磁悬浮推力轴承三电平PWM开关功率放大器设计

Design of Three-Level PWM Switching Power Amplifier for Magnetic Suspension Thrust Bearings

针对线性功率放大器和两电平开关功率放大器的不足,提出了在磁悬浮推力轴承中采用三电平PWM开关功率放大器,并阐述了三电平PWM开关功率放大器的基本工作原理,设计出一种新的三电平PWM开关功率放大器。分析表明,这种功率放大器相对于普通的两电平开关功率放大器具有电流纹波小、功率损耗小和抗电磁干扰能力强等优点,并具有良好的动态响应能力。

Aiming at the shortage of linear power amplifier and two-level PWM switching power amplifier, a kind of three-level PWM switching power amplifier in magnetic suspension thrust bearings was proposed and its basic principle was described. A novel three-level PWM switching power amplifier was designed. The analysis shows that compared with two-level PWM switching power amplifier, the three- level switching power amplifier has characteristics of lower current ripple, less power loss, stronger anti-electromagnetic interference with a good dynamic response.