Infrared sensor-based temperature control for domestic induction cooktops
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Published on: April 30, 2018
Javier Lasobras1, Rafael Alonso2, Claudio Carretero3
1Applied Physics Department, University of Zaragoza, C/Pedro Cerbuna, 12, 50009 Zaragoza, Spain. lasobras@unizar.es.
Abstract:
In this paper, a precise real-time temperature control system based on infrared (IR) thermometry for domestic induction cooking is presented. The temperature in the vessel constitutes the control variable of the closed-loop power control system implemented in a commercial induction cooker. A proportional-integral controller is applied to establish the output power level in order to reach the target temperature. An optical system and a signal conditioning circuit have been implemented. For the signal processing a microprocessor with 12-bit ADC and a sampling rate of 1 Ksps has been used. The analysis of the contributions to the infrared radiation permits the definition of a procedure to estimate the temperature of the vessel with a maximum temperature error of 5 °C in the range between 60 and 250 °C for a known cookware emissivity. A simple and necessary calibration procedure with a black-body sample is presented.
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