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Theory of abnormal thyristor forward voltage behavior

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2 Author(s)
Gerstenmaier, Y.C. ; Siemens AG Res. Lab., Munich, Germany ; Pfirsch, F.D.

The on-state current-voltage characteristic of thyristors is investigated by numerical simulation. For sufficiently high p-base concentration-as already known-an abrupt increase in on-state voltage is observed above a critical current density. Driving the device to higher currents results in a reduction of on-state voltage. Similar results are obtained for thyristor profiles with very shallow emitters. An analytic model that explains the described phenomena from first principles and leads to a simple criterion for current limiting in terms of Gummel numbers and carrier mobilities is presented

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Industry Applications, IEEE Transactions on  (Volume:28 ,  Issue: 6 )