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Bi-Directional Isolated DC-DC Converter for Next-Generation Power Distribution - Comparison of Converters using Si and SiC Devices
(2007)2007 Power Conversion Conference ProceedingsIn this paper two bi-directional DC-DC converters for a 1MW next-generation BTB system of a distribution system, as it is applied in Japan, are presented and compared with respect to design, efficiency and power density. One DC-DC converter applies commercially available Si-devices and the other one high voltage SiC switch, which consists of a SiC JFET cascode (MOSFET+1 JFET) in series with five SiC JFETs. In the comparison also the high ...Conference Paper -
Computationally Efficient Integration of Complex Thermal Multi-Chip Power Module Models into Circuit Simulators
(2007)2007 Power Conversion Conference ProceedingsFor analyzing reliability or short-term overload conditions of power electronic systems, it is necessary to know transient temperatures of the power semiconductors. Directly coupling thermal and circuit simulators increases the simulation time by orders of magnitude, therefore making such an approach impractical. A well-known solution to this problem is to extract thermal equivalent circuits from 3D-field simulations and to insert them ...Conference Paper -
5kV/200ns Pulsed Power Switch based on a SiC-JFET Super Cascode
(2008)Proceedings of the 2008 IEEE International Power Modulators and High-Voltage ConferenceIn many pulse power applications there is a trend to modulators based on semiconductor technology. For these modulators high voltage and high current semiconductor switches are required in order to achieve a high pulsed power. Therefore, often high power IGBT modules or IGCT devices are used. Since these devices are based on bipolar technology the switching speed is limited and the switching losses are higher. In contrast to bipolar devices ...Conference Paper -
Novel Concepts for Integrating the Electric Drive and Auxiliary Dc-Dc Converter for Hybrid Vehicles
(2007)APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and ExpositionCost, volume and weight are three major driving forces in the automotive area. This is also true for hybrid vehicles which attract more and more attention due to increasing fuel costs and air pollution. In hybrid vehicles the energy distribution system causes a significant share of the volume and the costs. In order to reduce the costs and the volume of this system two new concepts for integrating the dc-dc converter, which transfers the ...Conference Paper -
Combined radial-axial magnetic bearing for a 1 kW, 500,000 rpm permanent magnet machine
(2007)APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and ExpositionUltra-high-speed and high-power-density drives are attracting much interest in today's industry. For instance, there are several investigations into mesoscale gas turbine generator systems and turbocompressors for fuel cells. In all ultra-high-speed machinery the bearing is a key technology. Therefore, this paper focuses on the design of a 500,000 rpm active magnetic bearing suitable for use in a 1 kW PM machine to complete an ultra-high-speed ...Conference Paper -
Double-Stage Gate Drive Circuit for Parallel Connected IGBT Modules
(2008)Proceedings of the 2008 IEEE International Power Modulators and High-Voltage ConferenceIn more and more pulsed power applications solid state modulators are applied. There, often IGBT modules must be connected in parallel due to their limited power handling capability. For balancing the currents in the IGBTs a control method adapting the gate signal of the single IGBTs has been presented in a previous paper. Besides the current balancing also the fall and rise times of the voltages/currents are crucial as they significantly ...Conference Paper -
A new 3-phase buck-boost unity power factor rectifier with two independently controlled DC outputs
(2007)APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and ExpositionA new 3-phase buck-boost unity power factor rectifier consisting of a 3-phase bridge buck PFC rectifier and two boost dc-dc converters connected in series is proposed for an industrial application where two independent output voltages need to be controlled. This paper presents the proposed topology and the requirements for this application. The proposed and alternative topologies are briefly compared. Through this comparison, it is shown ...Conference Paper -
Comparison of Performance and Realization Effort of a Very Sparse Matrix Converter to a Voltage DC Link PWM Inverter with Active Front End
(2005)Proceedings. The 2005 International Power Electronics Conference, IPEC-Niigata 2005, April 4 - 8, 2005, Toki Messe, Niigata, JapanConference Paper -
Mesoscale Electric Power Generation From Pressurized Gas Flow
(2008)Journal of Micromechanics and Microengineering ~ Invited papers from the 7th international workshop on micro and nanotechnology for power generation and energy conversion applications (PowerMEMS 2007)Conference Paper -
Novel converter concept for bearingless slice motor systems
(2006)Conference record of the 2006 IEEE Industry Applications ConferenceConference Paper