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Processor Temperature Control

The TL598 has two built in error amplifiers used for feedback control.  Error amplifier 2 is used for the temperature control section.  Temperature feedback comes from a thermistor inserted directly into the cold block located between the processor and thermoelectric device.  A bridge circuit and a differential amplifier (Q1D) provide signal conditioning for the temperature feedback.  A temperature set point is derived from a potentiometer (R5). The controller increases or decreases its output proportionally to compensate for the difference between temperature set point and the actual measured temperature. 

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University of Victoria    Faculty of Engineering    Dept. of Electrical Engineering
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Last updated: April 6, 2001.