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US 4,480,312 AGranted
Temperature sensor/controller system
OwnerSteven L. Wingateinventor
Life of this patent
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Abstract
A highly accurate electronic temperature sensor/controller system employs one or more sensing devices, a precision voltage reference, a pair of analog multiplexers, a voltage-to-frequency converter, a microcomputer, a keyboard, an output display, and one or more solid state switches.
Claims7
A temperature sensor/controller comprising:
- temperature sensing means having a current output, said temperature sensing means being positioned at a point at which it is desired to measure temperature;
- analog multiplexing means coupled to said temperature sensing means and to a voltage-to-frequency converter means for providing a voltage that is proportional to the current output of said temperature sensing means;
- precision voltage reference means for providing as an output a substantially temperature insensitive source of reference voltage;
- said voltage-to-frequency converter means being further coupled to said precision voltage reference means for alternately providing a first output signal whose frequency is proportional to the current output of said temperature sensing means and a second output signal whose frequency is proportional to the output of said precision voltage reference means;
- and
- processor means coupled to said voltage-to-frequency converter means for alternately applying the output of said analog multiplexing means and the output of said precision voltage reference means to said voltage-to-frequency converter means and for computing the temperature sensed by said temperature sensing means in accordance with a predetermined mathematical relationship involving parameters derived from the output of said temperature sensing means and the output of said precision voltage reference means.
3 more elements
Dependencies are inferred from the claim text.