DCP, DCE, VM power operational amplifiers: What makes these controllable power supply units so versatile in function?


 
Thanks to the following properties our linear amplifiers can be used for a wide variety of tasks in machine tools, specialist machinery, precision applications, and testing and research equipment:

Small input bias currents
  typically 1.0nA
Very high open loop amplification
  better than 50,000,000V/V
Offset adjust range
  smaller than +- 1.0mV
High power band power bandwidth
  typically 25kHz, up to 200 kHz
High slew rate
  typically 5V/µs, up to 40V/µs
Very high input impedance
  typically 100MΩ (differential)
High degree of common mode rejection ratio
  typically 135dB at 10Hz
Excellent linearity
 

Working flexibly with plug-in programming printed circuit boards – as a rule custom-made wiring circuits work after a few simple steps:



Why so simple? Because units are extremely stable and have only a limited tendency to oscillate. This is not that common, but it is with SERVOWATT.

Analogue calculations with wiring circuits:

Carrying out mathematical operations – with a high degree of precision, i.e. up to 4 different input signals, directly at the amplifier input, is only possible thanks to our high-quality difference input stage.

The circuits are made in a similar way to IC operational amplifiers, only here you enjoy the benefit of higher voltages, faster slew rates and larger output currents.
Wired programming PC board

Add
Subtract
Integrate
Differentiate
 
The high-quality difference input stage: the heart of the entire system

All important properties offered by the amplifier are determined primarily at the core of the system, e.g. DC accuracy, speed and stability. We have more than 30 years experience developing these small circuits and are thus in a position to provide custom-made control modules configured specifically to your particular area of application.
 
 

 
Continuous short circuit operation
and also 2 to 6-fold peak currents for accelerating high-speed linear and rotative DC servo motors – all possible thanks to over-dimensional output stages. For example, the DCP260/30 with 250W nominal output which has transistors for a total of 2000W power dissipation in the output stage.

Zero Ohms impedance at output
On account of their high stability and internal amplification, these amplifiers can drive low-resistance and capacitive loads without spurious oscillation.
 
Speed control ranges of 30,000:1
are normally handled in practice by these linear DC servo drives. Highly precise and simultaneously fast positionings can thus be realised. Accelerations over 100G with extreme rigidity are also possible for linear actuators.

Broadband and phase shift-free electronics with adaptable frequency response
Linear amplifiers can optimise the response of the DC motor to such an extent that a clean, aperiodic and fast transient response with optimum damping results.
 


Der kürzeste Weg zwischen Mechanik und Elektronik...


Linearverstärker mit Impedanz Null Ohm am Ausgang eignen sich besonders zum Antreiben von Moving-Coil DC-Motoren und Tauchspulen DC-Aktuatoren mit eisenfreien Spulen, die eine sehr niedrige Induktivität besitzen. Die Stromanstiegsgeschwindigkeit und damit die erzeugte Kraft oder das Drehmoment ist extrem schnell: Die wichtigste Voraussetzung für hochdynamische Servosysteme.

Low inertia moving
coil DC motor
55NM81-120-1
Moving coil linear actuator

Acceleration diagram of the 55NM81-120-1 motor: free of overshoot from 0 to 2000 rmp in 2.7ms.


Dynamic peak current: In this test, the current briefly reaches 40A during acceleration. So the resulting angular acceleration is 77.780 rad/s2.

Threshold: The maximum allowable current is 60A. At this current the motor would accelerate at a rate of 115.000 rad/s2.

Transient times in terms of milliseconds

Our control procedure provides the most accurate guidance, the best possible damping and the greatest degree of stiffness against torque disturbance.

 
Discreet output stages · What makes them so uniquely reliable?



Linear power output stages work with paired transistors running in parallel. We expect ultimate performance and reliability from our components, reflected in:

Our choice of power transistors
Input testing is not carried out at random: we test 100%
Selection and identification of the transistor parameters
Pairing of the power transistors for an equal distribution of current in the output stages

 
 

Output oscillogram free from interference
DCP130F40 unit

Frequency 55kHz
Slew rate +-20V/µs
Output +-30V/4A
Active load 7.5 Ohms
Settling occurs aperiodically.
 

These linear power output stages work completely free of any interference

The output voltage thus contains no foreign signal components, pulse needles, harmonics and noise.
   
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SERVOWATT Leistungselektronik GmbH, 70839 Gerlingen near Stuttgart / Germany
Phone +49 (0) 7156 - 24041, Fax +49 (0) 7156 - 29944, Email info [at] servowatt.de