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对用于有源磁悬浮轴承的连续型功率放大器与开关型功率放大器作了简单的比较．给出了采样-保持策略用于开关型功率放大器设计的基本思想．对基于采样-保持策略的开关型功率放大器的动态特性进行了分析，认为采样-保持策略对于提高有源磁悬浮轴承中的电流响应速度是有利的．
A simple comparison of continuous-type power amplifiers and switched-mode power amplifiers for active magnetic bearings is given. The basic idea of the sample-and-hold strategy for switching power amplifier design is given. The dynamic characteristics of switched-mode power amplifier based on sample-and-hold strategy are analyzed. It is considered that the sample-and-hold strategy is beneficial to improve the current response speed in active magnetic bearings.