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This paper presents a galvanically isolated two channel measurement system for voltage and current measurement in medium-voltage dc-dc converters with more than 1 kV operating voltage. The system uses delta-sigma modulation and signal multiplexing to transmit the digitalized signals over fiber optical cables. In combination with a current-loop power supply, high noise immunity and excellent electrical...
In order to develop power electronic systems with high power densities the performance of the cooling system has to be increased. Thereby, the thermal resistance of power semiconductor modules is an important design aspect. However, the thermal resistance of modules is influenced by cross-coupling effects which are dependent on the module layout and the heatsink. These cross-coupling effects are not...
This paper presents a galvanically isolated gate driver system for medium voltage SiC-MOSFETs. A low common mode coupling capacity of 1 pF and good electrical insulation of the gate driver power supply are achieved by using a current-loop AC-bus power supply. The power semiconductor is protected against unintentional self-turn-on by a low resistance gate path that is active while the gate driver is...
Dc-dc converters are a promising technology for interconnection of future dc grids. Besides the relatively low volume and space requirements, dc-dc converters provide good controllability of the power flow. This is particularly important with regard to a more decentralized energy generation, where a fully bidirectional power flow — even between grids of equal voltage levels — is desired to increase...
Recently, it has been shown that the operating modes of a three-phase dual-active-bridge (3ph-DAB) DC-to-DC converter can be altered. This can be used in particular to enhance low load efficiency. The different operating modes show significant differences concerning the utilization of the core material and the required filter effort. In this paper, an enhanced operating strategy including a dynamic...
Lumped Parameter Thermal Networks (LPTNs) are widely used to predict the thermal behavior of electrical machines. The networks usually have a simple structure and low number of nodes to limit the build-up effort, which reduces the spatial resolution of the thermal modeling. This paper presents a methodology that allows automated generation of high-order space-resolved LPTNs for electrical machines...
Electrical drives with open-end winding configurations offer certain advantages over drives with star-connected windings such as higher dc-link voltage utilization and lower inverter losses. However, there are a couple of drawbacks like circulating currents, diminishing the performance of the drive. This paper compares the performance of inverter and drive configurations with star-connected windings...
Three-phase dual active bridge (3p-DAB) dc-to-dc converters are typically avoided in low-power applications especially for wide voltage and power ranges. Even so, the 3p-DAB do offer a means to reduce filter costs and volume. The aim of this study is to propose the triangular and trapezoidal modulation for the 3p-DAB to address the problem of poor partial load efficiency. The proposed modulation schemes...
In this paper, a comparison of a single-phase and a three-phase dual active bridge for electric vehicle application is presented. The converters are used to connect the traction battery stack with the 12V on-board power supply. The characteristic challenges are illustrated on the basis of an application with 2kW rated power. In total, three different design approaches are described and assessed using...
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