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Questions tagged [wireless-charging]

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Multiple Qi transmitter/receiver pairs powering one device

*disclaimer: I'm just a tinkerer and this is more of a hypothetical thought exercise than anything. I'm planning on adding a usb-c Qi receiver to my keyboard, and I was wondering if it would be ...
Geoffrey Sauer's user avatar
0 votes
0 answers
32 views

Help needed for verifying 3.3 V wireless charging schematic with LIR927 battery

I am currently working on a small electronics project for my swimming club and could use some advice. Forgive me if this is basic, I'm really new to electronics. I am working on a wireless charging ...
Sean O'Sullivan's user avatar
4 votes
2 answers
559 views

Is the core essential for wireless power transfer?

I am working on a pad for wireless power transmission as a college graduation project. If you look at the papers, there are cases where the core is used, and there are cases where the litz wire is ...
kogyu's user avatar
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36 views

Transistor failure in multi channel high frequency AC signals

[Intro] To begin with, I am an undergraduate electrical engineering student working on my senior project. I wanted to make a wireless charging pad like that of Tesla's wireless charging platform and ...
Martin's user avatar
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1 vote
0 answers
46 views

I'd like to make a wireless charging pad

I would like to implement a wireless charging system as my graduation project. The topology to be used is likely to use the "SS compensation" topology. The problem is, we have to design the ...
kogyu's user avatar
  • 119
0 votes
1 answer
68 views

How to convert this 220V AC input inductive charger to 127V AC input?

My friend bought a device that has wireless charging, but in my country, in the region I live, the AC voltage is 127V , and she received (a long ago) by mistake a 220V AC input version. She never got ...
Rodrigo's user avatar
  • 567
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0 answers
41 views

Is my rough design of wireless powered leds with a capacitance touch sensor reasonable?

Disclaimer: I am not an engineer, but I have a background in physics, so theoretically I should know most of this stuff, but in reality, I might have made some very basic and dumb mistakes. The ...
Tue's user avatar
  • 101
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1 answer
80 views

Ironing out a design for resonant inductive coupling on 13A. Would I be better off with MHz or GHz for efficient power transfer?

I am having a go at designing an extension cord that uses resonant inductive coupling. My knowledge lacks in this area, so I'm going back and forth via online research & chatgpt 3.5. From what I ...
Dragonfly3r's user avatar
0 votes
5 answers
110 views

Is the communication between transponder car key and car digital or analog? [closed]

I am surprised to not find much info on-line about the technology and communication technique that car immobilizer systems use to communicate with the transponder key. To be more specific, my 2001 ...
Cool Pontiac's user avatar
0 votes
0 answers
130 views

Help with exploring the possibiltiy of "long distance" wireless charging

I have a question regarding the possibility of wireless charging (via coils and pads.) Essentially, I am trying to develop a product that will require charging from a car's battery and will be placed ...
Matheus's user avatar
1 vote
0 answers
35 views

How to know if an Rx coil is compatible with a wireless Qi charging pad?

My goal is to add wireless charging to my project. There is a list of Rx coil parts available to buy here. How do I know if a given coil will be compatible with a Qi charging pad? Which specs do I ...
dinoswords's user avatar
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0 answers
99 views

Wireless charger reverse engineering

I am trying to figure out how to design an H-bridge for a wireless charger. And I thought that reverse engineering an off-the-shelf one might give me some clues. I might have made numerous mistakes ...
shklj's user avatar
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0 answers
86 views

STUSB4500 shutting down when I hook-up my wireless charger

I'm using the STUSB4500 to generate 12V, 3A which generally seems to work. I'm configuring the STUSB4500 NVM registers using the SparkFun_STUSB4500.h library and the code looks like so: ...
Cyril Schmidiger's user avatar
1 vote
2 answers
145 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 ...
Razero's user avatar
  • 199
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0 answers
50 views

Optimizing wireless charging

I am trying to build a wireless charging system for a drone. I have a 3s Lipo battery and I would like to plug in a wireless charger transmitter into it. I will then plug the wireless receiver onto ...
mdansfo's user avatar
3 votes
1 answer
204 views

Is it possible to "relay" a wireless (inductive) charger using two coils?

I'm on a quest to have an iPhone wallet case that supports wireless charging. I won't bore you with my long list of failures, but would love feedback on this strategy. I 3d printed a case which puts a ...
bendytree's user avatar
1 vote
1 answer
174 views

Wireless phone charging: ways to mitigate distance (charging gap) limitations?

