【作者】 臧晓敏；

【导师】 邓智泉；

【作者基本信息】 南京航空航天大学 ， 电力电子与电力传动， 2004， 硕士

【摘要】 高速磁轴承的发展需要高性能、高效率的功率放大器与之配套。开关型功率放大器因其损耗小、效率高、通频带宽等优点，广泛取代了早期低效率的线性功放，成为目前功率放大器研究的重点。 传统的磁轴承开关功放大都采用电流两态调制技术，存在电流纹波大、动态特性受限等缺点。电流三态调制技术很好地克服了上述缺点，实现了开关功放低电流纹波和良好的动态特性的理想结合。本文讨论了开关功放设计的一般原则，分析比较了不同的控制策略。仿真结果验证了电流三态调制技术的优越性能；实验表明本文研制的基于采样-保持策略电流三态调制开关功放具有结构简单、效率高、纹波小、电流动态响应快、频带宽、受负载影响小等优点，能很好地满足高速磁轴承的要求。更多还原

【Abstract】 With the development of high-speed magnetic bearing, the higher requirements of power amplifier are raised including high performance and high efficiency. Switching power amplifier is popularly used because of its virtues of low power losses, high efficiency and high frequency bandwidth.The standard current controlled bi-state PWM switching power amplifier has its intrinsic deficiencies, such as significant harmonic distortion and restriction of the dynamic characteristic, which have serious negative effects on the magnetic bearing system. To overcome these drawbacks, the application of current controlled tri-state PWM technology to the switching power amplifier is proposed, which can provide better dynamic response combined with lower harmonic distortion. This paper describes the general design rules of switching power amplifier and analyses different control strategies. Simulation comparisons verify the superior performance of the tri-state PWM technology. Experimental results indicate that the current-controlled tri-state PWM switching power amplifier based on sample-hold strategy has high frequency bandwidth and fast dynamic response in a wide load range, which can well meet the demands of high-speed magnetic bearing.更多还原