Device for electronic control of the supply of a heating resistance
Patent 4978838 Issued on December 18, 1990. Estimated Expiration Date: 
November 30, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 30, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesCircuit for controlling glow plug energization Adaptive glow plug controller Toaster Patent #: 4755656 InventorApplicationNo. 443378 filed on 11/30/1989US Classes:219/497, Comprising voltage and/or current measuring and comparing or combining means219/492, Comprising timing or cycling means219/501, Including semiconductor means (e.g., transistor)219/505, Comprising nonlinear or negative temperature coefficient resistance means219/511, With auxiliary heating means for thermal switch means307/117Light, heat, vibratory or radiant energyExaminersPrimary: Paschall, Mark H.Attorney, Agent or FirmInternational ClassH05B 001/02Foreign Application Priority Data1988-12-12 FRAbstractElectronic 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).Field of SearchAutomatic regulating or control meansComprising timing or cycling means Thermally responsive Comprising voltage and/or current measuring and comparing or combining means Including bridge means Including semiconductor means (e.g., transistor) Comprising nonlinear or negative temperature coefficient resistance means With signal or indicating means With auxiliary heating means for thermal switch means Light, heat, vibratory or radiant energy | |
