ARC LOAD AC CONTROLLER Russian patent published in 2022 - IPC H02M5/257 H02J3/01 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering, mainly to powerful semiconductor AC controllers intended for use in power supply systems for electric arc loads, such as, for example, plasma torches. The arc load alternating current controller consists of back-to-back thyristors connected in series, an electric reactor and an active filter in the form of a transistor width-modulated converter connected in parallel with the load and absorbing higher harmonics so that a sinusoidal continuous current enters the load. At the same time, an active filter-compensating device is connected to the AC busbars, consisting of an active filter in the form of a transistorized width-modulated converter and a capacitor bank connected in parallel, and providing compensation for the reactive power consumed by the load and filtering higher voltage harmonics arising from for the distorting action of the non-sinusoidal current of the regulator.

EFFECT: reducing the rate of rise of the plasma torch current to the required value and the corresponding suppression of higher harmonics in the plasma torch current.

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