RU181858U1 - Device for thermoregulation of electronic equipment - Google Patents

Abstract

The solution relates to devices for placement of electronic equipment (REA) for special purposes for use in harsh operating conditions and can be used in electronic units for various purposes, having a closed sealed enclosure and used in conditions of low and high ambient temperatures. The technical result of the solution is to increase the efficiency REA operations by maintaining optimal temperature, increasing the reliability of REA components at low and high temperatures This is achieved by the fact that the thermoregulation device of electronic equipment consists of temperature sensors, a temperature controller, which uses the PID algorithm for determining the determining value of the power controller of the heating and cooling elements, which are installed between two layers of the housing, the lower layer of which is made of stainless alloy with low thermal conductivity, the upper layer, on which the electronic equipment is mounted on the reverse side, is made of aluminum alloy.

Description

The solution relates to devices for placement of electronic equipment (REA) for special purposes for use in harsh operating conditions and can be used in electronic units for various purposes, having a sealed enclosure and used in low and high ambient temperatures.

The well-known "Control system for preventive heating of electronic equipment at low temperatures", patent for utility model of the Russian Federation No. 966615 from 08/10/2010 Bull. Number 22.

The device consists of a heater of a warmed control cabinet, powered from an external network or from an autonomous source, a low temperature control unit, a high temperature control unit, an execution unit, and a protection block against the start-up of faulty equipment.

The device operates as follows. After the heater is turned on, the electronic equipment in a confined space is heated. When the minimum permissible temperature is reached, the low temperature control unit is triggered, which gives the command to the execution unit to start the electronic equipment. The high temperature control unit controls the upper limit of the permissible temperature and gives the command to the executive unit to turn off the electronic equipment. The protection unit, which blocks the operation of the high temperature control unit and the low temperature control unit, also prevents the unauthorized start of the control cabinet.

The disadvantage of this device is that it is designed to maintain the temperature regime, allowing the launch of electronic equipment only at low ambient temperatures.

A device is known as a prototype pre-launch preparation of the temperature regime for launching basic electronic equipment and maintaining the temperature regime of the Russian Federation No. 2479958 from 04/20/2013.

The prototype device comprises: a control unit that is connected to a temperature control unit, a heater, a cooler and a standby unit. This technical solution allows you to bring the temperature to the temperature range of the operating mode of the main electronic equipment (EAON), maintain the temperature in the temperature range of the EAON operation mode, turn on the EAON when the temperature of the interval of the EAON operation mode is provided, and also prevent the EAON from turning on if the interval temperature is not provided EAON operation mode.

The disadvantage of this device is that it uses the positional law of temperature control. With this method, the heater is supplied with full power until the set temperature is reached, after which the power supply is stopped. Despite this, the heated heater continues to give off heat and the temperature of the object continues to rise for some time, which leads to overheating, sometimes significant. When the object cools down, after reaching the set temperature value, the full power is again supplied to the heater. The heater first warms itself up, then the surrounding areas of the object, and thus cooling will continue until the heat wave reaches the temperature sensor. Therefore, the actual temperature may be significantly lower than the set value. Thus, with a positional control law, significant temperature fluctuations around a given value are possible.

These disadvantages are absent in the proposed device, consisting of temperature sensors, a temperature controller, which uses the PID algorithm for determining the determining value of the power controller of the heating and cooling elements, which are installed between two layers of the housing, the lower layer of which is made of stainless alloy with low thermal conductivity, the upper layer, on which the electronic equipment is mounted on the reverse side, is made of aluminum alloy.

The technical result of the solution is to increase the efficiency of the REA, by maintaining the optimum temperature, increasing the reliability of the REA components at low and high temperatures.

This is achieved by the fact that the thermoregulation device of electronic equipment consists of temperature sensors, a temperature controller, which uses the PID algorithm for determining the determining value of the power controller of heating and cooling elements, which are installed between two layers of the housing, the lower layer of which is made of stainless alloy with low thermal conductivity , the upper layer, on which the electronic equipment is mounted on the reverse side, is made of aluminum alloy.

