Circuit for compensating harmonic currents in an electric consumer arrangement
AssigneeSiemens Aktiengesellschaft
InventorMichael Becker
Life of this patent
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Abstract
To improve the effect of a filter circuit for the harmonics, which contains an L-C-R series resonant circuit in at least one loop, a variable supplementary current excitation which compensates the residual harmonic current in the consumer arrangement at least approximately, is coupled into the series resonant circuit, the supplementary current excitation preferably being supplied by a compensation transformer which is controlled by the current in the loop, the compensation transformer being excited by a source and controlled by an auxiliary transformer arranged in the loop.
Claims2
A circuit for compensating harmonic currents in a direct current electric supply for a consumer having at least one filter circuit for a harmonic which is connected in parallel to the load and which comprises, in at least one loop, an L-C-R series resonant circuit and a compensation transformer for providing inductively counter-coupled, controller supplementary current excitation and means responsive to the current in the loop for controlling the current in the transducer so as to reduce the harmonic voltage supplied to the consumer to a small value.
Dependencies are inferred from the claim text.