The reasons behind the use of electronic components cooling fans in projectors.new mini rechargeable fan

　　Projectors are now used more and more frequently in our lives. Because people have higher and higher requirements for entertainment enjoyment, multimedia equipment has become more and more advanced. So what is hidden behind the reason why the projector uses the cooling fan of electronic components? Let's take a look at the heat dissipation problems of the projector.

　　As people's demand for large-screen output becomes stronger and stronger, and the price of projectors continues to drop, the frequency of people's exposure to projectors in their lives is also increasing. Whether it is for work or home use, for most users, facing the projector is still a novice, and all they do is simply project the picture on the screen or wall, and how to maintain and extend the life of the projector is Little is known. Among them, the projector also needs maintenance and reasonable use, especially in terms of heat dissipation, it is the most important thing. After the projector has been working for a long time, if you put your hand on the cooling fan on the back of the projector, you will obviously feel that there is a scalding heat emitting continuously. Do you know where this heat comes from? ?If the heat is not removed in time, will it cause damage to the projector? So how can we take measures to effectively dissipate heat from the projector?

　　Where does projector heat come from?

　　When you read the product parameters of the projector, you must have noticed that there is a parameter about the power of the bulb. In fact, the reason why the projector can project light depends on the backlight bulb. The projector needs high brightness. In order to project the image on the screen clearly, its power is generally above 100W. If the projector works continuously for a long time in such a small space, the lamp will emit huge heat. At the same time, the built-in regulated power supply of the projector will also emit a lot of heat. If the heat is not dissipated in time, it will cause a very high temperature inside the projector. In the case of high temperature, the working efficiency of the projector will be reduced. If it works for a long time, the service life of the projector will be greatly shortened. In fact, most electrical appliances do not have the ability to withstand high temperature continuously for a long time.

　　The harm of heat to the projector

　　The large amount of heat emitted by the imaging system of the projector will cause the internal temperature of the projector to rise rapidly, and the quartz on the inner wall of the projector bulb will devitrify under high temperature, resulting in white spots. The abnormal temperature rise in this local area causes the devitrification area to expand further, resulting in a rapid attenuation of brightness and a possible explosion of the bulb. In addition, the physical properties of the chip board inside the projector determine that its working temperature is not allowed to be too high. Once the temperature of other optical components exceeds their tolerance range, the optical components will also be damaged. The heat radiated from the power supply part of the projector will cause the temperature of the power supply part to be too high, which will cause the electrolytic capacitor of the internal power supply of the projector to dry up, thereby causing the power switch tube of the projector power supply to burn out.

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　　Projector heat dissipation design

　　How to carry out overheat protection

　　At present, many projectors on the market dissipate the heat generated by the optical imaging system inside the projector and the heat generated by the power supply part of the projector by installing a fan group inside the projector. When the machine works under the action of the fan, its interior will be in a state of thermal equilibrium.

　　In addition, after using the projector for a long time, the power cannot be cut off immediately, because the internal temperature is very high at this time. Once the cooling system stops working immediately, the accumulated heat will not be dissipated, which will also cause damage to the projector. The correct thing to do is to turn off the bulb, let the cooling system continue to work for a few minutes, and then turn off the power completely when the temperature cools down. Now some projectors also have a delayed shutdown function, which will automatically shut down the entire host after the cooling is completed, so that users do not have to wait for the cooling by the projector.

　　The heat dissipation of the projector is a problem that is difficult to solve at the moment. Major manufacturers are also actively researching improvement methods, such as improving the fan structure, increasing the air supply, reducing the heat generated by the bulb, etc. I believe that one day, we will no longer have to provide projectors worry about the heat problem.

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