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Why are so many wireless charging standards? Where is Apple Qi and Samsung Qi different? May 08, 2018

The wireless charging standard makes Qi fragmented. Although it also supports the Qi standard specification, there are many private protocol wireless charging standards in the market, such as Apple 7.5W, Xiaomi 7.5W, Huawei 10W, SONY 9W, and Samsung 10W. The self-reliance standards, incompatible with each other, and the increase in the cost of consumer accessories purchases, led to the fragmentation of Qi is not optimistic.

Qi wireless charging specification


WPC is the first industry standard organization for wireless power and is the maker of "Qi" specifications. There are a large number of members worldwide, so far more than 500: including Apple, Samsung, Google, Huawei, Xiaomi, Haier and other internationally renowned companies. Ms. Shuang was the Marketing Director of the IEEE Standards Association. The WPC sets a normative industry standard for 15W low-power applications. The purpose of this standard is to achieve interoperability between various charging boards and portable devices. Products that have been certified by the WPC Consortium will be identified with the words "Qi" and the terminals with "Qi" may be charged on all charging boards marked with the logo. The annual fee for joining WPC ranges from US$5,000 to US$25,000. Only joining the WPC Wireless Charging Alliance can earn Qi certification.

Qi wireless charging specification significance


Qi is a mature open standards specification designed to help consumers use the most advanced technologies. Qi certified products need to pass compatibility and safety tests. Qi's Logo is a symbol of compatibility and safety. Different brands of products, as long as there is a Qi logo, Qi wireless charger can be used to charge. The series test verifies that the charger is compatible with other Qi phones, and at the same time, it can ensure that the product is safe and reliable, and can prevent injuries and prevent equipment damage (heating of coins, damage to mobile phones, damage to NFC cards) and so on.

Wireless charging for mobile phones

According to incomplete statistics, as of April 30, 2018, the number of WPC members has increased to 534. Last September, Apple’s new iPhone was confirmed to carry wireless charging. At that time, there were only 251 WPC members. The number of members now doubled directly, which directly reflected the fiery level of the wireless charging market.

Wireless charging is undoubtedly a hot topic in this year's technology industry. After the Apple iPhone 8/X adopts the wireless charging function, several big players in the Android camp have started to follow suit, and some even have wireless fast charging technology. In fact, many mobile phones have been equipped with wireless charging technology since the commercial use. According to WPC's official website, there are as many as 60 models of the latest Qi-certified mobile phones in the WPC Wireless Charging Alliance.

It can be seen that the latest Qi-approved mobile phones announced by the WPC Wireless Charging Alliance have already reached a considerable scale. With the re-emergence of the wireless charging function, there will be more and more terminal devices supporting wireless charging, and the wireless charging infrastructure in public places will gradually form a scale. A future without charging constraints will soon come.

Qi standard fragmentation, different brands of mobile phones have different standards

Apple 7.5W:

The iPhone 8/X is fully equipped with wireless charging, compatible with 5W charging on the market, and it also carries a private 7.5W wireless charging protocol. The official claims that it can be achieved with the Apple AirPower wireless charger or a third-party authorized wireless charger. 

Millet 7.5W:

The millet conference released the first Xiaolong 845 domestic mobile phone millet MIX 2S, which is equipped with a 7.5W wireless charging. Also released with the mobile phone is the millet wireless charger, which comes with an exclusive version of the mobile phone, which is priced at 99 yuan. It is equipped with Qi standard, and supports the millet MIX 2S wireless fast charge (7.5W). It also supports iPhone 8/X and other devices. Ordinary wireless charging.

Huawei 10W:

The P20 series of new machines launched by the Huawei conference include: Huawei P20, Huawei P20 Pro, and Huawei Mate RS Porsche. Unfortunately, only the Mate RS Porsche version supports wireless charging. The Huawei P20 and P20 Pro do not support it. Huawei Mate RS Porsche Edition is equipped with 10W wireless charging. Yu Chengdong stated at the press conference that the charging speed is 80% faster than Apple iPhone X wireless charging.


Sony XZ2 series finally joined the wireless charging function, of course, also brings a new wireless charger: Sony wireless charging station (WCH20). It supports the Qi wireless charging standard, supports both horizontal and vertical use modes, USB-C input, and 9W wireless charging power.

Samsung 10W:

Samsung can be said to be the only big brand that insists on implementing wireless charging. Up to now, there are as many as 20 models of Samsung handsets equipped with this function. It is expected that the next flagship models will continue to carry this function. . Supporting models include Samsung S6, S6 edge, S6 edge+, S7, S7 edge, Note5, Note6, Note7, S8, S8+, Note8, S9, and S9+, and the wireless charging power is 10W.

Qi standard cannot be unified and the situation is not optimistic

As can be seen from the above table of Qi certified wireless charging mobile phones, the wireless charging power supported by each mobile phone brand is different, such as Apple 7.5W, millet 7.5W, Huawei 10W, SONY 9W, Samsung 10W, etc. The fragmentation is severe. This means that although Qi certified devices have good compatibility and wireless chargers can normally charge mobile devices, they may only support ordinary 5W and cannot achieve fast wireless charging. This will undoubtedly increase consumers' purchasing costs.

In fact, the current status is similar to the previous wired fast-charging industry: various fast-charging protocols stand alone and incompatible with each other, such as QC fast charge, Samsung AFC, Huawei FCP/SCP fast charge, MediaTek MTK fast charge, VOC/Dash flash charge, USB PD fast charge and so on. This leads to the fact that users can only use the original charger to achieve fast charging, adding a lot of trouble. Wired fast charging has just emerged as a sign of the USB PD unified market, and wireless fast charging has begun to embark on its own path. This closed industry phenomenon is clearly not a healthy development trend.