WO2016078448A1

WO2016078448A1 - Rotation speed adjustment method, apparatus and system for fan

Info

Publication number: WO2016078448A1
Application number: PCT/CN2015/086904
Authority: WO
Inventors: 项巍
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-11-19
Filing date: 2015-08-13
Publication date: 2016-05-26
Also published as: CN105673540A; CN105673540B

Abstract

A rotation speed adjustment system for a fan. The system comprises a main control circuit (12) and a fan drive circuit (14), wherein the main control circuit is coupled and connected to the fan drive circuit and is used for generating a control signal for adjusting a rotation speed of a fan according to a difference value between a current rotation speed of the fan and a pre-determined rotation speed, and the fan drive circuit is used for adjusting the rotation speed of the fan to be in an allowable error range of the pre-determined rotation speed according to the control signal. A rotation speed adjustment method for a fan is applicable to the adjustment system. A rotation speed adjustment apparatus for a fan adopts the adjustment method. The system and method realize flexible adjustment of a rotation speed of a fan board, and improve the efficiency of adjusting the rotation speed of the fan board.

Description

Fan speed adjustment method, device and fan speed adjustment system

Technical field

The present invention relates to the field of communications, and in particular to a method and device for adjusting the rotational speed of a fan and a rotational speed adjusting system for the fan.

Background technique

A fan board is an important board in a communication device. It is of great significance to the heat dissipation of the communication device and the stability of the performance of the service board. The network management system controls the fan speed. It can be divided into two modes: manual control and automatic control. The automatic control scheme basically obtains the temperature of the other slots in the subrack through the agent and then controls the temperature. However, the current method of controlling the fan plate speed is not a closed loop control mode, and the duty ratio of the level is fixed at one level. When the network controller issues a speed control command, the speed of the fan board needs to pass several excessive levels to reach the specified speed. The real-time performance is not good, and the speed regulation process of the fan board is likely to cause oscillation.

Moreover, the control characteristics of modern intelligent devices are mostly non-linear, and the traditional proportional-integral-differential controller (proportion, integration, differentiation, PID) designed by linear control algorithm is often difficult to meet the nonlinear requirements of intelligent instrument control. Not conducive to real-time intelligent control.

In view of the related art, the problem that the rotational speed of the fan plate cannot be flexibly adjusted has not yet provided an effective solution.

Summary of the invention

The invention provides a method for adjusting the rotation speed of a fan, a device and a rotation speed adjustment system of the fan, so as to at least solve the problem that the rotation speed of the fan plate cannot be flexibly adjusted in the related art.

According to an aspect of the present invention, a speed adjustment system for a fan includes: a main control circuit and a fan drive circuit, wherein the main control circuit is coupled to the fan drive circuit for The difference between the rotational speed and the predetermined rotational speed generates a control signal for adjusting the rotational speed of the fan; and the fan driving circuit is configured to adjust the rotational speed of the fan according to the control signal within an allowable error range of the predetermined rotational speed.

Optionally, the main control circuit includes: a speed loop control circuit and a current loop control circuit, wherein the speed loop control circuit is configured to acquire the difference, and generate a current compensation signal according to the difference; The current loop control circuit is configured to obtain a current value flowing through the fan, and generate the control signal according to the current compensation signal and the current value.

Optionally, the speed loop control circuit is a composite fuzzy control circuit, configured to convert the difference into a fuzzy control quantity, and input the fuzzy control quantity in the form of the current compensation signal To the stated Current loop control circuit.

Optionally, the composite fuzzy controller includes: a fuzzy controller and a linear controller, wherein the fuzzy controller is configured to generate a first control amount according to the difference; the linear controller is configured to The difference is linearly operated to a second control amount; wherein the fuzzy control amount is a sum of the first control amount and the second control amount.