In the claimed device, the proportional-integral-differential control law (PID law) is applied. PID implies a decrease in the power supplied to the heater as the temperature of the object approaches the set temperature. In addition, in the steady-state control mode according to PID law, there is the amount of heat power necessary to compensate for heat losses and maintain a given temperature.

The proportional-integral-differential control law provides a significantly higher accuracy of temperature maintenance than the positional one. Power N, which should be allocated by the heater (cooler), expressed as a percentage of its maximum power, is calculated by the formula:

where Kp, Ki, Kd are proportional, integral and differential regulation coefficients, respectively (PID coefficients).

The first term in the expression (proportional component) is directly proportional to the "residual" ΔТ = Tus-TΔ of the difference between the temperature setting Tus and the measured temperature T. Its meaning is that with the "residual" ΔТ = Кр (in ° С) the regulator begins to reduce power.

The second term in the steady state control mode is equal to the amount of heat power needed to compensate for heat loss at ΔТ = 0.

The third component is proportional to the rate of temperature change with the opposite sign and should prevent sharp changes in the temperature of the object (differential component).

The technical result of the solution is to increase the efficiency of the REA, by maintaining the optimum temperature, increasing the reliability of the REA components at low and high temperatures.

In FIG. 1 shows a general diagram of a thermoregulation device, FIG. 2 is a view of the inner layer with a heating and cooling element.

In FIG. 1, 2 are designated: 1 - temperature controller, 2 - temperature sensors, 3 - power regulator of the heating and cooling element, 4 - heating element, 5 - cooling element, 6 - electronic equipment, 7 - lower layer of the stainless steel housing, 8 - the upper layer of the housing is made of aluminum alloy.

The thermoregulation device of electronic equipment, consisting of a temperature controller 1, receiving values from temperature sensors 2 and using the PID control algorithm, the power value is transmitted through the power regulator 3 to the heating 4 and cooling elements 5, which maintain the operating temperature of CEA 6.

At low ambient temperatures, the device turns on in pre-heating mode, without starting up the measuring equipment, and works until the operating temperature is reached.

Upon reaching and maintaining the operating temperature, the controller switches off the preheating mode and starts the computing system with measuring devices. To maintain the temperature, feedback is implemented through the control of the voltage regulator. When the temperature increases or decreases, the temperature sensor data is sent to the controller using the PID control algorithm, where the parameters are calculated and the required power value is supplied to the power regulator in which the input power of the heating and cooling elements is regulated.

One of the main requirements for electronic equipment is reliable and trouble-free operation in harsh climatic conditions: for example, indoor temperatures at launch complexes can vary from minus 40 to 55 ° С. In order to satisfy these requirements, it is necessary to monitor the provision of thermal operating modes of REA and systems. To ensure stable operation of REA in conditions of low and high temperatures, a thermoregulation system was developed that ensures the maintenance of optimal REA temperature using the PID control algorithm that determines the power values of heating and cooling elements.

The thermoregulation device for electronic equipment operating at extreme temperatures represents a complete design that can be transported and mounted as a whole as a unit and does not require structural connections with air ducts and cooling systems. The presence in the device of the temperature control module of the 3 operating modes, depending on the required temperature, allows you to maintain the required operating temperature for the REA both at negative outside temperatures and at positive temperatures in the designated temperature range.

Claims (1)

Thermoregulation device for electronic equipment, consisting of a heating and cooling element, characterized in that the casing consists of two layers, the lower layer of which is made of stainless alloy with low thermal conductivity, the upper layer on which the measuring equipment is mounted is made of aluminum alloy, on the reverse the side of which the heating and cooling elements are attached, temperature sensors, a temperature controller and a power controller, a temperature controller are used Mode uses a PID controller, with which the power value supplied to power regulator of heating or cooling element.

Images