Electromagnetic apparatus drive apparatus

Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...

Reexamination Certificate

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C361S152000, C361S153000

Reexamination Certificate

active

07042692

ABSTRACT:
Conventionally, a non-conductive period is provided in a region in the vicinity of zero of an AC power voltage via a voltage detection circuit14to turn off reliably. The FET17maintains the ON state within several switching cycles after the non-conductive interval to rapidly restore the magnetizing coil current, so that the magnetizing coil current rapidly increases. An object is to suppress beat noise in the electromagnetic device. Within a prescribed interval following the non-conductive interval, a partial voltage at a resistor19of an output V2of a mono-stable circuit20is added as a bias voltage to a detection voltage of a magnetizing coil current at a resistor18,and is detected by the IC11.The IC11drives a FET17with a constant switching period after the non-conductive interval, thereby preventing the increase in the magnetizing coil current and resolving the problem.

REFERENCES:
patent: 4729056 (1988-03-01), Edwards et al.
patent: H3-20406 (1991-02-01), None
patent: H3-283606 (1991-12-01), None
patent: H5-284737 (1993-10-01), None
patent: H6-61043 (1994-03-01), None
patent: 2626147 (1997-04-01), None
patent: 2001-275342 (2001-10-01), None

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