Projector and method and system for controlling rotation speed of fan in projector

Abstract

The invention is applicable to the technical field of projectors, and provides a projector and a method and system for controlling the rotation speed of a fan in the projector. The method comprises the following steps of: driving the fan to rotate according to a pre-set fan initial voltage; detecting and calculating a current rotation speed of the fan; judging the size relationship between an absolute value of the difference of the current rotation speed and a target rotation speed and a tolerance value; if judging that the absolute value is not more than the tolerance value, representing that the deviation between the current rotation speed and the target rotation speed of the fan is within a tolerance allowance range so as not to modulate the rotation speed of the fan; returning to the step of detecting and calculating the current rotation speed of the fan; if judging that the absolute value is more than the tolerance value, calculating a modulation width of the fan according to the current rotation speed and the target rotation speed; calculating current driving voltage of the fan according to the modulation width; and driving the fan to rotate according to the calculated current driving voltage of the fan. According to the method and the system disclosed by the invention, the rotation speed of the fan can be effectively controlled so as to effectively dissipate heat of an LED (Light Emitting Diode) solid state light source precisely and rapidly.

Description

technical field [0001] The invention belongs to the technical field of projectors, and in particular relates to a method and system for controlling the rotational speed of a fan in a projector, and the projector. Background technique [0002] Traditional commercial and engineering projectors have the disadvantages of large size, high power consumption, and short bulb life, while LED solid-state light source projectors have the advantages of relatively small size, low power consumption, and long life. With the development of semiconductor light-emitting materials in recent years The development and improvement of LED solid-state light source technology have brought new development opportunities to the projection industry. However, based on the reality that LED solid-state light sources are extremely sensitive to temperature and the speed of individual fans is highly discrete, it is difficult for conventional fan speed modulation systems to achieve accurate and rapid heat diss...

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Problems solved by technology

[0003] The object of the present invention is to provide a method, system and projector for controlling the fan speed in a projector, aiming to solve the problem in the prior art that the fan speed cannot be effectively controlled to achieve accurate and fast effective LED solid-state light source. cooling problem

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