Questions tagged [wireless-charging]
The wireless-charging tag has no summary.
187 questions
1 vote
1 answer
79 views
Half bridge inverter for WPT is ringing
Good afternoon. I'm making a circuit for a wireless charger. For prototyping purpose, I'm assembling everything on a breadboard. I have an issue with ringing at the moment the upper MOSFET turns on. ...
- 13
6 votes
1 answer
497 views
Best Practices for Cable Shield Termination on Floating Devices
I’m connecting two floating handheld devices, A and B, with a single cable that carries: A 6.78 MHz wireless-power RF link over an internal coax Multiple digital signal twisted pairs (each pair ...
- 71
0 votes
0 answers
133 views
6-slot wireless-charging rig keeps toasting one TX board… what am I missing?
I’m building a multi-bay wireless charger for 3.7v 1200mah Li-ion batteries (think “six gadgets at once”). Each slot is a matched XKT-412 TX/RX pair. RX side gives me ~5 V @ 2 A and that simply feeds ...
- 9
1 vote
2 answers
123 views
Does a stainless steel screw going through a wireless charging coil affect its behavior?
I am designing a 3D printed phone mount for my e-bike. The bike's stem has a built-in wireless charging coil that's compatible with my iPhone and charges via the bike's battery. I don't know how much ...
- 111
2 votes
1 answer
260 views
Is it safe to place a wireless charging coil on top of a lipo battery pack?
I'm a hobbyist and playing around designing some projects for fun. I am currently thinking of adding wireless charging to a small watch I am designing. Because it's a watch, there is not much space ...
- 129
0 votes
1 answer
75 views
In wireless power transfer coil characterization what is the significance of resistance of the transmitter coil at resonance frequency
I am characterizing a wireless transfer coil with the help of this document from Omicron. In page no no-7 you can see that they are finding the resistance of the coil at resonance and it's value is 9....
- 4,047
0 votes
2 answers
122 views
What will happen if the Impedance of wireless power power transfer TX coil and RX coil are different
I am new to WPT. Currently I am characterizing the coils to be used used for our WPT.I measured the inductance of TX coil and RX coil at 100Khz. The impedance of RX coil is 4.5uH @ 100Khz and that of ...
- 4,047
0 votes
0 answers
60 views
How to calculate the Voltage coming at the output of a wireless power transmitter
I am simulating a wireless power transmitter using LT spice.I used an H bridge invertor to drive the TX coil. I need to calculate the output voltage coming at the TX coil (As shown in red). Can you ...
- 4,047
1 vote
2 answers
230 views
Do wireless power transfer coils have polarity?
This question is a continuation of my previous topic. I need to characterize this coil with the help of this document. The coil will be connected to a BNC adapter and the other end of the cable is ...
- 4,047
0 votes
1 answer
173 views
Properties of coils used in a power transmitter and receiver
I am completely new to wireless power transfer. I need to model a wireless power transfer link with the help of a Bode 100. This is the reference document given to me. Before starting this, I would ...
- 4,047
0 votes
1 answer
68 views
How does 'passive robust wireless power transfer' (wireless power unaffected by distance or orientation over a wide range) work?
This 2018 article and video from the University of Michigan talks about a passive method for wireless power transfer that is unaffected by distance and orientation over a wide range. How do such ...
- 103
1 vote
0 answers
18 views
Multiple Qi transmitter/receiver pairs powering one device
*disclaimer: I'm just a tinkerer and this is more of a hypothetical thought exercise than anything. I'm planning on adding a usb-c Qi receiver to my keyboard, and I was wondering if it would be ...
4 votes
2 answers
652 views
Is the core essential for wireless power transfer?
I am working on a pad for wireless power transmission as a college graduation project. If you look at the papers, there are cases where the core is used, and there are cases where the litz wire is ...
- 119
1 vote
0 answers
73 views
I'd like to make a wireless charging pad
I would like to implement a wireless charging system as my graduation project. The topology to be used is likely to use the "SS compensation" topology. The problem is, we have to design the ...
- 119
0 votes
1 answer
125 views
How to convert this 220V AC input inductive charger to 127V AC input?
My friend bought a device that has wireless charging, but in my country, in the region I live, the AC voltage is 127V , and she received (a long ago) by mistake a 220V AC input version. She never got ...
- 661