Method of and an active filter for reducing a residual ripple of

Details Method of and an active filter for reducing a residual ripple of Method of and an active filter for reducing a residual ripple of

1999-04-14

2000-11-28

Le, Dinh T.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327551, 327311, 363 45, 363 46, H03K 500, H02M 700

Patent

active

061540900

ABSTRACT:
A method of reducing feedback action on a timely flow of current, which is drawn by a load from a network via rectifier, by active filtering of upper harmonics, which are superimposed on a network first harmonic, with a power factor corrector circuit with a pulse-width modulation of a switch signal which influences the current drawn from the network and flowing through a boost-converter, with the method including dividing a current path between the rectifier (2) and the load (10) in a plurality of parallel channels (It, Jt), and providing in each channel (It, Jt) a similarly active filter, with switch signals of both active filters having a substantially same pulse-width modulation and being phase-sifted relative to each other so that a reduced ripple of the total current, which results form cumulative superimposition of currents in separate channels, is produced at a network input (9); and an active filter for effecting the method.

REFERENCES:
patent: 4384321 (1983-05-01), Rippel
patent: 5278489 (1994-01-01), Bowers
patent: 5844786 (1998-12-01), Yoshida et al.

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