Improving Ultrasonic Power Transfer in Air Through Hybrid S-Parameter Modeling and High-Efficiency Compensation.

Area of Science:

• Electrical Engineering
• Acoustics
• Wireless Power Transfer

Background:

• Ultrasonic Power Transfer (UPT) offers advantages over electromagnetic wireless power transfer (WPT).
• Air-based UPT faces challenges with low efficiency due to acoustic energy loss and limited output power.
• Existing models like Butterworth-Van Dyke (BVD) are inadequate for air UPT due to weak coupling and high energy dissipation.

Purpose of the Study:

• To develop an accurate mathematical model for air-based UPT systems.
• To design an effective electrical compensation scheme to enhance UPT performance.
• To improve the efficiency and output power of UPT systems operating in air.

Main Methods:

• Developed a novel hybrid S-parameter model integrating S-parameter theory and two-port network analysis.
• Designed a double-side CL compensation scheme based on the new model.
• Utilized the Smith chart for simplified compensation circuit design.
• Conducted experimental validation of the proposed scheme.

Main Results:

• The proposed hybrid S-parameter model improves accuracy and reduces complexity for air UPT.
• The double-side CL compensation scheme significantly enhances UPT system performance.
• Achieved an efficiency increase to 2.14% and an output power increase to 13.5 mW.
• Demonstrated a practical and effective solution for improving air UPT transmission.

Conclusions:

• The novel hybrid S-parameter model and double-side CL compensation scheme effectively address limitations in air UPT.
• The proposed approach offers a significant improvement in efficiency and output power for air-based wireless power transfer.
• This work provides a practical solution for advancing UPT technology in air environments.