Energy Efficient High-Voltage Power Amplifier for High-Force / High-Capacitance Piezo Actuators Provides 2000 Watts


PI (Physik Instrumente) L.P. introduces the new highly energy efficient E-481 High-Voltage Amplifier. This unit is one of the most powerful four-quadrant DC high-voltage amplifiers currently available for piezo control.

Based on energy recovery technology, the bipolar driver circuit provides up to 2000 watts of dynamic output power with power consumption similar to a conventional 50 W piezo amplifier. The output voltage range can be set by the user, up to 1100 V or +/-550 V. With source / sink currents to 2000 mA and a bandwidth of 5 kHz, the E-481 can achieve fast response and high slew rates, even with large capacitive piezoelectric loads.

Applications Include:
Active vibration damping and cancellation, smart structures (adaptronics), high-load precision positioning, laser tuning, high-speed switching, precision machining, non-circular turning of optics.

Features & Advantages
--Very efficient through energy recovery design
--Output up to 2000 W dynamic power with power consumption similar to a conventional 50 W piezo amplifier
--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 possible 
--5 kHz Bandwidth
--Computer interface and servo module upgrades

Differential Drive Mode Provides more Flexibility
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.

Innovative Energy Recovery Provides higher Efficiency
The E-481 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.

Upgrades: Computer Interface, Closed-Loop Position Control:
The E-481 high-voltage amplifier can be upgraded with a computer interface and a variety of servo modules for closed-loop piezo operation.

About PI
PI is a leading manufacturer of piezo systems, nanopositioning and precision motion-control equipment for photonics, nanotechnology, semiconductor and life science applications. PI has been developing and manufacturing standard & custom precision products with piezoelectric and electromagnetic drives for 35+ years. The company has been ISO 9001 certified since 1994 and provides innovative, high-quality solutions for OEM and research. PI is present worldwide with eight subsidiaries and total staff of 450+.


• Function - Power amplifier for PICA™ high-voltage PZTs • Output voltage - 0 to 1100 V (default) (Selectable -260 to +780 V, -550 to +550 V, +260 to -780 V, 0 to -1100 V) • Amplifier channels - 1 • Average output power - equivalent to 630 VA reactive power • Peak output power <5 ms - 2000 VA • Average current - >600 mA • Peak current <5 ms - 2000 mA • Amplifier bandwidth, small signal - 5 kHz (660 nF), 1 Hz (3.4 µF) • Amplifier bandwidth, large signal - 1.4 kHz (660 nF), 350 Hz (3.4 µF) • Ripple, noise, 0 to 100 kHz - 150 mVRMS, 2000 mVP-P (100 nF) • Current limitation -Short-circuit-proof • Voltage gain - +100 • Control input voltage - Servo off: ±1/100 of selected output range, Servo on: 0 to 10 V • Input impedance - 100 kW • PZT voltage output socket - LEMO EGG.0B.701.CJL1173 • Control input socket - BNC • PZT temperature sensor - Max 85 °C, high voltage output is automatically deactivated if PZT temperature out of range • DC Offset - 10-turn pot., adds 0 to +10 V to Control IN • Operating voltage - 100-120 or 220-240 VAC, 50-60 Hz (fuse change required) • Operating temperature range - +5 to +50 °C (over 40 °C, max. av. power derated 10%) • Weight - 8.6 kg • Dimensions - 288 x 450 x 158 mm
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