Category | September

The Help of Thermal and Mechanical Analysis

Posted on 01 September 2006

       Modules to handle higher power levels Power electronics applications continue to demand cost-effective power modules with ever-increasing efficiency and performance. Semikron is meeting this need by introducing the SEMITOP 4 “baseplateless” module. By Fabio Brucchi, Semikron Italia   This device retains the SEMITOP family’s “one screw mounting” technique, while handling up to [...]

Innovative Cooling Concept for Power Modules

Posted on 01 September 2006

       High thermal performance gives high reliability solutions ShowerPower, a newly developed cooling concept, solves the key problems related to liquid cooling, namely the high cost and the inhomogeneous cooling. The challenges for future liquid cooled power module assemblies, especially in hybrid electrical vehicle traction applications, can be met by the ShowerPower cooling [...]

The SmartRectifier in Practical Design

Posted on 01 September 2006

       A step forward for secondary-side rectification Power supply architecture has become a major issue in product design over recent years. At the core of this trend has been the decrease in digital IC voltages, while overall power densities have moved in the opposite direction. By Mario Battello, International Rectifier   Change has [...]

Interleaving Enhances Power Factor Corrector Performance

Posted on 01 September 2006

       Interleaving reduces dramatically the ripple current amplitude To limit the input current harmonics drawn by the off-line equipment, several international regulations, such as the EN61000-3-2 are in place. In order to limit the harmonic currents, power factor correction (PFC) circuits are used. By Marcus Zimnik, Texas Instruments   The need for power [...]

Analog Transmission Across Digital Barriers

Posted on 01 September 2006

       An RF carrier is modulated instead of light Acquiring high quality analog signals from extreme and often hazardous environments while protecting the operator can be a difficult task. This article investigates various methods to acquire analog signals in hazardous environments while using opto-couplers or novel digital isolator technology. By Keith Coffey, Silicon [...]

New Applications for Hall-Effect Current Sensors

Posted on 01 September 2006

       Sectors where sensors provide optimal solutions Hall-effect current sensors offer an inherent benefit over other solutions in that there is isolation between the current path and the sensing and interface electronics. By Andreas Friedrich, Allegro MicroSystems, Europe   The innovative packaged current-sensing solutions featured in this article are based on a low-resistance [...]

Ultracapacitors - Powering the Shift to Hybrid Electric Vehicles

Posted on 01 September 2006

       Long cycle life and excellent cold temperature performance Today, car manufacturers and suppliers are increasingly aware of ultracapacitors for use in automotive power-trains and subsystems, and the advantages of the product in meeting their business and technical requirements. By Jürgen Auer, Maxwell Technologies   Ultracapacitors are becoming a standard energy and power [...]

How to Select an Off-The-Shelf Current Transformer

Posted on 01 September 2006

      A simple guideline can greatly help In electronic systems applications such as switch-mode power supplies, current transformers are generally used for control, circuit-protection, and monitoring features. By Ariel General, Senior Design Applications Engineer, Datatronics, Inc.   Engineers have relied on current sense transformers as the ‘gold standard’ for precise measurements in instrumentation [...]

Crystal Oscillator Design and Negative Resistance

Posted on 01 September 2006

      Active elements must be able to function with crystals of varying parameters There is a discrepancy, however, in the measured negative resistance in comparison to the simulated start-up negative resistance. Differences in signal and impedance levels coupled with circuit nonlinearities are a major part of the measurement discrepancy. By Anthony M. Scalpi, [...]

The Next BIG Thing Part 2

Posted on 01 September 2006

      BIG Thing Technology In Part 1 of the August issue, The Next BIG Thing was characterized as whole-house Digital Media over AC Power Lines - instant digital media access from every, and any, location in the home. That includes whole-house access to the Internet and TV/IPTV/Video (both standard and high-definition video). By Mark E. [...]