Questions tagged [wireless-charging]

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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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20 views

Alternative ways to wirelessly power a small load

I'm working on a project which needs to power a small DC motor (50-70mA @ 3.3V). It will be placed in a picture frame hanging on the wall, therefore powering (or charging) it with a cable wouldn't be ...
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34 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
30 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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41 views

Testing a wireless charger with a multimeter

Please let me know if this is not the correct forum for asking this questions. I am a novice when it comes to electronics and DIY. I have a wireless charger that charges an electric toothbrush with a ...
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1answer
65 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
67 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
31 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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51 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
1k 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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1answer
150 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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60 views

Beginner charging + wireless charging IC

This will be more beginner question. Could you please help me choosing the right charging ICs for my project? I have never been doing anything with charging (except Chinese TDA4056 module). Yeah, I'...
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2answers
174 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
66 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
112 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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49 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
94 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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38 views

Increase wireless charging distance

I am using the 15 W charging development kit from Wurth Elektronik to experiment with replacing an existing Qi charger setup. We want to add the ability to send data across the wireless charger which ...
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1answer
30 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
64 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
37 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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29 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
272 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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30 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
109 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 ...
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1answer
324 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
57 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
59 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 ...
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1answer
169 views

H bridge inverter

I am trying out an H-Bridge inverter using GaN FETs at 140 kHz. The schematic is as follows. (In the experimental prototype, I used TI's LMG5200 and the load is connected via a full-bridge rectifier. ...
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1answer
667 views

Design considerations for bifilar coils for Wireless Power Transfer

I found many different DIY videos and posts demonstrating the concept of wireless power transfer using inductive coupling, however, they have limited explanation on theoretical calculations and design ...
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1answer
25 views

How to archieve induction isolation from adjacent inductors on a plane, but no isolation from inductors outside the plane

I am thinking of designing a large wireless charging pad. The idea is to have many inductors in a grid setup, where when a phone is placed on the pad it starts charging from the inductors closest to ...
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2answers
130 views

Why are wireless chargers inefficient?

In the current market, the chargers are only 40-50% efficient. How much is the conversion and flux losses during transmission? Is there any way to improve the overall efficiency? Can a ferrite ...
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2answers
226 views

Wireless Electricity Transmission model not working. Why?

I made wireless electricity transmission model using the principle of magnetic inductive coupling to transfer electricity between two separate coils. The model is very simple, known to everyone and ...
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3answers
536 views

Inductor and capacitor for energy storage instead of battery

I am trying to see if it would make sense to use a LC network to store small amount of electrical energy (500 mWHr or less) as an alternate of a 3.3 V battery. What I understand is that L and C are ...
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99 views

Magnetic Field Interfering with Radio Waves

i am currently building a device that requires a NRF24L01 module to send radio waves to another NRF24L01 to be picked up and interpreted. This is a using an arduino running a code to transmit data via ...
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2answers
75 views

Is this quote about interference from wireless charging coils accurate?

This blog post suggests that apple dropped their promised AirPower wireless charging mat because it didn't pass EMI standards, specifically due to the (unconfirmed) idea that they were using a large ...
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2answers
91 views

What would happen if you accidentally casually put your apple watch on a wireless charger meant for phones or other higher power devices for hours? [closed]

What would happen if you accidentally, casually (because they're supposed to be so convenient!) put your apple watch on a wireless charger meant for phones or other higher power devices for hours? Or ...
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1answer
45 views

Battery free TPMS

I am doing a report about wireless TPMS, and I heard about products where the sensors in the valves do not need batteries at all (operate and transmit the data). Is that correct?? have you encountered ...
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1answer
31 views

Hooking into Qi charger status LED to power something more

I have a Qi charging module and I want to light up a higher-power string of LEDs when my phone is charging through it. The module has a blue status LED to show it's charging, which I think is where ...
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1answer
112 views

Coupling coefficient variation in Wireless power transfer

Question regarding WPT compensation topologies. I'm trying to make a inductive wireless power transfer system where the RX coil can move quite conisderably relative to TX coil and still transfer ...
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1answer
160 views

Connecting transmitter coil to the oscillator

Hi guys i have two problems. 1.Where to connect the transmitter coil to the oscillator part? 2.How to make the output of the oscillator stronger? because someone told me that the output coming from ...
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1answer
109 views

WPT compensation topologies

I'm experimenting with compensation topologies for inductive WPT systems and have a small confusion. The general WPT industry uses compensation networks to cancel out reactive components in the ...
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2answers
1k views

Mutual inductance vs coupling coefficient

Question regarding this and this question about mutual inductance and coupling coefficient. I'm trying to analyse a two coil system: It consists of two coils like in the picture with 2 cm air gap ...
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1answer
185 views

How can I model and simulate a resonant inductive square spiral coil in MATLAB?

I was wondering if it was possible to model and simulate my WPT system in MATLAB to determine if my analytical calculations are correct. I want to model my system in MATLAB as I have seen on MathWorks ...
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1answer
395 views

why do resonant inductive coupling circuit operate at high frequencies?

Just as the title says. Whenever I read a research paper on wireless power transfer via resonant inductive coupling the authors just mention frequencies that range in the kHz and Mhz range, but none ...
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1answer
51 views

Wireless power through air [duplicate]

I know this might be far fetched. In normal everyday life, we have huge amounts of data traveling through the air in the form of electromagnetic radiation. But what if instead of transmitter data ...
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3answers
490 views

Wireless power transfer - Inductive vs. resonant mode

When talking about how wireless power transfer is done, the standards (e.g Qi) distinguish between inductive and resonant mode. (Link) They claim that when the units are in very close proximity it is ...
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1answer
96 views

How does this circuit output 25kHz?

This circuit doesn't use a gate drive, so I am trying to understand how it can output 25kHz. A friend of mine told me that it does so with the use of LC resonance; the capacitor and inductor next to ...
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1answer
83 views

Inductive Charging 2 layer coil transfer to 1 layer receiver. Any issues?

I am looking to incorporate a inductive charging mechanism into a project I’m working on. On the receiving side I only have room for a single layer coil design. For my transfer side I have more ...
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2answers
595 views

Extend wireless Qi charging with a coil in the middle

I have a question regarding wireless charging. Traditionally, you have two coils, the charger and the receiver for wireless charging with Qi (from what I understand). Would you be able to have an ...