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US 5,672,289 AGranted
Heater control circuit
AssigneeThe Perkin-Elmer Corporation
InventorMichael J. O'Neill
Life of this patent
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Abstract
A Control circuit for a differential scanning calorimeter which includes a sample heater, a reference heater, a system for generating a sample heater DC voltage and a system for generating a reference heater DC voltage. A balanced operational amplifier arrangement is provided which includes a circuit for controlling the differential heater voltage and a circuit for independently controlling the average heater voltage, so that the average heater power and the differential heater power are independently controlled.
Claims6
A control circuit for a differential scanning calorimeter comprising, in combination,
- sample heater means, including means for generating a sample heater DC voltage;
- reference heater means, including means for generating a reference heater DC voltage;
- means for measuring a difference voltage between said sample heater DC voltage and said reference heater DC voltage;
- means for measuring an average voltage of said sample heater DC voltage and said reference heater DC voltage;
- and
- a heater control circuit including means for independently controlling said differential heater voltage in response to said difference voltage and means for independently controlling said average heater voltage in response to said average voltage.
3 more elements
Dependencies are inferred from the claim text.