Research on GaN-based Power Devices Applied in Permanent Magnet Synchronous Motor Drive

• Main Authors: Chi Chang, 張繼
• Other Authors: Kung-Yen Lee
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/763w44

碩士 === 國立臺灣大學 === 工程科學及海洋工程學研究所 === 106 === In this paper, wide-bandgap (WBG) gallium nitride (GaN)-based power devices were used to replace the traditional silicon power device to increase the switching speed of the power device and reduce the switching loss and conduction loss of the three-phase inverter. Therefore, we can use gallium nitride (GaN)-based power devices to increase the power conversion efficiency of the permanent magnet synchronous motor control system and improve the heat dissipation of the three-phase inverter. LTspice circuit simulation software were used to analyze the three-phase inverter circuits with traditional silicon power devices and gallium nitride (GaN) power devices. Gallium nitride (GaN) power devices can reduce switch on-time and switch-off time by 90%, and it also reduce the switching loss of 89% in the inverter when the load current is 8(A). By using MATLAB / Simulink, space vector pulse width modulation (SVPWM), vector control, permanent magnet synchronous machine (PMSM) and control system were combined to simulate the system response such as motor speed, voltage and current waveform of permanent magnet synchronous motor control system. We also use micro-control board and gallium nitride (GaN) power module to implement the permanent magnet synchronous motor control system. Verify that wide-bandgap (WBG) gallium nitride (GaN)-based power devices can be applied to the permanent magnet synchronous motor control system. We also compare the different between the GaN and Si motor control system. The GaN motor control system reduce the total power loss of 1440mW and up to 85.27% efficiency when the motor load is 0.2Nm. The GaN inverter also achieve 95.116% efficiency. Finally, the permanent magnet synchronous motor control system with higher switching speed and better power conversion efficiency is built.