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Efficiency evaluation is critical in modern power converter design. For hard-switching converters, the Eon/Eoff is the key to calculating switching losses. Although some datasheets provide the Eon/Eoff curves, the data generated are usually under a typical operating condition. In this paper, the switching loss distribution for GaN HEMTs is summarized. A simple and practical step-by-step Eon/Eoff scaling...
In this letter, we propose a wideband F-shaped microstrip antenna. The proposed antenna is compact with a dimension of 18 × 22× 1 mm3, which is a benefit for the miniaturization of the antenna system. The electromagnetic properties of the antenna are analyzed with the software CST Microwave Studio, and the measurements are performed by using a vector network analyzer. By means of a structural parameters...
This paper introduces a novel tangential radial hybrid excitation synchronous generator (or T/R-HESG, for short). Firstly, the author deeply analyses its magnetic path model, completes the design and gives some improved methods with the assistance of Ansoft Maxwell 14 software. Then the author developed two models of T/R-HESG, but only one, a 380V/1.5KVA prototype, has been fabricated and its corresponding...
A high-speed, small volume, light weight, high efficiency and power density generator for the miniature turbojet system has been gradually investigated. This paper focuses on the design of a 500W, 100000rpm generator suitable for use with the turbojet system. The design procedure selects the suitable machine type, at the same time, the rotor structure, the design of stator and windings are discussed...
The underlying correlation between gait time series and the different physiological states is investigated by means of complexity measure in this paper. The definition and algorithm of Lem-Ziv complexity are introduced first, and then the gait data analysis was implemented by using this method. The results show that a strong relation between the age and the gait complexity was found, such as the older...
The traditional land-use planning (LUP) management is complicated and long-time cycle needed, which affected the implementation and management of land use planning in a certain extent. On the basis of analysis of the main content and features of land use planning management, and components of ArcGIS technical development, this paper discusses the technology and methods which realize the land use planning...
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