A cooling fan control circuit and computer capable of intelligent voltage selection

Abstract

The invention discloses a cooling fan control circuit with an intelligent voltage selecting function and a computer. The cooling fan control circuit comprises a power main power module, a power interface, a main control circuit and an auxiliary circuit. The power interface is connected with the power main power module and the main control circuit. The main control circuit can be started or stopped according to system ambient temperature and automatically adjusts rotating speed of the cooling fan during running. The auxiliary circuit allows the cooling fan to run in the case that system temperature rise is low and the main control circuit idles or that running stops after power-off. The main control circuit is used with the auxiliary circuit, allowing the cooling fan to be powered by the auxiliary circuit through low auxiliary voltage in the case of low temperature rise and power-off of the system, and in this way, a stable low-working voltage is provided, loss and noise are reduced, heat in a main unit is emitted and effective radiating is achieved. After the system runs for a while, the cooling fan F is powered by the main control circuit through high-working voltage, and multi-stage intelligent control of the cooling fan is realized by adjusting the rotating speed of the cooling fan under the high-working voltage.

Description

technical field [0001] The invention relates to the technical field of heat dissipation of electronic products, in particular to a cooling fan control circuit and a computer capable of intelligently selecting a voltage. Background technique [0002] At present, in the period when electronic products are popular, computers are widely used. In the process of using calculations, the operation of electronic components inside the computer will consume a lot of power, and a large part of these will be dissipated in the form of heat, causing the temperature inside the computer to rise. High, and most electronic components will affect their electrical quality and shorten their service life due to the increase of ambient temperature. To solve this problem, a cooling fan is generally installed in the computer, and the cooling fan is used to reduce the temperature. The proper functioning of the electronic components inside the computer,. [0003] The computer usually includes a drivin...

AI Technical Summary

Problems solved by technology

[0002] At present, in the period when electronic products are popular, computers are widely used. In the process of using calculations, the operation of electronic components inside the computer will consume a lot of power, and a large part of these will be dissipated in the form of heat, causing the temperature inside the computer to rise. High, and most electronic components will affect their electrical quality and shorten their service life due to the increase of ambient temperature. To solve this problem, a cooling fan is generally installed in the computer, and the cooling fan is used to reduce the temperature. the proper functioning of electronic components within the computer,

[0003] The computer usually includes a driving power supply of 12V converted from AC to DC and an auxiliary power supply of 5VSB. The general design is to apply a driving power voltage of 12V to the cooling fan. The cooling fan will always run at a fixed speed under this voltage, but there will be Some defects, such as the cooling fan runs at a constant speed during the period from startup to shutdown of the computer, so the cooling fan must always keep running at a high speed to ensure that the computer can dissipate heat when the temperature inside the computer is the highest, and the cooling fan consumes more. More power may even affect the service life. In view of this problem, some developers have designed a new cooling fan operation circuit, which can adjust the speed of the cooling fan according to the change of system temperature. For example, China's new patent authorization, authorization announcement No. CN201638134U discloses a cooling fan control circuit, the control circuit is mainly composed of triodes connected to the 12V driving power supply voltage, resistors and temperature sensing elements, and is powered by the 12V driving power supply voltage during the power-on period. Within a certain period of time, the speed of the cooling fan can be adjusted according to the temperature change of the heating and temperature-sensing electronic components, so as to avoid the long-term high-speed operation of the cooling fan and achieve the purpose of reducing power loss, but the following defects still exist

[0004] When the temperature is low and the temperature rise inside the computer is not high, the cooling fan can slow down, but it still runs under the 12V drive power supply voltage, and the loss of this control circuit is still relatively large.

Images