power electronics and devices vol _9_ by iinventers


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									        Institute for Electrical Drives,
           Power Electronics and

                Prof. Dr.-Ing. Bernd Orlik
             Prof. Dr. phil. nat. Dieter Silber

 University of Bremen
Department 1, Physics and Electrical Engineering
                                                                    Institute for Electrical Drives,
                                                                  Power Electronics and Devices
The workgroups of the IALB:
            Electrical Drive Engineering                        Prof. Dr.-Ing. Bernd Orlik
            Electrical Power Devices                            Prof. Dr. phil. nat. Dieter Silber
 Modern electrical drive and
energy techniques are in-
creasingly dominated by the
combination of electrical drives,
power electronics and control.
This comprehensive system
approach is the most important
part of mechatronics. It is the
premise for the development of
new electrical drives with better
dynamics, precision and power
density. They are required in
trains, electrical cars, ma-
chines, plants and medical
devices. Because an industrial
nation uses more than half of
its electrical energy to trans-
form it into mechanical energy
by electrical drives, the impor-
tance of this field of research is
Power electronics and the
automatic control are important
in decentralised generation of
electric power by innovative
wind power plants, photovoltaic
or in the use of fuel cells in future.   Profile of the IALB                    • Electromagnetic      compatibility
By looking at the constant                                                        (EMC)
                                         The wide range of technical re-        • Power electronics
decreasing of our global resources       quirements is interdisciplinary re-
and the dedicated goal to reduce                                                • Control of electrical drives and
                                         searched in the two groups of the        drive systems
CO2-emission sustainably, the best       department. Their fields of research
power efficiency needs to be                                                    • Motion control
developed in energy plants and                                                  • Power components
                                         • System integration of electrical
electrical drives.                                                              • „Smart Power“
                                                                                • Integrated power electronic
                                         • Perturbation in the mains
                                                                                • Photovoltaic
                                                                     Institute for Electrical Drives,
                                                                   Power Electronics and Devices
                                        • Basics in electrical engineering        Career outlook
Equipment                                    and electrical drives III            The education is very application-
The department has many powerful        • Semi-conductors                         oriented, so the postgraduate engi-
computers. The used simulation          • Materials, components and               neers have very good job opportuni-
tools are constantly updated to              circuits I and II                    ties not only in the emphasised fields
always be in the latest state of the    • Opto-electronics                        of research of the IALB. Their uni-
art. For the analysis of devices,       • Power electronics and electric          versal knowledge and competence
finite-element methods (FEM) with            power converters I and II            is also advantageous for other
simulators like Dessis, Medici and      • Drive control and mechatronics I        branches of the electrical engineer-
Tesca are used. In collaboration with        and II                               ing industries involved in analog
the Department of Theoretical           The important meaning of experi-          circuit engineering, simulation tech-
Electrical     Engineering       and    mental work is taught in lab lessons:     niques or real-time signal processing
Microelectronics (ITEM), the devel-
                                        • Basic lab of electrical engineer-       for example.
opment software „Smart Power“ is
also available. Several different
                                        • Basic lab of automatic control          Cooperation
magnetic field simulators and soft-
                                             engineering (5th semester)           In several research projects, the
ware tools are applicable for the
                                        • Lab of electrical drives and            IALB is working in cooperation with
analysis of technical and thermo-
                                             electric power converters (8th       industrial companies and other
mechanical problems in set-up and
                                             semester)                            research organizations in Germany
connection set-up techniques. For
                                        In the lab of electrical drives and       and abroad. Also new technologies
circuit and system simulation, pro-
                                        power converters, students learn to       are transferred in bilateral projects
grams like PSpice, Eldo, Saber, and
                                        deal with all kinds of electrical         with business concerns to the in-
Matlab-Simulink are used.
                                        machine-drives and required sub-          dustrial enterprise.
For experimental surveys and prac-
                                        systems. The experiments are about
tical tests, new techniques and
                                        micro controllers, circuits of electric
methods are used. The department
                                        power converters, hard- and soft-
is equipped with a modern drive lab
                                        ware as well as automatic control of
with computer controlled test stands
                                        electrical drives and drive systems.
and the newest measuring equip-
                                        The theory is deepened in student
ment. For hard- and software-
                                        research projects and diploma the-
development of micro controllers,
                                        sis. More theoretical or more practi-
powerful tools exist. Even more
                                        cal topics can be chosen individually
measuring equipment is available for
