Circuit for the infinite direct or indirect variation of the dir

Details Circuit for the infinite direct or indirect variation of the dir Circuit for the infinite direct or indirect variation of the dir

1998-03-12

1999-08-03

Riley, Shawn

Electrical transmission or interconnection systems

Plural load circuit systems

Plural sources of supply

H02J 302

Patent

active

059329343

ABSTRACT:
A circuit for continuously directly or indirectly varying a combination of direct and alternating current flowing through a load supplied with a combination of direct and alternating voltage from a public utility mains, has a low-pass filter that serves for achieving a continuously flowing input current I.sub.in, a coil that is connected in series with the load or is inherently contained in the load, a first alternating current switch that is connected parallel to the load and to the coil, a second alternating current switch connected in series with the load that can be driven with a higher switching frequency compared to the network frequency f.sub.network, and a regulator for the direct or indirect regulation of the direct and/or alternating current I.sub.load flowing through the load. The regulator has an acquisition part for the direct and/or indirect acquisition of the actual direct and/or alternating current I.sub.load,actual flowing through the load, a reference value input part for the direct or indirect input of the reference value of the direct and/or alternating current I.sub.load,ref. flowing through the load, and a drive part that switches the second alternating current switch on and off with a switching frequency suitable for generating the reference direct and/or alternating current I.sub.load,ref. and with a suitable pulse-duty ratio .tau. A combination of a direct and an indirect acquisition leads to an acquisition of the power P.sub.load.

REFERENCES:
patent: 5631814 (1997-05-01), Zak

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