Protective control arrangement for duty cycle controlled sheathe

Details Protective control arrangement for duty cycle controlled sheathe Protective control arrangement for duty cycle controlled sheathe

1982-01-07

1984-08-14

Paschall, M. H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219483, 219508, 361 8, 361 42, 307134, H05B 102

Patent

active

044659245

ABSTRACT:
A protective control arrangement for an apparatus incorporating one or more heating units of the type comprising the concentric assembly of a resistive heating element embedded in an insulating material enclosed within a metallic sheath energized in accordance with a duty cycle power control scheme, which prevents the rupture or separation in the sheath caused by an arc at a discontinuity in the heating element from propagating along a substantial portion of the sheath.
In one embodiment, a microprocessor controlled relay associated with each heating element selectively couples and decouples its associated heating element and the power supply. The microprocessor is preprogrammed to control the duty cycle of each heating element by periodically opening the associated relay switch, thereby decoupling the heating element from the power supply for idle periods of predetermined duration. A timer monitors the time between power decouplings. Whenever the time between power decouplings for any heating element exceeds a predetermined maximum time, the microprocessor decouples power from the heating element for a predetermined recovery period. The maximum time is selected so as to confine the propagation time within a predetermined limit.

REFERENCES:
patent: 2094480 (1937-09-01), Vogel
patent: 3592771 (1971-07-01), Vedder et al.
patent: 4044224 (1977-08-01), Jenkins et al.
patent: 4054857 (1977-10-01), Bowling
patent: 4296449 (1981-10-01), Eichelberger
patent: 4370692 (1983-01-01), Wellman et al.

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