Questions tagged [wireless-charging]
The wireless-charging tag has no usage guidance.
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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
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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....
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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 ...
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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 ...
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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?
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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 ...
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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 ...
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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 ...
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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 ...
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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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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 ...
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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 ...
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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.
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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?
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