I'd like to use a nice, thick otterbox defender style case, and keep wireless charging, but not shell out almost $100 for the actual otterbox defender case. Those cases are sturdy and protect the ...
Jake Barbudo's user avatar
3 votes
0 answers
135 views

Resonant Coupling for Optimal Power Transfer

I am trying to read the following paper: B. L. Cannon, J. F. Hoburg, D. D. Stancil and S. C. Goldstein, "Magnetic Resonant Coupling As a Potential Means for Wireless Power Transfer to Multiple ...
ELec's user avatar
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0 answers
27 views

Battery State Indicator LEDs in Wireless Charging

I am working on a custom wireless charging System. I am using the following ICs Transmitter IC: https://www.analog.com/media/en/technical-documentation/data-sheets/LTC6992-1-6992-2-6992-3-6992-4.pdf ...
Zunuran Nasrullah's user avatar
0 votes
0 answers
94 views

How to make a Qi charging mousepad for my mouse and keyboard?

This image shows my plan. Will this work, each of them being an individual charging circuit,or should I be combining the coils for each area into one circuit? If I need to combine, can I just solder a ...
Emmett Shuttleworth's user avatar
5 votes
2 answers
2k views

Can wireless charging become more energy efficient?

I've stumbled upon a few articles saying that wireless charging takes more energy to charge something compared to the cable. Like this one. Like in the test from the article, it takes 47.33 % more ...
Maltoon Yezi's user avatar
-1 votes
2 answers
230 views

USB-PD over USB-A

I have a power adapter from Samsung which supports an output of 5.0V 2.0A or 9.0V 1.67A. The adapter has a USB-A output and fast charges my S10 at 9V. Can USB-A be used for USB-PD? I also have a ...
Aditya Desai's user avatar
0 votes
0 answers
22 views

Smallest pitch 2 pin connector for WLC coil

I am not sure if this is right forum but does any one knows the part number or component for connecting WLC coil to 2 pin on PCB. WLC(Wire less charging coil) is for a wearable ( 1 A max current) . I ...
Raulp's user avatar
  • 109
5 votes
4 answers
1k views

Would a room-sized coil used for inductive coupling and wireless energy transfer be feasible?

My understanding of inductive coupling is that it isn't feasible over long distances because the spread of the magnetic field lines happens rapidly, so not much flux will go through the receiver coil ...
Whelchel's user avatar
  • 153
1 vote
1 answer
109 views

Issues with a full bridge rectifier, receiving output approximately half of the expected output

I have receiver circuit for a wireless power transfer circuit. I have connected the circuit as shown in the image below. The circuit has a full bridge rectifier (DBS103S-T) which is then followed by a ...
EmeraldMonk's user avatar
3 votes
1 answer
156 views

How does the floating light bulb rotate and power off? [closed]

I am trying to understand on a high level, how famous floating light bulb actually works. https://www.floately.com/products/volta-light-bulb I kind of understand how it floats and how it is supplies ...
ng.newbie's user avatar
  • 133
0 votes
0 answers
63 views

How can I calculate the coupling coefficient between two coils?

I have two planar, circular coils of different number of turns, inductances, and radius, stacked on top of each other. How can I calculate their coupling coefficient (k) based on their properties and ...
Andreiul's user avatar
0 votes
1 answer
109 views

How can I solve these two equations to determine resonant capacitors for a wireless charging coil?

My questions: What are S, D, and the apostrophe above Inductance? Is the equation looking for the inductance of the coil or the circuit? Once I know what S and D stand for how can I determine their ...
Tim Cerka's user avatar
  • 109
1 vote
2 answers
199 views

**FINAL UPDATE** I'm getting closer to a workable circuit for this device?

FINAL UPDATE I think the power supply is squared away accept for some caps and resistors. Thank you for sticking with me. One question: There are two thermistors (one for each battery pack) that are ...
Tim Cerka's user avatar
  • 109
0 votes
0 answers
93 views

How to determine the maximum charging output of a QI wireless charging coil and circuit board?

I purchased a 20-watt 3-coil QI wireless charging coil and PCB recently (see image with specs below) and I want to power it via the USB-C header and preferably a USB-C to USB-C cable. The USB port on ...
Andrew's user avatar
  • 1
0 votes
0 answers
101 views

Can I use X5R ceramic capacitor for 100KHz resonance serial capacitor in wireless charger?

I am designing a Qi-compatible wireless charger. The reference circuit design recommends to use X7R capacitor. But a specific capacitance of X7R capacitor is out of stock at this time of writing. (C50 ...
PCBCrew Engineer's user avatar
2 votes
0 answers
86 views

MOSFET driver circuit for wireless charger improvements

I'm designing a circuit for power wireless charge. The final application is a remote controller which needs to be charged and programmed with no cables. The circuit i designed, charge the battery of ...
Andrea Piccini's user avatar
0 votes
0 answers
94 views

Load modulation in wireless charger

I was trying to understand the principle behind wireless charging solution. I have ran into obstacle where i am unable to understand how load connected across Rx coil can affect its the amplitude and ...
Manu's user avatar
  • 41
0 votes
0 answers
2k views

Identify USB wireless charger and possibly ways to use, modify, or control it

A friend found this device, and I have determined that it seems to be a wireless charger for a phone, smart watch, or similar device. The markings show it to be a "Wireless Gear" Model ...
PStechPaul's user avatar
  • 7,475
1 vote
2 answers
474 views

Did my wireless charger melt because of another wireless charger nearby? [closed]

I got home today and immediately smelled burnt plastic. I discovered that an Apple Watch charger burned and melted (every part of the charger is original Apple.) See included photos: https://drive....
Jakub David's user avatar
0 votes
1 answer
51 views

What difference will these two coils have when it comes to charging a 3.7 V, 300 mAh battery?

