Questions tagged [wireless-charging]

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My Tesla coil is not working. Transistor is getting hot

I think my circuit is right, but I don't know why it is not working and why the transistor getting so hot. Transistor: 2N2222A Resistor: 22k 9V battery [![enter image description here][4]][4] In ...
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45 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 ...
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58 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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2answers
73 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 ...
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2answers
149 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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41 views

How to detect the presence of wireless power supply?

How to simply detect if there is availability of wireless power supply (even when there is Voltage from USB is available) using a microcontroller and light up an led if present. The wireless power ...
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1answer
53 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 ...
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1answer
91 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 ...
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1answer
61 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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38 views

How small can a low-power Qi inductive receiver be?

I'm looking to do a quick turn-key solution utilizing a Qi inductive power receiver to charge a few supercaps to power a tiny microprocessor (8pin msp430 or similar) for a few minutes; however, I ...
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25 views

LiPo balanced charging circuit from USB, controllable by a Raspberry Pi

I am building an RC car controlled by a Raspberry Pi, and I'm not sure how to go about setting up the power delivery circuit. I plan to power it with a 5200mAh LiPo battery, 2 cells, 50C rating @ 7.4v....
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23 views

LTC4124 charging LED pulled high

I am new(ish) to hardware and I have a two-part question. I'm working with the Analog Devices LTC4124 chip for wireless Li-Ion charging. I'm using the dev kit (2773A-B) for charging the receiver. The ...
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57 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?
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1answer
150 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 ...
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2answers
112 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 ...
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2answers
761 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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41 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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1answer
94 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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43 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 ...
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1answer
83 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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1answer
138 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 ...
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0answers
95 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 ...
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1answer
22 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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0answers
80 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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2answers
167 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 ...
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1answer
81 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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81 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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360 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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1answer
36 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 ...
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1answer
236 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 ...
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2answers
74 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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1answer
39 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, ...
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53 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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4answers
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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2answers
244 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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2answers
233 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 ...
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2answers
86 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 ...
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1answer
210 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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0answers
118 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 ...
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1answer
433 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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1answer
39 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 (...
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1answer
78 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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2answers
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 ...
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31 views

measuring wireless (inductive) power supplies

I bought an electric toothbrush with a lithium-ion battery and wireless (inductive) charger. It came with one of those air/water jet flossing accessories, which also has a lithium-ion battery and a ...
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2answers
432 views

Wireless Power Transfer for a toothbrush

The general idea is to charge a cordless toothbrush from 12V DC, instead of the mains. I have used a simple circuit that I more or less lifted from a Linear AppNote/Demo manual (DC1969). I would like ...
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0answers
31 views

Charging a device with a power bank [duplicate]

So my device has an input of 5V 0.7A, but the cable isn't detachable from the plug so I need to use a different USB to micro-USB cable. My power bank can output on 2 ports, DC 5V 1A and 5V 2.4A If I ...
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2answers
519 views

Reading voltage from coil on top of Qi Wireless Charger

I am a high school student doing a lab report on changing the number of turns of a coil and seeing the effect it has on the output voltage from a wireless charger. I am trying to take a Qi Wireless ...
-1
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1answer
741 views

Can I use 13003 transistor in place of 2n2222?

I am working on a project which requires a npn 2n2222a transistor as recommandation. But as of now the transistor is not available to me. Alternatively I have transistor 13003 and c945 available as ...
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1answer
64 views

Can the power transfer ranges of wireless charging devices be extended to across a room? [closed]

Wireless charging devices charge devices by creating a magnetic field that induces an electric field in the device (like transformers), but its strength is inversely proportional to distance squared. ...
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2answers
91 views

How Qi charger reads data from receiver

I saw a guy making Qi receiver module with ATTiny13A: Qi wireless power receiver from scratch. In his circuit, secondary shorted through capacitors to ground to send data. My question is how ...