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wireless charging

TheBean
By TheBean
in Hobby Electronics
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Posted

isnt wireless charging just induction by generating a magnetic field by a coil? why does it mean to be Qi compatible? like whats the Qi standard?

why cant I just wrap a coil and call it a day?

 

also, if wireless charging really just is a coil of wire, why cant you make a really long regular charging cable, make a coil out of it and effectively charge plugged in and wirelessly through the same cable?

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Posted

hi @Saksham

 

1. isnt wireless charging just induction by generating a magnetic field by a coil? : Yes the coil will generate a magnetic field because electricity goes trough it. This will cause also electricity to flow in the coil (The secondary coil) within the phone.

 

2. why cant I just wrap a coil and call it a day? : You might actually be able to do this when it has the correct length cable and has the correct amount of windings on the coil. You also need the correct amount of power flowing trough it as this also determines the power of the magnetic field.

 

3.  why cant you make a really long regular charging cable, make a coil out of it and effectively charge plugged in and wirelessly through the same cable. : I don't see why this won't be possible but i don't have enough understanding of the concept to explain this.

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33 minutes ago, Saksham said:

im not bothered to do that. thats why i was asking. 

*-sigh-*

33 minutes ago, Saksham said:

if there is communication, what do they need to communicate?

From wikipedia:

Quote

Regulation of the output voltage is provided by a digital control loop where the power receiver communicates with the power transmitter and requests more or less power. Communication is unidirectional from the power receiver to the power transmitter via backscatter modulation. In backscatter modulation, the power-receiver coil is loaded, changing the current draw at the power transmitter. These current changes are monitored and demodulated into the information required for the two devices to work together.[3]

https://en.wikipedia.org/wiki/Qi_(standard)#Features_and_specifications

 

So that you don't have to be bothered to read it, the receiver tells the emitter "More" or "Less" voltage to keep the current at the correct level.  The standard defines the method that is used (backscatter modulation) and the protocol for messages.  It also defines the voltages, duty cycles, # of coils, et cetera. 

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Posted
32 minutes ago, Saksham said:

im not bothered to do that. thats why i was asking. 

if there is communication, what do they need to communicate?

Dude if you can't put in the effort to read the answer why do you think someone should just do it for you. 

https://www.qiwireless.com/

 

 

▓ƆԀ▓ S▓₱▓Ɇ▓c▓s▓: i7 6ʇɥפᴉƎ00K (4.4ghz), Asus DeLuxe X99A II, GT҉X҉1҉0҉8҉0 Zotac Amp ExTrꍟꎭe),Si6F4Gb D???????r PlatinUm, EVGA G2 Sǝʌǝᘉ5ᙣᙍᖇᓎᙎᗅᖶt, Phanteks Enthoo Primo, 3TB WD Black, 500gb 850 Evo, H100iGeeTeeX, Windows 10, K70 R̸̢̡̭͍͕̱̭̟̩̀̀̃́̃͒̈́̈́͑̑́̆͘͜ͅG̶̦̬͊́B̸͈̝̖͗̈́, G502, HyperX Cloud 2s, Asus MX34. פN∩SW∀S 960 EVO

Just keeping this here as a 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