超声波电源的改进频率跟踪方法
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摘要
针对传统超声波电源频率跟踪方法计算周期数多、过渡时间长的缺点,提出了一种基于谐振频率自动识别的改进型超声波电源变步长频率跟踪控制方法。该方法通过2次采样,计算得到负载的谐振频率,进而利用变步长控制对换能器谐振状态进行保持。实验证明,基于该控制方法的系统可以提升频率跟踪速度,减少系统过渡时间,改善动态响应特性,能更好地满足超声电源的性能要求。
In consideration of the drawbacks of the traditional frequency tracking method for ultrasonic power supply, such as too many machine cycles and a long transient time, an improved variable step-size frequency tracking control method based on resonant-frequency automatic identification is proposed in this paper. This method can calculate the resonant frequency of load in two machine cycles, thus keeping the ultrasonic transducer in a resonant state by variable step-size control. Experimental results showed that the system based on this control method can improve the frequency tracking speed, reduce the transient time, and improve the dynamic response characteristics of the system,which met the requirements of ultrasonic power supply.
In consideration of the drawbacks of the traditional frequency tracking method for ultrasonic power supply, such as too many machine cycles and a long transient time, an improved variable step-size frequency tracking control method based on resonant-frequency automatic identification is proposed in this paper. This method can calculate the resonant frequency of load in two machine cycles, thus keeping the ultrasonic transducer in a resonant state by variable step-size control. Experimental results showed that the system based on this control method can improve the frequency tracking speed, reduce the transient time, and improve the dynamic response characteristics of the system,which met the requirements of ultrasonic power supply.
引文
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[2]李继容.导纳圆图在压电式超声波换能器中的研究[J].仪表技术,2007(11):62-64.Li Jirong.Study on admittance circle diagram of piezoelectric ultrasonic wave transducer[J].Instrumentation Technology,2007(11):62-64(in Chinese).
[3]张善理.基于DSP的大功率数字化超声波逆变电源[D].无锡:江南大学,2011.Zhang Shanli.High-power ultrasonic digital inverter power supply based on DSP[D].Wuxi:Jiangnan University,2011(in Chinese).
[4]Khmelev V N,Levin S V,Tsyganok S N,et al.High power ultrasonic oscillatory systems[C].2007 8th International Siberian Russian Workshop and Tutorial on Electron Devices and Materials.Erlagol,Altai,Russia,2007:293-298.
[5]Dong Guanqiang,Song Lei,Yang Zongxiao.Research and application on the frequency automatic tracking of ultrasonic power based on DSP[C].Proceedings of the 2012 International Conference on Advanced Mechatronic Systems.Tokyo,Japan,2012:478-481.
[6]Zhou Wei,Zhang Dongquan.Research and development of ultrasonic frequency dual closed-loop control tracking system based on the STM32 and phase inspection circuit[C].2012 Third International Conference on Digital Manufacturing&Automation.Guilin,China,2012,24(1):638-641.
[7]Li Bingyi,Ding Zhe.Research on the frequency automatic tracking in ultrasonic power supply based on fuzzy-DDS[C].2012 IEEE International Conference on Automation and Logistics.Zheng Zhou,China,2012:448-451.
[8]Ma K H,Chang W C,Lee Y C.A frequency-tracking FP-GA chip for high-power ultraso-und resonator[C].2009 Fourth International Conference on Innovative Computing,Information and Control.Kaohsiung,Taniwan,China,2009:1409-1411.
[9]林伟,杨洁,桑稳姣,等.负载分压式大功率超声波电源频率跟踪研究[J].武汉理工大学学报:信息与管理工程版,2013,35(1):8-10.Lin Wei,Yang Jie,Sang Wenjiao,et al.Frequency tracking for large power ultrasonic supply with load voltageshared mode[J].Journal of WUT:Information&Management Engineering,2013,35(1):8-10(in Chinese).
[10]金晓毅,邬伟扬,孙孝峰.串联谐振电流源高频链正弦波逆变器的工作原理和控制方法[J].电工技术学报,2007,22(4):100-106.Jin Xiaoyi,Wu Weiyang,Sun Xiaofeng.Operational principle and control of series-resonant current-source mode high frequency link sine-wave inverter[J].Transactions of China Electrotechnical Society,2007,22(4):100-106(in Chinese).
[11]黄如海,谢少军.基于比例谐振调节器的逆变器双环控制策略研究[J].电工技术学报,2012,27(2):77-81.Huang Ruhai,Xie Shaojun.Double-loop digital control strategy based on proportional-resonant controller[J].Transactions of China Electrotechnical Society,2012,27(2):77-81(in Chinese).
[12]陈宏志,王旭,刘建昌,等.逆变电源的虚拟结构化设计方法[J].电工技术学报,2013,28(8):157-163.Chen Hongzhi,Wang Xu,Liu Jianchang,et al.Virtual structure design method for inverter power supply[J].Transactions of China Electrotechnical Society,2013,28(8):157-163(in Chinese).
[13]Santos H M,Capelo J L.Trends in ultrasonic-based equipment for analytical sample treatment[J].Talanta,2007,73(5):795-802.
[14]Mason W P.Maximing the probability of achieving a goal in the case of a partially observe drift process:US patent2514080 1945[P].
[15]Rilcy T,Copeland M,Wasniewski T K,Delta-sigma modulation in fractional-N frequency synthesis[J].IEEE Journal of Solid-State Circuits,1993,28(5):553-559.