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Laird Technologies Introduces New Q Series Thermostatic Controller for Thermoelectric Assemblies
Microcontroller-Based Device Adds Integrated Temperature Control to Most Thermoelectric Assemblies
The Q Series Thermostatic Controller is a microcontrollerbased device that adds integrated temperature control to a TEA. The controller functions as a single directional unit that offers heating or cooling temperature control to the device. Products in this series include TC-18-QC-50 and TC-18-QE-50.
"The Q Series Temperature Controller removes the complexity of designing a closed loop feedback control system to drive a TEA in a thermal management system," stated Andrew Dereka, Laird Technologies Thermoelectrics Product Manager. "The controller reduces power consumption of the TEA over time and extends its operation life, which benefits total cost of ownership"
Programming of advanced controller options and features are available to meet unique application configurations. All programming is conducted inhouse by Laird Technologies Engineering. Features include alarm shutoff, upper and lower temperature limits, upper and lower voltage limits, and tachometer limits.
The temperature set point ranges from -20°C to 50°C and can be adjusted with an internal or external potentiometer. The controller operates in one of three temperature regulation modes:
- On/Off - Switches the Thermoelectric Module (TEM) output between full power and zero power at the programmed set point and hysteresis.
- PWM - Uses an 8 kHz PWM to control the voltage for the main output.
- Proportional - Uses a variable DCvoltage (a PWM varied voltage filtered with a required external capacitor parallel to the load in order to function) for the main output.
The input power of the controller accommodates a supply voltage ranging from 12 to 58 VDC. Outputs power the TEMs and two DC fans from the supply voltage with a maximum available current of 16 Amps and 2 Amps. Additional outputs provide an LED feature that displays the status of the controller. If an error is detected based upon programmed parameters, an alarm is triggered that automatically shuts down the TEA.
Hardware circuit protection guards against reverse polarity and three sensors incorporate an NTC thermistor for closed loop feedback control. Two fan tachometers measure fan speeds.
The Laird Technologies Q Series Thermostatic Controller provides a single directional temperature controller solution for thermal management systems seeking thermostatic control. This device can be used to drive TEAs used in many of the medical diagnostic, analytical instrumentation, photonics laser, and electronic enclosure cooling applications.
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