Optionally, the fuzzy controller is configured to obtain a deviation accurate value e of the predetermined signal and the feedback signal and a change rate accurate value ec of the deviation according to the difference, wherein the predetermined signal is corresponding to the predetermined rotation speed a signal, the feedback signal is a signal corresponding to the current rotational speed; and multiplying the e and the ec by respective quantizing factors k1, k2, and taking an integer to obtain a fuzzy amount E, Ec; And the Ec, obtaining the blur amount U by a look-up table method; multiplying the obtained U value by the scale factor k3 to obtain the first control amount.

Optionally, the method further includes: a pulse modulation circuit respectively connected to the main control circuit and the fan driving circuit, configured to receive the control signal, and output a pulse width modulation PWM signal generated according to the control signal to The fan drive circuit.

According to another aspect of the present invention, a method for adjusting a rotational speed of a fan includes: obtaining a current rotational speed of the fan; comparing the current rotational speed with a predetermined rotational speed to obtain a difference between the current rotational speed and a predetermined rotational speed; The difference is adjusted to adjust the rotational speed of the fan within an allowable error range of the predetermined rotational speed.

Optionally, adjusting the rotation speed of the fan according to the difference within the allowable error range of the predetermined rotation speed comprises: adjusting a rotation speed of the fan according to the difference value and a feedback current value of the fan.

According to another aspect of the present invention, a speed adjustment device for a fan is provided, including: an acquisition module configured to acquire a current rotational speed of the fan; and a comparison module configured to compare the current rotational speed with a predetermined rotational speed to obtain the current a difference between the rotational speed and the predetermined rotational speed; and an adjustment module configured to adjust the rotational speed of the fan according to the difference within an allowable error range of the predetermined rotational speed.

Optionally, the adjustment module is further configured to adjust a rotation speed of the fan according to the difference value and a feedback current value of the fan.

According to the present invention, a main control circuit and a fan drive circuit are used, wherein the main control circuit is coupled to the fan drive circuit for generating a control signal for adjusting the rotational speed of the fan according to the difference between the current rotational speed of the fan and the predetermined rotational speed; The circuit is configured to adjust the rotation speed of the fan according to the control signal within an allowable error range of the predetermined rotation speed. The invention solves the problem that the speed of the fan board cannot be flexibly adjusted in the related art, thereby realizing the flexible adjustment of the fan board speed and improving the efficiency of adjusting the fan board speed.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a structural diagram of a rotational speed adjustment system of a fan according to an embodiment of the present invention;

2 is a structural diagram 1 of a rotational speed adjusting system of a fan according to an embodiment of the present invention;

3 is a structural diagram 2 of a rotational speed adjusting system of a fan according to an embodiment of the present invention;

4 is a structural diagram 3 of a rotation speed adjustment system of a fan according to an embodiment of the present invention;

FIG. 5 is a flowchart of a method for adjusting a rotational speed of a fan according to an embodiment of the present invention; FIG.

6 is a block diagram showing the structure of a rotational speed adjusting device of a fan according to an embodiment of the present invention;

7 is a block diagram of a fuzzy PI controller system in accordance with an embodiment of the present invention;

8 is a structural diagram of a composite fuzzy controller according to an embodiment of the present invention;

9 is a circuit diagram of a DC motor drive circuit according to an embodiment of the present invention;

Figure 10 is a flow chart showing the main routine of the control system according to an embodiment of the present invention;

11 is a flow chart of a closed loop control of a digital control system in accordance with an embodiment of the present invention.

detailed description

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

In this embodiment, a speed adjustment system for a fan is provided. FIG. 1 is a structural diagram of a speed adjustment system for a fan according to an embodiment of the present invention. As shown in FIG. 1, the system includes: a main control circuit 12 and a fan drive. The circuit 14, wherein the main control circuit 12 is coupled to the fan driving circuit 14 for generating a control signal for adjusting the rotational speed of the fan according to the difference between the current rotational speed of the fan and the predetermined rotational speed; the fan driving circuit 14 is configured to be based on the control signal Adjust the fan speed within the allowable error range of the predetermined speed.

