Wireless Charging Interoperability Test Results and Analysis

Wireless Charging Interoperability Test Results and Analysis


It was said that wireless charging would be introducing into Apple next generation while there was also news that Apple Inc. had just joined Wireless Power Consortium (WPC) as its new member. As Apple has always been one of market leaders in the industry, such news coming one after another seems to indicate of the market booming and technology development rising into its high peak for the wireless charging that has been regarded as emerging technology for a period of time.

According to the research of IHS Markit, the worldwide wireless charging- transmitter (Tx) & receiver (Rx) market in 2017 are expected to be totally over 600 million units of shipments and would be driven even over 3 times more to reach 2.8 billion units in 2025. From Chart I, we learned that in this market the surging shipments of devices featured as receivers for wireless charging, such as smartphones and smartwatches, have become the main force of wireless charging market and has further driven the increases of the transmitter market.

Read more

[The Allion Perspective] The Next Step In Wireless Charging

As children we have all dreamed of having super human powers such as “Bishop, Jean Grey (Phoenix Force), Dazzler (respectfully)”. Although we’re still far from casting our own lightning bolts; however, with the development of wireless charging technology we can in a way satisfy a minuet aspect of this dream.

In 2018 the Apple iPhone may adopt wireless charging with its possibly new fiberglass shell; however, if such an adoption were to take place it would undoubtedly spar an array of exclusive aftermarket chargers causing confusion and risk of interoperability. Also from our observation of IFA 2016, the majority of future wearable devices would equipped with dust & liquid repellent features.

Read more

CES 2014 Part II: The Alliance of A4WP and PMA Holds-up WPC Three Competitors Arise in Wireless Power World

      CES2-1         CES2-2 

Alliance for Wireless Power (A4WP) has launched its certification mechanism,“Rezence”, the official brand of wireless power technology in CES 2014. Apart from overcoming the first generation material and distance limitation issues, the optimized magnetic resonant techniques of Rezence empower multiple devices to charge simultaneously within a wider and longer charging distance and also provide more flexibility to increase wireless power scenarios. However, A4WP and PMA (Power Matters Alliance) signed a cooperating memorandum, together working on the development of two charging modes. The news is undoubtedly a bombshell for WPC (Wireless Power Consortium) who has comparative advantage of membership and product numbers in the wireless power market. To get more details of developments of the three dominating wireless power alliances, please refer to the link of Allion Labs technical trend, “Wireless Charging Powers Up Unlimited Future.”

An intensively competitive era comes along with the three dominant competitors arise. Technical theories of the three wireless alliances are originally different. Incompatibility among alliances and products perplexes and limits the consumer market. As to the wireless industry, the issue impedes the developments of both magnetic induction and magnetic resonance; it may lead wireless charging standards into a hydra-headed situation.

The current trend indicates that WPC has the most members and smoothly pushes the schedule to the market. Besides, WPC is undertaking the standards for wireless charging, striding into the potential magnetic induction and magnetic resonance futures. Its aggressive movement inevitably threatens A4WP, the magnetic resonance advocate and PMA, supporting magnetic induction individually. The threat indirectly created the cooperation opportunity between A4WP and PMA, accelerating the technology incompatibility and trying to balance the situation dominated by WPC.

It’s worth mentioning that the standards for wireless charging “Qi,” promoted by WPC, has its limitations of distance, below-5W charging, frequency overlapping with some other applications, easy to interfere with, and the inefficiency and the instability of the whole operation process (Upon this issue, Allion Labs has evaluated the performance of WPC wireless chargers, please refer to the complete report link: The New Era of Unlimited Battery Charging Technology: Allion Wired & Wireless Charging Test & Evaluation Report). On the contrary, through alliances, A4WP and PMA have turned to high frequency channels, taken advantage of Bluetooth 4.0 and Near Field Communication (NFC) techniques, and contributed to the development of multi-mode. In particular, A4WP is the first regulator of magnetic resonance, initiating the standards for wireless charging “Rezence’ while PMA provides the indoor convenience for the users in Starbucks and McDonald’s by widely installing the wireless charging pads. In other words, two alliances take the lead in wireless charging for the end-user market. Based on optimized compatibility of interaction and simplified techniques, A4WP and PMA signed up the preliminary cooperating agreement to create a win-win situation for the industry.

