Charging Mobile Phones via Bluetooth

I would first investigate whether a Bluetooth signal can carry sufficient mA to charge the cellphone battery within a reasonable time. I doubt it, but I don't know.

Maximum RF power for a Class 1 Bluetooth transceiver is 100mW. 

GA

You beat me to it!

I cannot imagine that you could build an antenna (large coil of wire with special diodes to rectify and a reg. chip...) to develop enough energy to allow charging via bluetooth.......You might achieve it if you design for 50/60Hz and lay the coil on or near a mains cable.......just a thought!!

But where is the point, most phones you just connect it to a PC/Laptop via a USB cable (€2,00) and it charges perfectly.....I have one for the 12 volt car cig. lighter socket that works great too €3,99 from Aldi Germany.....the development work for Bluetooth (and the size of the finished unit to carry a big enough coil/antenna!) will cost more than buying a few cables.....

To my knowledge you cannot modify an existing cell phone's software to allow it to recharge its battery via a wireless signal, let alone by Bluetooth (cell phones and Bluetooth do not work this way).

Have a really close look at the operation of Bluetooth and Bluetooth-equipped cell phones for more details before going any further, as there may be a way with a small modification in both hardware AND software (but don't expect this to be a simple project at all that can just be done using software alone).

TRYING FOR software.......one used in cell phone and another for laptop......sothat both gets easily synchronised. medium is also a problem. give few more opininon on this technology.

What needs to be synchronized in the transmission of DC power, as for charging batteries?

There, I just gave myself an OT to go with yours.

Go ahead and dream. Think outside the box.

Good luck with your project.

So, does this mean that I can recharge my cell phone while I reheat my pizza?

More than likely , but it may also fade your genes..LOL

At least, stop calling when recharging

Why don't you develop an crystal radio type of receiver that can automatically tune to the strongest RF signal? this can be attached to the bottom of phone or you can make a drop in cradle.

Maybe it is available already.

This can be redefined and extended to mean: How can a low power HF signal be practically rectified?

This has been done for radio broadcasts where the rectifier was situated not too far from the broadcasting antennas. There are rumors that the rectifier-enterpreneur was successfuly sued by the broadcasting authority.

A hardware solution for Bluetooth seems (without calculation) to be like lifting yourself by pulling up your shoelaces. Too much energy will be used for the rectification itself to have anything left over.

A software solution involves rewriting parts of an operating system. It will probably not be encouraged by phone makers and companies.

The efficiency of hardware solutions for available electromagnetic fields can be calculated by first measuring field strengths at optimum directions (EM field strength meters are easily available and not too expensive). 50 or 60 Herz fields are all over the place.

A 'no plug' 'universal' charger using this principle for 'zero' distance from the source is rumored to be commercially available.

I'd suggest using an energy storage mechanism with zero internal leakage, 100% efficient power conversion electronics and a very long charging time.

Somebody mentioned 100mW as the max radiated energy, which would be spherical. The cellphone antenna would occupy a small fraction of the sphere. It might thus receive energy in such units as μW, pW, or even fW. Loooong charging time, indeed!

I imagine in the case of fW the charge store loss of the battery would never be overcome and it would never charge.

Yeah, that was the low end of the estimates, but I got on a roll and couldn't stop. But posters to engineering forums ought at least to be aware of basic arithmetic....

Sorry it cant be done from inside the phone.

you cant have power leaving the battery and going into the battery from the same circuit pick up.

there would be no way to program a phone to do this.

the only way you could do it would be to make a blue tooth receiver recitfyer charger to fit onto the charging port, but it would consume as much power as it receives, so would be a pointless excercise and even if it did work at such low power levels it would take months to charge, you would do better to have a solar panel on back of phone so you could leave it in the sun to charge, much simplar and cheaper.

Trust me the is now way to program a mobile to charge itself via bluetooth.

From past post i would say you have a very active mind, Which is good but you need to understand how things work better so you can improve them, I am sure you will evetually hit on an idea, Also if its a really good idea and stands a chance of working, Posting the idea on here would be the last thing i would do, As it would be open to theft, Anyone could improve on the idea and patent it and you would lose out.

Do more research on how the devices work then try to improve on them.

http://www.google.co.uk/search?q=bluetooth+power+consumption&sourceid=ie7&rls=com.microsoft:en-gb:IE-SearchBox&ie=&oe=&rlz=1I7DKUK_en-GB&redir_esc=&ei=XkHxS6PnBJiZ_QaeksXmBg

power consumption.

Now this is what i mean by research, I have done a quick search on power consumption, as i have no idea of how much power a Bluetooth device draws, After looking at a few sites i came up with this link which shows results of power consumption tests.

From the data on this site it would appear a blue tooth dongle on a pc draws about 99 MW now using this information it is reasonable to assume a similar power draw would be taken from a mobile phone this would mean the Bluetooth device is drawing as much power as its receiving making it totally useless as a charger.

http://www.tomsguide.com/us/squeezing-more-life-out-of-your-notebook,review-583-26.html

more results from research.

Consumption of power from a Bluetooth device on a mobile phone you will see with blue toot turned on and receiving it consumes 400MW which is way more than is being transmitted so it really is a complete waste of time.

http://mobiledevices.kom.aau.dk/research/energy_measurements_on_mobile_phones/results/data_communication/bluetooth_different_status/

not even CLOSE to being possible. Your problem is not software but fundamental physics.

hello sir i am doing btech and also want to make a hardware which do the both charging as well as bluetooth work

Good luck, you better team up with Marijan Pollak.