Through the fan speed adjustment system, the main control circuit 12 generates a control signal for adjusting the rotation speed of the fan according to the difference between the current rotation speed of the fan and the predetermined rotation speed, and the fan drive circuit 14 receives the control signal, thereby adjusting the rotation speed of the fan at a predetermined rotation speed. Within the allowable error range. The system solves the problem that the speed of the fan board cannot be flexibly adjusted in the related art, thereby realizing the flexible adjustment of the fan board speed and improving the efficiency of adjusting the fan board speed.

2 is a structural diagram 1 of a rotational speed adjusting system of a fan according to an embodiment of the present invention. As shown in FIG. 2, the main control circuit 12 includes a speed loop control circuit 122 and a current loop control circuit 124, wherein the speed loop control circuit 122 And for generating a difference, and generating a current compensation signal according to the difference; the current loop control circuit 124 is configured to obtain a current value flowing through the fan, and generate a control signal according to the current compensation signal and the current value.

Optionally, the speed loop control circuit 122 may be a composite fuzzy control circuit 126 for converting the difference into a fuzzy control quantity, and inputting the fuzzy control quantity into the current loop control circuit in the form of a current compensation signal. 124.

3 is a structural diagram of a rotational speed adjusting system of a fan according to an embodiment of the present invention. As shown in FIG. 3, the composite fuzzy controller 126 includes: a fuzzy controller 1262 and a linear controller 1264, wherein the fuzzy controller 1262 uses And generating a first control quantity according to the difference; the linear controller 1264 is configured to perform a linear operation on the difference to obtain a second control quantity; wherein the fuzzy control quantity is a sum of the first control quantity and the second control quantity.

Optionally, the fuzzy controller 1262 is configured to obtain a deviation accurate value e of the predetermined signal and the feedback signal and a change rate accurate value ec of the deviation according to the difference, wherein the predetermined signal is a signal corresponding to the predetermined rotational speed, and the feedback signal a signal corresponding to the current rotational speed; and multiplying the e and the ec by respective quantization factors k1 and k2, and taking an integer to obtain the fuzzy quantities E and Ec; according to the E and the Ec, obtaining the fuzzy by a table lookup method The quantity U is obtained by multiplying the obtained U value by the scale factor k3.

4 is a structural diagram 3 of a rotational speed adjusting system of a fan according to an embodiment of the present invention. As shown in FIG. 4, the system further includes: a pulse modulating circuit 16 respectively connected to the main control circuit 12 and the fan driving circuit 14 for A control signal is received, and a pulse width modulated PWM signal generated according to the control signal is output to the fan drive circuit 14.

In this embodiment, a method for adjusting the rotational speed of a fan is provided. FIG. 5 is a flowchart of a method for adjusting the rotational speed of a fan according to an embodiment of the present invention. As shown in FIG. 5, the flow includes the following steps:

Step S502, obtaining a current rotational speed of the fan;

Step S504, comparing the current rotation speed with the predetermined rotation speed, and obtaining a difference between the current rotation speed and the predetermined rotation speed;

Step S506, adjusting the rotation speed of the fan according to the difference within the allowable error range of the predetermined rotation speed.

Through the above steps, the fan can adjust the fan speed according to the difference between the current speed and the predetermined speed, and solve the problem that the speed of the fan board cannot be flexibly adjusted in the related art, thereby realizing the flexible adjustment of the fan board speed and improving Adjust the efficiency of the fan board speed.

In an alternative embodiment, the speed of the fan is adjusted based on the difference and the feedback current value of the fan.

6 is a structural block diagram of a rotational speed adjusting device of a fan according to an embodiment of the present invention. As shown in FIG. 6, the device includes: an acquiring module 62 configured to acquire a current rotational speed of the fan; and a comparing module 64 configured to compare the current rotational speed. And the predetermined rotational speed, the difference between the current rotational speed and the predetermined rotational speed is obtained; and the adjusting module 66 is configured to adjust the rotational speed of the fan according to the difference within the allowable error range of the predetermined rotational speed.

