Tt Tautlih

Wireless Charging Q&A - Ask and receive ASAP reply!

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We get asked a lot about the workings of wireless charging technology and I thought it would be nice to create a thread for users if they have any questions about this.

 

One very very common question I get asked is:

 

Q: "Can my iPhone work with wireless charging?"

 

A: Currently, no.

 

 

Feel free to post any other questions you have :)

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Does Xiaomi smartphone support wireless charging ? 

unfortunately not, however, i believe we will see more smartphones come with wireless charging.

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15227_10152349608718182_8044841580364368099_n.jpg

 

1. How does wireless charging work?

Inductive charging (also known as "wireless charging") uses an electromagnetic field to transfer energy between two objects. This is usually done with a charging station. Energy is sent through an inductive coupling to an electrical device, which can then use that energy to charge batteries or run the device.

 

Screen Shot 2014-08-20 at 9.48.24 AM.png

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Does it still works when you have to take a call? How efective it is? How long does it take for a full charge?

As both the receiver and transmitter have to be touching (within 0.4mm) for it to wirelessly charge, holding it up onto your ear will not be possible - although technically not impossible.  Alternatively you can take a call via speakerphone whilst it is charging.

 

Wireless charging is around 10% less efficient than using the cable but only adds approximately 10 minutes or so to your overall charging time with a wire. The difference is minimal.

LetsGetIt1220 likes this

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thurs21.jpg

 

 

Not all smartphone devices are compatible with wireless charging, but the ones that are either have the following:

 

1. Inbuilt wireless charging receiver

2. Require a separately attached wireless charging receiver 

 

Current smartphone devices compatible for wireless charging can be found here - http://bit.ly/1oThQDm

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Benefits:

1. Simple and easy to use

- Simply place your compatible device on the wireless charging pad to begin charging automatically. It is as easy as that!

 

2. Removes the need for wires/cables

- Tangled and messy wires say goodbye, as well as the hassle of searching/rummaging to find it!

 

3. Globally adopted 

- As wireless technology matures and develops, more and more devices will become compatible meaning that you will not need to worry about different power adaptors or cables for your different devices.

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There is not just one wireless charging standards but several.

 

The Big Three

1. Wireless Power Consortium (Qi)

2. Power Matters Alliance (PMA)

3. Alliance for Wireless Power (A4WP)

 

 

So what's the difference? Let's take a look.

 

1. Wireless Power Consortium (Qi)

Current King of wireless charging with more than 200 industry members that include the likes of LG, Nokia and Verizon and currently has the most market share in terms of industry global distribution.

 

The Qi wireless charging standard is one that has come to the market earlier than some others. It is basically what is termed and inductive system using a relatively low frequency (between 110 and 205 kHz for the low power and 80 to 300 kHz for the medium power) for the power transfer.

 

 

2. Power Matters Alliance (PMA)

Making headlines in recent times for incorporating wireless charging in select Starbucks stores in the US.
Litltle bigger than A4WP with current focus on consumer "pull strategy" with companies trying to build in support for wireless charging standard
 
 

3. Alliance for Wireless Power (A4WP)

Uses a different power transfer technology called 'Rezence' that uses magnetic resonance, which is pretty much the opposite of magnetic induction charging that claims to have better wireless charging capability with multiple devices and devices with different layers ie. with protective covers.

 

The A4WP wireless power standard was developed a little later than the Qi standard. It uses resonance techniques along with a higher power transfer frequency of 6.78 MHz for the power, and 2.4GHz for the control signals. It also allows simultaneous charging of multiple devices

 

 

What is the actual difference between Qi and PMA?

Qi and PMA both use inductive charging, but the differences are that Qi’s wavelength is 100-205kHz and PMA’s is 277-357kHz. Otherwise, the method itself is the same. 

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Battery cycles on Li-Ion are different than older batteries or even say the newer NiMH.

Every battery has a finite number of cycles. For older style batteries (NiMH, Lithium, NiCd, alkaline, etc...), even if you just charged the batter from say, 30% to 50%, that would count as one cycle. One cycle = charging from 0-100%.

 

Li-Ion don't suffer from the same memory problems. Li-Ion really don't have a memory/cycle, per se, but to make the best sense of how Li-Ion "cycle" works, think of it as 1 cycle = sum of charges too equal 100% charged.

 

For instance, if your phone got down to 10% and you threw it on the charger until it got to 50%, let it drain down to 20%, then put it back on and charged it to 70%, let it drain down to 40%, then charged it to 50%, that would equal one cycle.

50-10 = 40%.

70-20 = 50%.

50-40 = 10%

40% + 50% + 10% = 100% = one Li-Ion cycle

 

In addition, Li-Ion have a lower self-discharge (charge loss while stored) rate.

You should expect near zero loss in capacity for the first 500 cycles. After that, Li-Ion batteries will produce around 80% of its original capacity.

 

The overall answer is:

 

No, there is no chance of overcharging and it will not affect your battery life or performance by constantly charging your device.

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- Wireless charge your device on your desk at work, whether your in the office or the own of a small coffee shop

- Place on your bedside table and charge your device when you go to sleep, for it to be ready and raring to go the next morning

- Place in your living room bench on a selected area, so you'll always know where your device is, and in the knowledge that it is fully charged

- Clean and tidy space with no wires/cables to tangle your lifestyle up 

 

:)

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