Electric heating – Heating devices – With power supply and voltage or current regulation or...
Reexamination Certificate
2006-08-30
2009-02-03
Paschall, Mark H (Department: 3742)
Electric heating
Heating devices
With power supply and voltage or current regulation or...
C219S511000, C219S517000, C219S501000
Reexamination Certificate
active
07485832
ABSTRACT:
A method and a circuit for preventing over-heat of heat-generating device which are provided with a trigger circuit and a microprocessor on a heater circuit. And the trigger circuit is connected with a power source and a heat-generating device for heating the heat-generating device. The above-mentioned heater circuit is connected with a thermo fuse, a resistor and a reactive trigger circuit. Another end of the reactive trigger circuit is connected with the microprocessor for advancedly detecting whether the microprocessor is in abnormal condition. Once the microprocessor is damaged, the power source, the thermo fuse and the resistor make a loop and the resistor is heated to ruin the thermo fuse for terminating heating. Also, when the microprocessor works normally, the heater circuit and a switch for controlling temperature on reactive trigger circuit are detected to determine whether to terminate the heater circuit.
REFERENCES:
patent: 3924214 (1975-12-01), Plasko
patent: 5618460 (1997-04-01), Fowler et al.
patent: 5729456 (1998-03-01), Boisvert et al.
patent: 6229121 (2001-05-01), Jang et al.
patent: 6462318 (2002-10-01), Furuuchi et al.
Paschall Mark H
Troxell Law Office PLLC
LandOfFree
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