Method and arrangement for controlling the output of a load connected to an ac line voltage
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United States of America Patent
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-
Sep 21, 1999
Grant Date -
N/A
app pub date -
Jul 14, 1997
filing date -
Feb 14, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and arrangement for controlling the output of electrical consumers connected to ac line voltage, especially of electric motors and the like, in which the output is changed by changing the phase control of the electric alternating magnitude supplied to the consumer. The extent of the firing angle determining the extent of the phase control is varied toward larger or smaller values around the given reference value of the firing angle, which reference value corresponds to the desired power consumption, so that asymmetry of the firing angle is produced with respect to time between two successive full waves, whereby odd-numbered harmonics are sharply reduced as even-numbered harmonics slowly increase.
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