Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1989-11-30
1990-12-18
Paschall, M. H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219505, 219511, 219501, 219492, 307117, H05B 102
Patent
active
049788388
ABSTRACT:
Electronic control device of the electrical supply of a heating resistance (1) adapted to heat a cooking or grilling enclosure (2) such as, for example, the heating enclosure of a toaster. A detector (9) detects the temperature prevailing in the enclosure (2) and is electrically connected to an electronic timing circuit (7) adjustable according t a selected temperature (To) chosen by the user, and is adapted particularly to control the opening of a switch (5) mounted in series with the resistance (1). The detector (9) is mounted outside the enclosure (2) and comprises a variable resistance (10), for example a thermistor, which is in thermal relationship with a calibrated resistance (11), and which is electrically connectd to the timing circuit (7) so as to control this circuit. The thermal characteristics of the detector (9) are such that the timing circuit (7) controls the opening of the switch (5) practically at the instant at which the heating resistance (1) achieves the selected temperature (To).
REFERENCES:
patent: 4516543 (1985-05-01), Abe et al.
patent: 4607153 (1986-08-01), Ang et al.
patent: 4755656 (1988-07-01), Charlesworth et al.
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