EPE Journal Volume 04-2 
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EPE Journal Volume 04-2 - Editorial
EPE Journal Volume 04-2 - Papers



 EPE Journal Volume 04-2 - Editorial 

News from Hanover  [Details]
By B. Sneyers

The Editorial of the EPE Journal Volume 04 N°2, "News from Hanover", written by Ir. Brigitte Sneyers, the Editor of EPE Association.


 EPE Journal Volume 04-2 - Papers 

High Voltage DC Power Supplies  [Details]
By J. S. Bekink; A. J. J. Colijn

Three high frequency transmitters are part of the HERA particle accelerator of the "Deutsches Elektronen Synchrotron" DESY research institute in Hamburg, Germany. For energizing these high frequency transmitters, Holec built three 80 kV 38 A thyristor controlled dc power supplies. Each power supply is connected to the corresponding transmitter via a double shielded coax dc cable, havig a length of 2.6 km.

A PWM-Rectifier without current measurement  [Details]
By J. Ollila

A control scheme for the voltage-sourced PWM-rectifier based on space vector equations is introduced. The main advantages of this new control strategy is that almost sinusoidal line currents are achieved even in dynamical state without current measurement at all. Conventionally, chokes are connected between mains and converter bridge of the pulse width modulated (PWM) rectifier. In this paper a new LCL-type line filter strategy is introduced to further reduce the line current distortion and the cost of the equipment. Despite that the number of components is increased, the total reactance of an LCL-filter can be made much smaller compared with the conventional line filter. In addition to simulations, the new control scheme and filter was also tested with a prototype, the output power limits of which are +/- 100 kW.

Multikilowatt self-oscillating DC-DC converters based on switches with MOS-input  [Details]
By P. C. Theron; J. D. van Wyk; J. A. Ferreira

Recent technologies provides voltage controlled power electronic switches which require very low drive power. This advantage can be used to improve power electronic converters due to reduced losses in the drive circuits, as well as a low number of components. Using these advantages in self-oscallating power inverters will enhance simplicity and efficiency. Two families of self-oscallating MOS-based converters, namely the linear and the nonlinear versions, are distinguished. With the linear version, no core material is saturated, which enables a very high switching frequency. With the nonlinear version, a large regenerative turn-off snubber capacitor is connected in parallel with each of the semiconductor switches to achieve zero voltage switching. The latter improves the performance of the converter regarding the switching losses and EMI, and is suitable for the use of IGBTs and MCTs at very high power levels. This study includes the use of MOSFETs and IGBTs in self-oscallating DC-DC conveters at power levels of several kilowatts.

The Technique of Intelligent Modules  [Details]
By G. Schulze

Intelligent modules shall offer the possibility to simplify circuits of power converter technology. This paper deals with the system components of the control and power part, followed by information on mounting technology including temperature conditions inside the modules and on electromagnetic compatibility (EMC). In the end, you will find a comment on further steps in this direction.

Thermal Characterization of MOS-Controlled Devices in Transient Conditions: Verification of Thermosensitive Parameters by Experimental and Simulation Tools  [Details]
By E. Farjah; C. Schaeffer; L.L. Rouve; R. Perret

The aim of this paper is to study the thermal behaviour of MOS-controlled devices. This study is essentially over the temperature evolution due to internal dissipations. First a brief introduction to the temperature measurement methods applied to power electronics is given. Then different Electrical ThermoSensitive Parameters (ETSP) are compared. In order to create the controlled power dissipation in the component a special power pulse generator has been designed. This test generator creates different test pulses (single pulse or train of pulses) with varying duration, amplitude and forms (step and sinusoidal pulses). The definition of junction temperature for large area chips is quite different from the small size ones so the best method adapted for maximum temperature detection is presented and a thermal model based on the finite element principle for predicting the junction temperature is developed and examined.

Three Level IGBT Inverters for Industrial Drives and Traction Applications  [Details]
By Y. Tadros; S. Salama; T. Schütze

The advantage of application of IGBTs in PWM-inverters in industrial motor drives with three-phase voltage of 400 V and medium power range are well known. To extend the application to industrial motor drives with three-phase voltage of 690 V and to local traffic with dc-line voltage of 600/750 V three level IGBT inverters present a good solution. In this paper some details regarding the realization of the power circuit and the pulse pattern generator with space vector modulation are explained. Three level IGBT inverters are now successfully applied in drives for modern low floor trams. The advantageous performance of these inverters will be illustrated.