By Hartmut Janocha (auth.), Professor Dr.-Ing. habil. Hartmut Janocha (eds.)
Authored by means of a workforce of stated specialists, this publication offers a multidisciplinary view of the cutting-edge within the box of actuators. The target of the publication is to supply a accomplished review of the homes, purposes, and capability purposes of conventional and unconventional actuators, including their corresponding energy electronics. detailed recognition is paid to the target overview of competing actuator rules. The publication is written basically for designers and engineers in examine and improvement, yet can also be useful as a textbook for college kids of automation engineering, mechatronics and adaptronics.
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Additional info for Actuators: Basics and Applications
IGBTs are generally used in applications where the onresistance of MOSFETs becomes impractically high. The main difference between a MOSFET and an IGBT is the additional p-layer at the drain contact which injects minority carriers into the n-zone and thus improves the conductivity of the device. 17a shows the non-punch-through (NPT) structure of an IGBT, which consists of an n+pn - p+ -sandwich. With this structure, the breakdown voltage of the device is determined by the doping and the thickness of then- -layer, where the electric field can spread.
Usually the input base current JB will be chosen higher than necessary in order to ensure saturation of the transistor. In consequence the collector-emitter voltage will be reduced to VcE,sat, thus resulting in the power consumption P =VcE,sat · Ic+VBE · IB of the device. During the saturation mode with a forward biased base-collector diode there will be an excess of charge in the base, which has to be extracted during switch-off. ·······························~----------- - 5 oL----~10---~2~0---~30 t!
VcEo describes the collector-emitter breakthrough voltage with the base open, VcBo the collector-base breakthrough voltage. A good approximation for the relationship between VcEo and VcBo is given by: VcEo VcBo ;:::j VB. 7a shows a bipolar power transistor used as a switch. Usually the input base current JB will be chosen higher than necessary in order to ensure saturation of the transistor. In consequence the collector-emitter voltage will be reduced to VcE,sat, thus resulting in the power consumption P =VcE,sat · Ic+VBE · IB of the device.
Actuators: Basics and Applications by Hartmut Janocha (auth.), Professor Dr.-Ing. habil. Hartmut Janocha (eds.)