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SA75 data sheet - .PDF file.

CEDRAT TECHNOLOGIES has developed the SA75 switching amplifier range in partnership with G2ELab. The SA75D model is described as the most powerful amplifier on the market for piezo actuators and is designed for applications that demand reactive power (anti-vibration, fast actuation, vibration generation and so on), such as aeronautics, machine tools and large instruments.

The SA75 range has been designed to harness the performance of its piezo actuators (APA and PPA in L and XL) from -20V to 150V under dynamic conditions. It also includes energy-recovery capacities, allowing consumption to be reduced by a factor of 10.

Traditionally, piezoelectric actuators are used at low frequencies for optical positioning systems, but new dynamic actuation requirements have been introduced into fields such as aeronautics (flaps) and machine tools (vibration assistance). When static, actuators may be adequately supplied by a linear amplifier thanks to their low noise and harmonic distortion.

The LA75C linear amplifier is a good example of this, but its main drawback is the power consumed — hence dissipated — which makes it necessary to have a large heatsink for limited power output (maximum 2.4A at 170V peak to peak for the LA75C).

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Key features and benefits

  • An advantage of the SA75X amplifier is the low level of active power taken from the grid with respect to the high reactive power supplied by the piezo load. This has been made possible through the exceptional yield obtained through the SA75X amplifier’s energy-recovery capacities. This opens up opportunities in fields using embedded applications, such as aeronautics.
  • CEDRAT TECHNOLOGIES’ piezo actuators are relatively compact in terms of the mechanical energy that they are able to produce. In order to fully exploit this advantage, it is necessary to miniaturise the drivers, more particularly for embedded applications.
  • The SA75D amplifier is able to produce an average alternating current output of up to 20A at 170V peak to peak. This 20A current can be maintained indefinitely. Compared with the LA75C linear amplifier, this high-intensity amplifier will help to increase piezo-actuator speed and amplitude by up to a factor of 10. It will also help to control the largest piezo stacks (C>100uF) under dynamic conditions of permanent operation.
  • The amplifiers provided by CEDRAT TECHNOLOGIES are designed to switch at very high frequencies (typically 100kHz) and include an optimised-voltage closed loop to ensure that the output voltage waveform is as ordered. These aspects provide a high resolution, which yields a satisfactory signal-to-noise ratio (more than 60dB).
  • The switching power amplifiers are compatible with RK racking products and perform in either a linear continuous state or purely on/off states when applied to piezo actuators with fast actuations. The switching technique allows high current peaks, required by impulse or by high-frequency applications on large piezo actuators.
  • Further benefits of the SA75X amplifier are its range versatility, featuring three versions (SA75A, B and C) that can manage single or multiple channels,and its compatibility with all CEDRAT TECHNOLOGIES electronic (SG, ECS, UC45 and UC65) ranges.

Cedrat Technologies S.A

CEDRAT TECHNOLOGIES offers off the shelf mechatronics products including piezoelectric and magnetic actuators, motors, mechanisms, transducers and sensors with corresponding drivers and controllers. These mechatronics products are used for scientific and industrial applications requiring features such as: micro & nano positioning, generation of vibrations, micro-scanning, fast & precise motion control, active control of vibration, energy harvesting…

CEDRAT TECHNOLOGIES offers off the shelf mechatronics products including piezoelectric and magnetic actuators, motors, mechanisms, transducers and sensors with corresponding drivers and controllers. These mechatronics products are used for scientific and industrial applications requiring features such as: micro & nano positioning, generation of vibrations, micro-scanning, fast & precise motion control, active control of vibration, energy harvesting…

CEDRAT TECHNOLOGIES is recognised as a highly innovative company and has received several awards. The products, projects and training courses offered by the company focus on:
•Smart Actuators: Actuators & motors based on piezoelectric ceramics, electroactive polymers, ultrasonic effects, magnetostrictive alloys, magnetorheological fluids (MRF) & magnetic effects (moving coils, moving iron …) ; Applications : micro nano positioning, damping, vibration generation, acoustic transducers, micro actuators…

•Smart Sensors: Magnetic, magnetoresistive, magnetostrictive, piezoelectric sensors, transformers or generators; Force, Torque, Position, Speed, Acceleration sensors, including contactless sensors & resonant sensors.

•Mechatronic systems: Multi-degree-of-freedom mechanisms (XY stages, tilts); motion control; Active damping of Vibrations; Vibration (Ultrasonic or sonic) assistance to process; Proportional valves; Fast injectors.

•Detection systems: Health monitoring; NDT using magnetic or acoustic effects; Remote detection systems for position, force, torque remote measurements.

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