Electric heating – Heating devices – With current connection and/or disconnection means
Patent
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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Belhomme Charles J. G.
Van Bokestal Andre M. A.
Bartis A.
Briody Thomas A.
Franzblau Bernard
U.S. Philips Corporation
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