• Title, Summary, Keyword: Utrasonic transducer

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Output power maximizing in ultrasonic transducer driven at 1MHz utilizing auto-tune MOS-FET RF inverter

  • Mizutani, Yoko;Suzuki, Taiju;Ikeda Hiroaki;Yoshida, Hirofumi
    • 제어로봇시스템학회:학술대회논문집
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    • pp.87-90
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    • 1995
  • When the ultrasonic transducer operating at l MHz for use in cleaning semiconductor wafers or other industsrial materials is driven from the MOS-FET DC-to RF inverter, the output power severely depends on the frequency of operation since the quality factor of the transducer is high. In order to tune to the eresonating frequency of the ultrasonic transducer, the drive signal frequency of the MOS-FET power inverter is automatically scananed until the frequency is set at the resonating frequency of the ultrasonic transducer is maximized. The control circuit consists of an output power sensing circuit, a PLL controller, a frequency standard, and other peripheral circuits. The operation was satisfactory when the transducer having an output of 600 W at 1 MHz was used.

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A Study on the Utrasonic Application for the Efficiency Elevation of the Hydrogen Fuel Production - By the Pressure Sensor Gage - (수소 연료 생산의 효율향상을 위한 초음파 응용에 관한 연구 - 압력센서 계기에 의한 -)

  • Song, Min-Guen;Son, Seung-Woo;Ju, Eun-Sun
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.27 no.9
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    • pp.1229-1237
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    • 2003
  • The production of hydrogen fuel depends basically on the water electrolysis. The ultrasonic effects the decrease of the overpotential in a water electrolysis. A study on the overpotential which activates the hydrogen production is the core to elevate the hydrogen production efficiency on the principle. A pressure sensor system by a new idea is developed and applied. Solutions are 4 kinds of KOH concentration such as 0%, 10%, 20%, and 30%. Two frequency bands of the ultrasonic transducer are 28kHz and 2MHz. The directions of ultrasonic forcing are the vertical direction and the horizontal direction. The temperatures are two states, i.e., no constant and constant. Experiments are carried out sequentially in order in three cases of no ultrasonic forcing, ultrasonic forcing, and ultrasonic discontinution. In results, it is clarified that the ultrasonic effects the decrease of overpotential to elevate the efficiency of hydrogen production.