Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Reexamination Certificate
2007-01-02
2007-01-02
Vu, Bao Q. (Department: 2838)
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
C361S152000, C123S490000
Reexamination Certificate
active
11073432
ABSTRACT:
The invention relates to a method and an apparatus for regulating a current through an inductive load, which can be connected to a power supply, to a prescribed nominal current value, where the method comprises the following method steps:a) turning on and off the power supply in pulsed fashion, with the power supply being turned on when the current (I) flowing through the load (L) reaches a first limit value (I—1), which is below the nominal current value (I_nominal) by a hysteresis value (H), and with the power supply being turned off when the current (I) reaches a second limit value (I—2), which is above the nominal current value (I_nominal) by the hysteresis value (H),b) determining a period duration between two successive turn-on or turn-off times,c) comprising determined the period duration with a given period duration (Tnominal), andd) changing the hysteresis value (H) on the basis of the comparison between the determined period duration and the prescribed period duration (Tnominal).
REFERENCES:
patent: 4585986 (1986-04-01), Dyer
patent: 4944281 (1990-07-01), Suquet
patent: 5038247 (1991-08-01), Kelley et al.
patent: 5708578 (1998-01-01), Stoddard et al.
Maginot Moore & Beck
Vu Bao Q.
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