Clarification on How Wireless Charging Works

AI Thread Summary
Wireless charging operates using two coils that create a changing electromagnetic field to transfer electric current, similar to a transformer. It cannot effectively work with direct current (DC) alone, as a constant voltage does not induce a current in the receiving coil. The process typically involves converting DC to alternating current (AC) for wireless transfer, then rectifying it back to DC for charging. This method allows for efficient energy transfer at a frequency that is more suitable than standard mains cycles. Overall, the technology relies on the principle of changing currents to facilitate wireless energy transfer.
pcvrx560
Messages
7
Reaction score
0
As far as I know, they use two coils and rely on a changing electromagnetic field to transfer electric current. So would wireless charging not work for DC current since a constant voltage would create an unchanging electromagnetic field and therefore unable to induce a current in the other coil?
 
Physics news on Phys.org
It's like a transformer, in principle. A changing current is required.
 
But it's perfectly simple to convert DC to AC, transfer wirelessly, then convert it back.

In fact it's often done by converting to DC, then to AC again at a more convenient frequency than mains cycles - do the wireless transfer, then rectify back to dc to charge a battery.
 

Thread '1:1 versus 2:1 Mechanical Advantage debate'

The rope is tied into the person (the load of 200 pounds) and the rope goes up from the person to a fixed pulley and back down to his hands. He hauls the rope to suspend himself in the air. What is the mechanical advantage of the system? The person will indeed only have to lift half of his body weight (roughly 100 pounds) because he now lessened the load by that same amount. This APPEARS to be a 2:1 because he can hold himself with half the force, but my question is: is that mechanical...
View full post »

Thread 'Newton's first law?'

Some physics textbook writer told me that Newton's first law applies only on bodies that feel no interactions at all. He said that if a body is on rest or moves in constant velocity, there is no external force acting on it. But I have heard another form of the law that says the net force acting on a body must be zero. This means there is interactions involved after all. So which one is correct?
View full post »
Thread 'Beam on an inclined plane'

Thread 'Beam on an inclined plane'

Hello! I have a question regarding a beam on an inclined plane. I was considering a beam resting on two supports attached to an inclined plane. I was almost sure that the lower support must be more loaded. My imagination about this problem is shown in the picture below. Here is how I wrote the condition of equilibrium forces: $$ \begin{cases} F_{g\parallel}=F_{t1}+F_{t2}, \\ F_{g\perp}=F_{r1}+F_{r2} \end{cases}. $$ On the other hand...
View full post »

Similar threads

Wireless Microcurrent Stimulation
Replies
3
Views
1K
I How induction works within a coil (nuances of it)
Replies
6
Views
2K
Direct and alternating current, a personal approach to understand them
Replies
1
Views
1K
I Need a good idea : 3D simulation of Inductive wireless power transfer
Replies
6
Views
2K
Back EMF cancelation question with multiple coils wound on the same core
Replies
10
Views
2K
Electrical DIY wireless power transfer device concept
Replies
5
Views
6K
Where is the strongest intensity of an electromagnetic field produced by a solenoid?
Replies
4
Views
1K
Are Tesla Coils really special?
Replies
3
Views
1K
How does a Permanent capacitor motor actually work?
Replies
7
Views
1K
B Antenna induction, oscillating circuit generating EM Waves
Replies
6
Views
2K

Hot Threads

Recent Insights

Back
Top