Optionally, the adjustment module 66 is further configured to adjust the rotational speed of the fan according to the difference and the feedback current value of the fan.

In order to solve the above technical problems, the conventional control of the fan board motor at the change of the rotational speed is insufficient, so that the motor of the fan board has good starting characteristics and acceleration characteristics, so that it maintains the set speed. Stable rotation, further reducing the noise of the fan board, improving the stability and service life of the fan board. The optional embodiment provides a fuzzy control method and device for a fan board, including the following contents:

(a) The device includes a fan motor main control circuit (corresponding to the above-described main control circuit 12), a fan motor drive circuit (corresponding to the above-described fan drive circuit 14), and a rotational speed display circuit. The man-machine dialogue function is realized by the host computer software. The fan speed can be displayed in real time to observe the control process and control effects;

(b) The main control circuit calculates the speed error value by comparing the set speed value with the speed feedback value, and outputs a Pulse Width Modulation (PWM) signal of different duty ratios to automatically adjust the speed of the fan motor. Stabilizing the fan motor speed at the initial set value;

(c) The fuzzy control algorithm is introduced in the adjustment of fan motor speed, and the compound fuzzy control device for fan plate motor speed regulation is designed, which greatly improves the control performance. Therefore, the rotation speed of the motor can be automatically adjusted within a prescribed range to keep the rotation speed stable.

The above optional embodiment also has the following features: by adjusting the fuzzy proportional integral controller PI, the starting speed of the motor is fast, and the initial speed setting value can be tracked in a short time.

The implementation method of this alternative embodiment will be further described in detail below with reference to the accompanying drawings:

7 is a block diagram of a fuzzy PI controller system according to an embodiment of the present invention. As shown in FIG. 7, the system of the alternative embodiment adopts a dual closed loop control scheme: the outer loop is a speed loop, and the fuzzy PI algorithm is used to adjust; the inner loop For current loops, use conventional PI conditioning methods. The input of the controller is a given DC voltage signal, a pulse signal, an analog current feedback signal, and the output is a DC voltage control signal, and the motor that drives the actuator is a fan.

Among them, the speed loop adjusts the speed according to the fan motor speed error, so that the system can stably track the speed set value. The output of the speed controller is given as an internal current loop. The inner loop current controller makes the current follow the given speed change in the speed regulation, and obtains the maximum allowable current at the start, and limits the current maximum when the overload occurs. The whole current adjustment process is the change process of the pulse width modulation circuit (PWM) output signal. . By adjusting the duty cycle of the PWM wave to adjust the average value of the winding voltage, the size of the winding current can be indirectly limited and adjusted, and the speed can be adjusted. Since it is necessary to continuously judge the running speed of the fan motor, the signal is fed to the composite fuzzy PI controller as a feedback signal by the quadrature encoder. The current limiting circuit improves the smoothness of the motor torque and ensures the safety of the controller and motor.

8 is a structural diagram of a composite fuzzy controller according to an embodiment of the present invention. FIG. 8 is a design process of a composite fuzzy controller. In order to improve the static accuracy of the system, the error caused by the disturbance is eliminated, and the proportional integral link is added. U2=k/s combines the linear controller and the fuzzy controller to form a composite fuzzy controller. The output of the composite fuzzy controller is the sum of the proportional integral link and the fuzzy controller output.

The current speed of the motor can be measured through the code disc interface, and compared with the initial set speed value, the accurate value e of the deviation of the given signal and the feedback signal in the system and the exact value of the deviation rate of the deviation are obtained as fuzzy The amount of input to the system. In the real-time control, the deviation and the rate of change of the measured value (the output of the speed detection signal compared with the given signal) are multiplied by the corresponding quantization factors k1 and k2, and the integers are obtained to obtain the fuzzy quantities E and Ec. And the Ec value, the fuzzy control decision table is used to find the fuzzy quantity U. In the look-up table method, only the two steps of performing quantization and table lookup on the input quantity can obtain the control value, which is simple and convenient, and has excellent real-time. Sex. Then multiply the obtained U value by the scale factor k3 to obtain the basic fuzzy control quantity exact value u1. The proportional and integral operations are used to determine the control amount from the deviation of the velocity U2, so the composite controller outputs u=u1+u2, and then u passes through the current regulator and sends it to the motor drive circuit to drive the fan motor to rotate.

