2018 iPhones May Feature Faster and More Efficient Wireless Charging With Switch to Copper Coil

A translated China Times report today claims that the wireless charging coil on at least one of Apple's widely rumored trio of 2018 iPhones will be made from copper wire instead of FPC, short for ferrite polymer composite, allowing for both faster and more efficient wireless charging from a technical standpoint.

iphone x wireless coil

iPhone X's wireless charging coil visible under X-ray via iFixit/Creative Electron

Essentially, the report claims that Apple will be switching from thinner FPC coils with higher resistance to thicker copper wire coils with lower resistance for the wireless charging receiver built into iPhones.

Since high power and high efficiency are the trend of wireless charging, it is expected that at least one of the three iPhones in 2018 will abandon the FPC to adopt a copper coil solution to achieve the above goal, and because the copper wire coil resistance is small. It can also offset the thermal effects generated by the increase in power.

The reduced resistance would allow Apple to increase the power threshold that iPhones can safely handle via wireless charging, without overheating, which could result in faster and more efficient charging via Qi-certified mats, although this would still depend on the wattage that a particular mat outputs.

For context, FPC is a mixture of iron, at least one other metal, and plastic, whereas copper is a more pure material. Both have electromagnetic induction properties, making them suitable for wireless charging coils.

The latest iPhones support wireless charging at up to 7.5W, which actually isn't much faster than wired charging with a 5W power adapter, due to the efficiency limitations of the FPC coil. The switch to copper would yield improvements, assuming that Apple found a way to fit the thicker coil in its next iPhones.

Apple is expected to unveil its 2018 iPhones at Steve Jobs Theater in September, but the company has yet to announce a date for the event.

Related Roundup: iPhone XS

Top Rated Comments

WiiDSmoker Avatar
33 months ago
All these minor improvements are shaping up to be an overall major improvement. Faster wireless charging, faster and more reliable LTE, faster processor, possibly more RAM, etc.
So the normal upgrade path.
Score: 12 Votes (Like | Disagree)
macduke Avatar
33 months ago
I have wondered about this in relation to AirPower. I think they delayed it because they wanted to release it with higher output levels, but that would give away features in future devices. If there is only one device which gets it, it will probably be the iPhone X Plus as it would have more room inside for a thicker charging coil.
Score: 9 Votes (Like | Disagree)
BvizioN Avatar
33 months ago
I have no doubts faster charging would be beneficial for many many people. Myself i place my iPhone X every evening before I go to bed on the charging matt and pick it up in the morning, During that time I sleep wouln't care how fast it does it. But when I am travelling, if I am running low on battery obviously it would be great it if it would charge quicker.
Score: 5 Votes (Like | Disagree)
liberte1776 Avatar
33 months ago
How crappy that Apple did not give faster wireless charging in iPhone X, like the competition offers! *rolls eyes*
Score: 5 Votes (Like | Disagree)
69Mustang Avatar
33 months ago
Would this work with standard Qi chargers or would this need a new, more powerful Qi "plus" mat; or worse - Apple's own proprietary charging mat?
There's no need for more powerful mats. Chargers routinely offer up to 15W of charging power. The 7.5W limitation on iPhones was Apple's choice. Initially it seemed weird that iPhones charged at such low power versus other phones. The material in the coil makes that decision more clearly understandable... if the rumors are true, of course. It seems Apple was using a bit of caution with tech they'd never previously used in phones.
Score: 5 Votes (Like | Disagree)
calstanford Avatar
33 months ago
It's really ridiculous how Apple messes these things up. They're 5 years late on Qi and now they realise they haven't put copper in? Every other manufacturer has done this year ago. You can charge a Samsung twice as fast in 2015 than you can charge an iPhone in 2018.
But hey - just spend another $1000 this year to get the real real iPhone X/8. The one we should have released last year.
[doublepost=1534781509][/doublepost]
As an electronic engineer I’ve always found the S versions a lot more interesting.

I’ve upgraded 3GS > 4S > 5S > 6S and I’ll likely get this.

This TSMC 7nm processor should be something to behold, Apple has really impressed me with the A-series chip design. Probably the best all round, most efficiently design chip in the world of smartphones.

I’m hoping Intel’s XMM 7560 is a good improvement over last years slightly lacking modem, I’d still rather have a Qualcom X20. Also Band 71 support hopefully.

Better FaceID, $100 cheaper, better camera, better wireless charging, new 18W fast charger with USB-C at one end.

Personally they all look like black slabs which is fine for me, it’s what’s inside that really gets me interested.
You do realise you missed out on the last S, right?