Coil 1: 22 × 12 × 0.87 mm, 27.9 μH, 1.21 Ω Coil 2: 30 × 10 × 0.52 mm, 12.8 μH, 1.27 Ω The specification sheets for both says they are rated for 2 W maximum. Now that got me confused. If both are 2 W ...
manish.mandal's user avatar
3 votes
2 answers
595 views

H-bridge PCB with N-channel MOSFETs and a MOSFET driver not working

I recently designed an H-bridge circuit to try to develop a wireless charging circuit. I am currently generating the PWN signals with a function generator. There are two signals which are at 10 Vp-p ...
EmeraldMonk's user avatar
0 votes
1 answer
67 views

Use phone wireless charging reverse as power source [closed]

How can we use phone wireless charging reverse as power source to light LED or any small device?
user3106820's user avatar
5 votes
4 answers
2k views

Is it viable to transfer electrical power through a glass pane?

I know that there is a way to induct electricity with an electromagnetic field. I also know that is the part of physics used by wireless phone chargers. I have a basic understanding of physics and ...
Przemek B's user avatar
2 votes
1 answer
130 views

Choosing capacitors for QI charger

I plan on using the TI BQ51051B as a QI reciever and Li-po charger. I plan to use the TDK WR121210-27M8-ID as the receiving coil, and the TDK WT151512-22F2-ID as the transmitting coil. I am having ...
jb0's user avatar
  • 224
1 vote
1 answer
81 views

Small profile waterproof electrical connector/bulkhead

A friend and I are working on designing a power meter to affix to the crank arms on our bikes (similar to Stages, 4iiii, etc). The enclosure will house a small PCB connected to strain gauges, and we ...
d.slotcavage's user avatar
3 votes
1 answer
485 views

How to add a magnet to a coil's center without disturbing coil's charging effect?

I have a very nice wireless charger which can charge my smartwatch. Smartwatch itself contains a neodymium magnet on its back (and there are chargers which also contain another neodymium magnet to ...
Daniel's user avatar
  • 969
0 votes
1 answer
247 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 ...
Anthony J Feghaly's user avatar
0 votes
1 answer
102 views

Help with voltage doubler in a WPT application

I need some help with this schematic to have higher voltage at Vrect. This is for charging a receiver at 25 mm in a WPT application. I was expecting a voltage of 2Vin at the output of the voltage ...
Guillermo Durà Mira's user avatar
1 vote
0 answers
121 views

Is there any shortcut to wireless charging, preferably Qi compatible or NFC?

Qi charging is awesome, can push a lot of power from the sender to the receiver, enough to quite rapidly charge a mobile phone. I do however find the circuits to be very advanced and involve a lot of ...
www.jensolsson.se's user avatar
0 votes
2 answers
283 views

How do I connect the phone cable in the breadboard

I am making a wireless phone charger, and everything works, but I don’t know how to connect my cable to the receiver circuit. My cable has 4 terminals, and my receiver circuit is similar to this one.
Haspacejar's user avatar
3 votes
1 answer
450 views

Simple wireless charging standard as used in toothbrushes?

I have a project that requires wireless charging of a small hand-held controller with a single 1S lithium-ion cell. People's initial thought was to use the standard Qi mobile phone chargers to save ...
John U's user avatar
  • 7,169
3 votes
3 answers
458 views

Why doesn't magnetic power transfer use ferromagnetic cores in the coils?

One well-known fact is that putting a ferromagnetic material in an inductor will increase the magnetic flux and thus the inductance value. Wireless power transfer (WPT) happens through the magnetic ...
Horror Vacui's user avatar
  • 1,397
0 votes
0 answers
62 views

Cannot obtain a generalized state space averaged model for simple wireless power transfer system

this is the first time I ask a question. I am currently working on finding a state space model of the following system : where \$U_i\$ is a square wave of amplitude \$U_{in}\$. This circuit ...
Nicolas's user avatar
0 votes
1 answer
556 views

Extending wires of wireless charger coils

I have an original wireless charger: I want to extend the wires to the coils to bring the charging pads further from the PCB, about 80-100 cm. I would cut the wires (at the red), and apply new ones (...
Daniel's user avatar
  • 969