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Questions tagged [wireless-charging]

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How to Increase The Wireless Charging Range [on hold]

I've been doing some research regarding this topic. I've tried to find answers and haven't gotten them. At first I wanted to see how can I increase the range or the transmitter distance of a wireless ...
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1answer
25 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
49 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
34 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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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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1answer
129 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
29 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
40 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
81 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 ...
-1
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1answer
54 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
42 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
67 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
155 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
23 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
113 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
100 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
479 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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2answers
85 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
68 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
89 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
37 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 ...
0
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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 ...
2
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1answer
79 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
126 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
75 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
709 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
141 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
326 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
47 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
345 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 ...
0
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1answer
81 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 ...
1
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1answer
65 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 ...
1
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2answers
432 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 ...
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2answers
563 views

Does wireless charging degrade battery life? [closed]

Does a design using wireless charging such as QI effect the longevity/health of lithium-ion batteries such as those found in modern consumer electronics devices? What special considerations must be ...
1
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1answer
163 views

Qi charging multiple devices with single transmitter

I am looking for a Qi charging compliant transmitter and have found kits from different manufacturers like ST/TI/Microchip. These kits have one receiver and are tuned to work together. How can I ...
3
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3answers
157 views

Auxiliary circuit to reduce power losses in idle stage of this oscillator (wireless power application)

I am trying to implement the following resonant oscillator for wireless power transfer application. There will be a secondary coil coupled with Lp. . Reference - WPT Application Note One of the ...
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1answer
60 views

Wireless arduinos

I am currently in the design phase of a project that is using 3 arduino nanos controlling 2 small stepper motors (28BYJ-48) each. There is a lot of moving parts where some movements are continuous and ...
3
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2answers
171 views

How does the diagram really work? [closed]

Good afternoon, I am a high school student and in my scientific fair project, I would like to do an experiment about wireless energy. I want to implement the resonant inductive coupling. According ...
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3answers
485 views

Why is wireless power transfer done between two coils at their self-resonant frequency?

I was reading this paper about wireless power transfer via strongly coupled magnetic resonance: http://www.ijirem.org/DOC/1_Wireless%20Power%20Transfer%20via%20Strongly%20Coupled%20Magnetic7a7f01ee-...
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0answers
26 views

How does the change of load on the Rx side influence the Tx resonance voltage in a wireless powering sysytem

As the circuit shows, U = 5V toggling the polarity in 10KHz. When IL is changed from less than 1mA to 20mA, the P-P voltage of the Tx coil will increase. How should I understand the phenomenon? I have ...
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0answers
280 views

QI COMM-Signal Simulation ltSpice

For a school project (Wireless Charging), I have to filter out and display the communication signal (2KHz) between transmitter and receiver from the Power Signal (100KHz). For this I have set up the ...
0
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1answer
219 views

Wireless charging

I am trying to make a circuit to transfer power from one coil to another I have tried difference frequencies here are the results Fun Fact: When I am producing frequencies between 20Hz and ...
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1answer
92 views

Power IR2110 from a low voltage AC Source

I am trying to power the IR2110 using an AC Source. However, this source is also connected to a full wave bridge rectifier that's going to supply a controlled buck converter. I tried using a voltage ...
3
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3answers
902 views

Using a capacitor instead of a coil for wireless charging?

This might sound like a stupid question, but I'm kinda interested in a detailed explanation. So while inductive charging is rather ubiquitous, things like electric toothbrushes and Qi chargers come ...
0
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1answer
84 views

Fast charging ports under the hood - technical details behind the standards? [closed]

There are a few things I noticed and examined for two different fast charging standards: MediaTek PumpExpress works without any data communications with the charger. Output 2 from my USB multimeter ...
0
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1answer
116 views

How should you position two flat-wound spiral coils for the best coupling?

I created two flat wound-spiral coils (also known as bifilar coils). The transmitter coil I made with an outer diameter of 10 inches and an inductance of 3 mH. The receiver coil I used a much smaller ...
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1answer
69 views

Slayer Exciter Interfering With Voltage Measuremnet With Multimeter

I've built myself a slayer exciter and I am trying to measure the output voltage. I've created a coil with approximately 10 turns and soldered a bridge rectifier to the ends of the coil so I can ...
1
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1answer
93 views

How can I build my own wireless charger for my cellphone? [duplicate]

I am designing a wireless charger for my cellphone, Where my Primary coil is energised with 1.5V and 0.3A, Where I have used a transistor to turn it on and off at a frequency of 1Mhz. In the secondary ...
3
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1answer
125 views

Do these waveforms look appropriate for charging an 11.4 V, 3830 mAh lithium ion battery?

I'm putting together a wireless power transfer based battery charger to charge an 11.4 V, 3830 mAh battery from the output of a 15 V voltage regulator I made. Due to a limited understanding of ...
0
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1answer
602 views

Powering a motor through wireless electricity [closed]

simulate this circuit – Schematic created using CircuitLab simulate this circuit Schematic redrawn by Transistor. OP to edit or delete as required. I have a wireless electricity transmission ...