By Hartmut Janocha (auth.), Professor Dr.-Ing. habil. Hartmut Janocha (eds.)
Authored by means of a staff of said specialists, this e-book provides a multidisciplinary view of the cutting-edge within the box of actuators. The target of the e-book is to supply a finished assessment of the homes, functions, and power purposes of conventional and unconventional actuators, including their corresponding strength electronics. particular cognizance is paid to the target overview of competing actuator ideas. The ebook is written basically for designers and engineers in learn and improvement, yet may also be helpful as a textbook for college students of automation engineering, mechatronics and adaptronics.
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Additional resources for Actuators: Basics and Applications
When a constant current is impressed into the diode, the device shows quasi-inductive behavior until the pn-junction has been flooded with carriers (Fig. 4b). This yields a peak voltage during turn-on, which is dependent on the current slope. The turn-off behavior of the diode is shown in Fig. 5. Power pn-diodes show a "memory" effect. If the voltage across a conducting diode is suddenly reversed, the diode acts like a capacitor at first and a current back into the voltage source builds up. Only after the injected minority carriers (holes in then-region) have been swept out by the reverse current or by recombination, the diode regains its blocking capability.
The Ccn capacitor is formed by the overlap capacitance of the gate electrode with the n-drift drain region, the Cns capacitor by the junction capacitance of the body diode. Both capacitances are nonlinear and functions of the drain-source voltage. In datasheets, usually the values Ciss, Coss and Crss are found (see Fig. 15) with the following relations to the depicted capacitances: = Ccs + Ccn Crss = Ccn Coss = Cns +Gen. 6) These capacitances have a strong influence on the switching behavior of the MOSFET.
R-------~r-------~---------, > ...... 5 2 Fig. 35. Transformer-coupled gate drive with decoupling capacitor on primary and secondary winding for varying duty cycles. a Schematic, b simulation results for secondary coil voltage and Vas of power-MOSFET PT 48 Stefan Butzmann primary side of the transformer. In order to damp the resulting LC circuit formed by the decoupling capacitor and the transformer inductance a damping resistor R 1 is often added. For duty cycle ratios, which are near zero or 100%, extreme voltage levels may occur, where the turn-on voltage has decreased so much that the power device will not safely turn-on.
Actuators: Basics and Applications by Hartmut Janocha (auth.), Professor Dr.-Ing. habil. Hartmut Janocha (eds.)