Browsing by Author "Tung, Yung-Cheng"

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A Multicell Linear Power Amplifier for Driving Piezoelectric Loads
(2008-10-01)
Jeng, Shyr-Long
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Tung, Yung-Cheng
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機械工程學系
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Department of Mechanical Engineering
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 200-V output swing with a corner frequency of around 100 kHz at a driving capacitive load of 0.1 mu F. The slew rate is as high as 115 V/mu s, and the maximum output current is +/- 2.6 A. The practicality and performance of the presented modular implementation concepts were verified by the close match between the simulated and experimental results.
Multi-Level Balanced Isolated Floating Difference Amplifier
(2008-11-01)
Tung, Yung-Cheng
;
Jeng, Shyr-Long
;
Chieng, Wei-Hua
;
機械工程學系
;
Department of Mechanical Engineering
An innovative amplifier is proposed for applications involving high capacitive load and large voltage output swing, such as piezoelectric (PZT) actuator drivers. This amplifier is configured in a multi-level arrangement with floating amplifiers, yielding a high voltage gain as a sum of all individual gains from its operational amplifiers. The merits of such an amplifier also include a wide bandwidth and high potential power. Experiments using a six-level arrangement demonstrate a 100 kHz bandwidth with +/-200 V output swing for different capacitive loadings.