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

Infrared Sensor-Based Temperature Control for Domestic Induction Cooktops

1,* , 1
,
1
,
1
 and
2
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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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.
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 3.0).
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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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