Appeal No. 2000-0131
Application No. 08/800,972
16-20, 24-29, and 31 is before us on appeal. The appeal is
dismissed as to claims 30 and 32.
The claimed invention relates to a bidirectional battery
disconnect MOSFET switch which functions to block voltage in either
direction when open and to conduct current in either direction when
closed. The disconnect switch includes circuitry, referred to as a
“body bias generator”, which assures that the body of the MOSFET is
shorted to whichever of the source/drain terminals of the MOSFET is
biased at a lower voltage.
Claim 16 is illustrative of the invention and reads as
follows:
16. An arrangement comprising:
a battery;
a first MOSFET having a drain terminal, a source terminal, a
body and a first gate, said drain terminal being connected to a
negative terminal of said battery, said first MOSFET further
comprising a first intrinsic diode between said body and said
source terminal and a second intrinsic diode between said body and
said drain terminal;
a body bias generator connected to said drain terminal and
said source terminal of said first MOSFET, said body bias generator
biasing said body of said first MOSFET to the lower of a drain
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