Contactless Energy Transfer (CET) Systems – A Review
Recently, the contactless energy transfer (CET) systems are developed and investigated widely. This innovative technology creates new possibilities to supply mobile devices with electrical energy because elimination of cables, connectors and/or slip-rings increase reliability and maintenance-free operation. The aim of this work is review of power electronics based CET systems. Various techniques of the CET systems are divided according to a medium used for energy transfer and presented in the following groups: 1) sound based CETs, 2) light based CETs, 3) capacitive based CETs, 4) and the largest group of inductive coupled CET systems.
The basic principles and the latest developments of these techniques with special focus on inductively coupled CET solutions have been systematically described in this work. The advantages and limitations have been briefly examined, and the application field where each technique is particularly suited has been indicated. Also, examples of vehicle to grid (V2G) technology based on inductive coupled CET systems are presented.
Some oscillograms that illustrate properties of the discussed techniques have been shown
Advanced Power Module Packaging for Increased Operation Temperatures and Power Densities
Power Electronics is a key enabling technology forthe effective and efficient generation, distribution, and use of electrical energy. In the range of kW to MW, power semiconductor modules play a key role in power electronic systems. Whereas in the past decade the R&D work on materials and processes to manufacture such modules was more motivated by continuous improvement, more drastic changes are emerging nowadays. This is driven by the urgent need for much higher power densities, for higher reliabilityand further cost reduction. Also the requirements imposed by wide band gap semiconductors need now seriously to be addressed. Therefore this paper will present an overview of material and process developments which enable such improvements. In particular,the paper will highlightthe latest innovations in die attach technologies as well as the potential of direct liquid cooling and system integration.
Electric traction system was started by direct current power supply and motors at Berlin Industrial Exhibition in 1879. Alternate current power supply and motors was in revenue service at mountain railway of Swizterland in 1898. After that, according to economical growth, high speed and high power electric traction system was realised as important communication.
Power electronics devices such as diode, thyristor, IGBT, is the key compornent of electric traction system development. I will present you about the present status and future prospect of electric traction systems in hope.