Multi-Level Amplifier for Driving Piezoelectric Loads

• Main Authors: Yung-Cheng Tung, 童永成
• Other Authors: 成維華
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/12096996932066824180

博士 === 國立交通大學 === 機械工程系所 === 96 === This study proposes a multi-level amplifier with connecting floating signal modules in series to drive piezoelectric devices. The amplifier generates a high voltage gain by summing the individual module gains. In the first instance this literature introduces the characteristic and various researching methods of driving piezoelectric loadings. Then the feasibility of multi-level amplifier topology will be discussed by simulations and analyses. Multi-level amplifier provides a means of achieving high power, and can divide the total power dissipation among the modules, because each module delivers the same output voltage and current. A prototype circuit that consists of six floating signal modules exhibits precise linear operation over a wide range of input frequencies and capacitive loads. The circuit provides a 400V output swing with a corner frequency of around 100 kHz at a driving capacitive load of 0.1 μF. The slew rate is as high as 115 V/μs and the maximum output current is �b2.6 A.