Apparatus for controlling the power of an AC voltage supplying an electrical consumer by phase control and method for reducing harmonics
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United States of America Patent
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Jul 8, 2008
Grant Date -
Sep 1, 2005
app pub date -
Feb 9, 2005
filing date -
Aug 14, 2002
priority date (Note) -
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Abstract
An apparatus for controlling the power of an AC voltage supplying an electrical consumer (14) by phase control and for reducing harmonics caused by said phase control, particularly within a range of 4 kHz, preferably within a range of the third harmonic, comprising a first switching element (12) (TRIAC) connected in series with the consumer (14) and driven by a control device (20) for performing a phase control. A second switching element (34) connected in series with a resistor element (32) is provided in parallel to the first switching element (12). The control device (20) is adapted to drive the second switching element (34) shortly before the first switching element (12) into its conducting state for a short time period.
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