Control circuit arrangement for a portable electrically heated h

Details Control circuit arrangement for a portable electrically heated h Control circuit arrangement for a portable electrically heated h

1975-06-04

1978-04-18

Bartis, A.

Electric heating

Heating devices

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

34 48, 34 97, 219370, 219501, H05B 102, A45D 2008, F24H 304

Patent

active

040853098

ABSTRACT:
An airstream is established and flows about a resistance heater element in an electrical appliance. The heater element is energized by a cyclical potential. A temperature control circuit is provided which includes a switch connected in series with a heat sensor for applying the cyclical potential to the heater. A half-wave rectifier in the control circuit is electrically connected in series with the switch and across the heat sensor. Energization of the heater heats the airstream to an operating temperature T.sub.1. The heat sensor is operable to detect an undesired increase in temperature above a safe limit temperature T.sub.2 which is greater than T.sub.1. At a temperature greater than T.sub.2 the heat sensor automatically opens the series circuit to interrupt energization of the heater. During the open circuit condition of the heat sensor the half-wave rectifier is operable for applying half-cycles of the cyclical potential to the heater. The half-cycle energization of the heater heats the airstream at a reduced operating temperature T.sub.0 which is less than the operating temperature T.sub.1.

REFERENCES:
patent: 3426441 (1969-02-01), Broski
patent: 3497675 (1970-02-01), Yoshiike et al.
patent: 3610881 (1971-10-01), Stewart
patent: 3681569 (1972-08-01), Schwarz
patent: 3708650 (1973-01-01), Smillie et al.
patent: 3731057 (1973-05-01), Kunz et al.

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