Loss and thermal evaluation of power converters in wireless power transfer systems

• Main Author: Li, Dongxuan
• Other Authors: Tang Yi
• Format: Thesis-Master by Coursework
• Language: English
• Published: Nanyang Technological University 2023
• Subjects: Engineering::Electrical and electronic engineering::Power electronics
• Online Access: https://hdl.handle.net/10356/166766
• Institution: Nanyang Technological University

Wireless power transfer is a technology that can transmit power without wire connection. With the increase of power demand and people's pursuit of more convenient and safe electrical products, the efficiency and security of wireless power transfer system has been pushed to the public's attention. This paper introduces the loss and thermal evaluation of power converter in wireless power transfer system. Explained from the design and simulation aspects of the system. This paper carries out mathematical modeling for the IPT system in the wireless power transfer system, and establishes a thermal simulation model in PLECS. Select the PSM method on the inverter for modulation to achieve system output regulation. Perform a loss analysis on the system, dividing the losses of the inverter into conduction losses and switching losses, and analyzing their influencing factors separately. The conclusion is that the conduction loss is influenced by the conduction time and conduction resistance. As the phase shift angle increases, the conduction loss continuously decreases, while the switching loss first increases and then decreases. Perform thermal simulation on the overall system to obtain the specific heat dissipation process during system operation. The operating temperature of the system is related to losses and thermal resistance. In actual experiments, various heat dissipation methods are adopted to reduce thermal resistance and ensure the safe operation of the system.