Staircase-Voltage Metal–Oxide–Semiconductor Field-Effect Transistor Driver Circuit for Therapeutic Ultrasound
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概要
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An important component of all ultrasound systems is the high-voltage pulse generator used to excite the transducer. We created a new type of metal–oxide–semiconductor field-effect transistor (MOSFET) switching circuit for therapeutic ultrasound applications, on the basis of the staircase-voltage drive concept. The staircase drive can significantly decrease the harmonics in comparison with the conventional square-wave drive. Since it does not require a resonant circuit to improve the efficiency, the drive frequency can be freely changed and the total size of the drive circuit can be made smaller. Using a diode in series to the drain of each MOSFET, a staircase-voltage driver was created with a relatively simple configuration. The experimental results of operating a prototype driver, as well as the results from circuit simulation, are discussed.
- 2010-07-25
著者
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Umemura Shin-ichiro
Graduate School of Bioengineering, Tohoku University, 6-6 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan
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Yoshizawa Shin
Graduate School of Engineering, Tohoku University, Sendai 980-5879, Japan
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Moro Kosuke
Graduate School of Biomedical Engineering, Tohoku University, Sendai 980-5879, Japan
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Umemura Shin-ichiro
Graduate School of Biomedical Engineering, Tohoku University, Sendai 980-5879, Japan
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