We know that an automatic watch winds itself via movement of wearer's hand.
Why not smartphones can't be charged like that?
Even if phone requires much more juice than watch, at least this mechanism can augment battery power and will provide some respite if battery dies.
Is it engineering impossibility or deliberate action for commercial reasons?
|
To charge a typical phone battery to 50% capacity in five minutes (about the longest time I'd consider winding a charger) would require a power input of ~100W. <-- That's in an ideal world, which doesn't exist.
Imagine generating enough power to light a 100W bulb with one hand (arm?) and you'll appreciate why these chargers aren't in the shops! The other reason is that the technology to charge a battery at this rate doesn't exist commercially at present*.
Nice idea though.
* The best we can do for phones is 20W with specialised technology in the phone and the charger itself, and this requires active control and intervention from the smartphone's CPU. See Qualcomm's Quick Charge 2.0.
|
May 12th, 2014 by Tina Casey
An international team of researchers has come up with a recipe for a microscale flexible energy storage device made of graphene and carbon nanotubes, which can store enough energy to rival the gold standard, lithium batteries. That’s significant because the device is actually not a battery, it is a supercapacitor that can charge and discharge much faster than a battery.
There is talk of charging a mobile phone is less than 5 minutes. Imagine if that could work for an electric car with a graphene battery!
|
>> To charge a typical phone battery to 50% capacity in five minutes (about the longest
>> time I'd consider winding a charger)
>>
He's not suggesting winding the charger by hand. He's saying why can't it trickle-charge at a very low rate, continuously, by using the same oscillation principle as an automatic watch?
|
|
I'd suggest a 'phone doesn't experience the same amount of movement as a wrist (no onanism quips, please) as it tends to be in a pocket or clamped to an ear. I understand the self-winding mechanism of a watch requires a deal of wrist rotation.
|
|
The energy required by a smartphone is massively more than a self winding phone. Most is wasted as heat.
|
We both have Galaxy S3's and mine seems to go flat far quicker than Ian's even when neither of us are using them. Mine is a pain to get to contact to mobile data and I spent an hour on Sunday trying to get it to connect ( from Ashford to Dartford) to see what the queue was like at the tunnel so we could go via Blackwall.
Never did get it to connect before we joined the back of the queue.
I would love my Nokia 6310 back.
All those years living in a lorry I managed just fine with a lappy and dongle and never had a problem getting online.
Pat
|
>> I would love my Nokia 6310 back.
If you mean a Nokia 6310i, as in the one that had a green screen and lasted forever, why not get one again? I have a spare one doing nothing somewhere. I'm sure it still works fine.
|
Be careful, there were a lot of fake copies around at one point. Not sure how to tell though.
I have a draw full and several car kits as I was using them in 4 cars interchangeabley until about 2 years ago. Mrs S however found they would not fit the handbag:( and insisted on something more modern.
I dont know why I bothered to spend the money, the new phone is either never on, out of earshot or flat :)
|
That's the one rtj.
Unfortunately I need to access BT Cloud when I'm working and as it entails wandering around a busy haulage yard to find a signal, it's easier on the S3 than with a laptop!
I turned WiFi off yesterday while I was at home and the battery stayed up a lot better.
I also use speech to text a lot which I couldn't do on the Nokia.
Pat
|
Winding phones like watch - Fursty Ferret
