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Sharing the radiator principle


Speaking of projectors, I believe everyone is very, then you know what the principle of projector radiator is? Let's discuss the original description of the projector.
With the popularization of the application of projector radiator, the user's understanding of the projector is gradually deepening. Liquid crystal digital projector uses liquid crystal imaging technology to realize high definition large screen display by optical system enlargement. The optical part of the whole projector structure is the core of the imaging display, in which the light bulb and the liquid crystal board and their adjacent optical devices are the main components that generate heat and are vulnerable to heat damage.
The projection imaging technology of LCD projector radiator requires high output intensity of light source, and the small size of the equipment itself makes the heat very concentrated. 75% of the projector power is dissipated in a fist-size space. If the temperature is too high, the quartz in the inner wall of the bulb will be impermeable at high temperature, resulting in white spots. Because a large number of impermeable areas block light, the temperature of this local area is abnormally high, and then cause the impermeable area to further expand, so that the brightness of the bulb rapidly decays, and is likely to lead to bulb explosion.
The light emitted by the bulb converges on the liquid crystal board after the optical system converges. Although it has undergone UV / IR coating, cold reflector and other infrared filtering measures, but there is still a large amount of power concentrated on the liquid crystal board, polarizer and other small-area devices. The physical properties of the LCD projector's core component, the LCD panel, determine that its working temperature is not allowed to be too high. Once the temperature exceeds its endurance range, other optical components will also cause damage to optical components, such as the polarizer near the LCD will fade at a higher temperature.
Besides the optical system, the switching power supply of the projector radiator is also an important heat source. The switching power supply is responsible for the power supply of the projector circuit part and the power supply to the bulb. Due to the use of proportional pulse width modulation (PWM) method for voltage reduction and stabilization, stable power, its power switches and transformers are operating at higher frequencies, the switching loss caused by it makes the temperature rise. Because the power supply is small, the heat source is concentrated.
If the power supply temperature is too high, the electrolytic capacitor will dry up and the power switch tube will burn down. Because the projector itself produces a lot of thermal energy, and there are many thermal sensitive components, in order to ensure the safety of the use of the projector, heat dissipation and high temperature thermal protection function has become a design requirement of all projectors must be considered. 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 feeds back to the processing circuit.
When the projector radiator works, under the action of the cooling fan, the interior is in a thermal equilibrium state. This state is related to the external temperature, when the external temperature exceeds a certain temperature (most are 35-36 degrees), the internal temperature of important parts will exceed its rated standard. Important cooling parts have their own temperature sensors, such as near the liquid crystal, above the bulb, on the radiator of the power supply, once the temperature reaches above the critical point of the region, the projector internal protection program will start, automatically shut down the projector.
This is the basic working principle of the heat sink system and the high temperature thermal protection function of the projector radiator. This function maximizes the lifetime of the projector.
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