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Semiconductors and Gate Driver
Circuits:
•
Parallel operation of uni- and bipolar
power devices
•
Measurement and characterization of
power semiconductors
•
Modular high-voltage switches featuring
reduced gate driver power consumption
•
Gate driver circuits for IGBTs, MOSFETs
and JFETs for switching frequencies up
to 500kHz
•
Analysis and experimental verification of
wide bandgap semiconductors (active
and passive silicon carbide and gallium
nitride devices)
Modeling and Simulation:
•
Real-time simulation (hardware-in-the-
loop) of power converters
•
Simulation of power converter topolo-
gies (e.g. resonant converters for lighting
applications)
Miscellaneous:
•
FPGA based active harmonic compen-
sation
•
Calorimetric tests of passive components
POWER ELECTRONICS
Helmut Schmidt University
University of the Federal Armed Forces Hamburg
Introduction:
The Helmut Schmidt University is a campus
university with four faculties where 2500
bachelor and master students are taught.
Within the faculty of electrical and infor-
mation engineering the chairs of electri-
cal machines and drives, electrical power
systems and power electronics are respon-
sible for the education in electrical engi-
neering. These institutes are characterized
by their effective cooperation and an ex-
cellent technological infrastructure. Since
2007 Prof. Hoffmann has been the chair
of power electronics. His team currently
consists of seven PhD students, one prin-
cipal engineer and three engineers in the
laboratory.
Research Scope and Competence Fields:
Power Topologies and Converter
Technology:
•
Analysis and experimental verification of
high frequency switching converter to-
pologies
•
Design of load resonant high power in-
verters with switching frequency above
200kHz
•
Efficiency improvement of Uninterrupt-
ible Power Supplies (UPS)
•
Modular and interleaved controlled DC-
DC-converters
•
Multilevel converter topologies
Laboratory Equipment:
Hardware:
•
AC power supplies up to 500V with a
maximum power of 200kVA in a fre-
quency range from 15Hz up to 400Hz
•
DC power supplies with a voltage range
of ±440V and a maximum power of
100kW
•
Programmable DC power supplies up to
1000V and 150kW
•
Precision multi-channel digital oscillo-
scopes with bandwidths up to 1.5GHz
and sampling rates of 20GS/s
•
Miniature Rogowsky-current-transduc-
ers with a bandwidth of 200MHz
•
Digital frequency analyzers and preci-
sion power function meters
•
Precision high power curve tracer (up to
3kV and 400A) for power semiconductors
•
Optical and fibre optical temperature
measurement systems
•
Precision Climate chamber
•
High voltage sources up to 60kV
Software tools:
•
MATLAB/Simulink, SIMPLORER, PLECS,
Mathcad, LTSpice, LabView, RT-Lab
Gate driver circuit with internal protection
High frequency multilevel inverter
Liquid-cooled DC-DC-converter with very high
power density
