AN-4140 Transformer Design Consideration for Offline Flyback Converters Using Fairchild Power Switch ( FPS TM ) 1
For flyback coverters, the transformer is the most important factor that determines the performance such as the efficiency, output regulation and EMI. Contrary to the normal transformer, the flyback transformer is inherently an inductor that provides energy storage, coupling and isolation for the flyback converter. In the general transformer, the current flows in both the primary and secondary winding at the same time. However, in the flyback transformer, the current flows only in the primary winding while the energy in the core is charged and in the secondary winding while the energy in the core is discharged. Usually gap is introduced between the core to increase the energy storage capacity.
Electromagnetic Shielding Handbook for Wired and Wireless EMC Applications
Foreword. Preface. 1. Introduction to System EMI and EMC. 2. Understanding Electromagnetic Shielding. 3. Transfer Parameters of Electromagnetic Shields and Enclosures. 4. EMI Environment and Electromagnetic Coupling in Shielding. 5. Shielding Effectiveness for EMI Protection. 6. Shielding Measurement Techniques and Apparatus: The Tools of the Trade. 7. Shielding Engineering. 8. This Brave New Old World of Electromagnetic Shielding. 9. Appendix: Selected Topics in Electromagnetics and Circuit Theory. Bibliography. Index.
Computer-Aided System of Virtual Testing of Gas Turbine Engines
The article describes the concept of a virtual lab that includes subsystem of gas turbine engine simulation, subsystem of experiment planning, subsystem of measurement errors simulation, subsystem of simulator identification and others. The basis for virtual lab development is the computer-aided system of thermogasdynamic research and analysis “ASTRA”. The features of gas turbine engine transient modes simulator are described. The principal difference between the simulators of transient and stationary modes of gas turbine engines is that the energy balance of the compressor and turbine becomes not applicable. The computer-aided system of virtual gas turbine engine testing was created using the developed transient modes simulator. This system solves the tasks of operational (throttling, speed, climatic, altitude) characteristics calculation, analysis of transient dynamics and selection of optimal control laws. Besides, the system of virtual gas turbine engine testing is a clear demonstration of gas turbine engine working process and the regularities of engine elements collaboration. The interface of the system of virtual gas turbine engine testing is described in the article and some screenshots of the interface elements are provided. The developed system of virtual gas turbine engine testing provides means for reducing the laboriousness of gas turbine engines testing. Besides, the implementation of this system in the learning process allows the diversification of lab works and therefore improve the quality of training.