After the 6S came the 7. The "7S" just happens to be called 8.
Score: 5 Votes (Like | Disagree)

Top Stories

microsoft edge ios android

Bill Gates Says His Preference for Android Over iPhone is Due to Pre-Installed Software

Friday February 26, 2021 3:35 am PST by
Microsoft co-founder Bill Gates this week participated in his first meeting on Clubhouse, the increasingly popular invite-only conversation app, where he fielded a range of questions as part of an ongoing book tour. Gates was interviewed by journalist Andrew Ross Sorkin, and given that the Clubhouse app is currently only available on iOS, naturally one of the questions that came up was...
Top Stories 47 Feature copy

Top Stories: MacBook Pro, iMac, and AirPods Rumors, macOS 11.2.2, MagSafe Wallet Revisited

Saturday February 27, 2021 6:00 am PST by
March is right around the corner, and that means our first good opportunity for Apple product launches in 2021 as the company frequently has significant launches in March or April each year. We're hearing rumors about MacBook Pro, iMac, AirPods, and more, although many of these will be coming out at different times over the course of the year. This week also saw a macOS update to address a ...
iphone 6 in hand

Apple Faces Another iPhone Lawsuit Over 'Programmed Obsolescence'

Monday March 1, 2021 6:44 am PST by
Apple faces a new class-action lawsuit that accuses it of deliberately releasing iOS updates that slowly reduce the performance of an iPhone, forcing customers to upgrade their devices. The lawsuit comes from the Portuguese Consumer Protection Agency, Deco Proteste (via Marketeer), which in a statement says that it will proceed with a case against the Cupertino tech giant because it...
maxresdefault

HomeKit Essentials Worth Checking Out

Saturday February 27, 2021 7:05 am PST by
HomeKit was slow to take off after its 2014 launch, but now that it's been around for seven years, there are hundreds of HomeKit products available, ranging from doorbells and speakers to TVs, lights, and cameras. In our latest YouTube video, we rounded up some of our favorite HomeKit products that we find most useful. Subscribe to the MacRumors YouTube channel for more videos. HomePod...
First Look Big Sur Feature2

Apple Releases macOS Big Sur 11.2.2 to Prevent MacBooks From Being Damaged by Third-Party Non-Compliant Docks

Thursday February 25, 2021 10:07 am PST by
Apple today released macOS Big Sur 11.2.2, the fourth update to the macOS Big Sur operating system that launched in November. macOS Big Sur 11.2.2 comes two weeks after the release of macOS Big Sur 11.2.1, a bug fix update. The new ‌‌‌‌macOS Big Sur‌‌‌ 11.2.2‌ update can be downloaded for free on all eligible Macs using the Software Update section of System Preferences....
iphone 12 pro display video

iPhone 13 to Include 1TB Storage Option and LiDAR Across the Board, Says Wedbush Analyst

Monday March 1, 2021 4:00 am PST by
Apple's forthcoming iPhone 13 could include a 1TB storage option for some models and LiDAR Scanners across the entire lineup, according to a report from Wedbush analysts. In a new note to investors, seen by MacRumors, Wedbush analyst Daniel Ives said that initial Asian supply chain checks gave the firm "increased confidence" that Apple's 5G-driven product cycle would extend well into 2022,...
flat mbp 14 inch feature yellow

Redesigned 14-Inch MacBook Pro Expected to Feature Brighter Mini-LED Display With Slimmer Bezels and More

Thursday February 25, 2021 7:48 am PST by
Apple plans to unveil new 14-inch and 16-inch MacBook Pro models with Mini-LED-backlit displays in the second half of this year, according to industry sources cited by Taiwanese supply chain publication DigiTimes. The report claims that Radiant Opto-Electronics will be the exclusive supplier of the Mini-LED backlight units, while Quanta Computer is said to be tasked with final assembly of the...
mac mini developer transition kit photo feature

Apple Requiring Developers to Return DTK Mac Minis by March 31

Friday February 26, 2021 3:57 pm PST by
Apple today sent out emails to developers who are in possession of a Developer Transition Kit, asking them to return the machines by March 31. The Developer Transition Kits are Mac minis with A12Z chips that Apple provided for development purposes ahead of the release of the M1 Macs. Apple in the emails provided developers with shipping instructions, and plans to begin collecting the DTKs...
iphone 12 120hz thumbnail feature

Kuo: iPhone 13 Lineup to Feature Smaller Notch and Larger Batteries, 120Hz Display for Pro Models, and More

Monday March 1, 2021 7:50 am PST by
iPhone 13 models will all feature a smaller notch, while the two Pro models will be equipped with low-power LTPO display technology for a 120Hz refresh rate, analyst Ming-Chi Kuo said today in a research note obtained by MacRumors. Several other sources have previously claimed that some iPhone 13 models will support a 120Hz refresh rate, including display industry analyst Ross Young, leakers ...
unc0ver version 6 release

Jailbreak Tool 'unc0ver' 6.0.0 Released With iOS 14.3 Compatibility

Sunday February 28, 2021 9:26 am PST by
The team behind the "unc0ver" jailbreaking tool for iOS has released version 6.0.0 of its software, which can allegedly be used to jailbreak any device running iOS 11.0 through iOS 14.3 using a kernel vulnerability. The unc0ver website describes how the tool has been extensively tested across a range of iOS devices running various software versions, including an iPhone 12 Pro Max running iOS ...