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The mechanism of hot spot formation in transistors is examined from both experimental and theoretical viewpoints. It is shown that after the device becomes thermally unstable the device may restabilize in a hot spot mode of operation. The IC, VCE thermal instability locus can accurately be predicted assuming the current density is uniform prior to hot spot formation. A new model is proposed which...
The phase controlled thyristor converter supplied from a weak power system is modeled in the time domain. A state variable formulation is used for the discrete nonlinear model. Local linerization is performed about an equilibrium state to obtain a small signal steady state model for such a thyristor converter system. The stability constraints for the digital controller parameters are also obtained...
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