Modeling of Frequency Characteristics of Automatic Control Systems of Peltier Thermoelectric Modules

The numerous advantages of thermoelectric systems based on Peltier modules (TEM) determine the high prospects for their applications when traditional compressor cooling systems are ineffective (radioelectronic, aerocosmic, medical, industrial equipment, etc.). It is shown that to improve the characteristics of climate control systems based on TEM, it is promising to analyze the frequency characteristics of the system for influences applied to various points of the system. A block diagram of a two-channel climate control system based on TEM has been developed according to the principle of combined control, which allows to achieve both a high speed of temperature transients and high interference suppression. Based on the transfer functions for three impacts, the amplitude-frequency and phase-frequency characteristics of the system of different orders and with different inertial properties are obtained. Analytical expressions and graphs of the frequency characteristics of the system for various types and orders of the filter in the control circuit are shown. The results of the analysis can be used to optimize the dynamic properties of the system under the influence of interference with different spectral characteristics.