Current to power crossover heater control

Details Current to power crossover heater control Current to power crossover heater control

1991-08-28

1993-02-23

Paschall, Mark H.

Electric heating

Heating devices

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

219501, 219505, 219508, 307117, H05B 102

Patent

active

051892839

ABSTRACT:
A control system which minimizes the start up time of heaters and sustains long term automatic control is provided. This control system automatically converts control time constant current to constant power when the power reaches the power set and provides that after power interruptions, control will revert back to constant current until constant power control is again called for. The heater controlled by the control system of this invention is preferably a subterranean heater having a long heating element.

REFERENCES:
patent: 3413446 (1968-11-01), Rogers
patent: 3826887 (1974-07-01), Pemberton
patent: 4362924 (1982-12-01), Story et al.
patent: 4570715 (1986-02-01), Van Meurs et al.
patent: 4572299 (1986-02-01), Van Egmond et al.
patent: 4616705 (1986-10-01), Stegemeier et al.
patent: 4704514 (1987-11-01), Van Egmond et al.

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