What is the working principle of temperature control fan?
1. Working principle of temperature-controlled fan: it mainly depends on the temperature rise around the fan to speed up the rotation speed of the fan itself and strengthen the exhaust air volume. The temperature control fan mainly senses the temperature change of the surrounding air through the thermistor on the fan. When the fan is running, the thermistor can sense the wires. Even if the fan runs at a slower speed, it will produce less noise and consume less energy. In most design requirements, the air temperature is usually lower than the maximum design temperature after the fan runs for several hours. Under normal circumstances, the low-speed cooling fan can fully play its role.
2. There is a bimetal in the temperature control switch, which has different thermal expansion coefficients, so that it can be deformed to combine contacts when it reaches a certain critical temperature range, thus achieving the purpose of electrification. When it falls below this temperature range, it will return to the initial position and disconnect the line. This is mechanical. The surface of the temperature control switch will be marked with numerical values, such as 78 or 83.
Functional characteristics of PWM intelligent temperature control fan
First of all, the PWM fan adjusts the fan speed by directly obtaining the temperature information from the CPU, and there is no temperature measuring device on the fan. According to different CPU temperatures, the temperature-controlled fan will have different speed adjustments, and the speed change of the fan can be four or five levels, or even more, which is basically the feeling of stepless speed change. Because the pulse width signal is adjusted in real time, the change of fan speed is very sensitive, and the change of speed and CPU temperature is almost synchronous.
Second, the PWM fan can keep a low speed when the computer is in standby. When in standby, the CPU temperature is below 40℃ and the rotation speed is only about 1000 rpm, which greatly reduces the running noise. The designed maximum speed, above 2000 rpm, will only appear when the CPU temperature is close to the limit temperature, that is, 65-67 degrees. Compared with the traditional temperature control fan, the speed control range is wider, and the noise and performance problems are better solved.
Thirdly, the speed of PWM temperature control fan will rise to the highest at the moment of starting, and then drop to standby low speed level after a few seconds. This feature is also the most obvious feature of PWM intelligent temperature control fan, which can be used to judge whether the fan and motherboard really have PWM function, or whether their functions are faulty, and even can be used as a reference standard to judge whether the box radiator is true or false.
Above, Bian Xiao introduced the working principle of temperature control fan in detail. Firstly, the working principle of the temperature control fan is introduced, and then the functions of some important components are introduced, which are also important prerequisites for the normal operation of the temperature control fan. Bian Xiao also introduced the functions and characteristics of PWM intelligent temperature control fan, and always introduced three points. In fact, many intelligent temperature-controlled fans have these characteristics, so understanding this is also the characteristic of most intelligent temperature-controlled fans.
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