Appeal No. 96-2551
Application 08/037,767
includes a pulse transformer having a primary winding
and a secondary winding across which positive and
negative secondary pulses are developed when positive
and negative input pulses are provided to the primary
winding following a particular time, means coupled to
the secondary winding for rectifying the secondary
pulses, first and second series-connected capacitors
connected to the rectifying means and first and second
controlled switches each having a control electrode
coupled to the secondary winding of the transformer and
main current path electrodes coupled between the
capacitors and a control electrode of the power
transistor, the improvement comprising:
means coupled to the first capacitor and operable
before the particular time for precharging the first
capacitor including a third controlled switch coupled
between the power source and the first capacitor; and
means coupled between the power transistor and the
third controlled switch for detecting an overcurrent
condition in the power transistor wherein the third
controlled switch is responsive to such overcurrent
detection to turn off the power transistor.
The examiner reads the limitations of claim 10, which is the
broader of the two claims, on Landseadel as follows:
(a) "transformer" - transformer 26;
(b) "rectifying means" - rectifier circuit 36;
(c) "capacitor" - capacitors 46 and/or 48;
(d) "controlled switch" - MOSFET 14 or 22;
(e) "means for precharging" - resistor 54.
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Last modified: November 3, 2007