..few days before i was aroused wid same idea ..and today whn i searchd fr the consent got ur post.. wat i think is that we must go step wise. i.e..the foremost principle must be transmisson of dc charge via bluetooth..ryt in the begning dnt woryy abt celphones software and supports.. ...the necessity of dc charge synchronization must be in mind..and the capability of blutooth being 1oomw..but it has limitations for the working result..as in the cae of bluetooth audio or trabsmission of datas while surfing net via a bluetooth enabled phone theres a lot to learn from..and i guess with few alteration we can make cahrge transmit..

hello sir even m plang same 4 my project so i ned ur help regarding dat.....

Just to make sure that everyone on this platform understands each message we use English, so I suggest you start with learning it.

Sorry if it sounds rude but at least try to use existing words and avoid weird abbreviations. There is a spell checker on the editor for a reason.

On the subject: just try to understand the difference between USB and Bluetooth, just picture it once.

Keep charging your phone via Wi-Fi and leave Bluetooth alone.

Hey you guys !! I love this topic of conversation. You might wanna check this out:

http://syzygyastro.hubpages.com/hub/The-Rectenna-for-Remote-Fuelling

Say hello to my always present friend TESLA !! Real genius of all times. I had word that in US it is possible to find real RECTENNAs able to charge ANY MOBILE DEVICE. I mean TODAY, not in 20 years. I think we will have soon a total revolution in this area, due to highly fast development of NANO-INDUSTRY. Stay tunned to say BATTERies GOoD BYE !

Can you imagine the industry of electric cars ?

Hi folk,

I'm just trying to develop a software which make a mobile phone charging via connecting on Bluetooth with laptop. Need some ideas for my betterment.

Thanx

___________________________________________________________________--

Hello sir

I am a first year (ECE) student at The LNMIIT. Today I attened a workshop on the RF antenna organised under the ieee student chapter.

During this workshop I thought about the idea of charging mobile fone thru Bluetooth. I searched on net and came across your post.

I am really interested in the topic. But being a first year student i lack support and guidance. I would be really greatful to you if you could guide me.

Looking forward for your reply.

I am not aware of any changes since I last posted almost two years ago (see post #3). You cannot do it with software alone.

It may be possible to construct a separate charger similar to the charger that plugs into the wall (the local grid supply) but instead receives its power from the wi fi signal, however it is a rather advanced HARDWARE and RADIO project, not a software project.

When you would have read through the blog you will have noticed some sceptism.

After all it is indeed possible to harvest energy from electromagnetic radiation;

These devices are called radio.

But the harvest is limited. For this reason radio's are equipped with amplifiers that multiply the energy in the signal. (the antenna construction is the first step)

When you are a first grade student you will certainly be able to do the mathematics on the available enery for the surface the bluetooth antenna has.

Start reading different websites on the technology and work though it, much more fun that requesting professionals the route to follow and it might bring you an idea that is new and works.

ps: remember not to forget to keep the sceptism level high when surfing the internet. This domain is part of the bigger thermodynamics domain, and the laws are valid at any moment (for sure the zeroth law)

Please see the following link.

http://reviews.cnet.com/8301-19512_7-20071452-233/apple-applies-for-wireless-charging-patent/

it is about the wireless charging of ios devices by apple.

Yes, but have a closer look at the link - the technology is a proprietary wireless hardware and software solution built in to both the computer and the wireless device to enable wireless charging.

It is not a software or even hardware add-on package that uses conventional Wi-Fi, cellular or radio signal power transfer. This is a major design change to future wireless product lines as well as an additional hardware package to be connected to the computer, all using proprietary form of high power wireless near field magnetic resonance to perform the actual power transfer.

This type of developing technology has been around for a while and will become more and more common for mobile devices.

Resonant inductive coupling

Wireless energy transfer

Jack - Actually met and discussed high power wireless near field magnetic resonance with Professor John Boys and Professor Grant Covic in the late 1990's.

Wireless charging is not a big issue, my toothbrush does it.

but using the all available EMC noise as source is another story.

Even cars can be wireless charged.

sir

i m a student of electonics & communication......

i dont know more about this. but i think we can use a power amplifier(which amplifies the power of the signal while phone recieves a signal) in the main supply. that means one more device we can place in the main which can have a display for connection purpose and can amplify the amount of power required to charge the phone.....

Well this is all very inspiring and even utopic for me. In my opinion I think, almost anyone with enough time, force of will and a bit of money can surf the web and investigate and finally build an enough big home made rectenna wich could get EM energy from RF signals all around the local area and charge the cellphone's battery. Unfortunately, at least me, can't achieve enough ultra-advanced nanotechnology in order to nano-reproduce the rectenna in nano scale size (let alone calculate behavior of EM energy on such a small components) and put it inside an SMD micro-chip inside a cellphone and at the same time ensure to the public that such an invent won't expose them to even more radiation than today's cellphones. That why I think the investigations in neutrinos and additional dimensions in the LHC laboratory is so important. I think that we are at the doors of a new range of frequencies and sounds not yet well understood and possibly unharmfull to people wich could lead to a whole new range of potential technologies that were always there waiting for us to discover it ( May be such technology existed...before, thousands, even millions of years...archaeologists discover proofs of that every day, everywhere...).

The important thing, I think is not the advance in technology (ONLY), but the advance of us as humans. Let's take a moment to analize what has been of us as humanity as the technology started to grow until today. You can see people still have the same devils they have thousands of years ago. The technology IS a knife handle by kids. And the knife is becoming bigger and more dangerous everyday. God bless you all.

I was searching for a same topic of research and suddently came across these blogs. Thanks for sharing all the details. I want to know that if someone is still working on this project or if there is any progress, can u please share it with me. My mail ID is ghosalsabyasachi1@gmail.com. I will be very eager to know if someone has found anything ineresting already. Thanks in advance.

Probably not, as you can understand by reading more of the replies.