Radiant electric heater arrangement

Details Radiant electric heater arrangement Radiant electric heater arrangement

1997-04-10

1999-06-01

Walberg, Teresa

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

219448, 219486, 219492, H05B 368, H05B 302, H05B 102

Patent

active

059085711

ABSTRACT:
A radiant electric heater arrangement is provided for connection to a dual voltage supply which provides a first alternating current supply voltage and a second alternating current supply voltage higher than the first. The arrangement includes a heater having at least one heating element and a manually operable multiple discrete position switch means for manually selecting in sequence a predetermined number of discrete different power settings for the at least one heating element from the voltage supply. The arrangement further includes control means co-operating between the switch means and the supply whereby in each position of a first sequential series of discrete positions of the switch means the at least one heating element is selectively energisable from the first supply voltage in such a way that at least one selected proportion of half cycles in a predetermined number of half cycles of the first supply voltage is or are arranged for application to the at least one heating element, and further whereby in each position of a second sequential series of discrete positions of the switch means, following the first sequential series, the at least one heating element is selectively energisable from the second supply voltage in such a way that at least one selected proportion of half cycles in a predetermined number of half cycles of the second supply voltage is arranged for application to the at least one heating element. In this way a stepwise increase in power output from the heater is obtainable in operation from one position of the switch means to the next through the first and second sequential series of switch positions.

REFERENCES:
patent: 4740664 (1988-04-01), Payne et al.
patent: 4786799 (1988-11-01), Well, Jr. et al.
patent: 5171973 (1992-12-01), Higgins
European Search Report, Jul. 30, 1998.

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