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VOLUME -22 NUMBER 6
Publication Date: 06/1/2007
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Versatile Piezo Amplifier for High-Force Actuators from PI
High-voltage piezo driver with several piezo stack actuators.
Auburn, MA — Physik Instrumente L.P. (PI) is introducing its new E-481 high-voltage amplifier for piezoelectric actuators. According to the company, the unit is one of the most powerful and energy efficient power amplifiers currently available for piezo positioning control.
The bipolar driver circuit provides 2000 W of dynamic power and an output voltage range of up to 1100V or ±550V. With source/sink currents to 2000 mA and a bandwidth of 5kHz, the E-481 can achieve very high slew rates, even with large capacitive piezoelectric loads.
Applications include active vibration damping and cancellation, precision machining, non-circular turning of optics, smart structures (adaptronics), high-load precision positioning, laser tuning, high-speed switching.
The driver provides high efficiency through energy recovery design; 2000 W dynamic power; multiple output ranges — 0 to 1100V, -260 to +780V, -550 to +550V, +260 to -780V, 0 to -1100V, unipolar and bipolar operation; differential operation of 2 piezoelectric actuators; 5kHz bandwidth; computer interface and servo module upgrades.
The amplifier can be operated in both inverting and noninverting mode, with a DC gain of ±100. The differential design allows two piezo actuators to be driven in push/pull mode, a plus in dynamic positioning applications where a maximum of force and stroke are required.
The driver was specifically developed for reactive (capacitive) loads presented by large piezoelectric stacks. It is based on a novel design employing energy-recovery technology. Instead of dissipating the reactive power in the heat sinks, it is recovered so that only the active power used by the piezo actuators has to be supplied. During discharge of the actuators, the energy not used is returned and reused to supply the amplifier.
For more information, contact: Physik Instrumente L.P., 16 Albert St., Auburn, MA 01501
508-832-3456 fax: 508-832-0506 E-mail: email@example.com Web:
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