                                        form several fields of studies like
the characterization of power com-
                                        power components, power electron-
ponents and solar cells.
                                        ics, micro electronics, hard- and
Teaching                                software and drive control. These
The teaching is directly involved in    fields are directly integrated in the
the application-oriented research       current development and research
and engineering.                        activity of the department.
The following courses are taught:
                                                                    Institute for Electrical Drives,
                                                                  Power Electronics and Devices
        Prof. Dr.-Ing.                 SPS/IPC/DRIVES, which is a con-          Intelligent electric power
                                       gress for application-oriented drive     converters
        Bernd Orlik                    engineering and automation engi-
                                       neering.                                 In this field of research the IALB is
                                                                                working on a new type of energy
                                       Fields of research                       recovering electric power converters
                                       The fields of research are mainly        with decreased package sizes and
                                       application-oriented and contain the     manufacturing costs. These electric
                                       following topics:                        power converters are almost entirely
                                                                                instantiated by electronic compo-
                                       Electrical drive control                 nents. The result has got the best
                                       Motion is the basis for many techni-     prerequisites to be integrated into
                                       cal systems like machine or plant        electrical drives.
                                       construction in car technologies or      EMC
                                       medical devices. For the develop-
                                       ment of enhanced systems, im-            High-frequency waves are spread in-
                                       provements in dynamic, precision         and outside of electric power con-
                                       and smooth running are required. In      verters as a result of the quick
                                       this case, the control of electrical     switching of currents and voltages.
Prof. Dr.-Ing. Bernd Orlik has stud-                                            This can cause malfunction of the
ied electrical engineering at the      drives is an important premise. In
                                       this field, the IALB has expertise       electric power converters or the
Technical         University       of                                           surrounded systems. In the windings
Baunschweig.                           and experience in many respects
                                       like rotary speed control, positioning   of electrical drives, these waves can
From 1981 until 1986, he worked as                                              cause over voltages that are able to
a science assistant at the Institute   control, online and offline parameter
                                       identification of electrical drives as   destroy the windings after some
for Electrical Machines, Traction and                                           period. Therefore, optimized set-ups
Drives at the Technical University of  well as adaptive control.
                                                                                and filters are developed in the IALB
Braunschweig. He received the Dr.-
Ing. degree in electrical
engineering with the re-
search field of drive con-
trol in 1987.
From 1986 until 1994, he
worked at the companies
Lenze GmbH & Co KG
and Piller GmbH.
Since October 1994, he is
the Professor for electrical
drive engineering at the
University of Bremen.
He is also member of the
program-committee of the          Parameter identification and control of a 3-phase AC machine without sensor
                                                                             Institute for Electrical Drives,
                                                                           Power Electronics and Devices
to prevent        these   waves          form
In electrical drive and plant con-
struction, the tide is fortified to sim-
plify the mechatronics and the proc-
ess functions by the combination of
power electronics and freely pro-
grammable control technical struc-
tures. In this field, the IALB is devel-
oping controls for elastic two mass
system controls, motion controls,
and linear moving system controls
as well as electrical direct drives for
industry and traction applications.
Decentralized electric power
In decentralized electric power                                    Generator system for wind power plants and ships
plants like wind power plants and               tive solutions. In this field, the IALB   tems.
photovoltaic, power electronics is              is developing automatic controls to
increasingly the premise for innova-            optimize technical-economical sys-        Contact
                                                                                          Dr.-Ing. B. B. Orlik
                                                                                    Prof. Prof. Dr.-Ing. Orlik
                                                                                    Otto-Hahn-Allee NW 1
                                                                                          Kufsteiner Str. NW1
                                                                                          28359 Bremen
                                                                                    28359 Bremen
                                                                                          Phone: +49
                                                                                    Tel. 0421 - 218 421 218-4436
                                                                                          Fax:    +49 421 218-4318
                                                                                          e-mail: 218 4138
                                                                                    Fax: 0421 - Orlik@IALB.uni-bremen.de
                                                                                    E-Mail: b.orlik@ialb.uni-bremen.de

