Smartphones and wearables will accelerate the growth of the wireless charging market. Due to factors such as cost and standard specifications, wireless charging and importing terminal products are not as expected. However, with the release of a new generation of smartphone specifications and the rapid growth of wearable products, wireless charging is expected to catch up with this wave, and the market is expected to accelerate in the future.
The iPhone 7 was launched this year, and the discussion about the iPhone 8 followed. The 10th Anniversary Edition of the iPhone 8 will be designed to innovate and be a part of the community. Among them, the long-rumored, built-in wireless charging function is not the first time, but as Apple gradually simplified the design trend of the hole line, it seems that the iPhone 8 introduces wireless charging function.
Wireless charging is introduced into the mobile phone marketCutting off the power cord of electronic equipment has always been considered a very cool thing, but why is Samsung, the top 10 mobile phone manufacturers, putting wireless charging into high-end mobile phones? The main reasons include:
1. High cost of placement: At present, if you want to join the wireless charging function, the receiving end (RX) in the mobile phone must increase by $3 to $5, and the transmitting end (TX) must increase by $8 to $12, which does cause a lot to the mobile phone industry. pressure.
2. Fever problem: wireless charging because of poor efficiency, the general conversion rate is 70∼75%, the remaining disappeared energy will be converted into heat, and some mobile phones are more susceptible to heat, causing negative consumer evaluation.
3. Alignment problem: The ideal wireless charging should be like Wi-Fi. When the consumer enters this space, it should receive energy; but with the current technology, it needs to be placed on a small plane. And if you are not allowed, you will not be able to charge.
4. Wireless charging can not be used in metal casings: At present, high-end mobile phones still use metal casings as the mainstream. However, due to the characteristics of magnetic induction, metal casings cannot use this function; although magnetic resonance claims to solve this problem, There are currently no mass production products.
5. Patent and royalty issues: Various manufacturers have been applying for patents related to wireless charging in recent years. It seems to be calm and calm, but the bottom is a dark tide. After waiting for the surge in shipments, it will become a chip in hand. At present, WPC announced that RX has no patent and royalty rights, and some IC suppliers, such as NXP/TI, have announced that ICs in shipments have paid royalties to Fulton; AFA is The manufacturer must pay the premium to the planner (eg Qualcomm, WiTricity)
6. Insufficient promotion of the alliance: The alliance relies on the annual membership fee to support the operation. However, it is quite important to pay for the major exhibitions and the basic operating expenses, not to mention spending a lot of money to promote the alliance brand to the end consumers. In addition, the Alliance logo has been seriously spoofed, and there is no special person to deal with it. The market is full of bad or flawed products, resulting in poor consumer experience in wireless charging, which invisibly affects the development of wireless charging.
7. Two camps: It is a good thing to have competition, but the two camps began to attack each other, so that the mobile phone industry has some scruples about the technical doubts raised by the two camps. Under the vicious circle, simply put the wireless charging function from the mobile phone. Pumped out.
Magnetic induction / magnetic resonance is the two mainstream technologies for wireless chargingObjectively speaking, in the past few years, the manufacturers who are waiting for the wireless charging function are actually more than Apple. Many manufacturers have also introduced experimental models for internal evaluation, but due to the above-mentioned points, the lack of uniform standards is considered to be the biggest constraint. At present, there are two technical solutions with relatively high commercial level in the wireless charging market: magnetic induction and magnetic resonance, and thus developed two standard camps.
As the name suggests, magnetic induction technology uses the principle of electromagnetic induction to generate a magnetic field from the AC current in the primary coil and to form an induced current in the adjacent secondary coil through the magnetic field, thereby completing the "space-to-space" transmission of energy. The camp supporting this technology is WPC (Wireless Power ConsorTIum), and the Qi standard launched by WPC has also achieved good commercial promotion results in recent years. Due to the magnetic induction technology, the primary and secondary coils need to be placed as close as possible to each other, and the charging distance is short, so it is also called "tight coupling" wireless charging technology. The advantages of this technology are obvious, including high energy transmission efficiency and simple system. However, since the freedom of placement of the device during charging is limited, and one power supply base can only be charged by one device, flexibility and user experience have always been non-crossing. The threshold of the past.
The technology of magnetic resonance wireless charging is to make the charging end and the receiving end into a resonant circuit with the same vibration frequency. When one circuit is energized and vibrated, the other circuit will resonate and generate current.
Since the two circuits that generate resonance can be farther apart in space, magnetic resonance technology is also defined as a "loosely coupled" wireless charging method. The AirFuel Alliance is a champion of this technology. The industry organization was formed by the merger of two standards organizations in the wireless charging industry, A4WP (Alliance for Wireless Power) and PMA (Power Matters Alliance), in June 2015. It is to continue to promote the Rezence magnetic resonance standard of A4WP.
Compared with magnetic induction technology, the "loosely coupled" magnetic resonance technology has the advantages of long charging distance (up to 50mm vertical distance), can be charged by almost any object, can charge multiple devices at one time, and the surface of the charging device can be metal. The material is obviously more user-friendly. Of course, due to the long distance between the charging coils, the electromagnetic energy will be dissipated more, the efficiency is not dominant, and the application will be limited in the case of electromagnetic interference EMI sensitive, but the most important thing is that the commodity price is magnetic induction 2 ∼ 4 times.
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