“ELEXCON2017 Shenzhen International Electronics Show started special “Wireless Charging Zone†this year, and invited domestic and foreign mainstream technology providers and new technology companies to participate. From now on, ELEXCON2017 will continue to track reports on wireless charging and market hotspots, so stay tuned! â€
The main advantage of wireless charging is that it can be conveniently placed on a charger or desktop and can be charged without a messy cable. This may not sound like anything, but once consumers experience wireless charging, they will never want to return to the era of inconvenience caused by plugging and unplugging cables.
With the increase and popularity of charging devices in homes, offices, cars, hotels and entertainment venues, users no longer have to worry about batteries, and the number of users will continue to grow. This, in turn, extends the life of the battery. In addition, wireless charging brings other benefits, such as reduced connector wear, improved reliability, and enhanced system waterproof and dustproof performance.
Mobile phones with wireless charging capabilities
Wireless charging has been seen by Samsung's mobile phone manufacturers as a big selling point beyond Apple, but it seems that the current wireless charging function is not just needed and standard. Although it seems that the wireless charging market is progressing slowly, in fact, after several years of development, wireless charging is in a stage of rapid development. Some people in the industry expect that by the end of 2017, more than half of the world's smartphones will be equipped with wireless charging capabilities, and wireless charging will become the industry standard in 2020. According to research firm IHS, in 2016, more than 25 smartphones, 20 smart watches, 200 charging boards, 150 smartphone cases and 50 models have been wirelessly charged. Therefore, the author believes that the current stage of wireless power technology has crossed the initial application technology gap, and it is expected that the penetration rate will continue to grow in the near future.
Starting this year, iphone8 will be equipped with wireless charging news began to spread more and more true, there are rumors that Apple will use Broadcom wireless charging module. "We don't have a good time to evaluate Apple's business. I can only say that Apple has indeed joined the WPC Alliance," said Meno Treffers, chairman of the WPC Wireless Charging Alliance. He also said that there will be 325 million wireless charging products in 2017, of which 300 million are mobile phones. There will be 75 million wireless mobile phone charging devices at the same time. By 2020, wireless charging mobile phones will reach 1 billion units, and in 2025, they will reach 2 billion units. In 2021, charging equipment will reach the order of 500 million units. All household charging equipment can support the qi standard. According to statistics, more than 400 kinds of charging products have been launched. The current market scale is 60-80 million per year, and the potential market reaches 500 million. Among them, car wireless charging is another big market, and there are already 66 cars supporting qi wireless charging.
Recently, Apple, one of the highest-level members of the WPC Alliance, also participated in the WPC Global Wireless Charging Alliance Conference held in Shenzhen. In a sense, the information that iphone8 has joined wireless charging has been proved. Domestic mobile phone manufacturers including Huawei, OPPO, VIVO, Gionee, Nubia, Meizu, TCL have shown strong interest in wireless charging.
Since this year's mobile phone adopts full screen + optical fingerprint recognition + 3D curved glass has gradually become a trend, wireless charging technology will well meet the needs of comprehensive screen mobile phone for design and signal shielding. In addition, with the increasing demand for mobile phone power consumption in the future 5G communication technology, mobile phone life will become a big problem. At present, the concept of so-called "shared charging treasure" in the industry attempts to solve the problem of mobile phone life from the perspective of sharing economy, and obviously the shared business model based on wireless charging will have more value and prospects.
For the mobile phone industry, Apple still has the role of technical wind vane, so Apple's adoption of wireless charging technology will have a huge impact on the entire mobile phone industry, including various Chinese mobile phone brands. With Apple's next-generation mobile phone with wireless charging, there will be more public facilities to lay wireless charging docks. The Chinese market has unparalleled developmental genes, such as the Internet, the sharing economy model, the capital operation model, and even surpassing foreign markets. There are many application scenarios, the consumer base is large, and the explosiveness is stronger. Of course, it is expected that domestic mobile phone manufacturers will follow up with wireless charging in the design cycle for one year to one and a half years, design, trial production, and verification. Overall, the time of the wireless charging of mobile phones will appear at the end of 2017 to 2018.
The standard dispute, the main technical difficulties affecting the wireless charging user experience?Affecting the popularity of wireless charging In addition to the lack of companies such as Apple to market cultivation, an important reason is that there are still some differences in technology, resulting in user experience problems. Samsung has adopted wireless charging since the Galaxy 5, and the reason why it has not been able to drive the market is that the first generation of wireless charging technology is still not perfect, point-to-point charging, and the user experience is poor.
There are three main indicators for evaluating the experience of a wireless charging product: efficiency, freedom, and reliability. Efficiency means faster charging and higher energy transfer; freedom, consumer experience with wireless charging fields, and ever-increasing scenes, which are important for coil design; reliability, such as foreign object detection, metal exposure to magnetic fields, It will cause fever.
Two wireless charging standards battle
Those who are familiar with wireless charging technology know that the two mainstream wireless charging technologies are: magnetic resonance (Qi) and magnetic induction technology (A4WP). Subsequently, the two major standards of ARWP and PMA were announced, and the alliance was renamed AirFuel Alliance (AirFuel). At medium and high power, there is still no very stable application scenario, and the market is still unclear; in the small and medium power market below 15W, with the addition of Apple's WPC wireless charging alliance at the beginning of the year, Apple's wireless charging mobile phone will also be compatible with the Qi standard. Qi is expected to become the mainstream industry standard.
