Questions tagged [wireless-charging]

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2 votes
1 answer
48 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 ...
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1 vote
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 ...
3 votes
1 answer
92 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 ...
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0 votes
1 answer
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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 ...
0 votes
1 answer
55 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 ...
1 vote
0 answers
36 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 ...
0 votes
2 answers
97 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.
3 votes
1 answer
89 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 ...
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2 votes
1 answer
155 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 ...
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0 votes
0 answers
37 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 ...
0 votes
1 answer
110 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 ...
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0 votes
1 answer
78 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 ...
0 votes
0 answers
158 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 ...
1 vote
0 answers
78 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 ...
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0 votes
2 answers
75 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 ...
3 votes
2 answers
179 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 ...
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0 votes
1 answer
79 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 ...
1 vote
1 answer
100 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 ...
0 votes
1 answer
73 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 ...
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0 answers
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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?
1 vote
1 answer
357 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 ...
0 votes
2 answers
144 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 ...
1 vote
3 answers
2k 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 ...
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1 vote
0 answers
74 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 ...
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1 vote
1 answer
160 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 ...
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0 answers
52 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 ...
1 vote
1 answer
86 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 ...
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2 votes
1 answer
163 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 ...
2 votes
0 answers
165 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 ...
0 votes
1 answer
34 views

BQ51050B compatibility criteria

I started another project where I need to charge a few devices (preferably simultaneously) wirelessly. They all have BQ51050B and the corresponding coil/battery. I need to know what I should look at ...
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1 vote
0 answers
86 views

Will adding a DC-DC converter affect how a modern car operates?

I'm thinking of adding a wireless charger to my car, and adding a Buck Converter to step down the 12V source to 5V for efficiency sake. However, I am worried about the emissions from the DC-DC ...
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0 votes
2 answers
218 views

NPN transistor switch wireless charger module

I am using this module for wireless charging, as a receiver, and i want to switch it on and off, because firstly it consumes about 5mA when idle and secondly i want to power it off when the battery is ...
0 votes
1 answer
112 views

Questions about coil voltage and phase shift in the WPT system

I performed simulations of wireless power transfer in matlab simulink. It was powered with DC voltage which was then converted into a rectangular voltage with a frequency of several dozen kHz. The ...
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0 answers
109 views

Wireless torpedo charger: Coil design and torpedo detection

I'm building an RC submarine with torpedoes and I thought a good way to power them would be with a capacitor. To keep everything water tight, I am hoping to use wireless charging. Here's a rough ...
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1 vote
0 answers
548 views

Royer oscillator - frequency shifting in WPT

I am having a problem with my WPT resonant application. In my circuit modified Royer oscillator feeds LC tank. Receiver coil nearby is connected to rectifier and variable resistor. I know about ...
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0 votes
1 answer
61 views

metal plate VS ferrite plate

I'm designing a wireless charger project for our UV light cure system and don't want to buy a wireless module because they are not professional actually (using very simple components without any ...
0 votes
1 answer
740 views

High frequency switching MOSFET

i'm having af hard time finding the proper MOSFET for my wireless power transfer. I need a MOSFET which can easily do 100kHz without overheating and with minimal power dissipation. I'm currently using ...
0 votes
2 answers
78 views

Capacitors choice for MHz resonance circuit

I am implementing a resonance circuit (for wireless charging) in MHz frequency (\$5-10~MHz\$) , and now, I am looking for suitable capacitors. The peak voltages and current through the capacitors are ...
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0 votes
1 answer
44 views

switching frequency 5206-2G

I would like to use the 5206-2G H-bridge for my wireless power transfer circuit, but i can't find the switching frequency which the FET's can tolerate. I have looked several times at the datasheet, ...
0 votes
0 answers
57 views

Selective wireless power transfer

It is possibile to power on a single led (in a led panel) using wireless powering? I know the possibility to transfer power by wireless, but, is there a way to transfer power with high precision (1mm) ...
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5 votes
4 answers
2k views

Measured Q factor of LC circuit does not correspond with calculated and simulated

Still having a problem with measured value of Q factor of parallel LC circuit. My measurememt setup looks like on the picture below. I use Function generator SFG-1003 and Oscilloscope Rohde-Schwarz ...
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0 votes
2 answers
293 views

Resonant wireless charging with really low efficiency, even when coils are in touch

I am working on a new project which uses wireless power transfer. I know that wireless charging in general is not so effective but my circuit is extremely not effective. Can I ask you for some advice?...
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0 votes
2 answers
374 views

How to design wireless charging coils so they are resonant?

I am continuing from this question: What can I use to increase efficiency of inductive wireless energy transfer instead of factory manufactured ferrite plates? I am trying to make somewhat efficient ...
0 votes
2 answers
137 views

What can I use to increase efficiency of inductive wireless energy transfer instead of factory manufactured ferrite plates?

The Context I am a hobbyist with no education in electrical engineering. I am working on a DIY project trying to make water resistant rechargeable bicycle lights. I am doing this as a hobby for fun ...
0 votes
1 answer
231 views

Swapping of Desktop Voltage Supply with Wireless Charging Module Results in Unexpected Voltage Differences and High Current Draw

I'm trying to power my circuit via a wireless coil module and have a working circuit using a desktop voltage supply at the same voltage (12V). Simply by swapping out the desktop voltage supply with ...
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0 answers
190 views

Wireless power transfer circuit to attain ~5W of power on the receiving end

I am designing a WPT system to run a ws1812 based pixel chain. The ws2812 pixel chain runs on 5v and consumes 500-800ma of power, means 2.5w-4w. The system I made is not able to transfer adequate ...
3 votes
1 answer
696 views

Cascade multiple Full-bridge Rectifiers Connected to Multiple AC Sources

I want to rectify multiple isolated AC signals (Generated from multiple wireless power receiving coils) to a single DC load. For example, consider the following the schematic with two voltage sources \...
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0 votes
1 answer
44 views

Efficiently rectify 18-20V to 12V AC-DC for wireless charging

Connected to terminal J1 is a wireless charging receiving coil (18-20V AC). Is there a more efficient way to produce 12V DC from this with enough power to drive the charging circuit and wifi comms (...
2 votes
1 answer
101 views

Can/will the Qi charging system damage LF (125-133kHz) RFID tags?

In the Qi standard, frequency is listed as 80-300kHz for the higher power application which is within the target(resonance?) frequency of LF RFID tags. So power transmission should be quite high for ...
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2 answers
38 views

The lifetime of a WSN [duplicate]

What formula(s) should be used to determine the lifetime value of a wireless sensor node, charged up by a supercapacitor(its capacitance value its known), with a given power/energy consumption? It is ...