Temperature control system for electric surface heater

H - Electricity – 05 – B

Patent

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Details

CPC

341/32, 309/83

IPC codes

H05B 1/02 (2006.01) G05D 23/19 (2006.01) G05D 23/24 (2006.01) H02H 3/33 (2006.01) H02H 5/04 (2006.01) H05B 3/34 (2006.01)

Type

Patent

Patent number

CA 1132681

Description

ABSTRACT A temperature control system for electric surface heater of piled layers of a heating element across which a commercial AC source current is fed and a thermosensitive electrode opoosing the element through thermosensitive element showing negative impedence characteristics with temperature rise. In the system, an AC signal voltage difrerent from the source current is applied between the heating element and the thermosensitive electrode, and excessive variations in the signal voltage responsive to the negative impedance or the thermosensitive element is detected to disconnect or connect the heating element and the source.

Application Number

335674

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