How much do you know about computer fans? This article will take you to understand the types of computer fans-scripttoolbox.com

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How much do you know about computer fans? This article will take you to understand the types of computer fans

time：2023-04-02 11:22:39 source：scripttoolbox.com author：Chassis

How much do you know about computer fans? This article will take you to understand the types of computer fans

Hello everyone, I'm a craftsman. In the process of purchasing a host, most people focus on CPU and graphics card, followed by memory, hard disk, power supply, etc., but it is easy to ignore one accessory, that is the chassis fan. It may be because for most of my friends, the chassis fans are of little significance, just two of them can dissipate heat. However, today Xiaojiang will give you a detailed introduction to the types and choices of chassis fans, because there are many types of fans now, and it is inevitable that there will be incompatibility after purchase. The main function of the computer fan is to inhale cold air and exhaust hot air, so as to achieve the purpose of heat dissipation. As the only mechanical moving accessory in the host, the fan is almost the only source of noise. Choosing a good fan can naturally improve the heat dissipation effect and reduce the impact of noise. In addition to the quality factor, another factor that affects noise is the fan speed. No matter how good the fan is, if the fan speed is too high, then the noise will be very loud. However, in order to remove heat, you have to increase the speed. Therefore, we have to find a balance between speed and noise. This involves the construction of the fan control system. Before building the fan control, we need to know the types of fan speed control on the market. At present, there are two main control strategies for fan speed: DC and PWMDC speed regulation: The strategy of DC speed regulation is very simple, that is, to adjust the speed by controlling the voltage supplied to the fan. PWM speed regulation: PWM adjusts the speed by controlling the on-off ratio. In simple terms, it is to quickly adjust the switch. When the frequency reaches a certain speed, the fan seems to be running continuously. When you set the ratio of ON to a larger value, the speed will be higher, and vice versa, the ratio of OFF will be larger, and the speed of rotation will be lower. After talking about these two speed regulation methods, let's introduce the various fan interfaces common on the market. Constant-speed fan: This kind of fan is generally directly connected to the wiring of the power supply to obtain electricity. As long as the host is powered on, it will start to rotate at a fixed speed. You can't control the speed of it, it's the same speed for a lifetime when you buy it. The biggest advantage of the fixed speed fan is its strong compatibility. After all, all the power supplies on the market have the interface. Secondly, even if the price is very low, because there is no need for speed control components, it can save a lot of costs, and the general price is only about ten yuan. The disadvantage is that the speed cannot be flexibly controlled. If you buy a higher speed version, there will be more obvious noise. Small 3PIN fan: The three wiring definitions of this type of fan are: +12V power supply, speed measurement, GND negative circuit Small 3PIN interface is more common on old chassis, there will be a chute on the fan interface, and it will be connected along the chute. Can. Since the interface only has power supply and speed monitoring lines, digital signals cannot be used, and only DC speed regulation mode can be used. The only disadvantage of DC speed regulation is that because it is adjusted by voltage, when the voltage is lower than a certain value, the fan cannot be driven to rotate, so the range of general speed regulation is very limited (for example, 800-1000 rpm). Small 4PIN fan: Compared with the small 3PIN above, the definition of the pin has a PWM speed control line, and the chute part is basically the same as that of the small 3PIN. Fans with small 4PINs all support PWM speed regulation. The range of PWM speed regulation is quite wide compared to DC. Of course, it depends on the different regulation strategies of manufacturers. Generally, it can be adjusted from 400-2150 rpm, and the range is very wide. But the disadvantage is that it is generally much more expensive than the above two. Manufacturer-customized interface: The last type is the private interface customized by some fans or water-cooling manufacturers. Power supply, speed regulation, RGB lighting, etc. are all concentrated on one line, which can only be used through their own hub controller. The speed of the fan and the adjustment of the light are all transferred to the motherboard through the hub and controlled by the software in the system. The interface is generally the USB2.0 jumper of the motherboard. But in essence, it is actually a PWM protocol customized by the manufacturer. The above are the several types of fans you can buy at present. Generally speaking, when installing the machine now, we do not recommend that you buy the first two, because the limitations are relatively large. Although the price is cheap and the compatibility is good, the actual use experience is very poor, and there is almost no room for adjustment. Now the most recommended is generally a small 4PIN fan, although the price is slightly high, but the adjustment is diverse, the customization is relatively strong. Okay, the above is the introduction to the types of computer case fans. If it helps you, I hope you can like and forward it to support it! If you have any other questions, please leave a message in the comment area, and the craftsman will reply after seeing it!

(Responsible editor：Power Supply)

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