Abstract：A conventional power amplifier of magnetic bearing in hard switching mode brings on higher switching loss and higher harmonic distortion. To overcome these shortcomings, a new parallel resonant DC link three-level switching power amplifier is proposed for magnetic bearing. The auxiliary resonant unit is added into the DC link of the traditional switching power amplifier based on the three-level control method. All switching devices are operated under zero voltage switching (ZVS) or zero current switching (ZCS). The paper analyzes working principles of different modes and deduces the corresponding circuit equations. Simulation and experimental results show that output current has the same small ripples as traditional three-level power amplifier. Switching loss and harmonic distortion can be reduced. The validity and the efficiency of the circuit are verified.
王军, 徐龙祥. 软开关技术在磁悬浮轴承功率放大器中的应用[J]. 电工技术学报, 2009, 24(6): 85-90.
Wang Jun, Xu Longxiang. Application of Power Amplifier for Active Magnetic Bearing Using Soft Switching Technology. Transactions of China Electrotechnical Society, 2009, 24(6): 85-90.
[1] Zhang J, Schulze J O, Barletta N. Synchronous three-level PWM power amplifier for active magnetic bearings[C]. Proceedings of the 5th International Symposium on Magnetic Bearing, Kanazawa, Japan, 1996: 277-282. [2] 曾学明, 徐龙祥, 刘正埙. 电磁轴承三电平PWM功率放大器研究[J]. 电力电子技术, 2002, 36(3): 13-15. [3] 臧晓敏, 王晓琳, 仇志坚, 等. 磁轴承开关功放中电流三态调制技术的研究[J]. 中国电机工程学报, 2004, 24(9): 167-172. [4] Zhang Jing. Power amplifier for magnetic bearings[D]. Switzerland: Swiss Federal Institute of Technology, 1995. [5] 张丹红, 董瑞, 刘开培, 等. 一种应用于主动磁轴承控制的三态功放设计[J]. 电力电子技术, 2006, 40(3): 112-114. [6] 李冰, 邓智泉, 严仰光. 磁轴承三态开关功率放大器的电流控制模式[J]. 电力电子技术, 2003, 37(4): 52-55. [7] 张亮, 房建成. 电磁轴承脉宽调制型开关功放的实现及电流纹波分析[J]. 电工技术学报, 2007, 22(3): 13-20. [8] Jafar J J, Fernandes B G. A novel quasi-resonant DC- link PWM inverter[C]. 1998 International Conference on Power Electronic Drives and Energy Systems for Industrial, 1998, 2: 839-844. [9] Mezaroba M, Martins D C, Barbi I. A ZVS PWM three-phase inverter with active clamping technique using only a single auxiliary switch[C]. 2003 IEEE International Symposium on Industrial Electronics, 2003, 1: 521-526. [10] Behera S, Das S P, Doradla S R. Quasi-resonant soft-switching inverter for low and high power factor loads[J]. IEE Proceedings-Electric Power Applications, 2004, 151(4): 451-459. [11] Attaianese C, Tomasso G. A new quasi-resonant DC link topology for soft switching of voltage-source inverter[C]. IEEE 34th Annual Power Electronics Specialist Conference, Acapulco, Mexico, 2003, 2: 525-530. [12] Shukla J, Fernandes B G. Quasi-resonant DC-link soft-switching PWM inverter with active feedback clamp circuit for motor drive application[J]. IEEE Proceedings of Electric Power Applications, 2006, 153(1): 75-82. [13] InHwan Oh. The zero-voltage-switching parallel- resonant DC link inverter with minimized conduction loss[C]. IEEE 35th Annual Power Electronics Specialists Conference, Aachen, Germany, 2004, 3: 1718-1723. [14] 明正峰, 钟彦儒, 宁耀斌, 等. 一种新的直流母线并联谐振零电压过渡三相PWM电压源逆变器[J]. 电工技术学报, 2001, 16(6): 31-35. [15] 陈国呈, 孙承波, 张凌岚. 一种新颖的零电压开关谐振直流环节逆变器的电路分析[J]. 电工技术学报, 2001, 16(4): 50-55.
2009, Vol. 24 
