Wireless charging

---

Has anyone looked at the following product for wireless charging (ala Powermat)?

It doesn't look like it outputs a lot of power, but for overnight / sitting on the work desk type of charging, it may be adequate.

www dot seeedstudio dot com/depot/wireless-power-supply-p-701.html

Would be interesting to see if it could be nicely integrated into a phone cover.

I think I will order one to play with even though I am not a developer or a hacker or anything like that!

I've seen charging coils like that hacked into existing devices. There are also, on the horizon, self contained batteries that have the inductive charging built in - upgrade any device to wireless charging! (any device with enough volume to justify making such a battery, anyway)

This definitely could work quiet well for that sort of application. I think it is a bit larger than you would hope but if you put a usb connector on the end I think it would work really well.

Yap, but there are limitations.

Loss of energy
Less efficiency
Low amp ratings
Interference
Bulky.

Goods are

Wireless
No need of conectors that opens to external world( for devices with built in coils)
No connector problems like damaged port,loose contacts etc.


Sent from my HTC HD2 using xda premium

Originally Posted by giritrobbins

This definitely could work quiet well for that sort of application. I think it is a bit larger than you would hope but if you put a usb connector on the end I think it would work really well.

That is the $64 problem! Trying to get USB connectors without the need to butcher an existing USB cable. Ideally, I would like to have a double ended USB connector - a male microUSB to plug into the phone, and a female micro or mini USB on the other end - to allow a USB cable connection between the phone or external charger. I know that I could buy from Digikey a male micro USB connector, and a female connector. But these connectors do not come with casings, so any use of them probably wouldn't look pretty without many hours of thought and effort.

I am assuming (without having this charger in my hands with the specifications) that I would probably need to have one or more diodes in-line with the receiver wires to stop external source current entering the receiver and possibly damaging it.

I haven't read up on Li-Ion cell phone batteries and how to keep them efficient. So I don't know whether these batteries can live long term on low current charging, or whether they would need higher current (as from manufacturer provided chargers) to provide efficient long term output.

Induction charging is being used in several applications already, like WII remotes and such. The problem is, as stated above ^^^^ I'm not really sure how lithium ion batteries stand up so such charging, (almost trickle). I know that the batteries used in Wii remotes are Nickel Hydride though.

Originally Posted by DMPinBC

That is the $64 problem! Trying to get USB connectors without the need to butcher an existing USB cable. Ideally, I would like to have a double ended USB connector - a male microUSB to plug into the phone, and a female micro or mini USB on the other end - to allow a USB cable connection between the phone or external charger. I know that I could buy from Digikey a male micro USB connector, and a female connector. But these connectors do not come with casings, so any use of them probably wouldn't look pretty without many hours of thought and effort.

I am assuming (without having this charger in my hands with the specifications) that I would probably need to have one or more diodes in-line with the receiver wires to stop external source current entering the receiver and possibly damaging it.

I haven't read up on Li-Ion cell phone batteries and how to keep them efficient. So I don't know whether these batteries can live long term on low current charging, or whether they would need higher current (as from manufacturer provided chargers) to provide efficient long term output.

I have heard rumours of the device killing batteries. It would be interesting to see how much of the power actually gets to the unit. The wireless power supply you linked in your OP shows a rating of 300-400 mA. That means the average battery would take 3-4 hours to charge from dead if all that power was indeed making it's way to the battery. Not really a trickle charge is all that power makes it to the battery.

All lithium ion battery assemblies have built in circuitry to prevent overcharging, overheating, and possible explosion/fire. The charge circuitry will turn off when fully charged and there's no penalty for topping off a LIon battery without discharging. Hacking a USB cable isn't all that complicated although may not be pretty depending on how well it's soldered together. There will always be a lump in the middle of the cable where the connections are made but you could use sleeving to hide it.

I tried an OEM non branded wireless charger, and after 6 hours of charging, my iphone's battery only increased around 20%...

Anyone tested this on Desire HD?