TW201635692A - Method for preventing a fan from burning down at activation - Google Patents

Abstract

A method for preventing a fan from burning down at activation includes steps of: using a central processing unit to detect rotational speed of forward operation of a fan impeller of the fan and defining the rotational speed as a highest backward rotational speed value; using the central processing unit to detect operation direction of the fan impeller of the fan and rotational speed of backward operation of the fan impeller; using the central processing unit to activate the fan impeller to operate forward when the fan impeller is blown and moved by return air to rotate forward; and using the central processing unit to activate a rotation stop control signal to stop the fan impeller when the fan impeller is blown and moved by the return air to rotate backward, if the rotational speed of the rotation stop control signal is smaller than the highest backward rotational speed value, the central processing unit activating the fan to operate forward, if the rotational speed of the rotation stop control signal is larger than the highest backward rotational speed value, the central processing unit making the fan generate a warning signal and keeping providing the rotation stop control signal. The method can prevent the fan from burning down when operating forward and enhance the stability of forward operation of the fan.

Description

Method for preventing fan from starting to run and burning

The invention relates to a method for starting a fan operation, in particular to a method for preventing a fan from being burned in a forward operation and improving a forward operation stability of the fan.

With the advancement of technology, people's dependence on various electronic devices has also increased; however, in order to meet the considerations of portability and practicability, the current electronic products on the market tend to be light, thin, and functional. More and more processing speed as the main axis of the design, so that the products can be more in line with the needs of modern society, and in order to meet the consideration of portability and practicality, currently on the market electronic products (such as computers, notebook computers) In terms of design, it tends to be a short, light, short, functional, and processing speed as the main axis of the design, so that the products can be more in line with the needs of modern society.

However, when the cooling fan is not energized, the fan blade of the cooling fan is in a stationary state, and when the fan of the cooling fan blows back the blade in the opposite direction, the blade of the cooling fan rotates in the opposite direction. When the heat-dissipating fan is to be driven in the forward direction, after detecting that the blade is rotating in the opposite direction, the brake speed is first stopped to stop the reverse rotation of the fan or reduce the reverse rotation speed, but The braking speed provided by the cooling fan increases as the amount of return air becomes larger, and the higher the braking speed is, the larger the load of the cooling fan is. When the cooling fan is energized and is in forward running, the conduction is turned on. The positive voltage is likely to exceed the operating speed specification due to excessive braking speed, which may cause the cooling fan to burn out or affect the stability of the cooling fan.

Therefore, in order to effectively solve the above problems, the main object of the present invention is to provide a method for preventing the fan from starting to burn and preventing the fan from being burned in the forward direction and improving the forward running stability of the fan.

A secondary object of the present invention is to provide a method for actively providing an alarm signal to prevent the fan from starting to burn when the fan is started to burn.

To achieve the above object, the present invention provides a method for synchronizing a fan speed, which includes the steps of:

Detecting the forward running speed of the blade through a central processing unit and defining a rotational speed as a reverse maximum rotational speed value;

And detecting, by the central processing unit, a fan blade running direction of the fan and a rotation speed of the fan blade in reverse operation;

When the fan blade is blown forward by the return air, the central processing unit starts the fan to run forward;

When the fan blade is reversed by the return air, the central processing unit starts a stop rotation control signal to stop the fan, and if the rotation speed of the stop rotation control signal is less than the reverse maximum rotation speed value, the central processing unit The fan is started to run forward. If the rotation speed of the stop rotation control signal is greater than the reverse maximum rotation speed value, the central processing unit causes the fan to generate an alarm signal and continuously provide the stop rotation control signal.

With the design of the method of the present invention, the effect of the fan running forward burning and improving the forward running stability of the fan can be effectively avoided.

1‧‧‧Fan board

2‧‧‧Central Processing Unit

3‧‧‧ Hall sensor

4‧‧‧Optical unit

41‧‧‧Transistor bridge

42‧‧‧Transistor lower bridge

5‧‧‧ coil

Figure 1 is a flow chart showing the steps of a preferred embodiment of the present invention;

Figure 2 is a schematic diagram of a circuit in accordance with a preferred embodiment of the present invention.

The above object of the present invention, as well as its structural and functional features, will be described in accordance with the preferred embodiments of the drawings.

Referring to FIG. 1 and FIG. 2 , it is a flow chart and a circuit diagram of a preferred embodiment of the method for preventing a fan from being burned and burned according to the present invention. As shown in the figure, a method for preventing a fan from being started and burned is shown. Including steps:

Step S1, detecting, by a central processing unit 2, the rotational speed of the fan in the forward running direction and defining the rotational speed as a reverse maximum rotational speed value;

The fan is mainly provided with a fan circuit board 1 , and the central processing unit 2 is mainly disposed on the fan circuit board 1 , and the fan circuit board 1 is further provided with at least one Hall sensor 3 and at least one The transistor unit 4 and the at least one coil 5, and the fan system thereof may be a single-phase fan or a three-phase fan. In this embodiment, a three-phase fan is used as an embodiment, and the central processing unit 2 is a microcontroller or a motor driving IC, and the transistor unit 4 includes a transistor upper bridge 41 and a transistor lower bridge 42, and the central processing unit 2 detects the upper limit of the rotational speed of the forward running when the fan is running in the forward direction, and The rotational speed is defined as a reverse maximum rotational speed value, wherein the reverse maximum rotational speed value is an upper limit value of the rotational speed of the forward running of the blade;

Step S2, and detecting, by the central processing unit 2, a fan blade running direction of the fan and a rotation speed of the fan blade in reverse operation;

Before the fan is energized, the central processing unit 2 determines the fan blade running direction via the signal of the Hall sensor 3, and detects the rotation speed according to the running direction thereof, and the fan is blown back by the wind. When moving, the blade is in reverse operation, and its central processing unit 2 detects that its blade is in reverse operation and detects its reverse speed according to its reverse operation.

