By Hartmut Janocha (auth.), Professor Dr.-Ing. habil. Hartmut Janocha (eds.)
Authored by way of a staff of stated specialists, this publication provides a multidisciplinary view of the state of the art within the box of actuators. The target of the booklet is to supply a entire review of the homes, purposes, and capability purposes of conventional and unconventional actuators, including their corresponding strength electronics. precise realization is paid to the target overview of competing actuator rules. The e-book is written basically for designers and engineers in examine and improvement, yet may also be invaluable as a textbook for college kids of automation engineering, mechatronics and adaptronics.
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Additional resources for Actuators: Basics and Applications
5. Turn-off behavior of power diode 24 Stefan Butzmann recombination, the storage time ts is virtually reduced to zero. This makes the Schottky diode very suitable for fast switching applications. The disadvantages of Schottky diodes are the relatively large leakage current and the lower breakdown voltage in comparison to pn-diodes. Schottky diodes are available with voltage ratings up to typically 150-200 V. For fast-switching applications with breakdown voltages of more than 200V FRED diodes (fast recovery epitaxial diodes) are a good compromise.
As long as the gate- source voltage is zero, only a small leakage current flows, when a positive drain- source voltage is applied. For a negative drain- source volt age the intrinsic reverse diode conducts, so a reverse current will flow even for Vcs = 0. W hen the gate-source voltage is increased, the transistor shows a quasi-linear relationship between the drain current / 0 and the drain-source voltage V08 as long as the MOSFET remains in the ohmic region. The parasitic bipola r transistor and its base-collector capacitance made early MOSFETs susceptible to turn-on for large gradients of the drain- source voltage Vos- The source-metallization prohibits t his parasitic turn-on by D Fig.
Additional speed-up of the turn-off process can be achieved if a negative supply voltage for the driving circuit is used. By this measure the charge can be removed even faster from the gate capacitance of the power-MOSFET. Overvoltage Protection Overvoltages occur most commonly when the power switch is turned off while the load inductance is carrying a current. As stated previously, the diode starts to conduct only after it has been flooded with minority carriers. Until this happens, the inductive load keeps a constant current and creates an 50 Stefan Butzmann 15V -5V ____c :=:r- I t Vin a b Fig.
Actuators: Basics and Applications by Hartmut Janocha (auth.), Professor Dr.-Ing. habil. Hartmut Janocha (eds.)