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The switching actions of power semiconductors cause unwanted electromagnetic emissions of switched-mode power supplies. The dv/dt- and di/dt-values of the voltage and current slopes at the semiconductors as the origin of disturbances can be reduced using resonant or soft-switching techniques which may represent an extra effort concerning the design of the power supply. The consideration and optimization...
Leakage inductances of transformers significantly influence the behavior of power electronic circuits. This paper deals with their prediction: The application of the approximation method of Lebedev for the calculation of leakage inductance of core-type transformers as well as an extension of this method for pie winding arrangements are presented. Design aspects influencing leakage inductance are additionally...
The switching actions of power semiconductors cause unwanted electromagnetic emissions of power electronic apparatuses. In the paper, influencing aspects e.g. asymmetry of coupling paths, realization of chip-to-ground isolation and switching characteristics of the applied power semiconductors shall be discussed.
The feasibility to predict the leakage inductance of transformers is important in many power electronic applications. In the paper, approximate calculation methods and a prediction of leakage inductance based on finite elements method (FEM) simulation are considered by the example of pulsed power transformers for capacitor discharge welding arrangements. The effects of the use of transformers with...
Resistance welding is a joining process using high welding currents. These currents cause high magnetic fields in the surrounding of welding equipment. Considering the present discussion about national adaptations of the EU directive on electromagnetic fields, in the paper questions of assessment of the exposure to magnetic fields will be discussed, particularly with regard to low frequency-fields.
Resulting from high welding currents, resistance welding is accompanied by intense magnetic fields. In the paper, the interaction between the magnetic fields of the welding circuit of a resistance welding machine and two compensation coils, which are connected in series to the primary winding of the welding transformer, is illustrated. Different field compensation arrangements are investigated by...
Resistance welding is commonly used in many branches of industry. To perform the welding process high welding currents up to about 100 kA are required which are supplied by dedicated power electronic converters in pulsed power operation. Concerning electromagnetic compatibility (EMC) aspects of such equipment the new European standard EN 50240 has to be taken into account. In the paper adapted noise...
Resulting from the connection between the change rate of a magnetic field and the induced currents in an exposed human body, pulsating magnetic fields have to be evaluated analysing the waveforms of the field or the field-generating current A corresponding assessment guideline is given in the German safety regulation on "Electromagnetic Fields" BGV Bll. Considering the specific output current...
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