Large space Wireless Power Transfer System that Meets Human Electromagnetic Safety Limits

This paper presents a wireless power transfer system that allows for the free reception of energy throughout a room while meeting human electromagnetic safety standards. We optimized the working frequency, coil size, and excitation current of the energy transmission coil to reduce the potential harm of electromagnetic fields on the human body. Finally, a prototype of a dual circular energy emission system with a working frequency of 1.53 MHz, a radius of 2 m, and a distance of 2 m was built, and a receiver was tuned and matched. In a space of approximately 25 m³, a single receiver can achieve wireless power transmission of about 40 W, with a transmission efficiency of 30%. This research demonstrates the possibility of humans breaking free from cable constraints in medium and low-power application scenarios, having significant theoretical significance and practical value.