Appeal No. 1997-0600
Application 08/291,207
connected to emitter electrode E of element 6 and ground.
Appellants further disclose that the emitter of element 6 is
also connected to pulse generator 1. Appellants disclose on
pages 11 and 12 that the closed circuit of the OFF driving
current (indicated by a solid arrow in figure 1) formed when
the OFF driving transistor 3b turns on includes inductor 13.
The closed circuit of the ON driving current I (designated by
ON
the dotted arrow in figure 1) formed when the ON
driving transistor 3a turns on does not include inductor 13.
Appellants disclose that this arrangement suppresses the surge
voltage when the element 6 makes transition from ON to OFF
when the surge voltage due to the parasitic inductances 11 and
12 occurs.
Independent claim 10 is reproduced as follows:
10. A power switching device comprising:
a control circuit having an output;
a power switching element having a control electrode
connected to the output of said control circuit and having a
pair of main electrodes; and
an inductor connected to one of said pair of main
electrodes of said power switching element;
3
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