Chunyan Li

In this paper, the influences of leakage inductances are investigated for the integrated transformer of an input-series flyback converter, in which each input-series circuit is based on the single-switch flyback topology. First, the configuration of this converter is introduced, and a novel multiple-inductor coupling model is proposed for its flyback integrated transformer. Second, the operational process of this converter is analyzed by considering the leakage inductances between the primary and secondary windings of its integrated transformer. Third, the influences of these leakage inductances are analyzed; on this basis, the essential design considerations of the flyback integrated transformer are summarized. Finally, an experimental prototype of this input-series converter is built. Based on this, the analysis is verified by the experimental comparisons among three flyback integrated transformers with various winding layouts.

In this paper, the leakage inductances influences of integrated-transformer are investigated for an input-series flyback converter, in which each input-series circuit is based on the single-switch flyback topology. First, configuration of this converter is introduced, and a novel multiple inductors coupling model is proposed for its flyback integrated-transformer. Second, operational process of this converter is analyzed considering the leakage inductances between primary and secondary windings of its integrated-transformer. Third, influences of these leakage inductances are analyzed, on this basis, the essential design considerations of flyback integrated-transformer are summarized. Finally, an experimental prototype of this input-series converter is built, based on which, the analysis is verified by the experimental comparisons among three flyback integrated-transformers with various windings layouts.

The d-axis inductance (Ld) of the negative-salient permanent magnet synchronous motor (NSPMSM) is larger than the q-axis inductance (Lq). Compared with the

In accordance with the guiding opinions of the China Engineering Education Accreditation Association, combined with the demands of talent cultivation under the background of the new engineering and the characteristics of the course itself, aiming at the comprehensive development of knowledge, abilities, and qualities, the course content is optimized and integrated to balance theory, simulation, practice, and application, constructing an integrated course resource system. A teaching design of theory-practice integration is proposed, and a multi-dimensional blended teaching mode incorporating online and offline elements and multi-mode teaching methods are utilized for teaching practices. A comparative analysis is conducted between the teaching effects of this blended teaching approach and traditional teaching methods, with results indicating a significant improvement in teaching quality with the blended teaching approach. The course resources and teaching models can be transferred and utilized in the same type of courses across different majors in the college, by multiple instructors, and in various teaching classes, achieving resource sharing and excellent effects.

Under the background of the ideological and political construction of specialized courses, teachers should fully explore and integrate the elements of ideological and political construction in the curriculum according to the characteristics of their specialized courses. Ideological and political teaching is integrated in the specialized course naturally. The teachers of specialized courses in universities assume the new role of professional education and ideological and political education. Electronic technology is one of the important required courses for the major of mechanical design, manufacturing and automation. On the basis of analyzing the characteristics of electronic technology course, the integration of electronic technology course content and ideology and politics is explored. The ideological and political reform of electronic technology course from the aspects of the exploration point of ideological and political integration into the course content, and the means of ideological and political content integration into the specialized course in the class is explored. It provides a useful reference for the reform of specialized courses integrated into ideological and political education.

A parallel primary windings (PWs) scheme is investigated for the integrated-transformer of the flyback input-series transformer-integration (ISTI) converter. Compared to the existing layer-by-layer PWs, the parallel PWs are easy to be manufactured, and active input voltage sharing performance of the converter can be improved if the parallel PWs scheme is adopted. Energy influences of the stray capacitances are slightly larger in the parallel PWs than those in the layer-by-layer PWs, but this difference will decrease as the layer number of each PW increases. Based on the two-transistor flyback ISTI converter, the parallel PWs is analyzed in detail compared to the layer-by-layer PWs, through which applications of the parallel PWs scheme are concluded. Finally, experimental comparisons have been done on a laboratory-made flyback ISTI converter with five different integrated-transformers, and the theoretical analysis is verified by the experimental results.

The input-series transformer-integration (ISTI) converters are suitable for the high-input voltage multiple-output applications. In these converters, interprimary-winding capacitances are the unique stray capacitances of the integrated transformer, and energy influences of these capacitances cannot be ignored in the high-voltage applications. In order to analyze energy influences of the interprimary-winding capacitances, in this article, a four-capacitor model is proposed to represent these capacitances within arbitrary two primary windings of the integrated transformer. Based on the proposed model, energy varying of the interprimary-winding capacitances is analyzed in detail during each switching period. Furthermore, estimation of the four lumped capacitors is discussed. Finally, three different integrated transformers are designed for a 1-kV/60-W laboratory-made flyback ISTI converter, and validity of the proposed model is verified through the simulating and the experimental comparisons of these integrated transformers.