Category | July

Repetitive Learning Harmonic Current Control in a Load Emulation System

Posted on 15 August 2012

    In an active energy feedback unit of an electronic load emulation system harmonics in the grid currents are compensated by using a repetitive control algorithm By Michael Hausmann, Dominik Dorner, Dr. Norbert Graß and Dr. Bernhard Wagner, Georg Simon Ohm University of Applied Sciences Nuremberg, Germany   Introduction For power electronics development the [...]

Stacked Substrates for High Voltage Applications

Posted on 29 June 2012

    Solving the problem of high electric fields at sharp corners by multilayer structures Modules with a blocking voltage above 1700V are based on Si3N4 or AlN substrates. Special effort is required to manage the high electric fields that occur at the sharp edges of the metal layers on both sides of these ceramic [...]

Silicon Holds Key to ERP Legislation for Fans and Pumps

Posted on 29 June 2012

      The European Union’s Energy-Related Products (ErP) directive will see new efficiency standards for fans and circulator pumps come into force from 2013. Here we consider the impact of the new legislation on fan- and pump-based designs and look at how the latest semiconductor advances are helping designers to address the challenges of [...]

Current Transducers with Advanced ASIC Technology

Posted on 29 June 2012

    Intelligent and Interactive functions implemented in an Open Loop Current Transducer This article describes a new Open Loop Hall effect based current transducer series in which a new generation of ASICs contributes to fast response time, low temperature drifts and extra Over Current Detection functionality. By Yo Makita, Ph. D, D&E Manager, LEM [...]

New Symmetric Voltage Suppressor with Peak Pulse Power and Increased Power Capacity

Posted on 29 June 2012

      By Alexey Surma, Yury Loktaev, Alexander Stavtsev and Anatoly Chernikov, Proton-Electrotex JSC   Typical element of symmetric avalanche voltage suppressor of “conventional” structure is shown in figure 1. The basis for such devices is high voltage “symmetric” p-n-p transistor with lightly doped n-base and two identical smooth p-n junctions. High blocking voltages [...]

Higher Performance for Neodymium Magnets

Posted on 29 June 2012

      High-Anisotropy field Layer (HAL) production process A new method for producing neodymium magnets that takes dysprosium-saving to the extreme. Since they were commercialized in 1983, neodymium magnets (sintered neodymium-iron-boron magnet, TDK product name: NEOREC) have maintained their position as the most powerful type of magnet known to industry. Ba Takahiro Minakuchi, TDK [...]