Research interview questions - advice on Wireless Charging

[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

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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

 

[Mike Johnson]

Power transmissions over long distance would worry me especially in the confines of my home, IMO I think this is a solution looking for a problem.

 

[mainline]

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

I don't really know what you're getting at, power transmission over long distance HAS been around for a long time.

You then go on to quote Long range WPT methods.

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emrod.energy

 

[narkedatninety]

I don't really know what you're getting at, power transmission over long distance HAS been around for a long time.

You then go on to quote Long range WPT methods.

EMROD | Unleashing power-beaming technology today

With our tech, renewable energy can be generated and sent anywhere. This new tool in the energy transition toolbox is efficient, safe, scalable and reliable.

emrod.energy

The question was regarding a short-range scenario. WPT over long distance isn't very useful because they tend to use radiative/resonant technologies e.g power-beam/LRLPs . Since you then went on to list some short-range tech (i.e inductive coupling rather than far-field methods, magnetic resonant coupling, for example) underneath 'long distance', I thought it could possibly become confusing for OP.

 

[DPG]

The question was regarding a short-range scenario. WPT over long distance isn't very useful because they tend to use radiative/resonant technologies e.g power-beam/LRLPs . Since you then went on to list some short-range tech (i.e inductive coupling rather than far-field methods, magnetic resonant coupling, for example) underneath 'long distance', I thought it could possibly become confusing for OP.

OP hasn't been on here for 2 months so I wouldn't worry too much.

 

[Avo Mk8]

OP hasn't been on here for 2 months so I wouldn't worry too much.

It's an interesting topic though. Wikipedia has a comprehensive article on wireless power, which includes the story that Tesla started to build a 'wireless' power station in 1901 (which unfortunately never came to fruition). 120 years on and we're still working on it