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- Air conditioning;Electric potential;Biological system modeling;Production;Automobiles;Next generation networking;Engines (1)
- DC power supply ; Design ; Converter circuit ; Measurement ; Power Supply (1)
- DC/DC converter ; efficiency ; tapped transformer ; wide input voltage range (1)
- Model predictive control, FCS-MPC, VSP2CC, VV-MPC, multi-phase, PMS (1)
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Development of a Two In One Motor System as a new Vehicle Energy Concept for Next Generation Car
(2020)
A shorter product life cycle and therefore, reduced
project duration is the major success factor for machinery and
plant engineering today. One use case for Virtual Commission-
ing (VC) is the early software test without an existing plant.
The primary effort of VC lies in the manual creation of the
plant model. There are various simulation tools with different
advantages available. Selecting one tool has consequences for
the whole engineering process. The exchange of models across
different tools is not possible or discouraged by the respective
vendors due to various reasons. This paper describes a concept to
exchange behavior models via the table-based import interfaces
for an automated model generation within common simulation
tools. The concept utilizes an approach to exchange the behavior
of components using the vendor-neutral and standardized pro-
gramming language PLCopenXML containing all IEC 61131-3
programming languages. This removes the main obstacle for a
broader industrial application of VC, as it minimizes the manual
effort for creating and exchanging behavior models through the
use of standardized library elements and existing interfaces.
Design of a Wide Input Voltage Range Current-Fed DC/DC Converter Within a Reduced Duty-Cycle Range
(2020)
A design of a current-fed push-pull converter for wide input voltage ranges within a reduced duty-cycle range is presented. Based on the converter conversion ratios of three different clamping configurations, the potential of the input clamping is shown analytical, simulative and by measurements. A differentiation is made between the four possible operating modes, which can be distinguished in the control of the semiconductors and the magnetomotive force in the reactor. By optimizing the turn ratios of both transformers, the wide input voltage range capability of the input clamped current-fed push-pull converter was improved, which has been proved by measurements on a real prototype.
A transformer with variable primary windings for wide input voltage range DC/DC converters is presented. This transformer structure allows three states of the primary winding to be converted by only two individual windings. Based on the evaluations of a two-switch flyback converter, the potential of DC/DC converters with variable structures, the implementation of such a transformer and the advantages and disadvantages are shown and discussed. Real measurement results demonstrate the noticeable increase in efficiency and the reduction in component stress, having a positive influence on the operation of the converter and the component selection during the design process.
Depending on the application range, there are various recommendations in the literature which converter topology should be used. These are mostly based on experience or more or less deeper considerations. For DC/DC converters, which are operated over a wide input voltage range, such recommendations rarely exist. Therefore, this contribution shows the evolution of two input voltage dependent selection matrices, which should facilitate the selection of future topologies based on known publications and basic considerations. The focus here lies on converters for λ = V i_max /V i_min ≥ 3 with galvanic isolation. First, the data set is introduced, where a distinction is made between flyback converters, forward converters and other 1stage or 2stage converters before the evolution of the novel input voltage dependent matrices is carried out. These two matrices support the selection of a suitable topology and whether the energy transfer should be done by one or two stages.
Finite control set model predictive control (FCS-MPC) is a promising method for the control of multi-phase machines, due to its capability to directly account for nonlinearities and multiple controlled variables. To overcome the drawback of high current ripples and excitation of harmonic currents in the so-called xy-subsystem, several methods have been proposed in the literature so far. This paper proposes an MPC-based method that achieves high granularity of switching by not only switching at the discrete time steps, but also within the sampling interval. In doing so, the discussed algorithm, referred to as variable switching point current control (VSP 2 CC), produces low current distortions, while still keeping the advantages of conventional FCS-MPC, such as fast dynamic behavior during transients. To highlight the above, VSP 2 CC is applied to a six-phase permanent magnet synchronous machine (PMSM) and compared with conventional FCS-MPC and MPC that employs virtual voltage vectors (VV-MPC).