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To achieve high power-density isolated dc-dc converter, gallium nitride high electron mobility transistors (GaN-HEMTs) and planar transformer have been used. Also, for the high power-density design, these components are placed close to each other. GaN-HEMTs are significantly affected by the leakage flux of the planar transformer, because of their lateral structure. Therefore, the mutual effects of...
Lateral-Stator Machine (LSM) topology is presented in earlier works as an unconventional machine that is advantageous for high-speed, direct-drive applications in confined spaces. Owing to its peculiar geometry, LSM makes use of the additional space in a tool head that cannot be utilized by standard Cylindrical-Stator Machines (CSMs). However, a fair and quantitative comparison of LSM and CSM topologies...
This paper presents the design, fabrication, and characterization of on silicon integrated micro-transformers for high frequency power applications. The microtransformer device is used and tested in DC-DC converter application at high switching frequency. This device has stable L vs. f characteristic up to 50 MHz. The design is improved regarding to the electrical resistance and current capability...
This paper presents an integrated power module with the features of high power density and high efficiency. A multi-functional integrated magnetic component is designed. The component has the roles of both the filter inductor and the case of the whole power module. With the assist of finite element analysis (FEA), design and optimization of the proposed inductor are demonstrated. It has higher inductance...
This paper presents the modeling, simulation and design guidelines of a high density power inductor for battery power unit (BPU) in order to reduce weight and size especially in automotive applications. A ∼4.5µH 30A high current density low profile permanent magnet power inductor (PMPI) design is developed and evaluated. By placing a small piece of NdFeB permanent magnet in the air gap of conventional...
This paper presents a new bidirectional multilevel modular switched-capacitor dc-dc converter for high voltage and high conversion ratio application with low capacitor voltage rating. For the high voltage and high conversion ratio application, high voltage capacitor with good performance will not be available either, like the switching devices. For the traditional multilevel modular switched-capacitor...
Inductive components play an important role in filtering the switching harmonics related to the pulse width modulation in voltage source converters. Particularly, the filter reactor on the converter side of the filter is subjected to rectangular excitation which may lead to significant losses in the core, depending on the magnetic material of choice and current ripple specifications. Additionally,...
The commercial gate drivers are available upto 6.5 kV IGBTs. With the advances in the SiC, power devices rated beyond 10 kV are being researched. These devices will have use on medium voltage power converters. Commercial gate drivers rated for such high voltages are not available. These power devices have very high dv/dts (30–100 kV/µs) at switching transitions. Such high dv/dts bring in challenges...
A systematic method of designing a zero-ripple Ćuk converter for PV/Battery-to-grid applications is presented in this paper. The integrated magnetic core design uses an intuitive flux-reluctance model to arrive at the Area Product for this kind of structure. Unlike the earlier designs for this converter, it provides a completely analytical approach to design this converter for a range of specifications...
High power isolated DC-DC converters are likely to provide solutions for many technical challenges associated with power density, efficiency and reliability in potential applications such as offshore wind farms, inter-connection of DC grids, MVDC in data centers and in future solid state transformer applications. The high power medium frequency transformer (HPMFT) is one of the key elements of such...
1m-off long distance and high efficiency inductive power transfer system (IPTS) with optimal shaped dipole-coil structure is proposed for home appliance charging applications. Conductive reflectors for transmitter (Tx) and receiver (Rx) dipole coils are investigated to improve power efficiency and to mitigate electromagnetic field for human safety. By adopting the Tx reflector behind the Tx core,...
Many high power converter systems are often connected to the medium voltage network using a step-up transformer. In such systems, the converter-side windings of the transformer can be configured as an open-end and multi-level voltage waveforms can be achieved by feeding these open-end windings from both ends using the dual-converter. An LCL filter with separate converter-side inductors for each of...
An optimized core design for wireless power transfer system for hybrid vehicle application is proposed in this paper. One of the main challenge of wireless power in hybrid vehicle charging application is the limited distance range and significant efficiency drop under small misalignments between the transmitter (Tx) and the receiver (Rx) coil. Appropriately designed transmitter and receiver coil with...
Point-of-load converter at light load has low efficiency owing to the “fixed losses” such as core loss and ac winding loss. This paper focuses on two-dimensional (2D) gapping of a ferrite core to shape inductance versus load current to reduce inductor loss at light load. Since the maximum inductance of conventional stepped gap is limited by the cross-sectional area of the thin gap, a 2D gap is formed...
The iron losses of three-phase inductor used in a three-phase pulse-width modulation (PWM) inverter are evaluated. First we clarify three-phase inductor design in order to make same inductance value between the each phase. Then based on the design, iron losses for various structure of inductor are simulated. Simulation result shows the iron loss can be reduced about 5% by changing structure from conventional...
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