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2018 wireless charging technology: MCU or SoC? Mar 21, 2018

In 2017, Apple released the iPhone 8/X, which triggered the entire wireless charging market in an instant. This technology is about to usher in a big leap forward, and the architecture behind it will also usher in a new generation. The current MCU solution cannot meet market demand. The second-generation SoC wireless charging chip is widely viewed by the industry as the most promising solution architecture.

Wireless charging has been born for a long time. Due to the fact that the technology is not mature enough, it is difficult to cultivate a sufficiently wide range of user groups for unsatisfactory user experience. This has led to its tepid market status. The early mobile power was the solution structure of MCU+ power. As the market matured, it gradually became SoC integration. Now SoC has unified the market. At present, wireless charging products in the market are also MCU solutions that are adopted. It is expected that with the re-emergence of wireless charging, it will continue the development path of mobile power, and SoC integration is the mainstream trend of wireless charging.

1, MCU program:

The MCU chip is responsible for the operation of the Qi protocol and the control of the peripheral circuits. The MCUs used in the market are mostly MCUs. Wireless chargers available in the market include single-coiled, dual-coiled, and triple-coiled. The single-coil solution has a low cost and low price, and it has become the mainstream solution for wireless chargers, accounting for more than 90% of the total wireless charger shipments. Currently, the mainstream single coil wireless charger on the market is a MCU+ discrete component solution. It has many components, a large PCB board, and a high natural cost. At the same time, a large number of components and components will also make it difficult to ensure the consistent reliability of the product. There are various types of stock preparation and the production test process is complicated. This is not conducive to the rapid development of products, production and marketing.

2, SoC program:

SoC, based on highly integrated monolithic wireless charging transmitter ICs. The highly integrated single-chip wireless charging transmitter IC must integrate the full-bridge driving circuit, voltage current detection/signal demodulation circuit, LDO and MCU in the existing scheme into a highly integrated monolithic wireless charging transmitter. IC, only based on such IC program can achieve the simplest peripheral circuit, easy to produce. Only this kind of scheme can adapt to the market, and at the same time, it is also the cost-effective scheme that the accessory manufacturer finally chooses. In addition, the SoC has a built-in Q-value detection circuit that is more sensitive to FOD detection and meets the requirements of the EPP.

A comparison of the two shows that, as shown in the above table, it can be seen that the SoC solution has advantages in all aspects. After all, it is a product of technological advancement in productivity. Therefore, just like the already mature mobile power market, the transition from MCU to SoC for wireless charging is an inevitable trend, and outdated MCU solutions will be eliminated. It is predicted that SoC will be the second generation wireless charging solution.

As the world technology user, WST will follow the latest technology in the next generation of wireless charging power bank to bring better products to consumers.