editor's blog
Subscribe Now

Wireless Power Progress: Efficiency and Distance

We met PowerByProxi recently when discussing wireless battery charging options. Well, they’ve recently announced what they claim to be a couple of milestones both in distance and charging power.

The distance metric has them able to charge in the “z” direction up to 30 mm away. That’s 3 cm; roughly an inch and a half. Which doesn’t actually seem that far, but, critically, since they can penetrate various construction materials, this means they can go through counters and tables (much as we discussed in the WiTricity case).

More significantly, they’ve upped their charging power to what they say is an industry-leading 7.5 W. Those of you who know phone power systems in detail may note that, at least as PowerByProxi tells it, the power management ICs (PMICs) throttle wireless charging power to 3.5 or 5 W to avoid overheating. (No such limit is placed on wired charging.)

Given that fact, you might wonder how PowerByProxi tested this out (short of designing their own PMIC): they did it by adding a dummy load to the phone to pull extra power. Their goal is that, by demonstrating 7.5-W charging (per receiver, or device being charged), future PMICs can eliminate the limit, allowing faster charging.

They also announced a “personal charger” in the shape of a bowl. This was a prototype demonstrating that phones or wearable gadgetry could be simply dropped into the bowl, without any careful positioning, and they would be properly charged.

They’re targeting this for the new Qi v1.2 protocol, which uses the lower-frequency 200 kHz range, even though PowerByProxi makes charging systems at other frequencies (they’re not firmly wedded to one format).

You can read more about their developments in their announcement.

Leave a Reply

featured blogs
Jul 6, 2020
If you were in the possession of one of these bodacious beauties, what sorts of games and effects would you create using the little scamp?...
Jul 3, 2020
[From the last episode: We looked at CNNs for vision as well as other neural networks for other applications.] We'€™re going to take a quick detour into math today. For those of you that have done advanced math, this may be a review, or it might even seem to be talking down...
Jul 2, 2020
In June, we continued to upgrade several key pieces of content across the website, including more interactive product explorers on several pages and a homepage refresh. We also made a significant update to our product pages which allows logged-in users to see customer-specifi...

featured video

Product Update: What’s Hot in DesignWare® IP for PCIe® 5.0

Sponsored by Synopsys

Get the latest update on Synopsys' DesignWare Controller and PHY IP for PCIe 5.0 and how the low-latency, compact, power-efficient, and silicon-proven solution can enable your SoCs while reducing risk.

Click here for more information about DesignWare IP Solutions for PCI Express

Featured Paper

Cryptography: A Closer Look at the Algorithms

Sponsored by Maxim Integrated

Get more details about how cryptographic algorithms are implemented and how an asymmetric key algorithm can be used to exchange a shared private key.

Click here to download the whitepaper

Featured Chalk Talk

Electronic Fuses (eFuses)

Sponsored by Mouser Electronics and ON Semiconductor

Today’s advanced designs demand advanced circuit protection. The days of replacing old-school fuses are long gone, and we need solutions that provide more robust protection and improved failure modes. In this episode of Chalk Talk, Amelia Dalton chats with Pramit Nandy of ON Semiconductor about the latest advances in electronic fuses, and how they can protect against overcurrent, thermal, and overvoltage.

More information about ON Semiconductor Electronic Fuses