Operation circuit and power switching device employing the...

Details Operation circuit and power switching device employing the... Operation circuit and power switching device employing the...

2005-04-19

2005-04-19

Barrera, Ramon M. (Department: 2832)

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

C361S167000, C361S168100, C361S169100

Reexamination Certificate

active

06882515

ABSTRACT:
In an operation circuit of an electromagnetic switching device, when electric energy is discharged by discharge switches connected in series, respectively, to opening coils and closing coils, an induction current flowing in a direction opposite to a current of the coil of the excitation side is generated. The current flows through the coil on the non-excitation side due to magnetic coupling, and a magnetic flux necessary for driving is cancelled, thereby inhibiting generation of a driving force. The operation circuit includes first and second opening and closing coils, so that a moving element may be driven between those coils. This circuit includes a circuit for suppressing an over-voltage at the moment of interrupting an excitation current of a first coil and for interrupting an induction current generated through the first coil at the time of exciting the second coil.

REFERENCES:
patent: 4086645 (1978-04-01), Gorman et al.
patent: 6024059 (2000-02-01), Kamimaru et al.
patent: 6046423 (2000-04-01), Kishida et al.
patent: 6295191 (2001-09-01), Kishida et al.
patent: 6353376 (2002-03-01), Takeuchi et al.
patent: 2 299 896 (2000-03-01), None
patent: 2001-256868 (2001-09-01), None
patent: 2002-33034 (2002-01-01), None

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