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Melexis introduces the MLX90617, a non-contact infrared temperature sensor chip designed for induction stoves. The chip uses innovative optical filtering technology to penetrate the ceramic panel of the induction cooker and accurately measure the temperature at the bottom of the cooking container. This breakthrough technology not only greatly improves the accuracy of cooking control, but also significantly enhances the safety of induction cooker use, thereby significantly improving the overall user experience.

Due to the limitations of the existing technology, the temperature control of the traditional induction cooker mainly relies on the temperature monitoring on the back of the ceramic glass plate, which affects the accuracy of temperature control to a certain extent. To overcome this limitation, Melexis has successfully developed an advanced and cost-effective MLX90617 solution that penetrates the ceramic glass plate of the induction cooker to accurately measure the temperature at the bottom of the cooking container in real time.

Principle

The MLX90617 uses precise optical filtering technology optimized for the ceramic glass plate of induction cookers. The technology accurately captures the infrared radiation that penetrates the ceramic glass plate and originates from the bottom of the cooking container, and effectively filters out the infrared interference emitted by the ceramic glass plate itself through advanced algorithms, thus ensuring the accuracy and reliability of temperature measurements.

Working mode

The MLX90617 is designed to work with another non-contact temperature sensor chip, such as the MLX90614 or MLX90632, both of which are mounted below the ceramic surface of the induction cooker. In addition, optional LED and light sensor chips are available for in-situ emissivity measurement, further improving measurement accuracy.

To accurately measure the temperature of the cooking container, the MLX90617 mainly measures the radiation emitted from the bottom of the cooking container, while the other sensor chip monitors the radiation generated by the ceramic glass plate and the sensor itself. At the same time, an integrated LED and light sensor chip is used to measure the reflectivity of the cooking container and thus calculate its emissivity. Through efficient real-time processing algorithm, the system can accurately calculate the temperature at the bottom of the cooking container, and effectively eliminate the interference of the ceramic surface and the sensor chip's own radiation.

Compared to the standard method of measuring ceramic glass temperature (Tglass) in traditional induction stoves, the MLX90617 uses advanced optical filtering technology to directly measure the temperature at the bottom of the cooking container (Tpot) through the glass in real time. The comparison results show that the measurement results provided by the MLX90617 are significantly closer to the true temperature of the cooking container, fully demonstrating its excellent temperature measurement accuracy.

Improve induction cooker design

By integrating Melexis' MLX90617 chip, induction cooker manufacturers can create an advanced solution that significantly improves product accuracy and optimizes the cooking experience for end users.

The sensor chip directly monitors the temperature at the bottom of the cooking container, rather than the glass surface, so that the electronic control system of the induction cooker can more accurately grasp the temperature of the food. This feature is particularly beneficial for cooking operations that require adjustment within a fine temperature range. In addition, the chip has a temperature overrun detection function, which effectively improves system safety and promotes the development of more advanced automatic cooking systems.

The MLX90617 chip has a wide factory preset operating temperature range (0 ° C to 125 ° C) and is designed for cookware temperature measurement in the range of 70 ° C to 250 ° C. It comes in an industry-standard TO39 package, supports a 5V supply voltage, and is easily integrated into induction cooker designs via the SMBus digital interface.

The MLX90617 chip highly integrates the infrared thermopile detection element, signal conditioning ASSP, low noise amplifier, 17-bit ADC, and high performance DSP unit into the TO39 package for high precision and high reliability temperature measurement.

For more information, please visit http://www.melexis.com/MLX90617.

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