Semikron, Gesellschaft Fur Gleichrichterbau

Siemens Aktiengesellschaft & Semikron Gmbh

Winfried Schierz

Ernst Hebenstreit

Leo Lorenz

Heinz Amann

A discretely constructed MOSFET is switched by a voltage applied between gate terminal and source terminal. The source terminal has a self-inductance in which a fast change of the load current induces a considerable voltage which opposes the applied gate-source bias. This opposing voltage is reduced since the source contact is connected to an auxiliary terminal which is largely magnetically decoupled from the source terminal. A control voltage is applied between gate terminal and auxiliary terminal. When a plurality of MOSFETs are connected in parallel, oscillations in the control circuit can thus be effectively suppressed.

Semiconductor component having at least one power MOSFET

A semiconductor device element, switchable and stable against alternating loads, is provided as an intermediate product which can be stored, can be applied universally, has a semiconductor wafer disposed between two annular insulating bodies and is stabilized on its surface. The semiconductor wafer is connected on two sides via soldering to a contact piece of molybdenum. The contact pieces are provided on their outer surface in each case with a metallization for providing pressure contacting. The semiconductor wafer is covered with a protecting, that is, passivating and stabilizing, covering in the edge zone up to the jacket face of the contact pieces. The edge zone of the semiconductor is immersed in an additional surface stabilizing material in the edge zone between the insulating bodies. The adhesive properties of the surface stabilizing substance mutually connect the insulating bodies and the semiconductor wafer. The contact pieces and the insulating bodies form a sealed enclosure of the semiconductor wafer, and the control electrode of the semiconductor is pressure contacted by a control current conductor held in one of the insulating bodies, which control electrode is formed as a leaf spring.

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Heideck, Germany

Winfried Schierz