The fan board motor drive circuit is mainly to drive the fan motor to achieve forward and reverse rotation at a certain speed as required. FIG. 9 is a circuit diagram of a DC motor driving circuit according to an embodiment of the present invention. As shown in FIG. 9, the driving circuit of the motor is composed of two driving chips IR2110 and four MOSFETs IRF540. Four IRF540s form a full bridge drive circuit. Among them, C24 and C25 are bootstrap capacitors, D6 and D11 are bootstrap diodes, and C26 and C27 are filter capacitors. When the HIN pin of U4 (IR2110) is high, and it is assumed that during the Q1 turn-off period, the bootstrap capacitor C24 has been charged to a sufficient voltage (its voltage is approximately equal to +15V), pin 7 (HO) and pin The insulated gate FET VM1 inside 6 (VB) is turned on, the FET VM2 between pin 7 (HO) and pin 5 (VS) is turned off, and the voltage of VC24 is applied to the gate and emitter of Q1. Between, C24 discharges through capacitor Cgc1 between VM1, R23 and Q1 gate and gate, Cgc1 is charged, and Q1 is turned on. At this time, VC24 can be equivalent to a voltage source. At the same time, the HIN pin of U5 (IR2110) is low, the FET VM2 between pin 7 (HO) and pin 5 (VS) is turned on, pin 7 (HO) and pin 6 (VB) Between the FET VM1 is turned off, the gate charge of Q2 passes through R29, VM2 is quickly released, and Q2 is turned off. At this time, the LIN pin of U5 is high level, Q4 is turned on, +15V is charged by VD11, Q4 is charged to C25, and energy is quickly added to C25. Q1 and Q4 are simultaneously turned on, and the output voltage makes the motor achieve forward rotation. When Q2 and Q3 are turned on, the motor is reversed. Reasonable set dead time, avoiding the bridge arm through, short circuit, MOSFET is broken down. R24, R25, R26, and R27 are voltage divider resistors to avoid overheating of the MOSFET due to excessive circuit current.

The main program flow chart of the optional embodiment is specifically described below. FIG. 10 is a flowchart of the main program of the control system according to the embodiment of the present invention. As shown in FIG. 10, the process flow includes the following steps: the main program of the controller completes initialization. Check to see if it needs to be enabled. If it is enabled, enter the program for setting the speed. When the speed is set, the speed adjustment subroutine is executed and the fan board motor speed is displayed in real time.

11 is a flow chart of a closed loop control of a digital control system according to an embodiment of the present invention, wherein a flowchart of a speed adjustment subroutine, as shown in FIG. 11, the controller initializes the MCPWM QEI and the port to check whether the speed setting is performed, if not set. The fixed speed is set first. If the fan speed setting has been completed, the current fan motor speed is read, and the set value and the fan motor speed value are sent to the composite fuzzy controller through the speed error value. Judgment and adjustment, the fan motor speed is tracked to the initial speed set value, and finally a PWM signal is generated to drive the fan motor to stabilize its speed at the initial speed setting.

In summary, the present invention solves the problem that the rotational speed of the fan plate cannot be flexibly adjusted in the related art, thereby achieving flexible adjustment of the rotational speed of the fan plate and improving the efficiency of adjusting the rotational speed of the fan plate.

In another embodiment, software is also provided for performing the technical solutions described in the above embodiments and preferred embodiments.

In another embodiment, a storage medium is further provided, wherein the software includes the above-mentioned software, including but not limited to: an optical disk, a floppy disk, a hard disk, an erasable memory, and the like.

