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首页> 外文会议>International conference on Computational Methods and Experiments in Materials Characterisation >Modelling and experimental characterisation of self-regulating resistive heating elements for disposable medical diagnostics devices
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Modelling and experimental characterisation of self-regulating resistive heating elements for disposable medical diagnostics devices

机译：用于一次性医疗诊断设备的自调节电阻加热元件的建模和实验表征

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摘要

Resistive heating elements based on positive temperature coefficient (PTC) ceramics have the inherent advantage of self-regulating their temperature output via a rapid increase in resistance with increasing temperatures, and therefore require no additional control circuitry. This is particularly advantageous for medical devices, especially disposable molecular diagnostics, where minimal space requirements and power dissipation are crucial design factors, as well as low cost per device. However, rapid prototyping and design validation in silico through finite element analysis are hindered by the scarcity of material data on commercially available heating elements. The simplest characterization of the function of these heating elements is through the temperature coefficient of resistance, which is easily measured yet still provides an acceptable approximation. We propose a finite element model that relies only on the temperature coefficient to simulate the function of PTC heating elements. Model validation was done using a commercially available PTC heating element, the temperature coefficient of which was measured and inputted into the model to simulate a PMMA test structure designed to house the heater and accept Lab-on-a-Chip devices with typical dimensions (25mm × 75 mm).
机译：基于正温度系数（PTC）陶瓷的电阻加热元件具有固有的优势，即随着温度的升高，电阻的快速增加会自动调节其温度输出，因此不需要额外的控制电路。这对于医疗设备特别是一次性分子诊断尤其有利，在医疗设备中，最小的空间需求和功耗是至关重要的设计因素，而且每台设备的成本也很低。但是，由于市售加热元件的材料数据稀缺，因此无法通过有限元分析进行计算机快速原型设计和设计验证。这些加热元件功能的最简单表征是通过电阻温度系数，该温度系数易于测量，但仍能提供可接受的近似值。我们提出了一个仅依靠温度系数来模拟PTC加热元件功能的有限元模型。使用市售的PTC加热元件进行模型验证，测量其温度系数并将其输入模型中，以模拟PMMA测试结构，该结构旨在容纳加热器并接受典型尺寸（25毫米）的芯片实验室设备×75毫米）。

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