Appeal No. 1997-0211
Application No. 08/252,288
BACKGROUND
The appellant's invention relates to a power conversion system for converting D.C.
to A.C. with reduced harmonics in the A.C. power. The system uses prediction rather than
feedback. An understanding of the invention can be derived from a reading of exemplary
claims 1 (Group 1) and 3 (Group 2), which are reproduced below.
1. An inverter system comprising:
inverting means for inverting input DC power into output AC power
having a fundamental frequency wherein the inverting means produces a
variable width pulse and wherein the variable width pulse has a switching
angle;
predicting means, responsive to the inverting means, for predicting a
first quantity related to a harmonic of the fundamental frequency if the
switching angle is varied, and for predicting a second quantity related to the
harmonic of the fundamental frequency if the switching angle is unvaried;
and,
means, connected to the inverting means and to the predicting
means, for controlling the inverting means so as to vary the switching angle if
the first quantity is closer to a desired level than is the second quantity and
so as not to vary the switching angle if the second quantity is closer to a
desired level than is the first quantity.
3. An inverter system comprising:
inverting means for inverting input DC power into output AC power having
a fundamental frequency wherein the inverting means produces a variable width
pulse, wherein the variable width pulse has a switching angle in a present cycle of
the output AC power, and wherein the inverting means has an inverter signal;
integrating means for integrating, beginning at the switching angle in a
present cycle of the output AC power, a product of the inverter signal and a sine
2
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