EPE Journal Volume 08-1/2 
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EPE Journal Volume 08-1/2 - Editorial
EPE Journal Volume 08-1/2 - Papers



 EPE Journal Volume 08-1/2 - Editorial 

New EPE chairman's comments in advance of EPE'99  [Details]
By R. Bassett

The Editorial of the EPE Journal Volume 08 N°1/2, "New EPE chairman's comments in advance of EPE'99", written by Dr. Roger Bassett, the President of EPE Association.


 EPE Journal Volume 08-1/2 - Papers 

Effects of External Operating Conditions on the Reverse Recovery Behaviour of Fast Power Diodes  [Details]
By N. Y. A. Shammas; M. T. Rahimo; P. T. Hoban

In this paper, both experimental and simulation results, showing the effects of junction temperature, forward current and the rate of fall of forward current, or commutating di/dt on the reverse recovery behaviour of modern fast power diodes are presented. The main parameters used to characterise the reverse recovery performance of a semiconductor diode, are the reverse recovery change, peak recovery current and reverse recovery time. The diode snappiness phenomenon due to a current chop-off during reverse recovery, was also investigated and linked with the above parameters.

A New Concept of IGBT Packaging  [Details]
By L. Meysenc; S. Raël; C. Schaeffer; A. Bricard

The advent of high power density components has required investigation of innovative techniques for removing heat from this devices. With regard to power electronics fields, the definition of the current calibre is directly linked to its thermal environment. One of the aims of this work is to demonstrate that we can use an IGBT with on state current and losses higher than the values given by the manufacturers. We have opted for placing circular channels under an IGBT chip because this solution presents good performances and is easily realisable. In a first time, we analyse the thermal behaviour of this setup, and give the governing laws. Then, we simulate the setup on a finite elements program in order to quantify the temperature drop due to the conduction. Finally, we compare these results with measurements realised on the previous described setup. During the measurements, we determine the junction temperature with a thermal sensitive parameter, and in a second time, it will be obtained with an infra red camera.

New Family of ZVS QRC and MRC with PWM Control Based on Magnetic Elements Modification  [Details]
By A. M. Pernía; J. M. Lopera; M. J. Prieto; F. Nuño

ZVS Multi-resonant and quasi-resonant converters have been modified to provide constant-frequency operation. Transformer leakage inductance has been used to adapt the traditional PWM control to these converters increasing their efficiency. Conventional PWM integrated circuits can be used for the converter regulation. Several experimental results are developed to test the control method proposed.

Closed Loop Control of a Stepping Motor Drive - Comparison between PID Control, Self-Tuning Regulation and Fuzzy Logic Control  [Details]
By F. Bétin; M. Deloizy; C. Goeldel

Originally, stepping motors were mainly used for simple point-to-point positioning tasks. Nowadays, thanks to advances made in power electronics and in data processing, they are widely used in robotics and in numerical control of machines where they have to perform high-precision synchronized movements. But the variations of the mechanical configuration of the drive which are common for these two applications can lead to step losses. Moreover an open loop speed control is insufficient and a closed loop control is required. This paper presents the application of three different methods of speed control for a stepping motor drive: A PID control (PID), an adaptive control by self-tuning regulators (STR) and a fuzzy logic control (FLC). Simulation is used to compare the performance (tracking and regulation capacities, robustness) of these three controllers with two classical trapezoidal profiles; the Fuzzy Logic Controller seems to be the best regulator for our application. Therefore, this controller has been implemented using the INTEL 80C196Kc microcontroller. Simulation results are validated experimentally.

Network Representation of AC Machines Models for Converter-Machine Systems Simulation  [Details]
By M. Ronkowski; R. Szczesny

A novel representation of a.c. machine models in terms of multiport networks have been presented. These networks are based on the lumped-parameter models and are derived for the two basic a.c. machine structures, i.e. the smooth air-gap structure, and the salient-pole structure. The models feature the same number of terminals as the real machines that complies with requirements for modelling and simulation of power electronic converter-electrical machine systems. In particular, these models eliminate a general difficulty encountered in the automatic formulation of the conventional two-axis a.c. machine model terminal-constraints, imposed by the operations of converter-machine units at normal and/or fault modes. Other important feature is the direct implementation of the stable numerical integration algorithm, based on the associated discrete circuit models of reactive network elements. To enhance the models accuracy, electromagnetic non-linearity effects are introduced properly through developed saturation factors which consider the mutual-axis saturation dependance. Finally, it should be noted that the presented models are amenable to incorporation in computer-aided power electronic systems design packages and in general-purpose simulators, such as PSpice and SABER. The properties of the presented models have been verified for different converter-machine systems on the field. As an illustrative example, simulation and measurement results for the laboratory induction motor drive system with a squariwave VSI in the stator and for the industrial induction motor drive system with converter cascade in the rotor have been presented.

A Bi-Directional Rectifier for use with a Voltage Fed Inverter in a High Performance Variable Speed AC Motor Drive System  [Details]
By P. W. Wheeler; J. C. Clare; M. Sumner

This paper describes the design, construction and operation of a novel bi-directional rectifier for use with inverter circuits in variable speed AC drives. The circuit consists of a controllable three-phase thyristor bridge and a reconfigurable DC to DC converter, operating under average current mode control. The rectifier is used with a vector controlled inverter drive to demonstrate the capabilities of the system. Simulation and practical results are presented.

Piezoelectric Motor fed by a PLL-Controlled Series Resonant Converter  [Details]
By H. van den Broeck; U. Schaaf

A PLL-controlled resonant converter for piezoelectric motor supply is presented which automatically matches its output-frequency with the resonant frequency of the motor. The motor speed can be set either by controlling the phase shift between voltage and current or by controlling the amplitude of the voltage by PWM.