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Linear compensation method of rotating speed of fan

A fan speed and compensation method technology, applied in the field of speed compensation, can solve the problems of increased component costs, unstable fan speed, and different fan motor characteristics, and achieve cost savings, stable fan speed, and easy specifications

Active Publication Date: 2012-01-11
陞达科技股份有限公司
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Problems solved by technology

[0004] 1. The curve of the fan speed corresponding to the PWM duty cycle is an upward throwing curve, so it is easy to cause the fan speed to be unstable
[0005] 2. If the control curve of the open loop (that is, the curve of the fan speed and the PWM duty cycle) is designed to be linear, an additional circuit is required to achieve it, so it is easy to increase the cost of parts
[0006] 3. The characteristics of each fan motor are different, so the specification of the fan speed is not easy to formulate

Method used

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  • Linear compensation method of rotating speed of fan
  • Linear compensation method of rotating speed of fan
  • Linear compensation method of rotating speed of fan

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Embodiment Construction

[0021] The above and other technical features and advantages of the present invention will be described in more detail below in conjunction with the accompanying drawings.

[0022] Such as image 3 , Figure 4 , Figure 5 As shown, the present invention provides a fan speed linear compensation method. In a preferred embodiment of the present invention, the method includes the following steps:

[0023] Step 300: start;

[0024] Step 301: An Integrated Circuit (IC) reads a PulseWidth Modulation (PWM) signal to perform compensation calculation to obtain a compensation signal;

[0025] Step 302: Subtracting or adding a compensation value to the compensation signal, the compensated pulse width modulation signal can be obtained as downward throw curve A2;

[0026] Step 303: The control chip controls the speed of a fan according to the compensated PWM signal, so that the speed curve of the fan is straight and linear after compensation.

[0027] Step 304: end.

[0028] To sum up...

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Abstract

The invention provides a linear compensation method of rotating speed of a fan, which comprises the following steps: reading a pulse-width signal through a control chip for compensation and calculation to obtain a compensation signal; reducing or increasing the compensation signal by a compensation value to obtain a compensated pulse-width signal, wherein the curve shown by the compensated pulse-width signal is a lower parabola; and controlling the rotating speed of the fan by the control chip according to the compensated pulse-width signal so as to lead the rotating speed curve of the fan tobe a straight line and be linear after being compensated. The method reduces the cost, can achieve stable rotating speed of the fan, and can easily set the specification of the rotating speed of the fan.

Description

technical field [0001] The invention relates to a speed compensation method, in particular to a fan speed linear compensation method. Background technique [0002] Due to the high speed and complexity of electronic components, the electronic components will generate considerable heat when they are working. Therefore, on many electronic components or in their working environment, it is necessary to install a cooling fan to effectively cool the electronic components and make them works fine. When it is used in computers, graphics cards or notebook computers nowadays, the general focus is on the speed control of cooling fans and other issues. In terms of controlling the operation mode of the cooling fan, in addition to fully open and fully closed (ON / OFF), the pulse width modulation (Pulse Width Modulation, referred to as PWM) is mainly used to control the operation of the fan, and the adjustment is made in each unit time. The difference in duty cycle to control the fan speed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D27/00H02P7/00H02P29/00
Inventor 林招庆祝林林有康
Owner 陞达科技股份有限公司
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