电工技术学报  2019, Vol. 34 Issue (2): 306-315    DOI: 10.19595/j.cnki.1000-6753.tces.171312
电力电子 |
二电平电流型开关功率放大器稳定性分析
余忠磊, 祝长生
浙江大学电气工程学院 杭州 310027
Analysis on the Stability of Two-Level Current Mode Switching Power Amplifiers
Yu Zhonglei, Zhu Changshen
College of Electrical Engineering Zhejiang University Hangzhou 310027 China
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摘要 二电平电流型PWM开关功率放大器广泛应用于电磁轴承系统中。首先给出二电平电流型PWM开关功率放大器的基本原理及线性化模型。然后结合二电平开关功率放大器输出电流的纹波特点,分析纹波对开关功率放大器稳定性的影响,在电流控制电路分别采用分立器件和集成PWM控制芯片情况下,得到保证开关功率放大器控制回路稳定工作的比例电流控制器的临界增益。最后针对分立器件的电流控制电路,提出一种在低增益条件下通过调整载波偏置电压来降低开关功率放大器稳态误差的方法。仿真和实验结果验证了理论分析的正确性。
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余忠磊
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关键词 开关功率放大器电流纹波稳定性稳态误差    
Abstract:Two-level pulse width modulation (PWM) current mode switching power amplifiers have been widely used in active magnetic bearing systems. The basic principle and linearized model of the two-level current mode switching power amplifier are presented in this paper. Considering the characteristic of the output ripple current, the influence of ripple current on the stability of switching power amplifier is analyzed, and the critical gains of the proportional current controller designed with either discrete devices or integrated PWM controller are obtained respectively to ensure controller stability. When the proportional current controller is designed with the discrete devices, a method to decrease the output current steady-state error in the low gains by adjusting the offset voltage of triangular carrier is proposed. Simulation and experimental results agree with the theoretical analyses.
Key wordsSwitching power amplifier    ripple current    stability    steady-state error   
收稿日期: 2017-09-18      出版日期: 2019-01-29
PACS: TM303.3  
基金资助:国家重点研发计划(2018YFB0905500)和国家自然科学基金(11632015、51477155)资助项目
通讯作者: 祝长生 男,1963生,教授,博士生导师,研究方向为电磁轴承、高速电机、高速飞轮储能系统、电机的振动与噪声等。E-mail: zhu_zhang@zju.edu.cn   
作者简介: 余忠磊 男,1992年生,硕士研究生,研究方向为电磁轴承开关功率放大器。E-mail: 825154908@qq.com
引用本文:   
余忠磊, 祝长生. 二电平电流型开关功率放大器稳定性分析[J]. 电工技术学报, 2019, 34(2): 306-315. Yu Zhonglei, Zhu Changshen. Analysis on the Stability of Two-Level Current Mode Switching Power Amplifiers. Transactions of China Electrotechnical Society, 2019, 34(2): 306-315.
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