Method and apparatus for controlling power and optimizing power factor in an AC-to-DC converter
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United States of America Patent
Stats
-
Oct 6, 1981
Grant Date -
N/A
app pub date -
Jun 18, 1979
filing date -
Jun 18, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A motor drive system for direct current motors and other similar loads in which the power factor presented to the line by the system remains close to unity for all operating conditions (e.g., all motor speeds). This is accomplished by rectifying an alternating current input voltage and thereafter chopping it to vary power input to the load. An important feature of the invention is the use of a choke at the output of the rectifier of sufficient size to insure that current pulses flowing from the rectifier will be continuous (i.e., will not drop to the zero voltage level) during the sequential ON periods of the rectifier elements.
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