EPE Journal Volume 06-2 
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EPE Journal Volume 06-2 - Editorial
EPE Journal Volume 06-2 - Papers



 EPE Journal Volume 06-2 - Editorial 

EPE/PEMC: Steps for a Future in Power Electronics in Europe  [Details]
By P. Ferraris; G. Maggetto

The Editorial of the EPE Journal Volume 06 N°2, "EPE/PEMC: Steps for a Future in Power Electronics in Europe", written by Prof. Paolo Ferraris, the President and Prof. Gaston Maggetto, the Editor in Chief of EPE Association.


 EPE Journal Volume 06-2 - Papers 

How to Evaluate IGBT Losses on Inductive Load from Data Sheet Parameters  [Details]
By F. Profumo; A. Tenconi; G. Griva; S. Facelli

In this paper the validity of a simplified method, based on few easily obtainable parameters, to calculate the IGBT losses in power electronic systems is proposed and analysed. The method has been tested by means of comparison with other methods using more sophisticated models and the results obtained from all the models have been validated by experimental results.

Characterization of a New High Voltage Integrated Switch: M.O.S. - Gated Optically Triggered Thyristor  [Details]
By Y. Patel; J. Jalade; J.-L. Sanchez; R. Berriane; J.-P. Laur; P. Austin

For power applications derived from an industrial supply network, a galvanic insulation is usually required between the power stage and the control circuits. In practice, for high galvanic insulation, it may be difficult to achieve a power device materially seperated from the signal processing part. A good tradeoff consists of associating control detection and amplification circuits and control defect detection circuits with each power switch. In this paper, the performance of a M.O.S.-Gated optically triggered thyristor is presented to illustrate capabilities of new power structures based on the functional integration concept. An application of this device to a resonant converter is also given.

Estimation of the IGBT Silicon Temperature during Short-Circuit Condition in Order to Determine the Failure Mode  [Details]
By F. Calmon; J.-P. Chante; A. Sénès; B. Reymond

Designers in power electronics use IGBT because of its attractive electrical characteristics and its short-circuit withstand capability. Unfortunately, it is very difficult to forecast the IGBT safe operating area in short-circuit conditions (short duration and large power) because the thermal response curves obtained with the classical thermal model are not accurate in such conditions. The aim of this paper is to present a study of the device temperature rise during the short-circuit. The values of the silicon temperature inform the user on the possible damage occuring in the device. Furthermore, this can help the user to determine the physical failure mode and to design an appropriate fault protection scheme.

Losses due to Stray Inductance in Switch Mode Converters  [Details]
By M. Fasching

A tutorial paper is presented on the influence of stray inductance of the commutation circuit (Lo) in switch mode converters. After a short explenation of turn-on and turn-off transients the discussion is focused on the dissipation losses of the switch (or clamping circuit) caused by stray inductance (Lo). A simple measurement of Lo is introduced which is based on switching transients. With this method Lo can be calculated with a standard deviation of 4%. Then dissipation losses due to Lo are estimated for a 50 kW buck converter and for a 50 W flyback converter. Due to low inductive circuit layout in non-isolated high power converters the additional losses are less then 5% of the switching losses. However, isolated switch mode power supplies have a stray inductance which is approximately two orders of magnitude higher than in non-isolated converters. This requires clamping-circuits which reduce overvoltage and absorb or feed back energy to the intermediate capacitor. In that case, losses caused by Lo amount 10 ... 20 % of the switching losses.

High Intensity Discharge Lamps Supplied with a Novel Low-loss Clamped-Mode LCC Resonant Inverter  [Details]
By J. M. Alonso; A. J. Calleja; J. Ribas; C. Blanco; M. Rico

A novel clamped-mode LCC resonant inverter with very low losses is presented in this paper. Switching and conduction losses are minimised forcing the inverter to operate with minimum commutations and without handling reactive energy. Output power is controlled via switching frequency and clamped interval is self-adjusted by the resonant current to obtain optimum commutations. In this way, a very simple circuit can be used to control the inverter and the efficiency achieved is very high.

Optimized and Non-Optimized Random Modulation Techniques for VSI Drives  [Details]
By F. Blaabjerg; J. K. Pedersen; L. Oestergaard; R. L. Kirlin; A. M. Trzynadlowski; S. Legowski

Random pulse width modulation techniques are known to reduce acoustical noise and vibrations in inverter fed a.c. drive systems. The randomization can easily be done by varying widths of individual switching intervals. A random modulation strategy can be optimized with respect to a given objective. Four such strategies are described and compared. Harmonic torques in an induction motor, switching losses in the inverter, and the harmonic power in the spectrum of the inverter output voltage are targeted for optimization. Results of experimental investigation are presented for four random strategies and compared with fixed switching frequency operation. The test results show that the random strategies flatten out the power spectra and acoustical spectra. Vibrational tests show a reduction in vibration using random modulated strategies.

Reduction of EMI Emission of an On-Board Charger for Electric Vehicles  [Details]
By G. A. Karvelis; S. N. Manias; A. Nagel; F. Schöpe

This paper presents the Electro-Magnetic Interference (EMI) of a resonant operating on-board battery charger for electric vehicles. The EMI of the two stages (boost converter and DC-DC converter) is analyzed and ways of improvements are shown.