Questions tagged [wireless-charging]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0
votes
1answer
280 views

Wireless Induction coil wired to USB

I'm not an electrical engineer so forgive any obvious ignorance that may be unwittingly baked into the question. Background: My kids have these Disney Infinity Light FX figures that, now that ...
0
votes
1answer
56 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?
0
votes
2answers
690 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 ...
0
votes
2answers
95 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?
0
votes
1answer
316 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 ...
1
vote
2answers
241 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'...
1
vote
0answers
369 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 ...
0
votes
1answer
284 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. ...
2
votes
2answers
142 views

Wireless chargers in series?

I'm a complete amateur at electrical stuff, although I can solder and make some basic electronics with Arduino. I'd like to wirelessly charge a battery in the rotating part of an astronomy dome. The ...
0
votes
3answers
129 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
votes
1answer
130 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 ...
3
votes
3answers
2k views

Wireless Power Transfer at 50Hz

Is is possible to transmit power using magnetic resonance coupling at 50Hz? Assuming I have no constraints on the minimum distance between the primary and the secondary coil. However, the coils are to ...
2
votes
2answers
1k views

Long range, wireless power transmission

What are the difficulties restricting the development of wireless power transmission over long distances? Could wireless power transmission be harmful and/or dangerous?
0
votes
1answer
91 views

Charging circuits wirelessly [closed]

After learning that some devices can be charged up wirelessly through inductive means (which https://powerbyproxi.com/wireless-charging/ illustrates), I want to try to invent a simple one myself, but ...
1
vote
1answer
67 views

Is it possible to induce few volts IMPULS over 10 m distance?

I'm currently learning about electromagnetism at college, so this question is on mine mind for a few weeks. If we have on one side: 9 V battery, DC-DC converter to few kilovolts, capacitor, button, ...
-1
votes
1answer
151 views

What kind of coil do I need for wireless power transmission?

My project: I am trying to design a system for a school project that will help with electrical safety. My idea is a wireless electrical socket/outlet. It will use a transformer to convert 120v to 6v, ...
1
vote
2answers
79 views

Wireless power transfer through voltage spikes?

I'm sort of digging up something with this question, which relates the the whole wireless power transfer concept. I've looked at a question about power transfer and Tesla, and I know that there's ...
0
votes
0answers
111 views

Shielding from inductive charging in simple PCB

I am going to design a fairly simple binary LED wrist watch. For a cool feature and a good learning experience I want it to have wireless charging capabilities so I purchased this wireless charging ...
-1
votes
1answer
405 views

How does wireless mobile charging work in BMW 7 series car?

I've seen a video in which the presenter just keeps the phone in some small chamber and closes it for automatic charging of smartphone.
3
votes
0answers
1k views

Qi Receiver on PCB

I'm looking at implementing Qi charging in my project, would it be possible to have a Qi receiver directly on the back of the PCB (copper traces in the shape of a coil)? Could this interfere with the ...
0
votes
1answer
68 views

Wireless power within a stainless steel enclosure?

I need to transfer power wirelessly within a small SS tube that is not much larger than the diameters of the Tx and Rx coils. The coils are both inside the tube and are co-axial with it. Coils are ...
0
votes
1answer
673 views

Why LTspice is showing singular matrix error in the following inverter circuit?

While simulating this circuit I am getting an error of singular matrix. Any advice?
0
votes
1answer
1k views

Multiple Wireless charging coils (Qi) in parallel?

I am making a device that will be wireleslly charged and I decided to go for a standardized Qi transmitter/receiver. The device is a kind of bulk and I want it to have an option to get charged no ...
0
votes
2answers
365 views

Simulation for Wireless Power Transfer works fine, Prototype on breadboard doesn't

I am working on a Solar Powered Wireless Power Transfer project. The simulation for the circuit I am working off of works really well. I have built this design and others on a breadboard but I am ...
0
votes
1answer
450 views

Inductive Charging Mouse [closed]

I recently bought a wireless gaming mouse and while functionally its great, the battery life is a little less than I would like. I tried to mitigate this by adding in another rechargable AA battery (...
0
votes
2answers
170 views

Wireless energy scavenging from in-home wiring EM fields

I was wondering if it would be possible to power a little 3.3V microcontroller, by harvesting an electromagnetic field around an in-wall insulated 240V 50Hz AC power cable. Something like contactless ...
2
votes
1answer
927 views

Wireless Power Coil - Is this shielding? Field shaping?

I'm taking apart a Qi wireless power transfer receiver. The coil is etched into the pcb. The entire coil area (approximately 3.75 x 4.5 cm) is covered by a rectangular piece of hard, brittle material. ...
-2
votes
1answer
101 views

Can I reprogram my SPI flash wirelessly?

I am working on an application which stores specific model information in the SPI flash. The hardware is the same between the five different types of units. They are typically programmed with model ...
-1
votes
1answer
413 views

Maximum current to the circuit

The schematic of the wireless power transmitter is shown , The circuit works good. The inductor connected between circled nodes 1 and 1 is 24uH. (Note: both the inputs of FET are not shorted, they ...
0
votes
2answers
272 views

Power Electronics [closed]

I am currently building a wireless charger. I have difficulty in understanding the working of the regulator (7805) to which I connect the load and measure my output power. My power receiver circuit ...
0
votes
1answer
150 views

WPC Inductive Power Transfer

I am building an Inductive Power Transfer (IPT) system. As of now I am using a design based on a flyback converter. It works great but I am having issues adding features such as power control feedback ...
1
vote
1answer
359 views

what is the use of ultrafast diodes in wireless battery charger ckt

Instructable I am working on a wireless charger that uses a ZVS Driver circuit for the transmitting end. This is its circuit diagram: I have attached the instructable where this came from. Wireless ...
2
votes
2answers
915 views

Is the QI norm about the components or the coil?

I would like to have induction charging for my smart object and I was looking at QI chargers/receivers The QI chargers I find on the market are "designed for phones" : they are very flat and offer a ...
-2
votes
1answer
253 views

Why does the Apple Watch use a wireless charger, even though such a charger works slower than a MagSafe-like wired connector would? [closed]

The Apple Watch includes a built-in lithium polymer battery (a few hundred mAh; slightly more than 3.75 V) which is recharged using a wireless inductive charging cable. The cable does use magnets to ...
-2
votes
1answer
1k views

Trying to make a wireless charging circuit with an AC source

i'm making a project on wireless charging and according to my understanding if i attach a ac source with a coil and attach a voltmeter to an other coil i should get voltage on the voltmeter provided ...
1
vote
2answers
141 views

power wireless charger from mains

I want to run a large inductor coil for wireless charging with a 12V peak, 300kHz AC signal, starting with UK Mains voltage (230Vrms 50Hz). Should I use a step-down transformer and then a frequency ...
1
vote
1answer
416 views

amplifying 555 astable multivibrator output [closed]

I am using 555 as astable multi-vibrator and its output is a square wave of 7 V and frequency is around 800 kilo hertz.But i need to increase the voltage to about 40 V . What should i do? Actually ,...
2
votes
2answers
1k views

Inductive wireless mobile charger circuit

In wireless mobile charging circuit, is there any formula of spacing which varifies that by increasing diameter and turns, spacing (range) can be increased?
0
votes
2answers
1k views

How does this wireless charger work?

I want to understand the way this circuit works. The following are diagrams of the transmitter and receiver of a wireless iPod charging circuit. I have added a link to the instructable that describes ...