这些充电器内部紧凑的切换power supplies that efficiently converts line AC into a 5 V DC output. The input AC is first converted to high-voltage DC. The DC is chopped at high frequency and fed into a small flyback transformer. The output of the transformer is converted to low-voltage DC, filtered, and provided as the 5 V output through the USB port. A feedback mechanism regulates the chopping frequency to keep the output voltage stable. Name-brand chargers use a specialized control IC to run the charger, while cheaper devices replace the IC with a low-quality feedback circuit.
基于GaN的USB充电器的最新进入者是Innoscience。创科（珠海）科技有限公司成立于2015年12月，位于珠海国家高新区。他们建立了中国第一条8英寸GaN-on-Si功率器件的批量生产线。Innoscience显然提供了广泛的解决方案，包括30V-650V GaN on Si功率器件和5G射频器件。
我们在ROCK RH-PD65W 65 W（20 V，3.25 A）USB-C墙壁充电器中发现了Innoscience INN650D02，该充电器由深圳仁清卓越科技有限公司生产。据介绍，INN650D02是一种650 V GaN增强型功率晶体管，RDSON为200 mW数据表.
图1和图2显示了ROCK RH-PD65W的正面和背面，尺寸为6.0 cm x 6.0 cm x 2.9 cm，不包括插销。它提供的最大功率密度为10.2 W/in3，这比TechInsights最近分析的充电器的平均值略低。RH-PD65W内部的主PCB的顶面如图3所示。INN650D02出现在靠近电路板中间的位置。
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