Appeal No. 1998-0398
Application No. 08/284,160
The disclosed invention relates to a power inverter
apparatus for driving either a three-wire, three-phase ac
motor or a three-wire, single-phase ac motor. A controller of
the power inverter controls the switching of switches in the
power inverter according to a sequence that provides high-
speed pulse-width modulation to drive either of the two ac
motors.
Claim 1 is the only independent claim on appeal, and it
reads as follows:
1. Power inverter apparatus for driving either a three-
wire, three-phase ac motor or a three-wire, single-phase ac
motor, comprising:
an input terminal for receiving a predetermined dc
voltage relative to a reference;
first, second and third pairs of electrical switches,
each pair including first and second series-connected switches
connected between the input terminal and the reference, with
the nodes between the first and second switches of the switch
pairs forming first, second and third output terminals;
wherein the first, second and third output terminals are
connectable to the input terminals of either a three-phase ac
motor, having three input terminals and three windings, or a
single-phase ac motor, having three input terminals and two
windings; and
a controller for controllably switching ON and OFF the
switches of the first, second and third pairs of switches
according to a sequence that provides high-speed pulse-width
modulation, such that the apparatus is conditioned to drive
either the three-phase motor or the single-phase motor.
2
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