Efficient high voltage pulser for piezoelectric air coupled transducer |
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| Institution: | 1. Xtremax Pte Ltd, Indonesia;2. Department of Electrical and Information Engineering, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul, PO: 01811, South Korea;1. Molecular Imaging Research & Education (MiRe) Laboratory, Department of Electronic Engineering, Sogang University, Seoul, Republic of Korea;2. Sungkyunkwan University, School of Medicine, Seoul, Republic of Korea;1. University François-Rabelais, GREMAN UMR 7347 CNRS, Tours, 37071, France;2. IEMN UMR 8520 CNRS, ISEN department, 59046 Lille, France;3. Thales Research & Technology, Palaiseau, 91767, France;1. Insight Data Science, Fellowship Program, San Francisco, California, 94107, United States;2. University of Minnesota, Mechanical Engineering, 111 Church St SE, Minneapolis, MN 55455, United States;3. Pratt and Whitney, Systems Engineering, 400 Main St., East Hartford, Connecticut, 06118, United States;4. Mechanical and Aerospace Engineering Department, 98 Brett Road, Rutgers, The State University of New Kersey, 08854-8058, United States;5. Biomedical Engineering Department, 599 Taylor Rd., Rutgers, The State University of New Jersey, Piscataway, NJ 08854-8058, United States;6. Department of Educational Psychology, Rutgers, The State University of New Jersey, Piscataway, NJ 08854-8058, United States |
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| Abstract: | The design of high voltage pulser for air coupled ultrasound imaging is presented. It is dedicated for air-coupled ultrasound applications when piezoelectric transducer design is used. Two identical N-channel MOSFETs are used together with 1200 V high and low side driver IC. Simple driving pulses’ delay and skew circuit is used to reduce the cross-conduction. Analysis of switch peak current and channel resistance relation to maximum operation frequency and load capacitance is given. PSPICE simulation was used to analyze the gate driver resistance, gate pulse skew, pulse amplitude influence on energy consumption when loaded by capacitive load. Experimental investigation was verified against simulation and theoretical predictions. For 500 pF capacitance, which is most common for piezoelectric air coupled transducers, pulser consumes 650 μJ at 1 kV pulse and 4 μJ at 50 V. Pulser is capable to produce up to 1 MHz pulse trains with positive 50 V–1 kV pulses with up to 10 A peak output current. When loaded by 200 kHz transducer at 1 kV pulse amplitude rise time is 40 ns and fall time is 32 ns which fully satisfies desired 1 MHz bandwidth. |
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