Analysis and compensation method of temperature characteristics for resistive heating element under environmental temperature variations

In order to address the temperature differences caused by changes in environmental temperature, which can impact the taste of tobacco in non-combustible cigarette heating devices, this paper proposes an analysis and compensation method for the temperature characteristics of resistive heating elements. The temperature distribution equation of the heating element is established based on the temperature coefficient of resistance (TCR) of the heating element material. The influence of environmental temperature changes on the set temperature value of the heating element is numerically simulated using COMSOL software. The mapping relationship between the input voltage of the heating element and its surface thermal equilibrium temperature is investigated. The error between the actual surface thermal equilibrium temperature and the pre-set thermal equilibrium temperature of the heating element under different environmental temperatures is calculated, and a temperature compensation control strategy for the heating element is developed. The environmental temperature of the heating element is adjusted in a water bath, and the temperature rise variation curve of the heating element under different input voltages is obtained at environmental temperatures of 20°C, 30°C, and 40°C. The findings indicate that as the environmental temperature rises, the heating element’s thermal equilibrium temperature also increases. With every 16°C change in the environmental temperature, there is an approximate ±5°C difference in the thermal equilibrium temperature of the heating element. By manipulating the input voltage of the heating needle, the temperature discrepancy caused by the environmental temperature can be adequately counteracted.