Thermostatic controller for thermoelectric assemblies

Microcontroller-based device from Laird Technologies adds integrated temperature control to protect assemblies.

02/04/2010


Laird thermostatic controller

Thermstatic controller for TRAs


Laird Technologies, Inc., designers and manufacturers of customized, performance-critical components for wireless systems and other electronics applications, has announced its new Q Series thermostatic controller for most of its thermoelectric assemblies (TEAs) . Such TEAs are used to raise or lower the temperature of enclosures or even small process devices using thermoelectric modules (TEMs). Units can either heat or cool as needed without refrigerants and are used in many applications where small-scale climate control is needed.

The Q Series is a microcontroller-based device line that adds integrated temperature control to a TEA. The controller functions as a single directional unit that offers heating or cooling temperature control for the application. "The Q Series removes the complexity of designing a closed loop feedback control system to drive a TEA in a thermal management system," says Andrew Dereka, product manager for Laird Technologies . "The controller reduces power consumption of the TEA over time and extends its operational life, which benefits total cost of ownership."

Programming for advanced controller options and features is available to meet unique application configurations. All programming is conducted in-house by Laird, and can include functions such as alarm shutoff, upper and lower temperature limits, upper and lower voltage limits, and tachometer limits.

The temperature set point ranges from -20 to 50 °C (-4 to 122 °F) and can be adjusted with an internal or external potentiometer. The controller operates in one of three temperature regulation modes:
• On/Off - Switches TEM output between full power and zero power at the programmed set point and hysteresis;
• PWM - Uses 8 kHz pulse-width modulation to control voltage for the main output; and
• Proportional - Uses a variable dc-voltage (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 A and 2 A respectively. Thermoelectric devices are used in many applications, including medical diagnostic machines, analytical instrumentation, small environmental enclosures, and electronic equipment cooling applications.

-Edited by Peter Welander, process industries editor, PWelander@cfemedia.com
Control Engineering Process Instrumentation & Sensors Monthly eNewsletter
Register here to select your choice of free eNewsletters .





No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
This eGuide illustrates solutions, applications and benefits of machine vision systems.
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
Additive manufacturing advancements; Machine vision enhances robotics; Fieldbus evolution; Process safety; Advice from System Integrators of the Year; Road to IANA
Salary and career survey: Benchmarks and advice; Designing controls; Remote data collection, historians; Control valve advances; Hannover Messe; Control Engineering International
System integration: Best practices and technologies to help; Virtualization virtues; Cyber security advice; Motor system efficiency, savings; Product exclusives; Road to Hannover
This article collection contains several articles on the Industrial Internet of Things (IIoT) and how it is transforming manufacturing.
PLCs, robots, and the quest for a single controller; how OEE is key to automation solutions.

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

The digital oilfield: Utilizing Big Data can yield big savings; Virtualization a real solution; Tracking SIS performance
Getting to the bottom of subsea repairs: Older pipelines need more attention, and operators need a repair strategy; OTC preview; Offshore production difficult - and crucial
Digital oilfields: Integrated HMI/SCADA systems enable smarter data acquisition; Real-world impact of simulation; Electric actuator technology prospers in production fields
click me