초록

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.

대표청구항 ▼

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 c

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.