The collaboration agreement indicates:

– PMA will adopt “Rezence,” A4WP’s technique of magnetic resonance to the transmitter and receiver no matter if they are single mode or multi-modes.

– A4WP will adopt the standards for magnetic induction, simultaneously support multiple modes on magnetic inductive and resonant charging.

– A4WP and PMA aim to manage the whole wireless charging service by co-working on research and development of open network API.

Consequently, A4WP and PMA will share the charging techniques of magnetic induction and magnetic resonance with each other. User scenarios of magnetic resonance applications include long-distance charging, for example, electronic car charging, while magnetic induction can backup portable devices, such as the most common devices or car devices.

                                  CES2-3 CES2-4

None the less, the corporation of two parties may not guarantee uniform techniques and standard specifications. To some extent, the techniques of magnetic induction differentiate from that of magnetic resonance. The frequency issue is the first consideration. A4WP operates on high frequency channel, 6.78 MHz and plans to establish 13.56 MHz multiple frequency. The frequency channel used by PMA is from 200 to 400 kHz. It is obviously difficult to converge the two different frequency channels. Secondly, the principle of magnetic resonance applied by A4WP should work at certain distance; however, the practical and the longest distance is 10 cm which is no significant differentiation from the magnetic induction. The technology still remains to be seen.

The reputation and capability of testing and validation solutions prompted Allion Labs to be invited by A4WP to the plugfest event. Through the event, Allion Labs provided critical issues by exchanging different point of views with A4WP and participating companies. These issues are not only helpful information but potential risks for the developers. Any protection mechanism for safety issues, for instance, extra object detecting, temperature and weight should be taken into consideration. Since A4WP intends to manage power with the combination of the advanced technology of magnetic resonant charging and Bluetooth, it is expected to open a new page in the future. When several portable devices are charging in the same area, the portable devices could connect the transmitter of the charger through Bluetooth. Once one device is full-charged, the transmitter could stop power supply through Bluetooth and distribute power for the other devices. This way could upgrade power management efficiency of TX.

It seems like the right time for A4WP to promote its standards for wireless charging, “Rezence.” As we know, communication protocol issues exist between Rezence and Bluetooth connections. Developers might seek assistances to improve its quality and efficiency from a professional certification lab in the future. Concerning WPC, except for its Europe and America market, WPC has a possibility to win the ticket in Asia due to the favors of Japanese companies. A4WP should be aware of the changeable market. As an expert of wireless charging testing and authorized Bluetooth Qualification Test Facility (BQTF), Allion Labs will keep focusing on the market dynamics and the latest related news.

The New Era of Unlimited Battery Charging Technology: Allion Wired & Wireless Charging Test & Evaluation Report

With the evolution and spread of portable electronic devices such as up-to-date smartphones, Tablet PCs and digital cameras, the high energy usage and charging requirement are predicable and trying to be optimized through all of them. Whether you are using a wired USB interface-based universal charging solution, or adopting the increasing and developing wireless charging and inductive power solution, that allows your device be fully charged with efficiency and lower the power consumption will become the most important and considerable indicator of researching, designing and purchasing the related charging technologies for various kinds of vendors.

Read more

Wireless Charging Powers Up Unlimited Future


Picture: How Nokia Lumia 920 Charges Wirelessly

You may have this experience: when you want to charge your cameras, mobile phones or tablets, you cannot only tell many different kinds of chargers apart but find out that they all tangle with each other. These black dusty chargers look similar and haven’t been changed a lot for a long time, which have become the subordinate role. In recent years, aside from the hardware and software progression of electronic devices itself, manufacturers have noticed the details of accessories thus improved bulky chargers and annoying power supply cords. Finally, users can dispose disorderly devices because the remarkable advance of wireless charging technology does help users to have better product usability and user experience.

Read more