TCR Self-Calibration System for Electrically Heated Tobacco Products

An adaptive temperature coefficient of resistance (TCR) calibration scheme is proposed in this paper. The aim is to address temperature control errors caused by TCR of heating elements, in the heater of electrically heated tobacco products (eHTP). Data on the resistance and temperature of the heating element are collected. The adaptive scheme and a direct fitting scheme are executed based on the data obtained. Comparing the temperature control effect of the two schemes, it can be found that those two schemes have similar temperature control accuracy. The results show that the proposed scheme maintains temperatures within $\pm 3{}^{\circ }\mathrm{C}$ of the target, and the direct fitting scheme can control the temperatures within $\pm 2{}^{\circ }\mathrm{C}$ of the target. Finally, a physical test is carried out. The adaptive scheme can meet the expected criteria for TCR calibration and temperature control effects.