The most popular wireless charging technology on the market today is magnetic induction, and most of the products are compatible with the WPC (Qi) standard. The highly efficient and cost-effective solution makes Qi a clear winner in the application field. In contrast, magnetic resonance does have a greater advantage in terms of space and placement freedom, but is still hindered by poor efficiency, EMI and higher transmitter costs. Therefore, compared to magnetic induction, the infrastructure deployed by magnetic resonance has been significantly less.
From the first generation to the third generation wireless charging chip
As the future technology route is still not particularly clear, currently major wireless charging chip manufacturers tend to adopt multi-mode products to meet all standards. Pan Siming, CEO of Yi Chong Wireless, said that the first generation of wireless charging is dominated by single-mode qi, which has been popular in the accessory market for a long time; the second-generation wireless charging has improved, and the dual-mode only supports the peer-to-peer mode, but There is a limit to the degree of freedom in charging; the third generation of wireless charging chips will increase the degree of freedom experience to a greater extent. The easy-to-charge wireless chip architecture rectifier bridge consists of a low Rdson N-FEF that can operate at high frequencies. The regulator is buck, which can flexibly control external circuits and externally connect BLE modules. The degree of freedom of charging will be greatly improved. In addition, the cost of the third-generation wireless charging chip can be lower. For example, in the past, 80 coils were needed, and today only 10 coils are needed to achieve the same effect, and the cost can be less than 100 yuan.
In addition, as the functions of mobile phones become more and more, the battery capacity is getting larger and larger, and the motherboard of the mobile phone is getting smaller and smaller. The wireless charging circuit must be integrated into the mobile phone motherboard PCB while not changing the internal structure of the existing mobile phone. It poses a challenge to the design. At this time, it is necessary to reduce the thickness of the entire coil module through various research and development from powder, basic raw materials to coil flat wires. The MQPRF flat coil developed by Yi Chong Wireless and Sunlord Electronics reduces the thickness occupied by the substrate under the same power, and the enameled wire film is thinner than the FPC coil cover film, and the transmission efficiency of the coil is higher, which can be 0.23mm. The thickness is much smaller than the 0.3mm of the same, and it can provide customized requirements and has good thermal management performance. There is room for further decline in this value in the future, and it is reported that it can be lowered to 0.2 mm. This is very helpful for the introduction of wireless charging modules for smart phones that are getting thinner and thinner.
Whether it is wired charging or wireless charging, the mobile phone will heat up during the charging process. When the high-power fast charging, the mobile phone heats up even more. Therefore, the mobile phone must have excellent thermal management during the wireless charging process. At present, most thermal management implementations are that when the IC reaches the over-temperature protection point, it will stop working. After the IC temperature drops to the safe working temperature, it will work again. This will greatly extend the charging time and reduce the user experience.
In addition, to do wireless charging without affecting other functions of the mobile phone, it is also necessary to coexist wireless charging with other modules of the mobile phone. If the mobile phone is in the process of wireless charging, the user also watches the movie on the mobile phone at the same time, the user certainly does not want to see that the wireless charging will affect the LCD screen (stripes or screen touch failure); for example, the mobile phone is free of charge while charging wirelessly. To make a call, the voice that the user definitely does not want to hear is intermittent. In order to prevent the above situation, not only the excellent wireless charging circuit design is needed, but also excellent mobile phone structure design, coil design, electromagnetic compatibility design and reliability test.
Shared charging? A new application scenario for wireless charging in the future?Currently, the main wireless charging application is the charging of mobile phones and smart watches. The author believes that the future application space of wireless charging will be very large. For example, the shared charging mode is that the smart phone can be used as a two-way power source in addition to being able to be wirelessly charged. This novel concept allows smartphone users to "borrow" some power from their phones to charge their smart watches or accessories. Therefore, the future wireless charging will support mobile phones and mobile phones only to charge each other.
In addition, the automotive market offers the ideal combination of other wireless technologies and provides users with a complete wireless experience. Imagine entering your car: Put your phone on the charging pad between the driver and the passenger seat. The phone begins to charge using Qi wireless charging and allows the car to recognize the user. The seat position and mirror are adjusted to your preset preferences. Then the phone is connected via wifi (or other) to start playing your favorite music, load your contact list, and navigate to your next destination. This is a complete wireless experience that combines wireless power transmission with wireless data transmission.
In the future, we will see the growth of wireless charging and transmitting devices in homes, offices (usually embedded in furniture or electronic devices), cars, restaurants and public places, and public transportation. From the perspective of wireless charging technology itself, it will become a trend to further increase transmission power, shorten charging time, and reduce transmission temperature and higher degrees of freedom in the future.
About ELEXCON2017 Shenzhen International Electronics Show and Embedded Systems Exhibition: As the largest professional electronics and embedded technology exhibition in South China, ELEXCON2017 will be held at the Shenzhen Convention and Exhibition Center on December 21-23, 2017. From components to systems, from design to manufacturing, ELEXCON2017 brings together the latest technologies and products from more than 800 major suppliers, covering: embedded, Internet of Things, power electronics, human-computer interaction and biometrics, wireless charging, Medical electronics, sensors, electric vehicles, smart manufacturing, etc. For more details, please visit:
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