Appeal No. 1997-0600
Application 08/291,207
wherein a path of an OFF driving current,
which said control circuit supplies to said
control electrode to bring said power
switching element to said OFF operation,
includes said inductor; said off driving
current flowing in the opposite direction
as said main current of said power
switching element in said inductor; and
wherein a path of an ON driving current,
with said control circuit supplies to said
control electrode to bring said power
switching element to said ON operation,
excludes said inductor.
Turning to figure 1, we see that these paths are
represented by a solid line and a dotted line, respectively.
We also note that these paths are due to the fact that the
inductor is not simply connected to the emitter and ground
without any other connections, but instead include an
additional connection to the emitter which connects the pulse
generator 1.
Turning to Kuroki, we note that Kuroki teaches
simply connecting the inductor 5 between the emitter and
ground. Kuroki does not teach these additional connections
which would establish alternate paths depending on whether the
power switch is on or off. Therefore, we find that Kuroki
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