Temperature measuring circuit for heating and cooking appliances
AssigneeFunai Electric Co., Ltd.
InventorKiyonori Hida
Life of this patent
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Abstract
In a temperature measuring circuit connecting a temperature sensor such as a thermistor to a standard voltage source through tap resistances, detecting a sensed value of the temperature sensor by comparing the voltage of the sensor connecting point with the specified voltage by a comparator, a simplified construction of the circuit makes it possible to detect failures of the temperature sensor such as breakage or burn-out.
Claims7
A temperature measuring circuit for heating and cooking appliances operative at predetermined temperatures, comprising a resistance network comprising a plurality of resistors having different resistance values;
- temperature detecting means exhibiting changes in resistance responsive to temperature variations;
- said temperature detecting means selectively cooperating with one of resistors at each predetermined temperature for generating first control voltage representative of an associated predetermined temperature;
- comparator means for comparing each control voltage with a reference voltage;
- and switching means for switching one of said resistors to cooperate with said temperature detecting means when a preselected relationship is established between said control and reference voltages.
Dependencies are inferred from the claim text.