It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

The invention relates to the field of communication, and provides a method and device for adjusting the rotation speed of a fan and a rotation speed adjustment system of the fan, wherein the system comprises a main control circuit and a fan drive circuit, wherein the main control circuit is coupled with the fan drive circuit, And a control signal for adjusting a rotation speed of the fan according to a difference between a current rotation speed of the fan and a predetermined rotation speed; and a fan driving circuit configured to adjust the rotation speed of the fan according to the control signal within an allowable error range of the predetermined rotation speed. The invention solves the problem that the rotation speed of the fan board cannot be flexibly adjusted in the related art, thereby realizing the flexible adjustment of the rotation speed of the fan board and improving the efficiency of adjusting the rotation speed of the fan board.

Claims

A fan speed adjustment system includes: a main control circuit and a fan drive circuit, wherein

The main control circuit is coupled to the fan driving circuit, and configured to generate a control signal for adjusting a rotation speed of the fan according to a difference between a current rotation speed of the fan and a predetermined rotation speed;

The fan driving circuit is configured to adjust a rotation speed of the fan according to the control signal within an allowable error range of the predetermined rotation speed.
The system of claim 1 wherein said master control circuit comprises: a speed loop control circuit and a current loop control circuit, wherein

The speed loop control circuit is configured to acquire the difference and generate a current compensation signal according to the difference;

The current loop control circuit is configured to acquire a current value flowing through the fan, and generate the control signal according to the current compensation signal and the current value.
The system of claim 2 wherein

The speed loop control circuit is a composite fuzzy control circuit for converting the difference into a fuzzy control amount, and inputting the fuzzy control amount to the current in the form of the current compensation signal Loop control circuit.
The system of claim 3, wherein the composite fuzzy controller comprises: a fuzzy controller and a linear controller, wherein

The fuzzy controller is configured to generate a first control amount according to the difference value;

The linear controller is configured to perform a linear operation on the difference to obtain a second control amount;

The fuzzy control amount is a sum of the first control amount and the second control amount.
The system according to claim 4, wherein said fuzzy controller is configured to derive a deviation accurate value e of the predetermined signal and the feedback signal and a rate of change accurate value ec of the deviation based on said difference, wherein said predetermined signal For the signal corresponding to the predetermined rotational speed, the feedback signal is a signal corresponding to the current rotational speed; and multiplying the e and the ec by respective quantization factors k1 and k2, and taking an integer to obtain a fuzzy amount E And Ec; obtaining the blur quantity U by a look-up table method according to the E and the Ec; multiplying the obtained U value by the scale factor k3 to obtain the first control quantity.
A system according to any one of claims 1 to 5, further comprising:

And a pulse modulation circuit respectively connected to the main control circuit and the fan drive circuit for receiving the control signal, and outputting a pulse width modulation PWM signal generated according to the control signal to the fan drive circuit.
A method for adjusting a rotational speed of a fan, comprising:

Get the current speed of the fan;

Comparing the current rotational speed with a predetermined rotational speed to obtain a difference between the current rotational speed and a predetermined rotational speed;

Adjusting the rotation speed of the fan according to the difference is within an allowable error range of the predetermined rotation speed.
The method according to claim 7, wherein adjusting the rotation speed of the fan according to the difference within the allowable error range of the predetermined rotation speed comprises:

Adjusting the rotational speed of the fan according to the difference and the feedback current value of the fan.
A fan speed adjusting device includes:

Obtaining a module, configured to obtain a current speed of the fan;

Comparing a module, configured to compare the current rotational speed with a predetermined rotational speed to obtain a difference between the current rotational speed and a predetermined rotational speed;

And an adjustment module configured to adjust the rotation speed of the fan according to the difference within an allowable error range of the predetermined rotation speed.
The apparatus of claim 9, wherein the adjustment module is further configured to adjust a rotational speed of the fan based on the difference and a feedback current value of the fan.