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What is the principle of projector radiator? Tell you about Deutsche Electronics Technology

Speaking of projectors, I believe that everyone is very good, then you know how the radiator principle of projectors? Now let's discuss the original explanation of projectors.

With the popularization of projector radiator application, users'understanding of projector is gradually deepening in the process of use. LCD digital projector uses LCD imaging technology to realize large screen display with high definition through optical system enlargement. In the whole projector structure, the optical part is the core of the imaging display, in which the light bulb and the liquid crystal plate 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, while the equipment itself is small, which makes the heat concentrated. 75% of the power of the whole projector is dissipated in a space only the size of a fist. If the temperature is too high, the quartz in the inner wall of the bulb will lose its permeability at high temperature, which will produce white spots. Because of the large amount of light blocking at the impermeable area, the temperature of the local area will rise abnormally, and then the impermeable area will be further expanded, thus the brightness will be attenuated, and the bulb will probably explode.

The light emitted by the light bulb converges on the liquid crystal board after the optical system converges. Although after UV/IR coating, cold reflector and other measures to filter out the infrared ray, there is still a great deal 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 plate, determine that its working temperature is not allowed to be too high. Once the temperature exceeds its endurance range, other optical components will be damaged, such as the polarizer near the LCD will be depolarized at higher temperature.

In addition to optical system, the switching power supply of projector radiator is also an important heat source. Switching power supply undertakes the task of supplying power to the projector circuit and to the light bulb. Due to the use of proportional pulse width modulation (PPWM) for voltage reduction, voltage stabilization and power stabilization, the power switches and transformers all work at higher frequencies, and the switching losses caused by it increase the temperature. Because of the small size of the power supply, the heat source is concentrated.

If the temperature of the power supply is too high, the electrolytic capacitor will dry up and the power switch will burn down. Because the projector itself produces a lot of heat energy and has many heat sensitive components, in order to ensure the safety of the projector, heat dissipation and high temperature thermal protection function become a design requirement that all projectors must consider.

In the LCD projector, fans are used to heat the core part of the projector and the main heat source such as power supply. In order to ensure the life of the projector, the temperature sensor installed in the projector monitors the temperature change in the projector in real time and feeds back to the processing circuit.

When the radiator of projector works, under the action of the radiator fan, the interior is in a state of thermal balance. This state is related to the external temperature. When the external temperature exceeds a certain temperature (mostly 35-36 degrees), the temperature of the important parts of the interior will also exceed its rated standard. Important heat sinks 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 the critical point above the region, the protection program inside the projector will start and automatically shut down the projector.

This is the basic working principle of radiation system and high temperature thermal protection function of projector radiator. This function ensures the service life of the projector to a great extent.

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