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[FAQ] Sensors In Ovens

Other Parts Discussed in Thread: TMAG5273EVM

Do home appliances –specifically ovens—use position sensors such as Hall-effect or Inductive sensors to detect movement or exact position of moving parts?

  • This is a very good and question and something most people really don’t think about. Appliances are something we interact with on a regular basis, and sensors can help improve the quality of our interactions with our devices. Sensors allow our appliances to gather data from the physical world and use that information to enhance the way a task is performed. Essentially any piece of electronic equipment that has moving parts has the potential to use a positions sensor and home appliances are a perfect example of this. In short, the answer is “yes”. Let me provide you a couple use cases where position sensors are used in ovens.

    Use Case #1: Touch Buttons

    Kitchens aren’t always as clean as we would hope, and appliances found in kitchens, such as ovens, are prone to food spills or grease buildup. Inductive touch buttons provide a hermetically sealed touch button which can precisely measure the distance from the sensor coil to a metal touch button. The graphic below shows the placement of inductive touch buttons and how they are implemented mechanically.

                                                                                                

    Recommended Products:

    Device

    Datasheet

    Description

    System-Level Benefits

    LDC2114/LDC2112

    Low-power, multi-channel inductance-to-digital converter

    Equipped with button algorithm with baseline tracking, the sensor can automatically correct for any deformation in targets due to aging or mechanical drift.

     

    LDC3114

    Low-power, 4-channel inductance-to-digital converter

    Contains button algorithm and baseline tracking present in the LDC211x devices. Enables users to disable baseline reset.

    Use Case #2: Rotary Knobs

    Rotary knobs are often used in an oven to set temperature or select between various functions, they are typically implemented by using potentiometers or rotary encoders. When the dial is used, the knob is turned alongside the potentiometer. This mechanical interaction provides a point of wear and tear that can cause breakdown over time. Using Hall-effect sensors for a magnetic rotary dial creates a contactless solution that not subject to the same level of wear and tear as mechanical implementations.

                                                                                       

    Recommended Products:

    Device

    Datasheet

    Description

    System-Level Benefits

    TMAG5273

     Low-power, 3D linear Hall-effect sensor

    Contains internal CORDIC algorithm that is able to determine the rotational position of the knob.

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