Step S3, when the fan blade is blown forward by the return air, the central processing unit 2 starts the forward running of the fan;

The central processing unit 2 detects the fan blade running direction of the fan, and the central processing unit 2 detects that the fan is positively rotated by the return air, and the central processing unit 2 turns on the transistor upper bridge 41. Turn on the power and start the fan to run forward.

Step S4, when the blade is blown back by the return air, the central processing unit 2 starts a stop rotation control signal to stop the fan;

The central processing unit 2 detects the fan blade running direction of the fan, and the central processing unit 2 detects that the fan is reversed by the return air, and the central processing unit 2 does not turn on the power and starts one. Stopping the rotation control signal stops the rotation of the fan reverse rotation.

Step S41, if the rotation speed of the stop rotation control signal is less than the reverse maximum rotation speed value, the central processing unit 2 starts the fan forward operation;

If the central processing unit 2 detects that the rotation speed of the stop rotation control signal is less than the reverse maximum rotation speed value, the central processing unit 2 turns on the transistor upper bridge 41 to turn on the power and starts the fan forward operation.

Step S42, if the rotation speed of the stop rotation control signal is greater than the reverse maximum rotation speed value, the central processing unit 2 causes the fan to generate an alarm signal and continuously provide the stop rotation control signal.

If the central processing unit 2 detects that the rotation speed of the stop rotation control signal is greater than the reverse maximum rotation speed value, the central processing unit 2 turns off the transistor upper bridge 41, and turns on the transistor lower bridge 42 to stop rotating. a fan blade, and the central processing unit 2 causes the fan to generate an alarm signal and continuously provide the stop rotation control signal, and the central processing unit 2 does not start the fan forward operation, and the central processing unit 2 continuously compares The rotation speed of the rotation control signal and the reverse maximum rotation speed are stopped.

Thereby, the fan is detected to be forward or reverse by the method of preventing the fan from starting and burning, and if the fan is running in the forward direction when the forward rotation is performed, if the rotation is reversed, the rotation speed of the control signal is stopped first. And the reverse maximum speed value, and then control its fan forward operation or generate an alarm signal notification, can achieve the effect of avoiding the fan forward running burn and improving the fan forward operation stability.

The above description is only a preferred embodiment of the present invention, but the features of the present invention are not limited thereto, and any changes or modifications that can be easily conceived in the field of the present invention are known to those skilled in the art. It is intended to be included in the scope of the claims of the present invention below.

Claims (9)

[Item 1] A method for preventing a fan from starting to burn, comprising the steps of:
Detecting the forward running speed of the blade through a central processing unit and defining a rotational speed as a reverse maximum rotational speed value;
And detecting, by the central processing unit, a fan blade running direction of the fan and a rotation speed of the fan blade in reverse operation;
When the fan blade is blown forward by the return air, the central processing unit starts the forward operation of the blade;
When the blade is blown back by the return air, the central processing unit starts a stop rotation control signal to stop the blade, and if the rotation speed of the stop rotation control signal is less than the reverse maximum rotation speed value, the central processing The unit starts the fan to run in the forward direction. If the rotation speed of the stop rotation control signal is greater than the reverse maximum rotation speed value, the central processing unit causes the fan to generate an alarm signal and continuously provide the stop rotation control signal. [Item 2] The method for preventing a fan from starting to burn according to the first aspect of the invention, wherein the central processing unit continuously compares the stop rotation when the central processing unit causes the fan to generate the alarm signal and continuously provides a stop rotation control signal. The rotational speed of the control signal and the reverse maximum rotational speed. [Item 3] The method for preventing a fan starting operation from burning according to the first aspect of the invention, wherein the central processing unit is a microcontroller or a motor driving IC. [Item 4] The method for preventing a fan from starting to burn according to the first aspect of the invention, wherein an upper limit value of the rotational speed of the blade forward operation is defined as the reverse maximum rotational speed value. [Item 5] The method for preventing a fan from starting to burn according to the first aspect of the invention, wherein the central processing unit is disposed on a fan circuit board, and the fan circuit board is further provided with at least one Hall sensor and at least one a transistor unit and at least one coil. [Item 6] The method for preventing a fan from starting to burn according to the fifth aspect of the invention, wherein the central processing unit determines whether the blade is rotating forward or reversed via a signal of the Hall sensor. [Item 7] The method for preventing a fan from starting to burn according to the sixth aspect of the invention, wherein the transistor unit comprises a transistor upper bridge and a transistor lower bridge, and the central processing unit uses the transistor upper bridge to turn on Its blades are moving forward. [Item 8] The method for preventing a fan from starting to burn according to the seventh aspect of the invention, wherein the central processing unit cuts off the upper bridge of the transistor, and turns on the lower bridge of the transistor to stop rotating the blade. [Item 9] The method for preventing a fan starting operation from burning according to claim 8, wherein the central processing unit causes the fan to generate an alarm signal and continuously provide the stop rotation control signal when the reverse rotation control signal is greater than the reverse maximum rotation speed value. The rotation control signal is stopped, and the central processing unit does not activate the fan to operate in the forward direction.