Multizone electrical furnace methods and apparatus

Details Multizone electrical furnace methods and apparatus Multizone electrical furnace methods and apparatus

1975-05-06

1977-03-08

Miller, J D

Electric heating

Heating devices

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

13 24, 219483, H05B 102

Patent

active

040114309

ABSTRACT:
In a multizone electrical furnace the phase shift effect of the thyristor devices used to control the power supplied to each thermal zone is reduced by providing two or more heater circuits, each including a thyristor device and a heating element, for each thermal zone. The thyristor devices are controlled so that only one thyristor device associated with each thermal zone is operating to produce a substantial phase shift at any time. Over-powering the heating elements at higher furnace temperatures may also be prevented by connected two or more heating elements associated with a thermal zone to one of the thyristor devices associated with that zone above a predetermined threshold temperature.

REFERENCES:
patent: 2282226 (1942-05-01), Hoop
patent: 2719799 (1955-10-01), Christian
patent: 2952722 (1960-09-01), Jackson
patent: 3560712 (1971-02-01), Touhill
patent: 3736360 (1973-05-01), Bergman et al.
patent: 3855452 (1974-12-01), Flasza

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