Thermocouple Measurement Circuit
First Claim
1. A thermocouple measurement circuit comprising:
- a thermocouple input for sensing a temperature at a measuring point;
a compensation circuit for compensating thermocouple effects of junctions of the thermocouple; and
an instrumentation amplifier for summing an output of the thermocouple and an output of the compensation circuit and outputting a voltage indicative of the temperature sensed.
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Accused Products
Abstract
A thermocouple measuring circuit for sensing a temperature at a measuring point is provided. The thermocouple measurement circuit (12) includes a thermocouple input for sensing a temperature at a measuring point, a compensation circuit (14) for compensating thermocouple effects of junctions of the thermocouple, and an instrumentation amplifier (16) for summing an output of the thermocouple and an output of the compensation circuit and outputting a voltage indicative of the temperature sensed, wherein the output of the compensation circuit is a reference voltage for the output of the instrumentation amplifier. Various embodiments of the thermocouple measurement circuit may be employed in electrosurgical generators for controlling output power dependent on temperature conditions.
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Citations
20 Claims
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1. A thermocouple measurement circuit comprising:
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a thermocouple input for sensing a temperature at a measuring point; a compensation circuit for compensating thermocouple effects of junctions of the thermocouple; and an instrumentation amplifier for summing an output of the thermocouple and an output of the compensation circuit and outputting a voltage indicative of the temperature sensed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electrosurgical generator comprising:
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a radio frequency (RF) output circuit for outputting RF energy; a control circuit for controlling the output of the RF output circuit; and a thermocouple measurement circuit for determining a temperature at a measuring point, the thermocouple measuring circuit comprising; a thermocouple input for sensing a temperature at the measuring point; a compensation circuit for compensating thermocouple effects of junctions of the-thermocouple; and an instrumentation amplifier for summing an output of the thermocouple and an output of the compensation circuit and outputting a voltage indicative of the temperature sensed to the control circuit. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An electrosurgical system comprising:
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an electrosurgical generator for outputting radio frequency (RF) energy; an electrosurgical instrument coupled to the electrosurgical generator for applying the RF energy to an operative site; and a thermocouple measurement circuit for determining a temperature at the operative site, the thermocouple measuring circuit comprising; a thermocouple input for sensing the temperature at a measuring point of the electrosurgical tool; a compensation circuit for compensating thermocouple effects of junctions of the thermocouple; and an instrumentation amplifier for summing an output of the thermocouple and an output of the compensation circuit and outputting a voltage indicative of the temperature sensed to the electrosurgical generator, wherein the electrosurgical generator controls the output energy based on the sensed temperature. - View Dependent Claims (18, 19, 20)
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Specification