Heating circuits

Details Heating circuits Heating circuits

1979-08-08

1981-07-14

Rubinson, Gene Z.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219501, 219212, 219504, H05B 102

Patent

active

042788749

ABSTRACT:
A heating circuit for an electric blanket or the like comprises a cable (1) formed from a heater conductor (2) separated from a sensor conductor (3) by temperature sensitive material (4) and two series resistor-diode pairs (R1-D1 and R2-D2) each connected between ends of the conductors (2, 3) so that each pair conducts in series with the impedance (Z) of the material (4) during respective half-cycles of an AC mains supply, the arrangement being such that general overheating of the cable (1) or localized overheating anywhere along its length reduces the impedance (Z), (possibly to zero if the material (4) melts), such that the current through one or both of the resistors (R1, R2) heats the resistor(s) and blows a thermal fuse (F) to terminate heating. The thermal fuse (F) may be replaced by a resettable interruption element, namely a self-regulating PTC resistive element.

REFERENCES:
patent: 3222497 (1965-12-01), Gordon, Jr.
patent: 3270184 (1966-08-01), Negromarti
patent: 3628093 (1971-12-01), Crowley
patent: 3673380 (1972-06-01), Crowley
patent: 3702435 (1972-11-01), Endo et al.
patent: 3920955 (1975-11-01), Nakata
patent: 4034185 (1977-07-01), Crowley

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