Heating Cup NTC Thermistor Solution

　　Heated water cups are widely loved by people because of their convenience. At the same time, the pursuit of the water cup will be more inclined to lightness, large capacity and small volume. There is also added complexity when meeting this need. The electronics in the drinking glass require an accurately controlled charging circuit not only to ensure that they are fully charged, but also to maximize their lifespan and prevent the dangers that can arise from overheating conditions.

　　Under the premise of reasonable cost performance, the solution is to use an NTC (negative temperature coefficient) thermistor. The NTC thermistor-type device provided is a compact solution that consumes very little power, is accurate over a wide temperature range, and responds quickly to temperature changes. From an engineer's point of view, these multiple form factor devices provide very high sensitivity for electrical and structural design.

　　The basic design and specification parameters of an NTC thermistor device are resistance value (usually at 25°C) and tolerance. However, it is important to remember that the working principle of the thermistor is closely related to temperature. Therefore, engineers want to ensure that the products they design can perform well when operating temperatures are extreme. In high temperature (low impedance) environments, the resistance value must be high enough to reduce system errors such as contact resistance and interconnect resistance. Conversely, in low temperature (high impedance) environments, if the current through the thermistor is not large enough, the sensitivity will drop.

　　Tolerance, usually expressed in °C, can be used as a measure of the accuracy of a device's temperature measurement. In a few cases, manufacturers give a tolerance in resistance value, which is how close a device's resistance is to its expected resistance value at a given temperature. It is important for detailers and buyers to keep in mind that tolerance requirements for a particular design can be controlled at a specific temperature or over a somewhat wider temperature range. Alternatively, the tolerance itself will vary as the device changes the value of the thermistor. Designers need to use the negative temperature coefficient specified for the device to calculate the resistance tolerance over temperature to ensure that the selected components meet the measurement accuracy requirements of the system.

　　Over the operating temperature range, the performance of a device depends on its own material and structure, and is described by three basic types of specifications, the device's R-T curve. When ordering NTC-type thermistor devices, designers often specify only the resistance, tolerance, and standard curve. However, in many cases other parameters are the key to ensuring that the system works as expected. One of the important parameters is the b value, which represents the sensitivity of the thermistor to changes in temperature. Equally important is the calibration tolerance of this parameter. Thermistor devices have B-values and tolerances that result in higher accuracy and better overall system reliability, as well as good performance over the entire operating temperature range of the device.

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