电磁轴承的PWM功率放大器的研究  

The Research on PWM Power Amplifier for Active Magnetic Bearings

作　　者：李国栋[1] 张庆春[1] 梁迎春[1] 

机构地区：[1]哈尔滨工业大学机电工程学院,哈尔滨150001

出　　处：《机电一体化》2005年第2期33-36,共4页Mechatronics

基　　金：国家自然科学基金资助项目(5880203)。

摘　　要：介绍了一种采用双极全桥式设计并带有电流负反馈的开关型功率放大器,驱动脉宽信号由DSP产生,占空比可在线调节。通过选择合理的线圈参数和PWM信号的调制频率,可以达到减小电流纹波的目的。并选用了集成的开关功率放大器芯片A3952SB,来实现电磁轴承的驱动。In this paper, introduces a switching power amplifier with current negative feedback, the power amplifier structure adopts full bridge dipole design. The PWM driving signals are produced by DSP, the duty - cycle of driving pulse can be modified on - line. The response speed of force increases and the current ripple reduces by choosing the rational parameters of coil and the modulated frequency of PWM. The integrated driving slug A3952SB carries out power amplifier and optocoupler driving slug 6N137 is chosen in order to realize the high-low voltage separation.

关 键 词：开关功率放大器 电流负反馈 脉宽 调制频率 PWM信号 芯片 驱动 小电流 线圈 开关型 

分 类 号：TH133.3[机械工程—机械制造及自动化]