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Sensors 2014, 14(3), 5278-5295; doi:10.3390/s140305278

Infrared Sensor-Based Temperature Control for Domestic Induction Cooktops

1,* , 1
1 Applied Physics Department, University of Zaragoza, C/Pedro Cerbuna, 12, 50009 Zaragoza, Spain 2 Global Cooking Product Division, Induction Cooktop Development, Bosch and Siemens Home Appliances Group, Avenida de la Industria, 49, 50016 Zaragoza, Spain
* Author to whom correspondence should be addressed.
Received: 30 December 2013 / Revised: 12 February 2014 / Accepted: 13 February 2014 / Published: 14 March 2014
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Spain 2013)
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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.
Keywords: non-contact temperature measurement; infrared sensor; radiation detector; induction heating; temperature control non-contact temperature measurement; infrared sensor; radiation detector; induction heating; temperature control
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Lasobras, J.; Alonso, R.; Carretero, C.; Carretero, E.; Imaz, E. Infrared Sensor-Based Temperature Control for Domestic Induction Cooktops. Sensors 2014, 14, 5278-5295.

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