On January 20, 2025, Tyson Delo, Belgium - Melexis, a global microelectronics engineering company, announced the launch of the MLX90617 non-contact infrared temperature sensor chip designed specifically for induction cookers. This chip utilizes 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 using induction cookers, thereby greatly improving the overall user experience.

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

principle

MLX90617 adopts precise optical filtering technology optimized for induction cooker ceramic glass plates. This technology can accurately capture infrared radiation that penetrates the ceramic glass plate and originates from the bottom of the cooking container, and effectively filter out the infrared interference emitted by the ceramic glass plate itself through advanced algorithms, thereby ensuring the accuracy and reliability of temperature measurement.

operation mode

The MLX90617 is designed to work in conjunction with another non-contact temperature sensor chip (such as MLX90614 or MLX90632), both of which are installed beneath the ceramic surface of the induction cooker. In addition, LED and light sensor chips can be optionally selected to achieve in-situ emissivity measurement, thereby further improving measurement accuracy.

To accurately determine the temperature of the cooking container, MLX90617 is mainly responsible for measuring the radiation emitted from the bottom of the cooking container, while another sensor chip is responsible for monitoring the radiation generated by the ceramic glass plate and the sensor itself. Meanwhile, the integrated LED and light sensor chip are used to measure the reflectivity of the cooking container and calculate its emissivity. Through efficient real-time processing algorithms, the system can accurately calculate the temperature at the bottom of the cooking container, while effectively eliminating interference from ceramic surfaces and sensor chip radiation.

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

Improve the design of induction cookers

Electromagnetic stove manufacturers can create an advanced solution that significantly improves product accuracy and optimizes end-user cooking experience by integrating the MLX90617 chip from Mindray.

The sensor chip directly monitors the temperature at the bottom of the cooking container, rather than the surface temperature of the glass, allowing the electronic control system of the induction cooker to more accurately grasp the temperature of the food. This feature is particularly advantageous for cooking operations that require adjustment within a fine temperature range. In addition, the chip has a temperature limit detection function, effectively improving system security and promoting the development of more advanced automatic cooking systems.

The MLX90617 chip has a factory preset wide operating temperature range (0 ℃ to 125 ℃), designed specifically for measuring the temperature of cooking utensils within the range of 70 ℃ to 250 ℃. It adopts the industry standard TO39 package, supports 5V power supply voltage, and easily integrates into the induction cooker design through SMBus digital interface.

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

In depth development

At first, we developed the MLX90617 to respond to customer needs, but faced many challenges in processing weak shortwave infrared signals, which once made us question its feasibility, "said Joris Roel, marketing manager at Maixin." However, after in-depth research and application testing, we not only successfully overcame these obstacles, but also launched a solution that meets customer needs, is cost-effective, and easy to use

About Mailaixin Company

Melexis is committed to designing, developing, and providing cutting-edge sensing and driving solutions, putting people first and caring for the earth. Our mission is to assist engineers in translating their ideas into practical applications, working together to create a safe, comfortable, and sustainable future, making beautiful visions a tangible reality.

We focus on the automotive market and provide microelectronic solutions widely used in technology fields such as powertrain, thermal management, lighting, electronic braking, electronic steering, and batteries. At the same time, we actively explore emerging markets such as sustainable world, alternative mobility, robotics, and digital health, leading the trend of innovation.

Since its establishment in Belgium in 1989, Mindray has grown into a multinational enterprise with over 2000 employees spread across 12 countries worldwide, providing customers with cutting-edge technical support.