PTC heating device having selectively variable temperature level

Details PTC heating device having selectively variable temperature level PTC heating device having selectively variable temperature level

1977-04-08

1979-04-24

Bartis, A.

Electric heating

Heating devices

With current connection and/or disconnection means

19222, 219241, 219446, 219486, 219505, 338 22R, 338201, 338325, H05B 112, H05B 324, H01C 114, H01C 702

Patent

active

041514017

ABSTRACT:
A controllable electric heating device uses a PTC resistance body having first areal electrode on one surface and two spaced apart areal electrodes of different areal size on the opposite surface in overlapping relation with a part of the first electrode to provide at least two current paths through the resistance body between the opposite surfaces. The first electrode is connected to one terminal of a voltage source. A switching device selectively connects one or more of the two spaced apart electrodes to the other terminal of the voltage source so that the effective electrode areas are altered thereby adjusting the current flow in the PTC body to produce different temperature levels of the heating device.

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patent: 2075733 (1937-03-01), Lazarus
patent: 2392712 (1946-01-01), Woodman
patent: 2590944 (1952-04-01), Cowdrey et al.
patent: 2966646 (1960-12-01), Baasch
patent: 3400250 (1968-09-01), Buiting et al.
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patent: 3845442 (1974-10-01), Ihaya et al.
patent: 3858144 (1974-12-01), Bedard et al.
patent: 3953711 (1976-04-01), Eck et al.
patent: 4031499 (1977-06-01), Brueckner

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