Research interview questions - advice on Wireless Charging

[Avo Mk8]

Two major challenges (not to say they can't be overcome), and there are probably others!

1) To encourage industry across the world to use a common standard for 'wireless' (eg inductive) charging. There is a (Chinese) standard - Qi, but not everyone uses it! See:

Evolution of Qi Wireless Charging Standard & What’s New With Qi2

How does the new Qi2 wireless charging standard work? Learn about Magnetic Power Profile (MPP) and how it differs from previous standards, BPP and EPP.

www.graniteriverlabs.com

Proliferation of a common standard requires the cooperation of standards bodies and governments, as has been achieved with the USB C standard for battery charging by wire:

A common charger for electronic devices: Revision of the Radio Equipment Directive | Think Tank | European Parliament

A common charger for electronic devices: Revision of the Radio Equipment Directive

www.europarl.europa.eu

2) Increase the maximum power that be handled by this technology, currently as suggested in the blurb above about 15 Watts with Qi. That limits the scope of what devices can be charged in an acceptable timescale.

 

[Avo Mk8]

Is it possible though to create something like a wireless phone charger that charges your laptops/ipads/mobile phones without them all having to be the same brand?

See my post about Qi

So it would be multi-device but you'd have to have the charger in the close vicinity of all of the devices?

The current (pun intended) technology requires a device to physically sit on the charging mat (coil). Not 'close vicinity' but actually physically on it. I'm not aware of any 'safe' ways of increasing the distance, as alluded to in the previous posts.

 

[DPG]

OP - just to clarify, are you meaning a system that can charge appliances that are some distance from the charging point? ie more than a few millimeters /centimeters.

 

[HappyHippyDad]

I know who would have come up with some really interesting and intelligent ideas, explained in an eloquent manner. Most of which I wouldn't have understood :-(

 

[mainline]

Power transmission over long distance already exists and has for years.

Toyota had inductive electric car charging in 2011.

Power mat phone/laptop charging has been around for years.

Japans bullet train used induction.

But as already said bigger the distance bigger the losses.

 

[researchstudent123]

Power transmission over long distance already exists and has for years.

Toyota had inductive electric car charging in 2011.

Power mat phone/laptop charging has been around for years.

Japans bullet train used induction.

But as already said bigger the distance bigger the losses.

Hi Mainline,

Do you know why there isn't a consumer friendly wireless charger available on the market for multiple devices of different brand s then? For example, I'd like to charge my android phone at the same time as my macbook air without cables - but have the charger plugged in close by wireless charging

 

[James]

Ultimate Wireless Charging Station - Smartwatch for Less

The Ultimate Wireless Charging Station for your iPhone, Android phone (only USB-C port), AirPods, and Apple Watch. The ultimate solution.

www.smartwatchforless.com

 

[narkedatninety]

Power transmission over long distance already exists and has for years.

Toyota had inductive electric car charging in 2011.

Power mat phone/laptop charging has been around for years.

Japans bullet train used induction.

But as already said bigger the distance bigger the losses.

Inductive relies on very short distances. Maybe you were thinking of resonant?

e.g Inductive Versus Resonant Wireless Charging: A Truce May Be a Designer’s Best Choice - https://www.digikey.co.uk/en/articles/inductive-versus-resonant-wireless-charging

 

[mainline]

Inductive relies on very short distances. Maybe you were thinking of resonant?

e.g Inductive Versus Resonant Wireless Charging: A Truce May Be a Designer’s Best Choice - https://www.digikey.co.uk/en/articles/inductive-versus-resonant-wireless-charging

The technique is still “inductive” in that the oscillating magnetic field generated by the primary coil induces a current in the secondary

 

[narkedatninety]

The technique is still “inductive” in that the oscillating magnetic field generated by the primary coil induces a current in the secondary

You said "power transmission over long distance already exists and has for years", then stated several examples of very short range inductive methods.

Long range WPT methods specifically utilise LASER, microwave, resonant-magnetism for e.g satellite applications.

An Efficiency Enhancement Technique for a Wireless Power Transmission System Based on a Multiple Coil Switching Technique

For magnetic-coupled resonator wireless power transmission (WPT) systems, higher power transfer efficiency can be achieved over a greater range in comparison to inductive-coupled WPT systems. However, as the distance between the two near-field resonators varies, the coupling between them...

www.mdpi.com