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Questions tagged [wireless-charging]

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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
53 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
59 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
32 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
79 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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0answers
36 views

2 MOSFET DC to AC Inverter Design (Wireless Charging)

For one of my projects, I am trying to create a wireless charging station for a LiPo battery. For my input, I'm taking the standard 120 Vrms, 60 Hz voltage source I get from a outlet. From initial ...
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1answer
44 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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32 views

Minimal components for lighting an LED via wireless power transfer

I understand the basic concept of wireless power transfer. I wanted to make some wireless LEDs (Similar to this concept) and was trying to figure out the minimum component count I required in order ...
2
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1answer
142 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
42 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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0answers
108 views

How to calculate the self capacitance of a flat spiral coil?

I am trying to design a wireless charger and I have to find the resonance frequency of the flat spiral coil. The formula is this one: ƒr = 1/(2*pi*√(LC)) . So I need to know the inductance of the ...
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3answers
197 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
68 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
44 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
92 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
167 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
79 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 ...
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3answers
123 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
59 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 ...
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2answers
165 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
199 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
120 views

Simulation of Qi Communication Signal in LTSpice

I try to simulate the communication signal between transmitter and receiver in LTSpice (Wireless Charging Qi). For this I realized on the transmitter side a full bridge (Input 12V), which is operated ...
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0answers
109 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 ...
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1answer
167 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 ...
1
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1answer
78 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 ...
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3answers
538 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 ...
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1answer
77 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 ...
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2answers
92 views

In conductive wireless charging applications, how does the charging base distinguish between human and metal contact to avoid electrocution?

I've been following a few products that were announced recently that use conducting wireless charging and they're all advertised as being safe for users, even though some of these operate at high ...
0
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1answer
94 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
60 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
79 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
100 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
310 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 ...
0
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1answer
53 views

Wireless Powering Products

Are there wireless powering products for a distance of 50 cm? I want to design a sensor tag where it can be recharged wirelessly. Is that possible?
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1answer
121 views

wireless power transmitter produces voltage but nothing picked up on receiver

Here's another attempt I made on wireless power: I borrowed ideas from http://4hv.org/e107_plugins/forum/forum_viewtopic.php?74096 but due to limited stock on hand, I had to use what I can. I used ...
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1answer
97 views

Wireless charging circuit

I'm designing a wireless charging circuit and i've noticed that on the internet there are two types of circuits: For some schematics the LC circuit is made in series resonace, in some in parallel. ...
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2answers
420 views

How to convert from power signal received by Antenna to voltage signal?

I am considering wireless transmission. Let us define a cosine signal with frequency 2.4 GHz, i.e. $$s(t) = A\cos(2\pi ft),$$ where $$f=2.4\times10^9.$$ Let us assume that when TX transmits the ...
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2answers
87 views

why my laptop can't use wireless charging technology? [closed]

we start to deal with wireless charging technology in recent years with the booming of smart phones why wasn't it possible with laptops? does the smart phone's battery differ from laptop's?
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1answer
211 views

In a single diode rectifier circuit, is capacitor offering additional energy to Load?

I am a graduate student majoring in electrical engineering. Now, I am studying about wireless power transfer and energy harvesting. While reading a paper written by Bruno Clerckx, who is senior member ...
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2answers
208 views

Is a battery management system necessary for wearables? [closed]

My team and I are working on developing a wearable device (like a heart rate monitor with IP68 dust/waterproofing) and we're utilising wireless charging for our 3.7V 350mAh non-removable battery. We'...
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2answers
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Is it possible for a Wireless device charging pad to fry RFID / Contactless cards?

Lets say for example that a person has a wireless charger in their car centre console (an option on some new cars) This person puts their wallet and phone there and the charger kicks in. (wallet ...
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0answers
332 views

Significant voltage drop across IGBT

I'm using an IGBT in a wireless charger circuit as a swtich to send 'pulses' of power across the gap. I have 14V coming from the mosfet driver and I can see around 5v on the collector. I have the ...
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3answers
7k views

How to build a self-made Qi compatible (wireless) charger

So I recently discovered that my phone, a Nexus 5, has Qi wireless charging capabilities. I was wondering if it is possible to make my own charging coil with 24/26awg wire that would look something ...
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1answer
235 views

Receiving 27MHz wireless power

I am designing a high frequency passive RFID tag-like device that receiving 27MHz wireless power, use it to power a onboard MCU and a low power transmitter. The estimated current drain is about 50mA. ...
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3answers
121 views

Inductive charging problem

I am fairly new to electronics and I recently made an inductive charger that transfers 18 volts over a couple mm from 120 volts. The problem I am having is that while the voltage transfer is good, the ...
4
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1answer
125 views

Is it possible to redesign a portable electronic device such that it can be charged by a domestic microwave oven?

Soon after iPhone 6 was introduced there was a prank claiming that the smartphone can be charged by leaving it in a running domestic microwave. TL;DR don't do it, it is very, very unsafe. There's a ...
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0answers
163 views

the difference of power transfer efficiency between a conventional coils and printed planar coil?

In inductive coupling, I found there are two types of coil can be used. One is very conventional as shown in below: Another one is printed planar coil, like this If the outer diameter of the planar ...
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1answer
630 views

Wireless Power transmission. Is it possible to achieve 100-200w (load side) power using off-the shelf components?

Short introduction! I've recently built electric skateboard (you can look up the commercial ones) and I want to design/get a wireless charging system for it! The problem is, it seems the current Qi ...
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0answers
167 views

What is causing the MOSFET to overheat and blow?

I am following this guide, using a 12VDC 2A power supply. However the M2 MOSFET keeps blowing. Below is the schematic that I have used. simulate this circuit – Schematic created using ...