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The characteristics of pulse thyristors, which are viable for safe switching-on in series connection, are being discussed. The influence of turn-on delay distribution for thyristors in stack generated by overvoltages is being evaluated, including the «convergence» effect of turn-on delay distribution in series connection. There is shown suitability of new thyristor stacks for high current pulses commutation.
The following aspects of using irradiation with accelerated protons, which have initial energy over 10 MeV, for production of high voltage freewheeling diodes are being described: generation of uneven lifetime distribution inside the semiconductor element; implementation of the hidden, induced with implanted hydrogen n'-layers into the semiconductor element. It is shown that there is a possibility...
Conjunction of silicon crystals with surface over 10 cm² with molybdenum discs by means of silver paste sintering is being discussed. It is shown that to ensure strength of joint and low thermomechanical stress selection of dependencies of pressure and temperature on time is very important. It is necessary to ensure thermal stability of multilayer metal process on jointed surfaces. Experimental elements...
There is a new way of increasing the softness of reverse recovery (S-factor) of high-voltage p+-p-n−-n′-n+ diode using local reduction of life time in n part of layer adjacent to n+. Experimentally proved the possibility to reach S-factor above 2 for high-voltage diodes (Vbr ∼ 4500–4800V) of such structure with snubberless recovery in circuit with inductive load and roll-off speed more than 1500A/μs.
The paper is devoted to combination of method of moments structure decomposition technique with impedance matrix interpolation method. This approach allows shortening the time of wideband analysis preserving good accuracy of the results comparing to conventional MoM.
In this paper, the improved asymptotic waveform evaluation (AWE) are outlined as the efficient, based on method-of-moments, technique for obtaining broad-band response of the radiators/scatterers. The proposed approach allows to make conventional AWE techniques more effective with respect to time of analysis and memory requirements. The technique consists in fast algorithm for evaluation of impedance...
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