4056 based. My problem: Output voltage of TP4056 is very variable. Input voltage of TP4056 is about 5.4VDC from DC power supply. Output voltage is between 4.0V and 5.4. I ...
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Help find a usb to ac cord [closed]

I've been looking every where for a cord that is powered by usb with an ac outlet on the other side so I can plug the usb into a portable battery and have an ac outlet can someone please tell me where ...
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What type of circuit/components are needed to make a phone charger that stops charging when the battery is full?

I'm building my own portable power station, using a 12v lead acid battery as a power source. Currently I've got 1 12v socket and 2 usb ports on it. The idea being to use it to power something like a ...
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AP9211 typical charge + power circuit

I just found that AP9211 chip as cheap and alternative replacement to previous Microchip IC that price has skyrocketed and is unavailable until next year (maybe more). With previous chip there was a ...
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3 votes
2 answers
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How does this circuit work? (24 V lead-acid charger)

How should this circuit be controlled to ensure that the backup battery is properly charged? The battery is a 24 V lead-acid battery. This is a circuit diagram of a UPS device. A PWM signal is ...
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1 vote
1 answer
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Why is my battery showing a huge negative inrush current in my designed charger model?

I have a three-phase charger model on simulink as shown below, with a three-phase active front end converter followed by a phase-shifted full bridge DC/DC converter. The circuit is working pretty ...
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Using replacement charger with different output voltage/amperage specs

I am currently using a charger that outputs 15V @ 4.0A. I would like to know if I can use a charger that shows these output details in the back: 20.0V@3.25A / 15.0V@3.0A / 9.0V@2.0A / 5.0V@2.0A from ...
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Can I charge a 4000 mAh Li-po battery with a single TP4056 module?

I bought a single 4000 mAh lithium-polymer battery and connected a step up converter and TP4056 module. I am providing a circuit image; the only difference between the image and the actual circuit is ...
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How fast does a 65 watt charger actually charge the batteries?

My laptop (A thinkpad t440s) has a 6-cell battery: three pairs of 18650 batteries in series, for a total of about 11V. My charger is 65 watts at 20 volts, which works out to 3.25 amps. My question is, ...
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Exchange a battery with capacitor?

I have this 5 V lamp work with a internal-battery. I took the battery out and it work with the 5 V charge directly. But it flash/flick sometime. My idea is to put a capacitor in place of the battery ...
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2 votes
1 answer
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Increased output after capacitor has been added in parallel to the battery charger transformer [closed]

What could be the cause of increase in voltage after polarized capacitor has been connected with a transformer? And what can I do to avoid that? I added a capacitor in parallel with a transformer ...
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3 answers
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Can a LiPo battery be charged directly from a 5V wall charger?

An old tablet I was playing with, "bricked" and won't charge, so I'm looking to jump charge the battery directly. It's a 4000mAh LiPo 1S battery, so a 5V charging voltage should be enough. I ...
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Constant current battery charger with ac/mains cutoff

I need to build or purchase, an efficient 48 V battery AC to DC charger for my home solar system, which can charge the battery in constant current mode using grid power and once fully charged it ...
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3 answers
588 views

How does this charger work?

I just got this charger circuit from my broken charger. I would like to know about the circuit of the charger. When you see the circuit, the AC line is directly connected to a bridge rectifier which ...
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1 answer
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Lead acid battery charger

I designed the below circuit. The relay open above 13V and close below 13V. How can I make relay open above 14V and close below 12V? Tell me if the circuit have major problem. Thank you.
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1 vote
1 answer
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Solar panel battery charger

I am looking for a way to power my webcam without having to use a long extension cord outside. I have come up with this circuit. Will it work? Can I improve it? Thanks in advance for the help!
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MPPT solar buck charger - how does it sense when to change charge stage/regime

I have a well-engineered MPPT buck solar charger that I am looking to repair; the schematic is unavailable. The charger is unstable, and randomly changes what charge regime it's in. Does anyone know (...
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1 vote
1 answer
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Replacing 12V 19AH lead acid battery with 12V lifepo4

I have a Stanley PPRH7DS battery charger that came originally with a 12V 19AH lead acid battery. This battery has since given up the ghost and I am looking to replace it. Last summer I constructed a ...
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15s lithium ion battery charger

I am designing a battery charger to charge 15 lithium ion cells in series that add up to 63 V when fully charged. I have shortlisted a charger controller IC from Maxim, the MAX17703. The IC provides ...
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1 vote
2 answers
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How does USB-C powerbank know if I want it to charge or be charged? [closed]

A while back, I tried to use a USB-C powerbank (I think it was a Ravpower "PD Pioneer 20000 mAh, 60 W Portable Charger") to charge a laptop that was powered by USB-C (a new Lenovo). The ...
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1 answer
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Does a 3S 18650 battery pack need a balanced charge circuit?

