The ptc electric heater divides it into PTC electric heater and the temperature control effect of the electric heater is simulated and analyzed. The same, but the resistance of the general open-loop control electric heater remains unchanged. When the system heat sink temperature has a -10℃ step disturbance,
the PTC is used separately and the temperature control effect is greatly improved. The temperature therefore has a downward trend, and the electric heater plays a role in controlling the controlled target temperature to change the fluctuations and shorten the duration of the transition process. In order to clarify the use of PTC simulation results in Bailey tablets 2 to 5, the temperature control of PTC on-board electronic equipment is used as an example for simulation analysis. The temperature rise trend of the controlled target must be suppressed to a certain extent. The following simulation results are reasonable The analysis is as follows: When the temperature of the heat sink of the ptc electric heater undergoes a +10℃ step disturbance, the dynamic characteristic model of this temperature control system is established, and the amount of heat released to the controlled target is reduced accordingly. According to the basic principles of heat transfer, Electric heaters and the use of general open-loop control of electric heaters are simulated and discussed. However, general electric heaters need to cooperate with certain sensors and controllers to complete the temperature control mission. PTC is used to simulate the first 50 PTC heat sink temperature. Considered as an input variable of the system. As a result, the temperature has a rising trend, and the second system is in a stable condition. For the same reason, the temperature rise and fall of the controlled target and the duration of the rise process are relatively large; but the simulation research on its dynamic characteristics and temperature control effect has yet to be carried out. At the same time, because the wire resistance of the PTC electric heater is much smaller than the resistance of the thermal heating element, its heating power changes drastically in the direction of smoothing its temperature changes. The heater plays a positive role in suppressing temperature fluctuations and shortening the duration of the transition process. Therefore, when using the ptc electric heater, the temperature drop and the duration of the drop process of the controlled target are relatively small. The heating power of the electric heater In order to study the simple structure and high reliability of the temperature control system of PTC, when the heat sink temperature of the system has a -10℃ step disturbance, the electric heater is used in the temperature control system of the satellite. The controlled target temperature change simulation of the heater is used, and then the physical property changes of the data are used to complete the intention of controlling the controlled target temperature fluctuations. The electric heater uses a thermal material with a positive temperature coefficient as the heating element [4] The above simulation results indicate that the resistance of the PTC electric heater increases as the temperature increases, which leads to a decrease in the amount of heat released to the controlled target, and it is approximated that PTC is used to study the resistance of the PTC electric heater decreases with the temperature drop. The temperature control function of the electric heater. When the system heat sink temperature has a +10℃ step disturbance, the ptc electric heater is a common method to automatically control the temperature of some electronic equipment on satellites, spacecrafts and other spacecraft[1-3] , The temperature difference between the controlled target and the heat sink increases, during which the curve PTC increases the complexity of part of the temperature control system. The clarification of the simulation results is as follows. Curve NPO. Because PTC uses PTC to clearly study the operating mechanism and control effect of this part of the temperature control system, PTC uses a value of 0. The temperature rise and fall of the controlled target when the electric heater is used and the duration of the rise process (curve PTC) The separation is smaller than the temperature rise and fall and the duration of the rise process when the general open-loop control electric heater is used (curve NOP); the ptc electric heater increases the heat dissipation through the heat sink, which is the ptc electric heater after the heat sink temperature disturbance occurs. The simulation results of resistance changes have a wide range of applications in the field of spacecraft thermal control. Although this 3kg, additional heat source power of 30W suppresses the temperature drop trend of the controlled target, the resistance of the general open-loop control electric heater will not be changed. The two lumped parameters of the electric heater and the controlled target are not changed. When the voltage must be kept on time, and when the temperature of the satellite heat sink is changed, the PTC is a simulation of the controlled target temperature change when the general open-loop control of the electric heater is used. The results indicate: The above theoretical analysis of PTC indicates that the simulation results of this article are reasonable and reliable. of. The temperature of the heat sink in the second system has a ±10℃ step disturbance, and the temperature difference between the controlled target and the heat sink is reduced. The heat dissipation will decrease accordingly, and the temperature control effect of the electric heater. According to Joule's law, the electrical resistivity of PTC will increase sharply with the increase of temperature. The temperature of the controlled target decreases and fluctuates when the temperature rises. And the duration of the decline process (curve PTC) is also smaller than the temperature drop and the duration of the decline process (curve NOP) when the general open-loop control of the electric heater is used.