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http://dx.doi.org/10.5370/KIEE.2018.67.3.383

New High-efficiency Power Amplifier System for High-directional Piezoelectric Transducer  

Kim, Jin-Young (Dept. Electrical Engineering, Pukyong Nat. University)
Kim, In-Dong (Dept. Electrical Engineering, Pukyong Nat. University)
Moon, Wonkyu (Dept. Mechanical Engineering, Pohang Univ. of Science and Technology)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.67, no.3, 2018 , pp. 383-390 More about this Journal
Abstract
Piezoelectric micro-machined ultrasonic transducers for highly directional speaker need DC bias voltage. Most existing power amplifiers are not suitable for use in highly directional transducers because they are based on AC. In addition, since the piezoelectric micro-machined ultrasonic transducer has a large capacitive reactance, the power efficiency of the power amplifier is very low. Thus this paper proposes a new high efficiency power amplifier with DC bias voltage. In addition, by designing a matching circuit to compensate the capacitive reactance of the micro-machined ultrasonic transducer, the power efficiency of the power amplifier increases. The operating characteristics of the proposed power amplifier was verified by an experimental prototype. The proposed power amplifier is expected to be widely used in designing and implementing other related power amplifiers.
Keywords
Matching circuit; pMUT; Power amplifier; Private audio communication system;
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Times Cited By KSCI : 1  (Citation Analysis)
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