No matter how perfect the laser projector's heat dissipation function is designed, it is difficult to ensure that the projector will be heated for a long time. Because the projector itself generates a lot of heat, many components are sensitive to temperature. Therefore, in order to ensure the safe use of the projector. The high temperature thermal protection function has become a design requirement that all projectors must consider.
In the liquid crystal projector, the main part of the projector and the main heat source such as the power supply are mainly used to dissipate heat through the fan group. At the same time, in order to ensure the life of the projector, the temperature sensor installed inside the projector monitors the temperature change in the projector in real time. And feedback to the processing circuit. When the projector is working, the inside is in a thermal equilibrium state under the action of the cooling fan.
This state is related to the outside temperature. When the outside temperature exceeds a certain temperature (mostly 35~36 °C), the temperature of the important parts inside will exceed its rated value. The important heat sink has its own temperature sensor (such as near the liquid crystal, above the bulb, on the heat sink of the power supply). Once the temperature reaches the critical point of operation of the area, the internal protection program of the projector will start and the projector will be turned off automatically. This is the basic working principle of the projector's cooling system and high temperature thermal protection. This feature maximizes the life of the projector.
With the expansion of the use of laser projectors and the high-intensity use in individual areas such as education, surveillance, etc., high-temperature thermal protection functions are shifting from protecting the role of the projector to influencing the role of use in these areas. In addition, in order to enhance the air circulation effect, the noise generated by the cooling fan used in the projector may also affect the user's use. It can be seen that the heat dissipation and temperature protection are the necessary functions of the projector, and there is a contradiction between this function and the user's use.
A survey of projector use was conducted in 100 schools across the country. The survey results show that the current high-temperature thermal protection in schools with more than 50% is paid enough attention. In schools with high projector usage rates, the school classroom environment is not ideal, 100~ There are 200 large classrooms, the indoor temperature is as high as 35 °C, and the projector is working for nearly 8 hours per day. The frequency of high temperature thermal protection of the projector is significantly increased, and directly affects normal teaching activities.
In order to solve this problem, some schools consider adding air-conditioning equipment to lower the ambient temperature, but because of the large investment, they are only suitable for schools with sufficient funds. Currently, it is common practice in schools to add a larger exhaust fan to the rear of the projector, but according to actual tests, this method does not significantly reduce the frequency of high temperature thermal protection. This is because the projector is mostly hoisted in the classroom, and the number of students in the classroom is generally large. When the room temperature is 32 °C, the indoor top temperature has reached 36 °C (36 °C is the starting temperature of the projector thermal protection function). Since the ambient temperature has reached the critical temperature, installing the fan does not reduce the temperature of the air entering the projector, and the fan is outside the machine, which cannot effectively increase the air flow rate inside the projector. Therefore, installing the fan does not reduce the frequency of high-temperature thermal protection.
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