Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1990-10-29
1991-09-10
Beha, Jr., William H.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
318806, 323207, 363 44, 363 71, 363159, H02M 112, H02M 114
Patent
active
050479091
ABSTRACT:
A power conversion apparatus capable of eliminating inexpedient higher harmonic components from its output, without lowering the conversion efficiency. The apparatus includes a first power converter for converting an input power from a power supply into an output power; a detector for detecting an output current and an output voltage of the first power converter; a high harmonic detector for detecting a higher harmonic component on a basis of the output current and the output voltage, and for producing current reference signal corresponding to the detected higher harmonic component; and a second power converter for producing an inverse of the detected higher harmonic component according to the current reference signal, and combining the produced inverse of the higher harmonic component with the output current of the first power converter such that the higher harmonic component in the output current of the first power converter are cancelled by the inverse of the higher harmonic component.
REFERENCES:
patent: 3825815 (1974-07-01), Gyugyi et al.
patent: 4241395 (1980-12-01), Stacey et al.
patent: 4377780 (1983-03-01), Bjorklund
Beha Jr. William H.
Kabushiki Kaisha Toshiba
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