Apparatus for controlling the power of an AC voltage...

Details Apparatus for controlling the power of an AC voltage... Apparatus for controlling the power of an AC voltage...

2008-07-08

2008-07-08

Laxton, Gary L (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Phase controlled switching using electronic tube or a three...

C363S039000

Reexamination Certificate

active

07397225

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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