On–Off Keying Multi‐Port Simultaneous Wireless Power and Information Transfer Based on High‐Frequency Carrier Injection

ABSTRACT Multi‐port wireless power transfer (WPT) technology can realize non‐contact power transmission between multiple devices, which is potentially used in the integrated system of PV, energy storage, and charging, cooperative power supply for multiple unmanned aerial vehicles, etc. The simultaneous transmission of power and information between multiple ports is crucial to the intelligence and automation of WPT systems. However, the research on simultaneous wireless power and information transfer (SWPIT) is really limited. In this paper, an on–off keying multi‐port SWPIT methodology based on high‐frequency carrier injection is proposed for magnetically coupled resonant WPT systems with multiple sources and loads. Taking the three‐port system as an example, the system architecture and specific circuit topology of power and information transfer circuits are demonstrated, and the corresponding equivalent circuit models are built to analyze the power transfer characteristic and information transfer gain. Meanwhile, key parameters to achieve the required information transfer gain are designed, and the power and information crosstalk is discussed. A prototype with three ports and the rated power of 400 W is fabricated in the laboratory, and the validity of the proposed methodology is verified by experimental results.