Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1994-08-24
1996-03-12
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327551, 327362, 327552, 363 95, 307105, H02M 540, G05F 170, H03K 500
Patent
active
054989949
ABSTRACT:
An active filter device simple in construction and low in price in which higher harmonic components can be stably suppressed without requiring a passive filter even when a load to be compensated includes a capacitative load. Such an active filter device includes: a current transformer for detecting a load current; a frequency detection circuit for detecting higher harmonic components contained in the load current; a first three-phase/two-phase conversion circuit for determining a reference compensation current for compensating for the current with respect to a first frequency among the higher harmonic components; a first filter circuit; a first two-phase/three-phase conversion circuit; a first phase compensation circuit; an n-th three-phase/two-phase conversion circuit for determining a reference compensation current for compensating for the current with respect to an n-th frequency; an n-th filter circuit; an n-th two-phase/three-phase conversion circuit; an n-th phase compensation circuit; an adder for synthesizing the respective reference compensation currents with respect to the first frequency and the n-th frequency; an inverter circuit for outputting a resultant compensation current based on the output from the adder; and an inverter transformer.
REFERENCES:
patent: 3825814 (1974-07-01), Pelly
patent: 4812669 (1989-03-01), Takeda et al.
patent: 4835411 (1989-05-01), Takeda
patent: 5077517 (1991-12-01), Tanoue et al.
patent: 5321598 (1994-06-01), Moran
patent: 5384696 (1995-01-01), Moran et al.
Mitsubishi Electric Corporation Technical Report, vol. 62, No. 6, 1988.
Callahan Timothy P.
Le Dinh T.
Mitsubishi Denki & Kabushiki Kaisha
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