Questions tagged [wireless-charging]

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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
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31 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
4 votes
2 answers
448 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
74 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
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0 answers
18 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
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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
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1 answer
77 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
88 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
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42 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 ...
Theodor's user avatar
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1 answer
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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
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1 vote
2 answers
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**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
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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
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0 answers
57 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
62 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
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54 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
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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
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2 answers
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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
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1 answer
49 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
323 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
55 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
4 votes
4 answers
1k 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
80 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
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1 answer
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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
263 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
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0 votes
1 answer
191 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
92 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
64 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
193 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
133 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
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3 votes
3 answers
309 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
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0 votes
0 answers
56 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
338 views

Extending cords of wireless charger coils?

I have a pretty dumb question, but I feel better to ask than wondering: Having an original wireless charger: And I want to extend its wires to the coils to bring the charging pads further from the ...
Daniel's user avatar
  • 947
0 votes
1 answer
123 views

Wireless charging shielding requirements

I have a project where I want to throw a charging coil into the wonderful mix of tiny parts but the problem is, I also need an accelerometer/magnetometer roughly right beside said coil. I believe I ...
OwenTheProgrammer's user avatar
0 votes
0 answers
219 views

Could anyone identify the manufacturer or a similar product to this ~6x7mm inductive charging coil?

I had this smart ring from a company called Oura, and I took my charger apart recently. Inside, I found an incredibly small inductive charging coil printed inside of a little FPC. Could anyone ...
David Moore's user avatar
1 vote
0 answers
132 views

What is the equation relating Vin and Vout on a 2-Port Network?

I was reviewing a paper, and I got stuck while trying to understand the analysis of the two-port network. This is the circuit below with the equation below it This is my attempt below, my knowledge ...
Mr Vee's user avatar
  • 11
0 votes
2 answers
80 views

Does wireless power have any effect on batteries without being in a circuit?

I have this wireless charger. I put the transmitter in a 3D printed enclosure and the receiver in another 3D printed enclosure. On top of the receiver, I've put 8x INR18650-30Q 3000mAh batteries. I've ...
Georgi Dimitrov's user avatar
3 votes
2 answers
224 views

Wireless Power system does not... well... power anything

I am trying to make a wireless charger for a small handheld device. I've tried searching on the internet for something read-made, but everything I could find was much larger than I could fit. The way ...
Twometer's user avatar
  • 241
0 votes
1 answer
153 views

How does the blocking FET Q1 exactly work in this case?

This is a wireless power controller chip. Means it is a controller that switches between a wired (5 V) USB supply and a wireless power supply based on availability and also based on priority. In the ...
Coppers Copernicus's user avatar
1 vote
1 answer
113 views

Is it possible to get power from an electric motor using wireless?

I have an electric motor (see description below.) At the same time I have a micro-controller attached to it which consumes (0.3W-0.4W) powered by a USB port. I'm wondering if it's possible to power ...
mostafa 's user avatar
0 votes
1 answer
80 views

Simultaneous wireless information and power transfer using MOSFETs for modulation

I have found an interesting simultaneous wireless information and power transfer concept where two MOSFETs are used as switches to switch two other resonant capacitors. Because of the switching in the ...
Gabriel's user avatar
  • 55
0 votes
0 answers
89 views

Does my Wireless Charging PCB need to have FCC, UL, CSA, certified marks?

I have a simple 5W output wireless charging device that uses a tx coil to transfer power to a phone, this is powered from a 1800mAh battery. Do I need any certifications for this?
Bryan Cunningham's user avatar
1 vote
1 answer
668 views

Qi Charger broken magnetic backing plate

My Qi charger module arrived with a broken backplate. It appears to be some sort of magnet. What is the exact purpose of this backplate? Is it meant to amplify the signals or only have them go one ...
Tom Hartogs's user avatar
0 votes
2 answers
215 views

Simple wireless power transfer circuit question

source: https://circuitdigest.com/electronic-circuits/simple-wireless-power-transmission-circuit-diagram Above circuit is the very simple wireless power transfer circuit, but I could not find any ...
user207787's user avatar
2 votes
3 answers
3k views

Wireless charging Lipo batteries

I found this discussion while looking for a way to wirelessly charge my 3S drone battery. I would like to find a way to drop my drone on my desk (like I do my phone) and let it charge. If I am ...
Chris's user avatar
  • 121
1 vote
0 answers
116 views

Does thickness or density of material between a wireless charging transmitter and receiver affect the power?

I'm planning to build a small enclosure out of wood for a wireless charger and have been testing various thicknesses of wood to ensure my phone still detects and receives a charge, however, I'm only ...
xdumaine's user avatar
  • 111
1 vote
1 answer
270 views

Find the Q-factor for coils and understand weak power transfer

I built coils for wireless power transfer. Found inductance with a LRC meter. Put capacitors, hoping for a resonant frequency at 300kHz. Student assisted me with a NVA machine where a resonant ...
Krits's user avatar
  • 125
0 votes
0 answers
63 views

Issues with wireless charging receiver circuit

Circuit is not functioning as intended, just get repeating pulses Vrect ~= 2.5V. I understand Vrect needs to be above this value but I having trouble getting there. AC1 PAD 1 & AC2 Pad2 are ...
dvdmeece_OI's user avatar
1 vote
1 answer
89 views

Wirless Power Tansfer Circuit

Hello so my university is closed because of covid. I am allowed one day into their labs to build and test my WPT device. My Tx is very large compared to my Rx. I have tested their inductance with a ...
Krits's user avatar
  • 125
2 votes
1 answer
185 views

Qi Charging transmitter types

I am working on a Qi Transmitter project and I have found that the Qi transmitter that I am using is not able to charge Iphones and Samsung phones at the 7.5 W that it should be able to. I am using ...
mgwalker95's user avatar
2 votes
0 answers
224 views

Comparing inductances from LCR measurements and FEMM simulations of a simple transformer

I am trying to compare the results from a simple transformer using two identical Wurth Elektronik inductors (Reference 760308102308, datasheet attached). I measured the inductance with an LCR while ...
Camilo Rachello's user avatar