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Control method and circuit for multistage temperature-controlled fan

A control method and control circuit technology, which are applied in the direction of using electric mode for temperature control, adaptive control, general control system, etc. The effect of electrical optimization

Inactive Publication Date: 2004-06-23
LENOVO (BEIJING) LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The problem solved by the present invention is to avoid the temperature control state of the system being uncertain at a certain operating temperature due to the independent temperature control of the fans in the electronic device, and the optimal state of heat dissipation, power consumption, and noise cannot be achieved.

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  • Control method and circuit for multistage temperature-controlled fan
  • Control method and circuit for multistage temperature-controlled fan
  • Control method and circuit for multistage temperature-controlled fan

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Embodiment Construction

[0026] The present invention takes the minimum noise value as the initial state, uses a selected full-control fan to realize unified control of all fans, and starts the temperature control of the fans in a predetermined order, so that the temperature control of only one fan is turned on in the same period of time, and the other The fan maintains a constant speed. In this way, any moment of the present invention is a definite control state.

[0027] Among them, the fully-controlled fan is generally the largest noise source, while the other fans are semi-controlled fans; the predetermined order is generally in accordance with the order of the influence of the temperature-controlled fans on the noise from small to large, and the order of the temperature of the temperature section from low to high. Arrangement, the principle is that each temperature segment corresponds to the temperature control of only one fan. For example: if the temperature range is (1)fan 2>fan 3>fan 4, then ...

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Abstract

The present invention is control method and circuit for multistage temperature-controlled fan. The control method includes selecting the minimum noise state as the initial state; and adopting selected fan reference temperature to control the on and off of all the fan temperature control so that every fan is temperature controlled based corresponding temperature stage and only one fan is temperature controlled in any temperature stage to obtain determined control state. The control circuit for realizing the control method includes one sensor to sense the reference temperature of the selected fan to produce PWM control signal; one control chip connected to the sensor to produce multiplex control signal based on the PWM control signal; several temperature controlled fans with temperature control initiated in set order based on the logic combination of multiplex control signal. The control scheme may be used for electronic equipment needing heat dissipation to reach optimized heat dissipation, noise and power consumption.

Description

technical field [0001] The present invention relates to a control method and circuit of a cooling device, in particular to a control method and circuit of a multi-stage temperature-controlled fan in an electronic device system. Background technique [0002] General equipment generates heat during operation, especially high-speed electronic devices such as desktop computers and portable electronic devices. In order to prevent various problems caused by overheating, such as shortened life of components or malfunctions, etc., general electronic devices are equipped with some heat dissipation devices to reduce the temperature during operation. [0003] Because fans have the characteristics of small size and good heat dissipation effect, computers, especially portable electronic devices, usually use fans to dissipate heat. [0004] At present, most fans used for heat dissipation are usually controlled by constant voltage, that is, the fan is in two states of on and off, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/00G05D23/19
Inventor 刘晓松李波张义慧
Owner LENOVO (BEIJING) LTD
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