A Linear 10 kV Power Amplifier for Piezo Actuators

Konferenz: CIPS 2010 - 6th International Conference on Integrated Power Electronics Systems
16.03.2010 - 18.03.2010 in Nuremberg, Germany

Tagungsband: CIPS 2010

Seiten: 5Sprache: EnglischTyp: PDF

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Horn, T.; Melbert, J. (Institute for Electronic Circuits and Measurement, Ruhr-Universität Bochum, Germany)

Linear pulse amplifiers with current mode output are advantageous for driving high voltage capacitive loads like piezoelectric or electrorheological actuators. The new amplifier implements output voltages up to 10 kV with 2 kW peak power and 80 microsec rise time. Low quiescent current of 0.6 mA minimizes static power losses. The structure consists of multiple stacked feedback loops in order to reach high transfer linearity and a symmetrical voltage division among the cascaded output power transistors. The linear approach eliminates the inherent ripple of switched mode power amplifiers and improves rise and fall times by at least one order of magnitude.