Abstract: The feasibility of a new full bridge high intensity focused ultrasound (HIFU) amplifier system with
harmonic cancellation is evaluated in this study. Harmonic cancellation technique is applied to these power
amplifiers, which can eliminate the 3rd harmonic and all even harmonics. Since this technique requires two
channels of phase signal to control one channel of power amplifier, the signal generator is required to double its
output. The transducer array proposed in this study has 100 elements. So we choose an FPGA chip to generate
200 driving signals, and each channel has a phase resolution of 2 ns, less than 1?. The phase signal from the FPGA
meets the requirement of driving the power amplifiers. The output waveform of one channel of power amplifier
(voltage across the transducer) is evaluated, and shows fewer harmonic components.
WU Hao (吴昊), SHEN Guo-feng* (沈国峰), SU Zhi-qiang (苏志强), CHEN Ya-zhu (陈亚珠)
. A New Full Bridge High Intensity Focused Ultrasound Power System with Harmonic Cancellation[J]. Journal of Shanghai Jiaotong University(Science), 2014
, 19(6)
: 698
-701
.
DOI: 10.1007/s12204-014-1568-5
[1] Suzuki T, Mizutani Y, Ikeda H, et al. Impedance characteristic of ultrasonic transducer operated as load of MOSFET DC-to-RF power inverter [C]//22nd International Conference on Industrial Electronics, Control,and Instrumentation. Taipei, China: IEEE, 1996:987-990.
[2] Mizutani Y, Suzuki T, Ishikawa J, et al. Singleended compact MOSFET power inverter with automatic frequency control for maximizing RF output power in megasonic transducer at 3 MHz [C]//1998 IEEE International Symposium on Circuits and Systems.Monterey, USA: IEEE, 1998: 578-581.
[3] Suzuki T, Ikeda H, Yoshida H, et al. Megasonic transducer drive utilizing MOSFET DC-to-RF inverter with output power of 600Wat 1 MHz [J]. IEEE Transactions on Industrial Electronics, 1999, 46(6): 1159-1173.
[4] Hall T, Cain C. A low cost compact 512 channel therapeutic ultrasound system for transcutaneous ultrasound surgery [C]//5th International Symposium on Therapeutic Ultrasound. Boston, USA: AIP Publishing,2006: 445-449.
[5] Tang S C, Clement G T. A harmonic cancellation technique for an ultrasound transducer excited by a switched-mode power converter [J]. IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control,2008, 55(2): 359-367.
[6] Mizutani Y, Suzuki T, Ikeda H, et al. Frequency control of MOSFET full bridge power inverter for maximizing output power to megasonic transducer at 3 MHz [C]//Industry Applications Conference. Saint Louis, USA: IEEE, 1998: 1644-1651.
[7] Ikeda H, Suzuki T, Hayeiwa K, et al. Output power and efficiency tradeoff in full-bridged MOSFET power inverter for use at shortwave frequencies [C]//Industry Applications Society Annual Meeting. Dearborn, USA:IEEE, 1991: 965-970.
[8] Suzuki T, Ikeda H, Mizutani Y, et al. Full-bridged MOSFET DC-to-RF inverter for high frequency ultrasonic transducer at 3 MHz [C]//IEEE International Symposium on Industrial Electronics. Athens, Greece:IEEE, 1995: 232-236.
