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针对设备到设备无线快速充电中低输入电压和大等效串联电阻(ESR)耦合线圈导致的功率和效率限制，提出了一种差分混合Class-ED功率放大器，实现了27W最大输出功率和82%的峰值端到端效率。
Portable power banks with wireless charging are popular on the market, targeting a wireless charging to-go experience. However, the low input voltage from the battery and the large equivalent series resistance (ESR) of the coupling coils limit the charging power and efficiency of device-to-device (D2D) wireless charging, making it difficult to achieve high power and high efficiency simultaneously [1]. The winding loss of the coupling coils is one major power loss due to the large ESR of hundreds of mΩ [1–4]. Moreover, thicker winding wire or multi-strand Litz wire at 6.78MHz cannot effectively reduce the ESR due to the skin and proximity effects. Therefore, we should limit the AC current through the coupling coils for thermal performance. Consequently, the current wireless charging togo suffers from thermal issues, slow charging speed, and discounted energy-sharing percentage. Class-D and Class-E power amplifiers (PAs) are typical solutions for the wireless power
Fangyu Mao, Rui Martins, Yan Lu
University of Macau, Macau, China