Category | November

State-of-the-Art High Frequency Optimized IGBT Modules

Posted on 01 November 2007

      NFH and NFM – Series The introduction of NF Series in the year 2003, which is followed by NFH- and recently developed NFM-Series for medium frequency switching applications considering the application requirements, proved the successful development track record. By Pragad Bhalero and Robert Wiatr, Mitsubishi   In recent years, power semiconductor modules [...]

Multiphase Buck Converters

Posted on 01 November 2007

       Phase management optimize efficiency New microprocessors, DSPs and ASICs demand more and more current while supply voltages decrease. At the same time load transients in the 500A/us range are not unusual. Even during these transients the voltage to the processors has to stay within a narrow window, often +/-3%. In order to [...]

Nd-Fe-B Magnets are Going Offshore in Wind Mill Generators

Posted on 01 November 2007

    Wind Energy in Europe: Status, Hints and Potentials Using permanent magnets in wind mill generators may be of advantage regarding total weight and in special designs even the possibility to incorporate reliable easy gearboxes to reduce maintenance, effort and costs. By Dr. Denis Rollik and Bernd Schleede Vacuumschmelze GmbH & Co. KG, Hanau, [...]

Digital Measurement of Inverter Efficiency

Posted on 01 November 2007

      Measurements on over-modulation PWM An inverter is a type of electric power converter which converts DC into AC. When the DC signal is converted into AC, the output is a pseudo-AC signal which is made by changing the pulse width using a switching circuit. The modulation method used to change the pulse [...]

PIQC – Process Integrated Quality Control

Posted on 01 November 2007

      Multi-dimensional system for bond quality control without production An increasing number of products are focusing on zero failure targets. This implies consideration of every wire bond connection. Apart from the technical challenges for such quality targets, the increasing costs for more sophisticated and/or additional quality measurements have to be considered. By Dipl.-Ing. [...]

Increasing Efficiency in Secondary-Side Rectification

Posted on 01 November 2007

       Replacing Schottky diodes with MOSFETs Electronic products within a broad range of applications have evolved over recent years, taking advantage of advancing signal- and data-processing silicon technologies to achieve greater functional densities. Significant developments in both IC design and IC fabrication have accelerated this trend. By Mario Battello, Marketing Manager, iPOWIR Product [...]

Analysis Tool Covering Wide Application Range

Posted on 01 November 2007

       Portunus supports transient thermal simulations Nowadays simulation tasks go beyond the investigation of individual component behaviour. Despite electrical engineers naturally preferring different software tools to their colleagues developing mechanical components, virtual tests have to consider more than electrical values. This article lists the requirements for system simulation software and how they are [...]

Dedicated Current Monitors Boost System Performance

Posted on 01 November 2007

      To improve power dissipation, efficiency and reliability, electronic systems are increasingly depending on some form of continuous current measurement. Compared to alternative discrete and integrated solutions, dedicated current monitor ICs provide a simple and yet very accurate means of current measurement for a broad range of applications. By Simon Ramsdale, Standard ICs [...]

PLECS – The User-friendly Simulation Program for Power Electronics

Posted on 01 November 2007

       A new approach to simulating power electronic circuits together with their controllers System simulators allow the simple creation of controllers but the power electronics they control must then be described by circuit equations. On the other hand, circuit simulators allow simple circuit creation but the interface to the controller is generally more [...]

New Applications for Optical Sensors

Posted on 01 November 2007

       Triangulation sensor instead of camera Infrared sensors that work using the triangulation principle also measure accurately on reflective surfaces and are not affected by either light scatter or high temperatures. When used with a pyroelectric resistor, the wide-angle versions can even distinguish between people and objects. They can therefore be used in [...]