Apple's iWatch is getting closer and closer. The wireless charging function that was rumored before will definitely be there, but what technology and standard are used is what everyone has been guessing. Many people think that Apple will use the A4WP standard. However, according to Apple's practice, he does not seem to use other technology-led technologies, because even the USB interface on his mobile phone has to be replaced by his own standard. How can I accept wireless charging with other home-driven standards? However, the vibrating wireless charging has more advantages than the electromagnetic induction type, especially in the common use, such as not having to align the coil, it can have a certain distance, and the main one can be charged one-to-many. Therefore, from the characteristics of smart wearable electronic products, the resonant wireless charging method is more suitable. At the IIC show, Chang Xu discussed with experts in the supply chain that Apple is most likely to adopt vibration-vibration technology.
NXP Releases High-Efficiency Active Vibration A4WP Chip at IIC
"Although today's Qi standard is still the mainstream of wireless charging, but in 2016, resonant wireless charging will exceed electromagnetic induction wireless charging. Because the former can achieve loose coupling, one-to-many charging, can make thinner coils, can be used by Bluetooth Communication and many other advantages," Hyung Kim, general manager of NXP's semiconductor intelligent analog product line, said at the recent IIC-China conference. Therefore, they are currently focusing on the vibration of the A4WP technology. He pointed out that the current resonant wireless charging A4WP has three receiving technologies, including passive vibration, half-bridge active vibration and full-bridge active vibration. NXP is focused on the most efficient full-bridge active-mode wireless charging technology. At present, the efficiency at the end can reach 86%, and the charging distance can reach 1 inch. The charging current can reach 1.2A, 5V. "We can make the current minimum A4WP receiving chip 3.4x3.56mm." He said.
Figure title: The full-bridge active-vibration A4WP termination chip has the highest efficiency, and NXP can reach 86%.
However, Hyung Kim said that although NXP is most optimistic about A4WP, but based on the current Qi is still mainstream technology, so they will launch multi-mode A4WP/Qi/PWA wireless charging receiver chip in the fourth quarter of this year.
Taiwan Gaochuang Technology, the proud of wireless charging ferrite
In the wireless charging module, an important material is the ferrite magnetic material under the coil. This important shielding material is not only because it determines the thickness of the module, but also because its cost occupies the wireless charging module. Important proportions. The formulation and production of this material is highly confidential, and the best in the world is the Japanese TDK and Hitachi. However, Taiwan's Gaochuang Technology is also one of the best.
At the IIC site, with the advantages of ferrite magnetic materials, the various ultra-thin and ultra-small wireless charging modules exhibited by Gaochuang Technology attracted many visitors, and I was attracted to the past.
Figure title: The above three are ultra-thin wireless charging modules designed for Bluetooth headsets, smart watches and mobile phones.
The person in charge of the booth said that the Bluetooth headset wireless charging module, the current is 100-200 mAh, the cost is relatively expensive, about 5 dollars, mainly because TI's highly integrated chip is more expensive. Watch wireless charging and mobile wireless charging can share a set of chip solutions, the cost is about 3-4 US dollars. "Now the standard products are 0.6mm thin, which can meet the thickness requirements of electronic products such as mobile watches." He said, "The hair products can also achieve the previous generation of 1.5mm thickness (integral thickness). About 3.5mm."
For future products, the person in charge said that the design of the wireless charging multimode terminal is a difficult point, especially if it is to support the A4WP\Qi\PWA three-mode terminal. "The way to try now is to achieve it by means of fpc. In the middle is a small coil that realizes magnetic induction. The periphery is a large fpc that realizes resonance," he revealed. Previously, they had qi and PMA dual-mode end products with a thickness of only 0.66 mm.
"The PMA standard is also not to be ignored. Its advantage is that there are chain stores like Starbucks McDonald's, so this one may be better and go faster. We noticed that some of China's major mobile phone companies including ZTE Huawei joined last year. The PMA Alliance," he suggested.
Figure title: The evolution of wireless charging origin products, the thickness is greatly reduced. The starting product can already achieve 1.5mm thickness (integral thickness). The previous generation of the product is about 3.5mm.
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