Nokia, Samsung, Foxconn, Hitachi, Panasonic, LG, ASUS, Haier, LiteOn, Toshiba, Verizon, Motorola, Google, HTC, Qualcomm, Sony, Ericsson, Toyota are the few amongst the big names who support qi standard of wireless charging. A company has to pay $15,000 annually to be a part of this group. All Qi devices are tested in any one of the 10 testing stations found here. There are 3 types of formats in Qi, low is for mobile devices, medium – high is for home appliances.
Qi specifications are numbered with three digits: X.Y.Z. For example 1.0.3
- X is called the major revision number. Specifications with the same major revision number are backward and forward compatible.
- Y is called the minor revision number. A change in minor revision number implies that new requirements are introduced while maintaining backward compatibility previously certified products
- Z is called the editorial revision number. Editorial revisions include clarifications, integrate new transmitter designs into one document, and may add new test to the test specifications.
The current version of the Qi specification has version number 1.1.2. Wireless charging, also known as inductive charging, is based on a few simple principles. The technology requires two coils: a transmitter and a receiver. An alternating current is passed through the transmitter coil, generating a magnetic field. This in turn induces a voltage in the receiver coil; this can be used to power a mobile device or charge a battery.
When you leave the wireless charger plugged into the wall socket it only sucks in 0.0001 Watt (100 µW) of power consumption during standby.The efficiency of Qi is at the base 70% when compared to the wires, and that % also increases if the manufacture uses quality components.
The basic principle of an inductively coupled power transfer system is that, It consists of a transmitter coil L1 and a receiver coil L2. Both coils form a system of magnetically coupled inductors. An alternating current in the transmitter coil generates a magnetic field which induces a voltage in the receiver coil. This voltage can be used to power a mobile device or charge a battery.
The efficiency of the power transfer depends on the coupling (k) between the inductors and their quality (Q). The coupling is determined by the distance between the inductors (z) and the ratio of D2 /D. The coupling is further determined by the shape of the coils and the angle between them.
More details can be found here at the Wireless Power Consotorium site.
Coming to the actual Nokia products, DT-900 by Nokia is around $50 but we got it for around $32/€24, this was a great deal! And just the Wireless Charging Case for the Nokia Lumia 720 cost around $32/€23 which is stupidity 🙁 If Qi or any format of wireless charging to come to the mainstream, the pricing has to be low. Off course we are early adopters, we spend money for the latest & greatest in tech. But not everyone does that!
The life with wireless charging is something not yet conveyed, or understood. And dare i say, it can’t be. Unless you use it for yourself, you’ll just think what i have to spend so many $ just to charge it wirelessly when i can do it for free with the wired option i am already having for ages. Once you use it, when you see a friend of your’s use a wired charger, you’ll be like OMG dude, what are you in stone age? You simply can’t go back period. Its difficult to put that feeling in words, but trust us. Wireless charging is a breath of fresh air.
The DT-900 is super lite weight, super efficient low power wireless transmitter. Its very easy to use, just put it somewhere and let it stay there for eternity. Its that simple. Just place the phone on the pad and take it away when you want, its done. DT-900 is available in various colors, and given that it can power any qi compatible device, its not a product you have to consider about buying, its a product you have to invest in. Its almost equal to the wired charging when it comes to charging time. Wired usually gives me around 37% per hour, and DT-900 gives around 32%. That 5% is a well worth sacrifice for the convenience it brings along. In practical timings, it takes about 5-10 minutes extra when compared to the wired counterpart. 4% – 100% of a 2000mah battery undergone around 200 charge cycles charged via DT-900 well within 2 hours flat, which is the same time it takes with a copper wire.
The only catch is do not buy the Nokia Wireless Charging Cover CC-3064 in white, its a dirt magnet. You can’t go wrong with other colors. Its fit & finish is as you can expect from a manufacture & maker like Nokia, its epic. The best fit ever, even better than the hard cases from Rock which is only next to the CC-3064.
Take a look at the videos & photos for unboxing and first thoughts. Go Wireless if possible, you won’t regret it even for a second.
DT-900 in yummy yellow and CC-3064 from N70-1.
The box itself accompanied by DT-900.
A not needed, yet provided huge paper work.
It almost looks like a yellow phone.
Even wires from Nokia looks stunning.
One happy family.
Look who is taking a peak.
The CC-3064 to the left and our old Rock case to the right.