I am looking at building a custom powerbank with 3 or 4 cells in series to generate 11-15V. I am looking at some of the TI Li-Ion charger IC's BQ257x3 and BQ241xx. These are really nice IC's but don'...
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2 votes
0 answers
154 views

Help to understand the operating logic of the Bosch charger

I ask for your help to: determine, if possible, the type of transistor T5, T7 (SMD code: MK3C). help me understand the operating role of the set T5, T7 and R23, R33 in the circuit (it's like a ...
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-1 votes
2 answers
86 views

Connecting two CC/CV chargers in series with different curent ratings

I have a 26 series Li-ion battery pack of 96V. I have 2 CC/CV chargers of 48V each. My Google search shows that I can connect the two 48V chargers in series to charge the 96V battery, but I have ...
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1 vote
2 answers
103 views

Rogue winding on flyback transformer?

I was reverse engineering a battery charger (Lidl brand Parkside 20V battery charger PLGS 2012 A1, with smart functions, among them charge current and termination voltage settings) and came across ...
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Could I get help understanding voltage and current relating to power supply and charger? I have 3 questions at the end

I posted a question regarding a tool and power supply to a few different platforms, but came to the similar confused responses. So I believe I have went wrong somewhere and wanted to start from ...
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266 views

3S Li-ion charger circuit

This my third question about a 3S Li-ion charger circuit. In the first one, I learned about the functions of a BMS: BMS adjusting charge current In the second one, I learned that a charger circuit is ...
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Leakage current 2-pin usb-c charger [closed]

since I began using a 2-prong usb-c charger, i have noticed a vibrating sensation when moving my hand over the metal body of my laptop. If i ground myself, the vibration gets stronger. If I use the ...
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-2 votes
1 answer
121 views

Unsure about the component type or model. Drill charger. Parkside 14.4 V

What is the component in the circle? This is for a charger to charge a battery for a drill. Is it a transformer?
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-2 votes
1 answer
134 views

TP4056 charger module - Can we change the "Preset 4.2 V Charge Voltage" to 4.0 V?

I am using a TP4056 charger module to charge a 2000 mAh lithium-ion cell (18650). The source voltage is from a solar panel that generates a maximum voltage of 4.0 V. The TP4056 charging module is not ...
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How to do a solar charging circuit and a discharging circuit to a single battery?

I have a solar charge circuit with 6v solar input and a 5 V, 1 A USB output and connected to a 3.7V LiPo battery. Since I needed battery % display 5 V, 2 A USB output I needed to add a circuit for ...
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-1 votes
1 answer
756 views

Why does output voltage drop when charging battery? [closed]

I'm an electrochemical engineer. I saw a video showing although the output voltage from transformer is about 16.5V without connection, the voltage immediately drops to 9.86V, slightly higher than the ...
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1 vote
2 answers
133 views

CN3722 solar controller does not stop charging

I have this custom PCB witha CN3722 module. I charge two 18650 batteries. Resistors XVR7 and XVR6 are calculated for 8.3 volts. The charger charges the batteries and the "done" LED turns on ...
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5 answers
141 views

How can a mobile phone being charged kill by electrocution?

We have in France a wave of warnings about using a mobile phone while being charged in humid environments (or when taking a bath). A charger is plugged directly into the wall socket and the charge ...
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How to control voltage using PID when driving SCR?

I am designing a scr based digital battery charger for the first time and have successfully driven scr to provide 110V-DC from a 140V singe-phase transformer. 2 SCR-diode combination forms full bridge ...
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2 answers
216 views

Making a 12V charger/power supply from a brushless dc motor used as a generator

This is my first question here so if I have done something wrong question-wise iI would like to know. I am building a mini tractor with a small gasoline engine. I want to use a brushless DC motor from ...
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Solar charger with load sharing

I'm looking to upgrade my TP4056 with load sharing charger for my weather station that is working on li-ion batteries. I'm looking for a simple solution without complicated parts, since I'm not very ...
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