Category | 2007

The Application-Specific Power Semiconductors Diodes

Posted on 01 December 2007

       One diode technology is not suited for all applications Development trends in high voltage power devices continue to move towards high performance, application-specific devices, and higher levels of integration and advanced packaging. The demand for electricity is increasing and at the same time, the cost of power generation is also going up. [...]

How to Make Linear Mode Work

Posted on 01 December 2007

      Linear mode is in the “saturation” region of the transfer characteristic Linear mode is when a power transistor is operated partially on rather than fully on or fully off. The control or limiting of current through a transistor in linear mode combined with the ability to turn the transistor fully on are [...]

The Ecconowatt Line of Power Semiconductor Packaging

Posted on 01 December 2007

       Ceramic packages exclusively for Power Semiconductors The driving forces in the semi-conductor market make it the correct time to market a low cost ceramic package to the power semi-conductor industry. CNS has patented a low cost ceramic package and has designed the equipment and process to enable customers to assemble and seal [...]

Sensorless and Sensibility - Field Oriented Control Models for AC Motors

Posted on 01 December 2007

       Reducing processing costs and integrated control ICs mean that sensorless motor control techniques are now viable for low end industrial and appliance applications. FOC (field oriented control) theory facilitates good dynamic control of machine flux and torque in such applications. By Aengus Murray, International Rectifier   All electric motors operate on common [...]

Get More Power from Power-over-Ethernet

Posted on 01 December 2007

       Higher power POE standards are presently being defined This article is a collection of power supply circuits that explain how to draw power from two or more Ethernet ports. An overview of each circuit is provided as well as some of the design issues faced with each implementation. By Brian King and [...]

High-Linearity Analog Optocouplers

Posted on 01 December 2007

      Extend Working Insulation Voltage to 1.4 kV High linearity analog optocouplers provide the versatility required to meet a wide range of analog isolation needs. For designers of high voltage applications, high linearity analog optocouplers can reliably send analog signals across very high voltage area and low voltage area without distortion. By Chen [...]

LTCC Technology for Sensor and RF-Applications

Posted on 01 December 2007

       LTCC-ceramics has small temperature expansion LTCC substrates manufactured to customers’ specifications are utilised in many applications. This paper highlights the specific benefits of "Low Temperature Co-fired Ceramics“ (LTCC) and provides an outlook to future developments. By Dr. Arne Albertsen, Manager Field Application Engineering and Marketing, KOA Europe GmbH   The trends of [...]

Why Constant Current Drives Beat Voltage-Resistor Drives in LED Lighting

Posted on 01 December 2007

       Constant current boost converter improves the energy utilization The design considerations for LED lighting systems powered by 1, 2 or 3-cell battery sources are to say the least numerous: battery energy utilisation, battery life, constant luminous flux output, the light signature (colour temperature), solution size, weight and of course total solution cost. [...]

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 [...]