Appeal No. 2000-1938
Application 08/940,467
components. Therefore, the cut-in of the limitation of
the drain voltage UDr to the Zener voltage UZ takes
place not with a pronounced kink, but, depending on the
number of Zener diodes "delayed" in this way, with a
polygonal shape P, and thus [is] more rounded, as
represented by dashes in Fig. 3 at time t3. As a
result, substantially less electromagnetic radiation
interference is released than with the circuit
according to Fig. 1.
Id. at 8, 11. 6-17.
B. The claims
Claim 1, which is representative, reads:
1. A power output stage for switching inductive
loads, comprising:
a switching transistor having a drain, a gate and
a source;
a load having a first end and a second end
connected in series with said drain of said switching
transistor;
a voltage source having a first pole and a second
pole, the first end of the load connected to said first
pole and said source of said switching transistor
connected to said second pole;
a series connected circuit having a blocking diode
and at least one Zener diode connected between the
second end of the load and said gate of said switching
transistor; and
a capacitor connected in parallel with said at
least one Zener diode.
Claims 2-4 specify that the component(s) connected in
parallel with the zener diode is or are a resistor (claim 2), a
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