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  • Deep Digging: Black Technology Behind The Black Technology
    Sep 25, 2017

    At present, there are two kinds of wireless charging standards on the market: electromagnetic induction and magnetic resonance. 

    Electromagnetic induction wireless charging

    The Wireless Charging Alliance's Qi standard and electromagnetic induction AirFuel support both single-coil and multi-coil topologies with oscillations between 100 and 300 kHz, which is the main solution on the market today. They are widely used thanks to their excellent price / performance ratio. Magnetic induction always relies on in-band communication.

    Magnetic resonance wireless charging

    AirFuel also offers a resonant technology that operates at 6.78MHz. The advantage is better user friendliness because you can freely place the mobile device near the transmitter (typically up to 30 mm vertical height) and can charge multiple devices of different sizes and power at the same time. AirFuel Resonance uses low power Bluetooth communication.

    Wireless charging applications face many challenges

    Today, engineers are looking for suitable semiconductor solutions to overcome the common challenges in wireless charging applications. First, engineers need efficient and easy-to-design transmitter solutions. Intelligent thermal management is essential, it can keep the surface and emitter of the device at the right temperature and avoid heating the charged battery. Miniaturization is particularly important, especially for small equipment, such as wearable equipment, through the high charging power, can ensure faster charging speed, but also better meet the needs of consumers.