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A Multicell Linear Power Amplifier for Driving Piezoelectric Loads

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2 Author(s)
Shyr-Long Jeng ; Dept. of Autom. Eng., Ta-Hwa Inst. of Technol., Hsinchu ; Yung-Cheng Tung

A multicell amplifier is developed by connecting floating signal modules in series to drive piezoelectric devices. The amplifier generates a high voltage gain by summing the individual module gains. The bandwidth equals that of a single module. The multicell 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 plusmn 200-V output swing with a corner frequency of around 100 kHz at a driving capacitive load of 0.1 muF. The slew rate is as high as 115 V/mus, and the maximum output current is plusmn2.6 A. The practicality and performance of the presented modular implementation concepts were verified by the close match between the simulated and experimental results.

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:55 ,  Issue: 10 )

Date of Publication:

Oct. 2008

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