## 1 Introduction  
In recent years, light-emitting diodes (LEDs) light sources have become widely used. As the analysis shows, in most drivers used to control LEDs in LED lighting devices, there is no compensation for changes in the light parameters of LEDs or LED matrices when the temperature regime of their operation changes, although temperature significantly affects the electrical and light parameters of LEDs [1, 2, 3]. The performance of LED light sources is directly influenced by the temperature conditions of the device. Variations in temperature and current value have a significant impact on the LED's direct voltage and luminous flux [4, 5]. When LEDs operate at high temperatures, their luminous flux decreases, their service life is shortened, and there is a potential for a shift in the emitted light spectrum [6, 7]. Hence, it is crucial to address the challenge of minimizing the effects of temperature on the electrical and light characteristics of LED light sources in the design of both the LEDs themselves and their control devices (drivers) [8, 9]. Resolving this issue will lead to increased productivity and extended lifespan of LED light sources. LED control devices in lighting devices (drivers) perform the function of stabilizing the operating point of the LED on its current-voltage characteristic, which ensures the stability of the luminous flux when the voltage of the power source changes. In driver circuits, the following methods of stabilizing the operating point (operating mode) are used [10, 11]:LED current stabilization; - voltage stabilization on LEDs; - stabilization of both current and voltage of LEDs [12; 13]. The drivers that implement the first method are most often used--current stabilization when the supply voltage changes, using various stabilization methods and covered, as a rule, by current feedback [14; 15]. Structurally, such circuits are built on integral current stabilizers, have small dimensions, and are relatively low-cost [16; 17]. Their wide application is explained by the fact that current stabilization does not require such accuracy as voltage stabilization on an LED. This is due to the structure of its volt-ampere characteristic. If a change in the supply voltage by 10% leads to a change in the LED current by approximately the same 10%, then the voltage on the LED can change by no more than 1.0-1.5%. Therefore, to stabilize the voltage on the LED, precise voltage stabilizers are needed, which must provide a high stabilization factor. The scheme of such a stabilizer is quite difficult, has a higher cost compared to current stabilizers, and, as a rule, due to the absence of integrated circuits, it is performed on discrete elements, which increases its overall dimensions. LED light sources are mainly powered by an alternating voltage of 220 V (voltage rating in Ukraine), and integrated circuits of voltage stabilizers are produced for input and output voltages of only a few tens of volts. This explains the lack of implementation of the second method--voltage stabilization on LEDs--by the circuits of drivers of LED lighting devices. The third method of stabilization, which combines the previous two, is advisable to use in high-power LED light sources or to power group lighting systems when their high cost and more complex circuitry are justified. The temperature dependence luminous flux of LEDs is most significant in cases of using LEDs in some industrial halls, outdoor conditions, etc., when their luminous flux significantly decreases with increasing temperature [2; 18]. To compensate for this decrease, it becomes necessary to increase the LED current rather than keeping it constant [19; 20].