   α2,Set     Pre-         α1,Set                               Two-mass
             control                                             system

   mWS          ∆α-                                estimation

             Drive control for systems with coupled masses
                                                                     Institute for Electrical Drives,
                                                                   Power Electronics and Devices
      Prof. Dr. phil. nat.               Main research
        Dieter Silber                    The research interests mainly con-
                                         centrate on aspects of semiconduc-
                                         tor power devices and all aspects of
                                         their integration.
                                         Silicon - material properties
                                         Transport- and recombination proc-           Recombination distribution
                                         esses in silicon are fundamental for         within a solarcell
                                         the understanding of power devices
                                         and solar cell functions. Thus, meth-
                                         ods to investigate these parameters      The activities in the field of silicon
                                         are developed. These works are           parameters and the investigation
                                         typical for the fringe area between      methods for power electronic de-
                                         solid state physics and electrical       vices implicate a close connection to
                                         engineering.                             the physics of solar cells.

Studies on solid state physics, Ph.D.
graduation in 1970 at the University
of Frankfurt, afterwards member of
scientific staff and later head of the
department of basic studies and
development of semiconductor-                                                                       dynamical
power devices at the AEG research                                          latching                 avalanche
institute, since 1986 professorship at
                                            normal condition                     failure conditions
the University of Bremen.
                                               Electron current density in the source-area of an HV-IGBT

                                                                                  Simulation and modeling,
                                                                                  design of power devices
                                                                                  The behaviour of power devices is
                                                                                  investigated by simulating the inter-
                                                                                  nal electric fields and current distri-
                                                                                  butions and by analyzing the compli-
                                                                                  cated electrical and thermal interac-
                                                                                  tions. This also leads to concepts for
                                                                                  novel devices. Furthermore models
                                                                                  for devices in power electronic cir-
     TRMC-setup for contactless local recombination measurements                  cuits are developed on this base.
                                                                                                 Institute for Electrical Drives,
                                                                                               Power Electronics and Devices

         Power Losses                                                                                         soldering areas
              u(t)                                                                      v(t)

                                                                                 Disturbance of the
                                                                            y(t) Measured Temperature

                                                         x(0)                    y(t)
             w(t)                                x              x
                                    b                ∫                  C
        Distubance                                                               Estimation
        of the                                       A          x (t)            of the Temperature
        Power Losses      State-Space-Observer

                                 Temperature monitoring by observation

                                                                                                           Thermomechanical shearing
                                                           High-voltage integration and                    strain in large soldering areas
                                                           „Smart Power“                                  integrated systems
                                                           High voltage integration includes              In the high power range, monolithic
                                                           power electronics and micro elec-              integration is not possible. The
                                                           tronics. It is especially important in         subsystems are integrated in com-
                                                           the automobile industry. The main              pact modules. Investigations con-
                                                           problems result from high ambient              centrate on thermal and thermal-
                                                           temperatures as well as internal               mechanical problems of the con-
                                                           isolation standards.                           struction technique as well as inter-
             Si-SiO2-Structure                                                                            nal inductive effects and EMC-prob-
      High-voltage-relay with in-                          Power modules and
      tegrated bidirectional IGBT
      in SOI -technique

   Prof. Dr. phil. nat. D. Silber
Prof. Dr. phil. nat. D. Silber
   Kufsteiner Straße NW1
Otto-Hahn-Allee NW 1                                                                                  2
   28359 BREMEN
28359 Bremen
   Phone: +49-421-218-4436                                                   C
            - 218 62694
Tel. 0421 +49-421-218-4318
   e-mail: D.Silber@et.uni-bremen.de
Fax: 0421 - 218 4138                                                         Eddy current distribution in a power module
E-Mail: silber@uni-bremen.de
                                                        Institute for Electrical Drives,
                                                      Power Electronics and Devices

Connections to the IALB:
Tram, lane 6:              from airport via main station to University/NW1
Bus, lane 630, 670         from main station to University/NW1
Bus, lane 21               from Sebaldsbrück to University/NW1

How to find the IALB: 1st floor, south wing of the NW1 building
room number of the secretariat: S1430

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