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Maximum Voltage Limiter


Error amplifier 1 on the TL598 is used to limit the maximum output voltage of the controller.  Only one of the error amplifiers can control the output at a time.  The error amplifier that is in control is always the one that is requesting the smallest output to the thermoelectric device.

 Voltage feedback comes from a voltage divider on the output of the power amplifier stage.  A voltage set point is derived from a potentiometer (R1). The controller increases or decreases its output proportionally to compensate for the difference between the voltage set point and the controller output voltage.  The voltage limiter control includes a capacitor for integrating the error so that the voltage output will equal the set point in steady state. 

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