TWI552504B - Method for preventing a fan from burning down at activation - Google Patents

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 easy to exceed the operating speed specification due to the excessive speed of the brake, which may cause the cooling fan to burn out or affect the stability of the cooling fan. The problem.

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.

In order to achieve the above object, the present invention provides a method for synchronizing a fan speed, comprising the steps of: detecting, by a central processing unit, an upper limit value of a rotational speed of at least one blade forward starting operation and defining an upper limit value of the rotational speed thereof. a reverse maximum speed value; and detecting, by the central processing unit, a fan blade running direction and a rotational speed of the fan in reverse operation; and the blade is centrally processed when the blade is blown forward by the return air The unit starts the fan to run forward; when the blade is reversed by the return air, the central processing unit starts a stop rotation control signal to stop the fan, if the blade is under the control of the stop rotation control signal When the rotation speed in the reverse operation is less than the reverse maximum rotation speed value, the central processing unit starts the forward operation of the fan, and if the blade rotates under the control of the stop rotation control signal, the rotation speed is greater than When the reverse maximum speed value is described, its 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

1 is a flow chart of a preferred embodiment of the present invention; and FIG. 2 is a circuit diagram of 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. The method includes the following steps: Step S1: detecting, by a central processing unit 2, an upper limit value of a rotational speed of at least one blade forward starting operation and defining an upper limit value of the rotational speed thereof as a reverse maximum rotational speed value; wherein the fan mainly has a fan circuit board 1 , 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 transistor unit 4 and at least a 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 drive IC. 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 in the forward starting operation, and defines the rotational speed as one. Reverse maximum speed The reverse maximum speed value is an upper limit value of the rotational speed of the fan in the forward direction; and in step S2, the central processing unit 2 detects the fan blade running direction and the fan blade The rotational speed of the motor is operated; the central processing unit 2 determines the direction of operation of the blade via the signal of the Hall sensor 3, and detects the rotational speed according to the running direction thereof before the fan is energized. And its fan is When the return air blows, its 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.

In 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; wherein the central processing unit 2 detects the fan blade running direction of the fan, and the central processing thereof When the unit 2 detects that its fan is blown by the return air, its central processing unit 2 turns on its transistor upper bridge 41 to turn on the power and starts the fan to run forward.

In step S4, when the blade is reversed by the return air, the central processing unit 2 starts a stop rotation control signal to stop the fan; wherein the central processing unit 2 detects the fan blade running direction of the fan, and When the central processing unit 2 detects that the fan is reversed by the return air, the central processing unit 2 does not turn on the power first and activates a stop rotation control signal to stop the rotation of the fan reverse rotation.

Step S41, if the rotation speed of the blade in the reverse operation under the control of the stop rotation control signal is less than the reverse maximum rotation speed value, the central processing unit 2 starts the forward operation of the fan; The unit 2 detects that the fan blade rotates under the control of the stop rotation control signal, and the rotation speed of the reverse operation is less than the reverse maximum speed value, and the central processing unit 2 turns on the transistor upper bridge 41 to turn on the power and start. The fan is running forward.

Step S42, if the rotation speed of the blade in the reverse operation under the control 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 rotation control signal is stopped.

Wherein, if the central processing unit 2 detects that the rotational speed of the blade in the reverse operation under the control of the stop rotation control signal is greater than the reverse maximum rotational speed value, the central processing unit 2 cuts off its The upper bridge 41 of the transistor is connected to the lower bridge 42 of the transistor to stop rotating its 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 The fan is not started to run forward, and the central processing unit 2 continuously compares the rotational speed of the blade with the reverse maximum rotational speed under the control of the stop rotation control signal.

Thereby, the fan is detected to be forward or reverse by the method of preventing the fan from starting to burn, and if the fan is running in the forward direction when the forward rotation is performed, if the blade is reversed, the blade is first determined to stop rotating. Under the control of the control signal, the speed of the reverse operation and the value of the reverse maximum speed value, thereby controlling the forward running of the fan or generating an alarm signal notification, can avoid the fan running forward burning and improve the forward running stability of the fan. The effect of the person.

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 (8)

A method for preventing a fan from starting to burn, comprising the steps of: detecting, by a central processing unit, an upper limit value of a rotational speed of at least one blade forward starting operation and defining an upper limit value of the rotational speed as a reverse maximum rotational speed value, And detecting, by the central processing unit, a fan blade running direction and a rotation speed of the fan in reverse operation; when the blade is rotated by the return air, the central processing unit starts the blade positive When the fan blade is reversed by the return air, the central processing unit starts a stop rotation control signal to stop the blade, and if the blade is reversely operated under the control of the stop rotation control signal When the rotational speed is less than the reverse maximum rotational speed value, the central processing unit starts the forward running of the fan, and if the blade is under the control of the stop rotation control signal, the rotational speed is greater than the reverse maximum At the speed value, its central processing unit causes the fan to generate an alarm signal and continuously provide the stop rotation control signal. 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 blades thereof when the central processing unit causes the fan to generate the alarm signal and continuously provides a stop rotation control signal. The rotational speed at the time of the reverse operation and the reverse maximum rotational speed value under the control of the stop rotation control signal. 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. 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. The method for preventing a fan from starting to burn according to the fourth aspect of the invention, wherein the central processing unit determines, by the signal of the Hall sensor, that the blade is rotated forward or reverse. The method for preventing a fan from starting to burn according to the fifth 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. The method for preventing a fan from starting to burn according to the sixth 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. The method for preventing a fan from starting to burn according to the seventh aspect of the invention, wherein the central processing unit causes the fan to generate an alarm signal when the reverse speed is greater than the reverse maximum speed value. The stop rotation control signal is continuously provided, and the central processing unit does not initiate the fan forward operation.