System and method for protecting a coil structure in a...

Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Including compensation for thermal change of electromagnetic...

Reexamination Certificate

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Reexamination Certificate

active

07995320

ABSTRACT:
A system and method for protecting a coil structure in a controlled switch. In one embodiment, the invention relates to a circuit including at least one load switch connectable between a power source and a load and at least one auxiliary switch, each switch actuable between a default position and a switched position, a coil structure configured to actuate the at least one load switch and at least one auxiliary switch in response to a control input, the coil structure switchable between an actuating configuration for actuating the at least one load switch and the at least one auxiliary switch from the default position, and a holding configuration for holding the at least one load switch and the at least one auxiliary switch in the switched position, and a resettable current limiting device configured to limit the current flow in the actuating configuration of the coil structure if the current flow exceeds a threshold for a predetermined period of time, wherein the at least one auxiliary switch is configured to switch the coil structure from the actuating configuration to the holding configuration.

REFERENCES:
patent: 3297912 (1967-01-01), Scheppe
patent: 3761730 (1973-09-01), Wright
patent: 5181155 (1993-01-01), Beg et al.
patent: 5420379 (1995-05-01), Zank et al.
patent: 5471035 (1995-11-01), Holmes
patent: 5530613 (1996-06-01), Bauer et al.
patent: 2005/0024174 (2005-02-01), Kolb et al.
International Search Report for Application No. PCT/US07/085026 filed Nov. 16, 2007, dated Apr. 15, 2008, mailed May 20, 2008, 2 pages.
Written Opinion for Application No. PCT/US07/085026 filed Nov. 16, 2007, dated Apr. 15, 2008, mailed May 20, 2008, 5 pages.

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